kubeadm中如何部署kubernetes集群，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
这里使用RHEL7.5
master、etcd：192.168.10.101，主机名：master
node1：192.168.10.103，主机名：node1
node2：192.168.10.104，主机名：node2
所有机子能基于主机名通信，编辑每台机子的/etc/hosts文件：
192.168.10.101 master
192.168.10.103 node1
192.168.10.104 node2
所有机子时间要同步
所有机子关闭防火墙和selinux。
master可以免密登录全部机子。
【重要问题】
集群初始化以及节点加入集群的时候都会从谷歌仓库下载镜像，然而，我们并不能访问到谷歌，所以无法下载所需的镜像。而我已经将所需镜像上传至阿里云个人仓库。
1、etcd cluster，仅master节点；
2、flannel，集群的所有节点；
3、配置k8s的master：仅master节点；
kubernetes-master
启动的服务：kube-apiserver，kube-scheduler，kube-controller-manager
4、配置k8s的各Node节点；
kubernetes-node
先设定启动docker服务；
启动的k8s的服务：kube-proxy，kubelet
kubeadm
1、master，nodes：安装kubelet，kubeadm，docker
2、master：kubeadm init
3、nodes：kubeadm join
https://github.com/kubernetes/kubeadm/blob/master/docs/design/design_v1.10.md
（1）yum源配置
这里使用1.12.0版本。下载地址:https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.12.md#downloads-for-v1120
这里使用yum下载。配置yum源，先配置docker的yum源，直接下载阿里云的repo文件即可：
[root@master ~]# curl -o /etc/yum.repos.d/docker-ce.repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
创建kubernetes的yum源文件：
[root@master ~]# vim /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes Repo baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/ gpgcheck=1 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg enabled=1
将这两个repo文件复制到其他节点的/etc/yum.repo.d目录中：
[root@master ~]# for i in 102 103; do scp /etc/yum.repos.d/{docker-ce.repo,kubernetes.repo} root@192.168.10.$i:/etc/yum.repos.d/; done安装yum源的检验key:
[root@master ~]# ansible all -m shell -a "curl -O https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg && rpm --import rpm-package-key.gpg"
（2）安装docker、kubelet、kubeadm、kubectl
[root@master ~]# yum install docker-ce kubelet kubeadm kubectl -y
（3）修改防火墙
[root@master ~]# echo 1 > /proc/sys/net/bridge/bridge-nf-call-ip6tables [root@master ~]# echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables [root@master ~]# ansible all -m shell -a "iptables -P FORWARD ACCEPT"
注意：这是临时修改，重启机器参数会失效。
永久修改：/usr/lib/sysctl.d/00-system.conf
（4）修改docker服务文件并启动docker
[root@master ~]# vim /usr/lib/systemd/system/docker.service [Service] Type=notify # the default is not to use systemd for cgroups because the delegate issues still # exists and systemd currently does not support the cgroup feature set required # for containers run by docker #Environment="HTTPS_PROXY=http://www.ik8s.io:10080" Environment="NO_PROXY=127.0.0.1/8,127.0.0.1/16"
在Service段中添加：
Environment="NO_PROXY=127.0.0.1/8,127.0.0.1/16"
启动docker:
[root@master ~]# systemctl daemon-reload [root@master ~]# systemctl start docker [root@master ~]# systemctl enable docker
（5）设置kubelet开机启动
[root@master ~]# systemctl enable kubelet
（6）初始化
编辑配置文件，忽略某些参数：
[root@master ~]# vim /etc/sysconfig/kubelet KUBELET_EXTRA_ARGS="--fail-swap-on=false"
执行初始化：
[root@master ~]# kubeadm init --kubernetes-version=v1.12.0 --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --ignore-preflight-errors=Swap [init] using Kubernetes version: v1.12.0 [preflight] running pre-flight checks [WARNING Swap]: running with swap on is not supported. Please disable swap [preflight/images] Pulling images required for setting up a Kubernetes cluster [preflight/images] This might take a minute or two, depending on the speed of your internet connection [preflight/images] You can also perform this action in beforehand using 'kubeadm config images pull' [preflight] Some fatal errors occurred: [ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-apiserver:v1.12.0: output: Error response from daemon: Get https://k8s.gcr.io/v2/: proxyconnect tcp: dial tcp 172.96.236.117:10080: connect: connection refused , error: exit status 1 [ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-controller-manager:v1.12.0: output: Error response from daemon: Get https://k8s.gcr.io/v2/: proxyconnect tcp: dial tcp 172.96.236.117:10080: connect: connection refused , error: exit status 1 [ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-scheduler:v1.12.0: output: Error response from daemon: Get https://k8s.gcr.io/v2/: proxyconnect tcp: dial tcp 172.96.236.117:10080: connect: connection refused , error: exit status 1 [ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-proxy:v1.12.0: output: Error response from daemon: Get https://k8s.gcr.io/v2/: proxyconnect tcp: dial tcp 172.96.236.117:10080: connect: connection refused , error: exit status 1 [ERROR ImagePull]: failed to pull image k8s.gcr.io/pause:3.1: output: Error response from daemon: Get https://k8s.gcr.io/v2/: proxyconnect tcp: dial tcp 172.96.236.117:10080: connect: connection refused , error: exit status 1 [ERROR ImagePull]: failed to pull image k8s.gcr.io/etcd:3.2.24: output: Error response from daemon: Get https://k8s.gcr.io/v2/: proxyconnect tcp: dial tcp 172.96.236.117:10080: connect: connection refused , error: exit status 1 [ERROR ImagePull]: failed to pull image k8s.gcr.io/coredns:1.2.2: output: Error response from daemon: Get https://k8s.gcr.io/v2/: proxyconnect tcp: dial tcp 172.96.236.117:10080: connect: connection refused , error: exit status 1 [preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...` [root@master ~]#
无法下载镜像。因为无法访问谷歌镜像仓库。可以通过其他途径下载镜像到本地，再执行初始化。
镜像下载脚本：https://github.com/yanyuzm/k8s_images_script
相关镜像我已上传到阿里云，执行以下脚本即可：
[root@master ~]# vim pull-images.sh
#!/bin/bash
images=(kube-apiserver:v1.12.0 kube-controller-manager:v1.12.0 kube-scheduler:v1.12.0 kube-proxy:v1.12.0 pause:3.1 etcd:3.2.24 coredns:1.2.2)
for ima in ${images[@]}
do
docker pull registry.cn-shenzhen.aliyuncs.com/lurenjia/$ima
docker tag registry.cn-shenzhen.aliyuncs.com/lurenjia/$ima k8s.gcr.io/$ima
docker rmi -f registry.cn-shenzhen.aliyuncs.com/lurenjia/$ima
done
[root@master ~]# sh pull-images.sh用到的镜像有：
[root@master ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE k8s.gcr.io/kube-controller-manager v1.12.0 07e068033cf2 2 weeks ago 164MB k8s.gcr.io/kube-apiserver v1.12.0 ab60b017e34f 2 weeks ago 194MB k8s.gcr.io/kube-scheduler v1.12.0 5a1527e735da 2 weeks ago 58.3MB k8s.gcr.io/kube-proxy v1.12.0 9c3a9d3f09a0 2 weeks ago 96.6MB k8s.gcr.io/etcd 3.2.24 3cab8e1b9802 3 weeks ago 220MB k8s.gcr.io/coredns 1.2.2 367cdc8433a4 6 weeks ago 39.2MB k8s.gcr.io/pause 3.1 da86e6ba6ca1 9 months ago 742kB [root@master ~]#
重新初始化：
[root@master ~]# kubeadm init --kubernetes-version=v1.12.0 --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --ignore-preflight-errors=Swap [init] using Kubernetes version: v1.12.0 [preflight] running pre-flight checks [preflight/images] Pulling images required for setting up a Kubernetes cluster [preflight/images] This might take a minute or two, depending on the speed of your internet connection [preflight/images] You can also perform this action in beforehand using 'kubeadm config images pull' [kubelet] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [preflight] Activating the kubelet service [certificates] Generated front-proxy-ca certificate and key. [certificates] Generated front-proxy-client certificate and key. [certificates] Generated etcd/ca certificate and key. [certificates] Generated etcd/peer certificate and key. [certificates] etcd/peer serving cert is signed for DNS names [master localhost] and IPs [192.168.10.101 127.0.0.1 ::1] [certificates] Generated apiserver-etcd-client certificate and key. [certificates] Generated etcd/server certificate and key. [certificates] etcd/server serving cert is signed for DNS names [master localhost] and IPs [127.0.0.1 ::1] [certificates] Generated etcd/healthcheck-client certificate and key. [certificates] Generated ca certificate and key. [certificates] Generated apiserver certificate and key. [certificates] apiserver serving cert is signed for DNS names [master kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.10.101] [certificates] Generated apiserver-kubelet-client certificate and key. [certificates] valid certificates and keys now exist in "/etc/kubernetes/pki" [certificates] Generated sa key and public key. [kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/admin.conf" [kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf" [kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/controller-manager.conf" [kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/scheduler.conf" [controlplane] wrote Static Pod manifest for component kube-apiserver to "/etc/kubernetes/manifests/kube-apiserver.yaml" [controlplane] wrote Static Pod manifest for component kube-controller-manager to "/etc/kubernetes/manifests/kube-controller-manager.yaml" [controlplane] wrote Static Pod manifest for component kube-scheduler to "/etc/kubernetes/manifests/kube-scheduler.yaml" [etcd] Wrote Static Pod manifest for a local etcd instance to "/etc/kubernetes/manifests/etcd.yaml" [init] waiting for the kubelet to boot up the control plane as Static Pods from directory "/etc/kubernetes/manifests" [init] this might take a minute or longer if the control plane images have to be pulled [apiclient] All control plane components are healthy after 71.135592 seconds [uploadconfig] storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace [kubelet] Creating a ConfigMap "kubelet-config-1.12" in namespace kube-system with the configuration for the kubelets in the cluster [markmaster] Marking the node master as master by adding the label "node-role.kubernetes.io/master=''" [markmaster] Marking the node master as master by adding the taints [node-role.kubernetes.io/master:NoSchedule] [patchnode] Uploading the CRI Socket information "/var/run/dockershim.sock" to the Node API object "master" as an annotation [bootstraptoken] using token: qaqahg.5xbt355fl26wu8tg [bootstraptoken] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials [bootstraptoken] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token [bootstraptoken] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster [bootstraptoken] creating the "cluster-info" ConfigMap in the "kube-public" namespace [addons] Applied essential addon: CoreDNS [addons] Applied essential addon: kube-proxy Your Kubernetes master has initialized successfully! To start using your cluster, you need to run the following as a regular user: mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config You should now deploy a pod network to the cluster. Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at: https://kubernetes.io/docs/concepts/cluster-administration/addons/ You can now join any number of machines by running the following on each node as root: kubeadm join 192.168.10.101:6443 --token qaqahg.5xbt355fl26wu8tg --discovery-token-ca-cert-hash sha256:654f52a18fa04234c05eb38a001d92b9831982d06272e5a22b7d898bc6280e47 [root@master ~]#
OK。初始化成功。
初始化成功，最后的提示：很重要
Your Kubernetes master has initialized successfully! To start using your cluster, you need to run the following as a regular user: mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config You should now deploy a pod network to the cluster. Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at: https://kubernetes.io/docs/concepts/cluster-administration/addons/ You can now join any number of machines by running the following on each node as root: kubeadm join 192.168.10.101:6443 --token qaqahg.5xbt355fl26wu8tg --discovery-token-ca-cert-hash sha256:654f52a18fa04234c05eb38a001d92b9831982d06272e5a22b7d898bc6280e47
master节点：按照提示，做以下操作：
[root@master ~]# mkdir -p $HOME/.kube [root@master ~]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config cp: overwrite ‘/root/.kube/config’? y [root@master ~]# chown $(id -u):$(id -g) $HOME/.kube/config [root@master ~]#
查看一下：
[root@master ~]# kubectl get componentstatus
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-0 Healthy {"health": "true"}
[root@master ~]# kubectl get cs
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {"health": "true"}
[root@master ~]#健康状态。
查看集群节点：
[root@master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master NotReady master 110m v1.12.1 [root@master ~]#
只有master节点，但处于NotReady状态。因为没有部署flannel。
（7）安装flannel
地址：https://github.com/coreos/flannel
执行以下命令：
[root@master ~]# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml clusterrole.rbac.authorization.k8s.io/flannel created clusterrolebinding.rbac.authorization.k8s.io/flannel created serviceaccount/flannel created configmap/kube-flannel-cfg created daemonset.extensions/kube-flannel-ds-amd64 created daemonset.extensions/kube-flannel-ds-arm64 created daemonset.extensions/kube-flannel-ds-arm created daemonset.extensions/kube-flannel-ds-ppc64le created daemonset.extensions/kube-flannel-ds-s390x created [root@master ~]#
执行完成后，需要等待很长时间，因为要下载flannel镜像。
[root@master ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE k8s.gcr.io/kube-controller-manager v1.12.0 07e068033cf2 2 weeks ago 164MB k8s.gcr.io/kube-apiserver v1.12.0 ab60b017e34f 2 weeks ago 194MB k8s.gcr.io/kube-scheduler v1.12.0 5a1527e735da 2 weeks ago 58.3MB k8s.gcr.io/kube-proxy v1.12.0 9c3a9d3f09a0 2 weeks ago 96.6MB k8s.gcr.io/etcd 3.2.24 3cab8e1b9802 3 weeks ago 220MB k8s.gcr.io/coredns 1.2.2 367cdc8433a4 6 weeks ago 39.2MB quay.io/coreos/flannel v0.10.0-amd64 f0fad859c909 8 months ago 44.6MB k8s.gcr.io/pause 3.1 da86e6ba6ca1 9 months ago 742kB [root@master ~]#
OK，flannel镜像下载完成。查看节点：
[root@master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master Ready master 155m v1.12.1 [root@master ~]#
OK，master处于Ready状态。
如果flannel下载不成功，可以下载阿里云的：
docker pull registry.cn-shenzhen.aliyuncs.com/lurenjia/flannel:v0.10.0-amd64
下载成功后，修改镜像的tag：
docker tag registry.cn-shenzhen.aliyuncs.com/lurenjia/flannel:v0.10.0-amd64 quay.io/coreos/flannel：v0.10.0-amd64
查看一下命名空间情况：
[root@master ~]# kubectl get ns NAME STATUS AGE default Active 158m kube-public Active 158m kube-system Active 158m [root@master ~]#
查看kube-system的pod：
[root@master ~]# kubectl get pods -n kube-system NAME READY STATUS RESTARTS AGE coredns-576cbf47c7-hfvcq 1/1 Running 0 158m coredns-576cbf47c7-xcpgd 1/1 Running 0 158m etcd-master 1/1 Running 6 132m kube-apiserver-master 1/1 Running 9 132m kube-controller-manager-master 1/1 Running 33 132m kube-flannel-ds-amd64-vqc9h 1/1 Running 3 41m kube-proxy-z9xrw 1/1 Running 4 158m kube-scheduler-master 1/1 Running 33 132m [root@master ~]#
1、安装docker-ce、kubelet、kubeadm
[root@node1 ~]# yum install docker-ce kubelet kubeadm -y [root@node2 ~]# yum install docker-ce kubelet kubeadm -y
2、复制master节点的文件到node
[root@master ~]# scp /etc/sysconfig/kubelet 192.168.10.103:/etc/sysconfig/ kubelet 100% 42 45.4KB/s 00:00 [root@master ~]# scp /etc/sysconfig/kubelet 192.168.10.104:/etc/sysconfig/ kubelet 100% 42 4.0KB/s 00:00 [root@master ~]#
3、node节点加入集群
启动docker、kubelet
[root@node1 ~]# systemctl start docker kubelet [root@node1 ~]# systemctl enable docker kubelet [root@node2 ~]# systemctl start docker kubelet [root@node2 ~]# systemctl enable docker kubelet
node节点加入集群：
[root@node1 ~]# kubeadm join 192.168.10.101:6443 --token qaqahg.5xbt355fl26wu8tg --discovery-token-ca-cert-hash sha256:654f52a18fa04234c05eb38a001d92b9831982d06272e5a22b7d898bc6280e47 --ignore-preflight-errors=Swap
[preflight] running pre-flight checks
[WARNING RequiredIPVSKernelModulesAvailable]: the IPVS proxier will not be used, because the following required kernel modules are not loaded: [ip_vs ip_vs_rr ip_vs_wrr ip_vs_sh] or no builtin kernel ipvs support: map[ip_vs_wrr:{} ip_vs_sh:{} nf_conntrack_ipv4:{} ip_vs:{} ip_vs_rr:{}]
you can solve this problem with following methods:
1. Run 'modprobe -- ' to load missing kernel modules;
2. Provide the missing builtin kernel ipvs support
[WARNING Swap]: running with swap on is not supported. Please disable swap
[preflight] Some fatal errors occurred:
[ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables contents are not set to 1
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
[root@node1 ~]# echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
[root@node1 ~]#报错，按提示设置即可。
[root@node1 ~]# kubeadm join 192.168.10.101:6443 --token qaqahg.5xbt355fl26wu8tg --discovery-token-ca-cert-hash sha256:654f52a18fa04234c05eb38a001d92b9831982d06272e5a22b7d898bc6280e47 --ignore-preflight-errors=Swap
[preflight] running pre-flight checks
[WARNING RequiredIPVSKernelModulesAvailable]: the IPVS proxier will not be used, because the following required kernel modules are not loaded: [ip_vs ip_vs_rr ip_vs_wrr ip_vs_sh] or no builtin kernel ipvs support: map[ip_vs_rr:{} ip_vs_wrr:{} ip_vs_sh:{} nf_conntrack_ipv4:{} ip_vs:{}]
you can solve this problem with following methods:
1. Run 'modprobe -- ' to load missing kernel modules;
2. Provide the missing builtin kernel ipvs support
[WARNING Swap]: running with swap on is not supported. Please disable swap
[discovery] Trying to connect to API Server "192.168.10.101:6443"
[discovery] Created cluster-info discovery client, requesting info from "https://192.168.10.101:6443"
[discovery] Requesting info from "https://192.168.10.101:6443" again to validate TLS against the pinned public key
[discovery] Cluster info signature and contents are valid and TLS certificate validates against pinned roots, will use API Server "192.168.10.101:6443"
[discovery] Successfully established connection with API Server "192.168.10.101:6443"
[kubelet] Downloading configuration for the kubelet from the "kubelet-config-1.12" ConfigMap in the kube-system namespace
[kubelet] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[preflight] Activating the kubelet service
[tlsbootstrap] Waiting for the kubelet to perform the TLS Bootstrap...
[patchnode] Uploading the CRI Socket information "/var/run/dockershim.sock" to the Node API object "node1" as an annotation
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the master to see this node join the cluster.
[root@node1 ~]#OK，node1加入成功。
[root@node2 ~]# echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
[root@node2 ~]# kubeadm join 192.168.10.101:6443 --token qaqahg.5xbt355fl26wu8tg --discovery-token-ca-cert-hash sha256:654f52a18fa04234c05eb38a001d92b9831982d06272e5a22b7d898bc6280e47 --ignore-preflight-errors=Swap
[preflight] running pre-flight checks
[WARNING RequiredIPVSKernelModulesAvailable]: the IPVS proxier will not be used, because the following required kernel modules are not loaded: [ip_vs_rr ip_vs_wrr ip_vs_sh ip_vs] or no builtin kernel ipvs support: map[ip_vs:{} ip_vs_rr:{} ip_vs_wrr:{} ip_vs_sh:{} nf_conntrack_ipv4:{}]
you can solve this problem with following methods:
1. Run 'modprobe -- ' to load missing kernel modules;
2. Provide the missing builtin kernel ipvs support
[WARNING Swap]: running with swap on is not supported. Please disable swap
[discovery] Trying to connect to API Server "192.168.10.101:6443"
[discovery] Created cluster-info discovery client, requesting info from "https://192.168.10.101:6443"
[discovery] Requesting info from "https://192.168.10.101:6443" again to validate TLS against the pinned public key
[discovery] Cluster info signature and contents are valid and TLS certificate validates against pinned roots, will use API Server "192.168.10.101:6443"
[discovery] Successfully established connection with API Server "192.168.10.101:6443"
[kubelet] Downloading configuration for the kubelet from the "kubelet-config-1.12" ConfigMap in the kube-system namespace
[kubelet] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[preflight] Activating the kubelet service
[tlsbootstrap] Waiting for the kubelet to perform the TLS Bootstrap...
[patchnode] Uploading the CRI Socket information "/var/run/dockershim.sock" to the Node API object "node2" as an annotation
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the master to see this node join the cluster.
[root@node2 ~]#OK，node2加入成功。
4、node手动下载kube-proxy、pause镜像
node节点均执行以下命令：
for ima in kube-proxy:v1.12.0 pause:3.1;do docker pull registry.cn-shenzhen.aliyuncs.com/lurenjia/$ima && docker tag registry.cn-shenzhen.aliyuncs.com/lurenjia/$ima k8s.gcr.io/$ima && docker rmi -f registry.cn-shenzhen.aliyuncs.com/lurenjia/$ima ;done
5、到master节点查看node情况：
[root@master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master Ready master 3h20m v1.12.1 node1 Ready <none> 18m v1.12.1 node2 Ready <none> 17m v1.12.1 [root@master ~]#
OK，全部处于Ready状态。如果node节点还是不正常，就重启一下node节点的docker、kubelet服务。
查看kube-system的pod信息：
[root@master ~]# kubectl get pods -n kube-system -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE coredns-576cbf47c7-hfvcq 1/1 Running 0 3h21m 10.244.0.3 master <none> coredns-576cbf47c7-xcpgd 1/1 Running 0 3h21m 10.244.0.2 master <none> etcd-master 1/1 Running 6 165m 192.168.10.101 master <none> kube-apiserver-master 1/1 Running 9 165m 192.168.10.101 master <none> kube-controller-manager-master 1/1 Running 33 165m 192.168.10.101 master <none> kube-flannel-ds-amd64-bd4d8 1/1 Running 0 21m 192.168.10.103 node1 <none> kube-flannel-ds-amd64-srhb9 1/1 Running 0 20m 192.168.10.104 node2 <none> kube-flannel-ds-amd64-vqc9h 1/1 Running 3 74m 192.168.10.101 master <none> kube-proxy-8bfvt 1/1 Running 1 21m 192.168.10.103 node1 <none> kube-proxy-gz55d 1/1 Running 1 20m 192.168.10.104 node2 <none> kube-proxy-z9xrw 1/1 Running 4 3h21m 192.168.10.101 master <none> kube-scheduler-master 1/1 Running 33 165m 192.168.10.101 master <none> [root@master ~]#
至此，集群搭建成功。看看搭建用到的镜像有哪些：
master节点：
[root@master ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE k8s.gcr.io/kube-controller-manager v1.12.0 07e068033cf2 2 weeks ago 164MB k8s.gcr.io/kube-apiserver v1.12.0 ab60b017e34f 2 weeks ago 194MB k8s.gcr.io/kube-scheduler v1.12.0 5a1527e735da 2 weeks ago 58.3MB k8s.gcr.io/kube-proxy v1.12.0 9c3a9d3f09a0 2 weeks ago 96.6MB k8s.gcr.io/etcd 3.2.24 3cab8e1b9802 3 weeks ago 220MB k8s.gcr.io/coredns 1.2.2 367cdc8433a4 6 weeks ago 39.2MB quay.io/coreos/flannel v0.10.0-amd64 f0fad859c909 8 months ago 44.6MB k8s.gcr.io/pause 3.1 da86e6ba6ca1 9 months ago 742kB [root@master ~]#
node节点：
[root@node1 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE k8s.gcr.io/kube-proxy v1.12.0 9c3a9d3f09a0 2 weeks ago 96.6MB quay.io/coreos/flannel v0.10.0-amd64 f0fad859c909 8 months ago 44.6MB k8s.gcr.io/pause 3.1 da86e6ba6ca1 9 months ago 742kB [root@node1 ~]# [root@node2 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE k8s.gcr.io/kube-proxy v1.12.0 9c3a9d3f09a0 2 weeks ago 96.6MB quay.io/coreos/flannel v0.10.0-amd64 f0fad859c909 8 months ago 44.6MB k8s.gcr.io/pause 3.1 da86e6ba6ca1 9 months ago 742kB [root@node2 ~]#
跑一个nginx
[root@master ~]# kubectl run nginx-deploy --image=nginx --port=80 --replicas=1 deployment.apps/nginx-deploy created [root@master ~]# kubectl get deploy NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE nginx-deploy 1 1 1 1 10s [root@master ~]# kubectl get pods -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE nginx-deploy-8c5fc574c-d8jxj 1/1 Running 0 18s 10.244.2.4 node2 <none> [root@master ~]#
在node节点上看看可不可以访问这个nginx：
[root@node1 ~]# curl -I 10.244.2.4 HTTP/1.1 200 OK Server: nginx/1.15.5 Date: Tue, 16 Oct 2018 12:02:34 GMT Content-Type: text/html Content-Length: 612 Last-Modified: Tue, 02 Oct 2018 14:49:27 GMT Connection: keep-alive ETag: "5bb38577-264" Accept-Ranges: bytes [root@node1 ~]#
返回200，访问成功。
[root@master ~]# kubectl expose deployment nginx-deploy --name=nginx --port=80 --target-port=80 --protocol=TCP service/nginx exposed [root@master ~]# kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 21h nginx ClusterIP 10.104.88.59 <none> 80/TCP 51s [root@master ~]#
启动一个busybox：
[root@master ~]# kubectl run client --image=busybox --replicas=1 -it --restart=Never
If you don't see a command prompt, try pressing enter.
/ #
/ # wget -O - -q http://nginx:80
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h2>Welcome to nginx!</h2>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
/ #删除重新建：
[root@master ~]# kubectl delete svc nginx service "nginx" deleted [root@master ~]# kubectl expose deployment nginx-deploy --name=nginx service/nginx exposed [root@master ~]# kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22h nginx ClusterIP 10.110.52.68 <none> 80/TCP 8s [root@master ~]#
创建多副本：
[root@master ~]# kubectl run myapp --image=ikubernetes/myapp:v1 --replicas=2 deployment.apps/myapp created [root@master ~]# [root@master ~]# kubectl get deployment NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE myapp 2 2 2 2 49s nginx-deploy 1 1 1 1 36m [root@master ~]# kubectl get pods -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE client 1/1 Running 0 3m49s 10.244.2.6 node2 <none> myapp-6946649ccd-knd8r 1/1 Running 0 78s 10.244.2.7 node2 <none> myapp-6946649ccd-pfl2r 1/1 Running 0 78s 10.244.1.6 node1 <none> nginx-deploy-8c5fc574c-5bjjm 1/1 Running 0 12m 10.244.1.5 node1 <none> [root@master ~]#
给myapp创建service：
[root@master ~]# kubectl expose deployment myapp --name=myapp --port=80 service/myapp exposed [root@master ~]# kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22h myapp ClusterIP 10.110.238.138 <none> 80/TCP 11s nginx ClusterIP 10.110.52.68 <none> 80/TCP 9m37s [root@master ~]#
将myapp扩展到5个：
[root@master ~]# kubectl scale --replicas=5 deployment myapp deployment.extensions/myapp scaled [root@master ~]# kubectl get pods NAME READY STATUS RESTARTS AGE client 1/1 Running 0 5m24s myapp-6946649ccd-6kqxt 1/1 Running 0 8s myapp-6946649ccd-7xj45 1/1 Running 0 8s myapp-6946649ccd-8nh9q 1/1 Running 0 8s myapp-6946649ccd-knd8r 1/1 Running 0 11m myapp-6946649ccd-pfl2r 1/1 Running 0 11m nginx-deploy-8c5fc574c-5bjjm 1/1 Running 0 23m [root@master ~]#
修改myapp:
[root@master ~]# kubectl edit svc myapp type: NodePort
type改为：NodePort
[root@master ~]# kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 23h myapp NodePort 10.110.238.138 <none> 80:30937/TCP 35m nginx ClusterIP 10.110.52.68 <none> 80/TCP 44m [root@master ~]#
端口：30937，物理机打开：192.168.10.101：30937
OK，可以访问。
1、资源类型
资源：实例化之后为对象，主要有：
wordload：Pod，ReplicaSet，Deployment，StatefulSet，DaemonSet，Job，Cronjob。。。
服务发现及均衡：Service，Ingress，。。。
配置与存储：Volume，CSI，特殊的有ConfigMap,Secret；DownwardAPI
集群级资源：Namespace，Node，Role，ClusterRole,RoleBinding，ClusterRoleBinding
元数据型资源：HPA，PodTemplate，LimitRange
2、创建资源的方法：
apiserver仅接收JSON格式的资源定义；
yaml格式提供配置清单，apiserver可自动将其转为json格式，而后再提交；
大部分资源的配置清单：
apiVesion： group/version，使用kubectl api-versions可以查看
kind： 资源类别 metadata：元数据（name，namespace，labels，annotations） 每个的资源的引用PATH：/api/GROUP/VERSION/namespace/NAMESPACE/TYPE/NAME，例如： /api/v1/namespaces/default/pods/myapp-6946649ccd-c6m9b spec：期望的状态，disired state status：当前状态，current state，本字段由kubernetes集群维护 查看某种资源的定义，比如：查看pod
root@master ~]# kubectl explain pod KIND: Pod VERSION: v1 DESCRIPTION: 。。。
pod资源定义示例：
[root@master ~]# mkdir maniteste [root@master ~]# vim maniteste/pod-demo.yaml apiVersion: v1 kind: Pod metadata: name: pod-demo namespace: default labels: app: myapp tier: frontend spec: containers: - name: myapp image: ikubernetes/myapp:v1 - name: busybox image: busybox:latest command: - "/bin/sh" - "-c" - "sleep 5"
创建资源：
[root@master ~]# kubectl create -f maniteste/pod-demo.yaml [root@master ~]# kubectl describe pods pod-demo Name: pod-demo Namespace: default Priority: 0 PriorityClassName: <none> Node: node2/192.168.10.104 Start Time: Wed, 17 Oct 2018 19:54:03 +0800 Labels: app=myapp tier=frontend Annotations: <none> Status: Running IP: 10.244.2.26
查看日志：
[root@master ~]# curl 10.244.2.26 Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a> [root@master ~]# kubectl logs pod-demo myapp 10.244.0.0 - - [17/Oct/2018:11:56:49 +0000] "GET / HTTP/1.1">
1个pod跑2个容器。
删除pod：kubectl delete -f maniteste/pod-demo.yaml
1、查看pod的containers定义信息：kubectl explain pods.spec.containers
资源配置清单：
自主式Pod资源 资源清单格式： 一级字段：apiVersion（group/version），kind，metadata（name，namespace，labels，annotations，。。），spec，status(只读) Pod资源： spec.containers <\[\]object> \- name <string> image <string> imagePullPlocy Always | Never | IfNotPresent
2、标签：
key=value，key由字母、数字、_、-、.组成。 value：可以为空，只能字母或数字开头或结尾，中间可以使用
打标签：
[root@master ~]# kubectl get pods -l app --show-labels NAME READY STATUS RESTARTS AGE LABELS pod-demo 0/2 ContainerCreating 0 4m46s app=myapp,tier=frontend [root@master ~]# kubectl label pods pod-demo release=haha pod/pod-demo labeled [root@master ~]# kubectl get pods -l app --show-labels NAME READY STATUS RESTARTS AGE LABELS pod-demo 0/2 ContainerCreating 0 5m27s app=myapp,release=haha,tier=frontend [root@master ~]#
查看拥有某标签的pod：
[root@master ~]# kubectl get pods -l app,release NAME READY STATUS RESTARTS AGE pod-demo 0/2 ContainerCreating 0 7m43s [root@master ~]#
标签选择器：
等值关系：=、==、！=
如： kubectl get pods -l release=stable
集合关系：KEY in (VALUE1,VALUE2….) 、KEY notin (VALUE1,VALUE2….)、KEY、！KEY
[root@master ~]# kubectl get pods -l "release notin (stable,haha)" NAME READY STATUS RESTARTS AGE client 0/1 Error 0 46h myapp-6946649ccd-2lncx 1/1 Running 2 46h nginx-deploy-8c5fc574c-5bjjm 1/1 Running 2 46h [root@master ~]#
许多资源支持内嵌字段定义其使用的标签选择器：
matchLabels：直接给定键值
matchExpressions：基于给定的表达式来定义使用标签选择器，{key:"KEY",operator:"OPRATOR",values:[VAL1，VAL2，。。。]}
操作符（operator）：In，NotIn：values字段的值必须为非空列表，Exists，NotExists：values字段的值必须为空列表
3、nodeSelector ：节点标签选择器
nodeName
给某个节点打标签，比如：
[root@master ~]# kubectl label nodes node1 disktype=ssd node/node1 labeled [root@master ~]#
修改yaml文件：
[root@master ~]# vim maniteste/pod-demo.yaml apiVersion: v1 kind: Pod metadata: name: pod-demo namespace: default labels: app: myapp tier: frontend spec: containers: - name: myapp image: ikubernetes/myapp:v1 ports: - name: http containerPort: 80 - name: busybox image: busybox:latest imagePullPolicy: IfNotPresent command: - "/bin/sh" - "-c" - "sleep 5" nodeSelector: disktype: ssd
重新创建：
[root@master ~]# kubectl delete pods pod-demo pod "pod-demo" deleted [root@master ~]# kubectl create -f maniteste/pod-demo.yaml pod/pod-demo created [root@master ~]#
4、annotations
与label不同的地方在于，它不能用于挑选资源对象，仅用于为对象提供“元数据”
示例：
apiVersion: v1 kind: Pod metadata: name: pod-demo namespace: default labels: app: myapp tier: frontend annotations: haha.com/create_by: "hello world" spec: containers: - name: myapp image: ikubernetes/myapp:v1 ports: - name: http containerPort: 80 - name: busybox image: busybox:latest imagePullPolicy: IfNotPresent command: - "/bin/sh" - "-c" - "sleep 3600" nodeSelector: disktype: ssd
5、Pod生命周期
状态：Pending（挂起），Running，Failed，Success，Unknown
Pod生命周期中的重要行为：初始化容器、容器探测（liveness、readliness）
restartPolicy：Always, OnFailure,Never. Default to Always
探针类型： ExecAction、TCPSocketAction、HTTPGetAction。
ExecAction举例：
[root@master ~]# vim liveness-exec.yaml apiVersion: v1 kind: Pod metadata: name: liveness-exec-pod namespace: default spec: containers: - name: liveness-exec-container image: busybox:latest imagePullPolicy: IfNotPresent command: ["/bin/sh","-c","touch /tmp/healthy; sleep 30; rm -f /tmp/healthy; sleep 3600"] livenessProbe: exec: command: ["test","-e","/tmp/healthy"] initialDelaySeconds: 2 periodSeconds: 3
创建：
[root@master ~]# kubectl create -f liveness-exec.yaml pod/liveness-exec-pod created [root@master ~]# kubectl get pods -w NAME READY STATUS RESTARTS AGE client 0/1 Error 0 3d liveness-exec-pod 1/1 Running 3 3m myapp-6946649ccd-2lncx 1/1 Running 4 3d nginx-deploy-8c5fc574c-5bjjm 1/1 Running 4 3d liveness-exec-pod 1/1 Running 4 4m
HTTPGetAction举例：
[root@master ~]# vim liveness-httpGet.yaml apiVersion: v1 kind: Pod metadata: name: liveness-httpget-pod namespace: default spec: containers: - name: liveness-httpget-container image: ikubernetes/myapp:v1 imagePullPolicy: IfNotPresent ports: - name: http containerPort: 80 livenessProbe: httpGet: port: http path: /index.html initialDelaySeconds: 1 periodSeconds: 3 [root@master ~]# kubectl create -f liveness-httpGet.yaml pod/liveness-httpget-pod created [root@master ~]#
readiness：
[root@master ~]# vim readiness-httget.yaml apiVersion: v1 kind: Pod metadata: name: readiness-httpget-pod namespace: default spec: containers: kind: Pod metadata: name: readiness-httpget-pod namespace: default spec: containers: - name: readiness-httpget-container image: ikubernetes/myapp:v1 imagePullPolicy: IfNotPresent ports: - name: http containerPort: 80 readinessProbe: httpGet: port: http path: /index.html initialDelaySeconds: 1 periodSeconds: 3
容器生命周期-poststart示例：
[root@master ~]# vim poststart-pod.yaml apiVersion: v1 kind: Pod metadata: name: poststart-pod namespace: default spec: containers: - name: busybox-httpd image: busybox:latest imagePullPolicy: IfNotPresent lifecycle: postStart: exec: command: ["/bin/sh","-c","echo Home_Page >> /tmp/index.html"] #command: ['/bin/sh','-c','sleep 3600'] command: ["/bin/httpd"] args: ["-f","-h /tmp"] [root@master ~]# kubectl create -f poststart-pod.yaml pod/poststart-pod created [root@master ~]#
但，使用/tmp目录作为网站目录肯定是不行的。
6、Pod控制器
pod控制器有多种类型：
ReplicaSet: 代用户创建指定数量的pod副本数量，确保pod副本数量符合预期状态，并且支持滚动式自动扩容和缩容功能。
ReplicaSet主要三个组件组成：
（1）用户期望的pod副本数量
（2）标签选择器，判断哪个pod归自己管理
（3）当现存的pod数量不足，会根据pod资源模板进行新建
帮助用户管理无状态的pod资源，精确反应用户定义的目标数量，但是RelicaSet不是直接使用的控制器，而是使用Deployment。
Deployment：工作在ReplicaSet之上，用于管理无状态应用，目前来说最好的控制器。支持滚动更新和回滚功能，还提供声明式配置。
DaemonSet：用于确保集群中的每一个节点只运行特定的pod副本，通常用于实现系统级后台任务。比如ELK服务
特性：服务是无状态的，服务必须是守护进程
Job：只要完成就立即退出，不需要重启或重建。
Cronjob：周期性任务控制，不需要持续后台运行，
StatefulSet：管理有状态应用
ReplicaSet（rs）示例：
[root@master ~]# kubectl get deployments NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE myapp 1 1 1 1 4d nginx-deploy 1 1 1 1 4d1h [root@master ~]# kubectl delete deploy myapp deployment.extensions "myapp" deleted [root@master ~]# kubectl delete deploy nginx-deploy deployment.extensions "nginx-deploy" deleted [root@master ~]# [root@master ~]# vim rs-demo.yaml apiVersion: apps/v1 kind: ReplicaSet metadata: name: myapp namespace: default spec: replicas: 2 selector: matchLabels: app: myapp release: canary template: metadata: name: myapp-pod labels: app: myapp release: canary environment: qa spec: containers: - name: myapp-conatainer image: ikubernetes/myapp:v1 ports: - name: http containerPort: 80 [root@master ~]# kubectl create -f rs-demo.yaml replicaset.apps/myapp created
查看标签：
[root@master ~]# kubectl get pods --show-labels NAME READY STATUS RESTARTS AGE LABELS client 0/1 Error 0 4d run=client liveness-httpget-pod 1/1 Running 1 107m <none> myapp-fspr7 1/1 Running 0 75s app=myapp,environment=qa,release=canary myapp-ppxrw 1/1 Running 0 75s app=myapp,environment=qa,release=canary pod-demo 2/2 Running 0 3s app=myapp,tier=frontend readiness-httpget-pod 1/1 Running 0 86m <none> [root@master ~]#
给pod-demo打一个标签release=canary：
[root@master ~]# kubectl label pods pod-demo release=canary pod/pod-demo labeled
deploy示例：
[root@master ~]# kubectl delete rs myapp replicaset.extensions "myapp" deleted [root@master ~]# [root@master ~]# vim deploy-demo.yaml apiVersion: apps/v1 kind: Deployment metadata: name: myapp-deploy namespace: default spec: replicas: 2 selector: matchLabels: app: myapp release: canary template: metadata: labels: app: myapp release: canary spec: containers: - name: myapp image: ikubernetes/myapp:v1 ports: - name: http containerPort: 80 [root@master ~]# kubectl create -f deploy-demo.yaml deployment.apps/myapp-deploy created [root@master ~]# [root@master ~]# kubectl get pods NAME READY STATUS RESTARTS AGE client 0/1 Error 0 4d20h liveness-httpget-pod 1/1 Running 2 22h myapp-deploy-574965d786-5x42g 1/1 Running 0 70s myapp-deploy-574965d786-dqzpd 1/1 Running 0 70s pod-demo 2/2 Running 3 20h readiness-httpget-pod 1/1 Running 1 21h [root@master ~]# kubectl get rs NAME DESIRED CURRENT READY AGE myapp-deploy-574965d786 2 2 2 93s [root@master ~]#
如果要修改副本数，则编辑deploy-demo.yaml修改副本数，执行kubectl apply -f deploy-demo.yaml
或者：kubectl patch deployment myapp-deploy -p '{"spec":{"replicas":5}}'，这里是修改5个副本。
修改其他属性，比如：
[root@master ~]# kubectl patch deployment myapp-deploy -p '{"spec":{"strategy":{"rollingUpdate":{"maxSurge":1,"maxUnavailable":0}}}}'
deployment.extensions/myapp-deploy patched
[root@master ~]#更新版本：
[root@master ~]# kubectl set image deployment myapp-deploy myapp=ikubernetes/myapp:v3 && kubectl rollout pause deployment myapp-deploy deployment.extensions/myapp-deploy image updated deployment.extensions/myapp-deploy paused [root@master ~]# [root@master ~]# kubectl rollout status deployment myapp-deploy Waiting for deployment "myapp-deploy" rollout to finish: 1 out of 2 new replicas have been updated... [root@master ~]# kubectl rollout resume deployment myapp-deploy deployment.extensions/myapp-deploy resumed [root@master ~]#
版本回滚：
[root@master ~]# kubectl rollout undo deployment myapp-deploy --to-revision=1 deployment.extensions/myapp-deploy [root@master ~]#
DaemonSet示例：
node1、node2执行：docker pull ikubernetes/filebeat:5.6.5-alpine
编辑yaml文件：
[root@master ~]# vim ds-demo.yaml apiVersion: apps/v1 kind: DaemonSet metadata: name: myapp-ds namespace: default spec: selector: matchLabels: app: filebeat release: stable template: metadata: labels: app: filebeat release: stable spec: containers: - name: filebeat image: ikubernetes/filebeat:5.6.5-alpine env: - name: REDIS_HOST value: redis.default.svc.cluster.local - name: REDIS_LOG_LEVEL value: info [root@master ~]# kubectl apply -f ds-demo.yaml daemonset.apps/myapp-ds created [root@master ~]#
修改yaml文件：
[root@master ~]# vim ds-demo.yaml apiVersion: apps/v1 kind: Deployment metadata: name: redis namespace: default spec: replicas: 1 selector: matchLabels: app: redis role: logstor template: metadata: labels: app: redis role: logstor spec: containers: - name: redis image: redis:4.0-alpine ports: - name: redis containerPort: 6379 --- apiVersion: apps/v1 kind: DaemonSet metadata: name: filebeat-ds namespace: default spec: selector: matchLabels: app: filebeat release: stable template: metadata: labels: app: filebeat release: stable spec: containers: - name: filebeat image: ikubernetes/filebeat:5.6.5-alpine env: - name: REDIS_HOST value: redis.default.svc.cluster.local - name: REDIS_LOG_LEVEL value: info [root@master ~]# kubectl delete -f ds-demo.yaml [root@master ~]# kubectl apply -f ds-demo.yaml deployment.apps/redis created daemonset.apps/filebeat-ds created [root@master ~]#
暴露redis端口：
[root@master ~]# kubectl expose deployment redis --port=6379 service/redis exposed [root@master ~]# kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 5d20h myapp NodePort 10.110.238.138 <none> 80:30937/TCP 4d21h nginx ClusterIP 10.110.52.68 <none> 80/TCP 4d21h redis ClusterIP 10.97.196.222 <none> 6379/TCP 11s [root@master ~]#
进入redis：
[root@master ~]# kubectl get pods NAME READY STATUS RESTARTS AGE redis-664bbc646b-sg6wk 1/1 Running 0 2m55s [root@master ~]# kubectl exec -it redis-664bbc646b-sg6wk -- /bin/sh /data # netstat -tnl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 0.0.0.0:6379 0.0.0.0:* LISTEN tcp 0 0 :::6379 :::* LISTEN /data # nslookup redis.default.svc.cluster.local nslookup: can't resolve '(null)': Name does not resolve Name: redis.default.svc.cluster.local Address 1: 10.97.196.222 redis.default.svc.cluster.local /data # /data # redis-cli -h redis.default.svc.cluster.local redis.default.svc.cluster.local:6379> keys * (empty list or set) redis.default.svc.cluster.local:6379>
进入filebeat：
[root@master ~]# kubectl get pods NAME READY STATUS RESTARTS AGE client 0/1 Error 0 4d21h filebeat-ds-bszfz 1/1 Running 0 6m2s filebeat-ds-w5nzb 1/1 Running 0 6m2s redis-664bbc646b-sg6wk 1/1 Running 0 6m2s [root@master ~]# kubectl exec -it filebeat-ds-bszfz -- /bin/sh / # printenv / # nslookup redis.default.svc.cluster.local / # kill -1 1
更新：[root@master ~]# kubectl set image daemonsets filebeat-ds filebeat=ikubernetes/filebeat:5.6.6-alpine
service是kubernetes中最核心的资源对象之一，Service可以理解成是微服务架构中的一个"微服务“
简单讲，一个service本质上是一组pod组成的一个集群，service和pod之间是通过Label串起来，相同的Service的pod的Label是一样的。同一个service下的所有pod是通过kube-proxy实现负载均衡，而每个service都会分配一个全局唯一的虚拟ip，也就cluster ip。在该service整个生命周期内，cluster ip保持不变，而在kubernetes中还有一个dns服务，它把service的name和cluster ip应声起来。
工作模式：userspace、iptables、ipvs
类型：ExternalName, ClusterIP, NodePort, LoadBalancer
资源记录：SVC_NAME.NS_NAME.DOMAIN.LTD.
svc.cluster.local. 例如：redis.default.svc.cluster.local.
[root@master ~]# kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 5d20h myapp NodePort 10.110.238.138 <none> 80:30937/TCP 4d22h nginx ClusterIP 10.110.52.68 <none> 80/TCP 4d22h redis ClusterIP 10.97.196.222 <none> 6379/TCP 29m [root@master ~]# kubectl delete svc redis [root@master ~]# kubectl delete svc nginx [root@master ~]# kubectl delete svc myapp [root@master ~]# vim redis-svc.yaml apiVersion: v1 kind: Service metadata: name: redis namespace: default spec: selector: app: redis role: logstor clusterIP: 10.97.97.97 type: ClusterIP ports: - port: 6379 targetPort: 6379 [root@master ~]# kubectl apply -f redis-svc.yaml service/redis created [root@master ~]#
NodePort：
[root@master ~]# vim myapp-svc.yaml
apiVersion: v1
kind: Service
metadata:
name: myapp
namespace: default
spec:
selector:
app: myapp
role: canary
clusterIP: 10.99.99.99
type: NodePort
ports:
- port: 80
targetPort: 80
nodePort: 30080
[root@master ~]# kubectl apply -f myapp-svc.yaml
service/myapp created
[root@master ~]#
[root@master ~]# kubectl patch svc myapp -p '{"spec":{"sessionAffinity":"ClientIP"}}'
service/myapp patched
[root@master ~]#不指定ClusterIP：
[root@master ~]# vim myapp-svc-headless.yaml apiVersion: v1 kind: Service metadata: name: myapp-svc namespace: default spec: selector: app: myapp release: canary clusterIP: "None" ports: - port: 80 targetPort: 80 [root@master ~]# kubectl apply -f myapp-svc-headless.yaml service/myapp-svc created [root@master ~]# kubectl get svc -n kube-system NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP 5d21h [root@master ~]# dig -t A myapp-svc.default.svc.cluster.local. @10.96.0.10 ; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7_5.1 <<>> -t A myapp-svc.default.svc.cluster.local. @10.96.0.10 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32215 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;myapp-svc.default.svc.cluster.local. IN A ;; ANSWER SECTION: myapp-svc.default.svc.cluster.local. 5 IN A 10.244.1.59 myapp-svc.default.svc.cluster.local. 5 IN A 10.244.2.51 myapp-svc.default.svc.cluster.local. 5 IN A 10.244.1.60 myapp-svc.default.svc.cluster.local. 5 IN A 10.244.1.58 myapp-svc.default.svc.cluster.local. 5 IN A 10.244.2.52 ;; Query time: 2 msec ;; SERVER: 10.96.0.10#53(10.96.0.10) ;; WHEN: Sun Oct 21 19:41:16 CST 2018 ;; MSG SIZE rcvd: 319 [root@master ~]#
Ingress可以简单的理解成k8s内部的nginx, 用作负载均衡器。
Ingress由两部分组成：Ingress Controller 和 Ingress 服务。
ingress-nginx：https://github.com/kubernetes/ingress-nginx、https://kubernetes.github.io/ingress-nginx/deploy/
1、下载相关文件
[root@master ~]# mkdir ingress-nginx
[root@master ~]# cd ingress-nginx
[root@master ingress-nginx]# for file in namespace.yaml configmap.yaml rbac.yaml with-rbac.yaml ; do curl -O https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/${file};done2、创建
[root@master ingress-nginx]# kubectl apply -f ./
3、编写yaml文件
[root@master ~]# mkdir maniteste/ingress [root@master ~]# cd maniteste/ingress [root@master ingress]#vim deploy-demo.yaml apiVersion: v1 kind: Service metadata: name: myapp namespace: default spec: selector: app: myapp release: canary ports: - name: http port: 80 targetPort: 80 --- apiVersion: apps/v1 kind: Deployment metadata: name: myapp-deploy namespace: default spec: replicas: 3 selector: matchLabels: app: myapp release: canary template: metadata: labels: app: myapp release: canary spec: containers: - name: myapp image: ikubernetes/myapp:v2 ports: - name: http containerPort: 80 [root@master ingress]# kubectl delete svc myapp [root@master ingress]# kubectl delete deployment myapp-deploy [root@master ingress]# kubectl apply -f deploy-demo.yaml service/myapp created deployment.apps/myapp-deploy created [root@master ingress]#
3、创建service
如果不定义nodePort则会随机映射端口。
4、app
[root@master ingress-nginx]# vim ingress-myapp.yaml apiVersion: extensions/v1beta1 kind: Ingress metadata: name: ingress-myapp namespace: default annotations: kubernetes.io/ingress.class: "nginx" spec: rules: - host: myapp.haha.com http: paths: - path: backend: serviceName: myapp servicePort: 80 [root@master ingress-nginx]# kubectl apply -f ingress-myapp.yaml [root@master ~]# kubectl get ingresses NAME HOSTS ADDRESS PORTS AGE ingress-myapp myapp.haha.com 80 58s [root@master ~]#
修改物理机的hosts，浏览器打开：
可以这样查看：kubectl get svc -n ingress-nginx
5、部署一个Tomcat
[root@master ingress-nginx]# vim tomcat-deploy.yaml apiVersion: v1 kind: Service metadata: name: tomcat namespace: default spec: selector: app: tomcat release: canary ports: - name: http port: 8080 targetPort: 8080 - name: ajp port: 8009 targetPort: 8009 --- apiVersion: apps/v1 kind: Deployment metadata: name: tomcat-deploy namespace: default spec: replicas: 3 selector: matchLabels: app: tomcat release: canary template: metadata: labels: app: tomcat release: canary spec: containers: - name: tomcat image: tomcat:8.5.34-jre8-alpine ports: - name: http containerPort: 8080 - name: ajp containerPort: 8009 [root@master ingress-nginx]# vim ingress-tomcat.yaml apiVersion: extensions/v1beta1 kind: Ingress metadata: name: ingress-tomcat namespace: default annotations: kubernetes.io/ingress.class: "tomcat" spec: rules: - host: tomcat.haha.com http: paths: - path: backend: serviceName: tomcat servicePort: 8080 [root@master ingress-nginx]# kubectl apply -f tomcat-deploy.yaml [root@master ingress-nginx]# kubectl apply -f ingress-tomcat.yaml
查看Tomcat：
[root@master ~]# kubectl get pod NAME READY STATUS RESTARTS AGE myapp-deploy-7b64976db9-5ww72 1/1 Running 0 66m myapp-deploy-7b64976db9-fm7jl 1/1 Running 0 66m myapp-deploy-7b64976db9-s6f95 1/1 Running 0 66m tomcat-deploy-695dbfd5bd-6kx42 1/1 Running 0 5m54s tomcat-deploy-695dbfd5bd-f5d7n 0/1 ImagePullBackOff 0 5m54s tomcat-deploy-695dbfd5bd-v5d9d 1/1 Running 0 5m54s [root@master ~]# kubectl exec tomcat-deploy-695dbfd5bd-6kx42 -- netstat -tnl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.1:8005 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:8009 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN [root@master ~]#
可以使用：docker pull tomcat:8.5.34-jre8-alpine实现下载好镜像。
创建ssl证书：
创建私钥：
[root@master ingress]# openssl genrsa -out tls.key 2048
创建自签证书：
[root@master ingress]# openssl req -new -x509 -key tls.key -out tls.crt -subj /C=CN/ST=Guangdong/L=Guangdong/O=DevOps/CN=tomcat.haha.com
要想将证书注入到pod，必须转格式：
[root@master ingress]# kubectl create secret tls tomcat-ingress-secret --cert=tls.crt --key=tls.key secret/tomcat-ingress-secret created [root@master ingress]# kubectl get secret NAME TYPE DATA AGE default-token-kcvkv kubernetes.io/service-account-token 3 8d tomcat-ingress-secret kubernetes.io/tls 2 29s [root@master ingress]#
格式为：kubernetes.io/tls
配置tomcat：
[root@master ingress]# vim ingress-tomcat-tls.yaml apiVersion: extensions/v1beta1 kind: Ingress metadata: name: ingress-tomcat-tls namespace: default annotations: kubernetes.io/ingress.class: "nginx" spec: tls: - hosts: - tomcat.haha.com secretName: tomcat-ingress-secret rules: - host: tomcat.haha.com http: paths: - path: backend: serviceName: tomcat servicePort: 8080 [root@master ingress]# kubectl apply -f ingress-tomcat-tls.yaml ingress.extensions/ingress-tomcat-tls created [root@master ingress]#
浏览器打开：https://tomcat.haha.com:30443/
看完上述内容，你们掌握kubeadm中如何部署kubernetes集群的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注亿速云行业资讯频道，感谢各位的阅读！
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