这篇文章主要介绍kubernetes中Master节点如何安装与配置,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
一:简介
1.kubernetes master节点包含以下组件:kube-apiserver,kube-scheduler和kube-controller-manager。 这三个组件需要部署在同一台机器上。 同时只能有一个kube-scheduler,kube-controller-manager进程处于工作状态,如果运行多个,则需要通过选举产生一个leader.
2.在/etc/kubernetes/ssl目录下,准备好可能用到的证书文件。
admin-key.pem admin.pem ca-key.pem ca.pem kube-proxy-key.pem,kube-proxy.pem kubernetes-key.pem kubernetes.pem
3.下载安装文件 wget https://storage.googleapis.com/kubernetes-release/release/v1.8.5/kubernetes-server-linux-amd64.tar.gz
tar -xzvf kubernetes-server-linux-amd64.tar.gz
cd kubernetes
tar -xzvf kubernetes-src.tar.gz
复制二进制文件到指定目录
cp -r server/bin/{kube-apiserver,kube-controller-manager,kube-scheduler,kubectl,kube-proxy,kubelet} /usrbin/
二:配置和启动 kube-apiserver
1.service配置文件 /usr/lib/systemd/system/kube-apiserver.service
点击(此处)折叠或打开
[Unit]
Description=Kubernetes API Service
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
After=etcd.service
[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/apiserver
ExecStart=/usr/bin/kube-apiserver \
$KUBE_LOGTOSTDERR \
$KUBE_LOG_LEVEL \
$KUBE_ETCD_SERVERS \
$KUBE_API_ADDRESS \
$KUBE_API_PORT \
$KUBELET_PORT \
$KUBE_ALLOW_PRIV \
$KUBE_SERVICE_ADDRESSES \
$KUBE_ADMISSION_CONTROL \
$KUBE_API_ARGS
Restart=on-failure
Type=notify
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
2.配置文件/etc/kubernetes/config
点击(此处)折叠或打开
###
# kubernetes system config
#
# The following values are used to configure various aspects of all
# kubernetes services, including
#
# kube-apiserver.service
# kube-controller-manager.service
# kube-scheduler.service
# kubelet.service
# kube-proxy.service
# logging to stderr means we get it in the systemd journal
KUBE_LOGTOSTDERR="--logtostderr=true"
# journal message level, 0 is debug
KUBE_LOG_LEVEL="--v=0"
# Should this cluster be allowed to run privileged docker containers
KUBE_ALLOW_PRIV="--allow-privileged=true"
# How the controller-manager, scheduler, and proxy find the apiserver
KUBE_MASTER="--master=http://10.116.137.196:8080"
该配置文件同时被kube-apiserver、kube-controller-manager、kubescheduler、kubelet、kube-proxy使用。
3.配置文件 /etc/kubernetes/apiserver
点击(此处)折叠或打开
###
## kubernetes system config
##
## The following values are used to configure the kube-apiserver
##
#
## The address on the local server to listen to.
KUBE_API_ADDRESS="--advertise-address=10.116.137.196 --bind-address=10.116.137.196 --insecure-bind-address=10.116.137.196"
#
## The port on the local server to listen on.
#KUBE_API_PORT="--port=8080"
#
## Port minions listen on
#KUBELET_PORT="--kubelet-port=10250"
#
## Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=https://10.116.137.196:2379,https://10.116.82.28:2379,https://10.116.36.57:2379"
#
## Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
#
## default admission control policies
KUBE_ADMISSION_CONTROL="--admission-control=ServiceAccount,NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota"
#
## Add your own!
KUBE_API_ARGS="--authorization-mode=RBAC --runtime-config=rbac.authorization.k8s.io/v1beta1 --kubelet-https=true --experimental-bootstrap-token-auth --token-auth-file=/etc/kubernetes/token.csv --service-node-port-range=30000-32767 --tls-cert-file=/etc/kubernetes/ssl/kubernetes.pem --tls-private-key-file=/etc/kubernetes/ssl/kubernetes-key.pem --client-ca-file=/etc/kubernetes/ssl/ca.pem --service-account-key-file=/etc/kubernetes/ssl/ca-key.pem --etcd-cafile=/etc/kubernetes/ssl/ca.pem --etcd-certfile=/etc/kubernetes/ssl/kubernetes.pem --etcd-keyfile=/etc/kubernetes/ssl/kubernetes-key.pem --enable-swagger-ui=true --apiserver-count=1 --audit-log-maxage=30 --audit-log-maxbackup=3 --audit-log-maxsize=100 --audit-log-path=/var/lib/audit.log --event-ttl=1h"
a. --authorization-mode=RBAC 指定在安全端口使用 RBAC 授权模式,拒绝未通过授权的请求;
b. kube-scheduler、kube-controller-manager 一般和 kube-apiserver 部署在同一台机器上,它们使非安全端口和 kube-apiserver通信;
kubelet、kube-proxy、kubectl 部署在其它 Node 节点上,如果通过安全端?访问 kube-apiserver,则必须先通过 TLS 证书认证,再通过
RBAC 授权;
c. kube-proxy、kubectl 通过在使?的证书?指定相关的 User、Group来达到通过 RBAC 授权的?的;
d. 如果使用了 kubelet TLS Boostrap 机制,则不能再指定 --kubeletcertificate-authority 、 --kubelet-client-certificate 和 --kubelet-client-key 选项,否则后续 kube-apiserver 校验 kubelet 证
书时出现 ”x509: certificate signed by unknown authority“ 错误;
e. --admission-control 值必须包含 ServiceAccount ;
f. --bind-address 不能为 127.0.0.1 ;
g. runtime-config 配置为 rbac.authorization.k8s.io/v1beta1 ,表示运行时的apiVersion;
h. --service-cluster-ip-range 指定 Service Cluster IP 地址段,该地址段不能路由可达;
i. 缺省情况下 kubernetes 对象保存在 etcd /registry 路径下,可以通过 --etcd-prefix 参数进行调整;
4.启动kube-apiserver
systemctl daemon-reload
systemctl enable kube-apiserver
systemctl start kube-apiserver
systemctl status kube-apiserver
三:配置和启动 kube-controller-manager
1. 服务文件/usr/lib/systemd/system/kube-controller-manager.service
点击(此处)折叠或打开
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/controller-manager
ExecStart=/usr/bin/kube-controller-manager \
$KUBE_LOGTOSTDERR \
$KUBE_LOG_LEVEL \
$KUBE_MASTER \
$KUBE_CONTROLLER_MANAGER_ARGS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
2.配置文件 /etc/kubernetes/controller-manager
点击(此处)折叠或打开
###
# The following values are used to configure the kubernetes controller-manager
# defaults from config and apiserver should be adequate
# Add your own!
KUBE_CONTROLLER_MANAGER_ARGS="--address=127.0.0.1 --service-cluster-ip-range=10.254.0.0/16 --cluster-name=kubernetes --cluster-signing-cert-file=/etc/kubernetes/ssl/ca.pem --cluster-signing-key-file=/etc/kubernetes/ssl/ca-key.pem --service-account-private-key-file=/etc/kubernetes/ssl/ca-key.pem --root-ca-file=/etc/kubernetes/ssl/ca.pem --leader-elect=true"
a. --service-cluster-ip-range 参数指定 Cluster 中 Service 的CIDR范围,该?络在各 Node 间必须路由不可达,必须和 kube-apiserver中的参数一致;
b. --cluster-signing-* 指定的证书和私钥文件用来签名为 TLSBootStrap 创建的证书和私钥;
c. --root-ca-file 用来对 kube-apiserver 证书进行校验,指定该参数后,才会在Pod 容器的 ServiceAccount 中放置该 CA 证书文件;
d. --address 值必须为 127.0.0.1 ,因为当前 kube-apiserver 期望scheduler 和 controller-manager 在同一台机器
3.启动 kube-controller-manager
systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl start kube-controller-manager
四:配置和启动 kube-scheduler
1. 服务文件/usr/lib/systemd/system/kube-scheduler.service
点击(此处)折叠或打开
[Unit]
Description=Kubernetes Scheduler Plugin
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/scheduler
ExecStart=/usr/bin/kube-scheduler \
$KUBE_LOGTOSTDERR \
$KUBE_LOG_LEVEL \
$KUBE_MASTER \
$KUBE_SCHEDULER_ARGS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
2. 配置文件/etc/kubernetes/scheduler
点击(此处)折叠或打开
###
# kubernetes scheduler config
# default config should be adequate
# Add your own!
KUBE_SCHEDULER_ARGS="--leader-elect=true --address=127.0.0.1"
3.启动 kube-scheduler
systemctl daemon-reload
systemctl enable kube-scheduler
systemctl start kube-scheduler
五:验证 master 节点功能
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