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kubernetes中Deployment配置

发布时间:2020-06-09 16:19:01 来源:亿速云 阅读:246 作者:元一 栏目:云计算
Deployment对象,顾名思义,是用于部署应用的对象。它使Kubernetes中最常用的一个对象,它为ReplicaSet和Pod的创建提供了一种声明式的定义方法,从而无需像前两篇文章中那样手动创建ReplicaSet和Pod对象(使用Deployment而不直接创建ReplicaSet是因为Deployment对象拥有许多ReplicaSet没有的特性,例如滚动升级和回滚)。

Deployment:
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
name: skx
spec:
replicas: 3
template:
metadata:
labels:
app: skx_server
spec:
containers:

  • name: httpd-test
    image: 192.168.1.10:5000/httpd:v1
    ports:
    • containerPort: 80

PS:注意,在Deployment资源对象中,可以添加Port字段,但此字段仅供用户查看,并不实际生效。
如下:
ports:

  • containerPort: 80

SERVICE

kind: Service
apiVersion: v1
metadata:
name: skx-svc
spec:
selector:
app: skx_server
ports:

  • protocol: TCP
    port: 80
    targetPort: 80

关联主机:
kind: Service
apiVersion: v1
metadata:
name: skx-svc
spec:
type: NodePort
selector:
app: skx_server
ports:

  • protocol: TCP
    port: 80
    targetPort: 80
    nodePort: 30123
    更改pod访问界面:
    [root@master ~]# kubectl exec -it skx-694cc5db89-45nvk /bin/bash
    root@skx-694cc5db89-45nvk:/usr/local/apache2# echo no.1 > htdocs/index.html
    root@skx-694cc5db89-45nvk:/usr/local/apache2# exit
    查看规则:
    [root@master ~]# iptables-save
    SNAT:Source NAT(源地址转换) DNAT:Destnation(目标地址转换) MASQ:动态的源地址转换
    Service实现的负载均衡使用的时iptables规则。IPVS
    10.107.64.232
    KUBE-SVC-QDLMDMK46RWAY7QJ

查找对应的防火墙规则
[root@master ~]# kubectl get svc
kubernetes中Deployment配置

[root@master ~]# iptables-save | grep 10.107.64.232
kubernetes中Deployment配置

[root@master ~]# iptables-save | grep KUBE-SVC-QDLMDMK46RWAY7QJ
kubernetes中Deployment配置

[root@master ~]# iptables-save | grep KUBE-SEP-YPYQNHI3JGSZCBF5
kubernetes中Deployment配置


[root@master ~]# kubectl get pod -o wide

kubernetes中Deployment配置
ip一样

回滚到指定版本:
删除之前创建的资源:
[root@master ~]# kubectl delete -f skx-svc.yaml
service "skx-svc" deleted
[root@master ~]# kubectl delete -f skx.yaml
deployment.extensions "skx" deleted

[root@master ~]# kubectl get deployments.
No resources found.
[root@master ~]# vim skx.yaml
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
name: skx
spec:
revisionHistoryLimit: 10   //添加
replicas: 3
template:
metadata:
labels:
app: skx_server
spec:
containers:

  • name: httpd-test
    image: 192.168.1.10:5000/httpd:v1
    ports:
    • containerPort: 80
      准备三个版本所使用的私有镜像,来模拟每次升级不同的镜像。
      [root@master ~]# mv skx.yaml skx1.yaml
      [root@master ~]# cp skx1.yaml skx2.yaml
      [root@master ~]# cp skx1.yaml skx3.yaml

[root@master ~]# vim skx1.yaml

15行:

    image: 192.168.1.10:5000/httpd:v1

[root@master ~]# vim skx2.yaml

15行:

    image: 192.168.1.10:5000/httpd:v2

[root@master ~]# vim skx3.yaml

15行:

    image: 192.168.1.10:5000/httpd:v3

此处3个yaml文件指定不同版本的镜像。
运行一个服务,并记录一个版本信息。
[root@master ~]# kubectl apply -f skx1.yaml --record
deployment.extensions/skx created
[root@master ~]# kubectl apply -f skx2.yaml --record
deployment.extensions/skx configured
[root@master ~]# kubectl apply -f skx3.yaml --record
deployment.extensions/skx configured
查看有哪些版本信息
[root@master ~]# kubectl rollout history deployment skx
deployment.extensions/skx
REVISION  CHANGE-CAUSE
1         kubectl apply --filename=skx1.yaml --record=true
2         kubectl apply --filename=skx2.yaml --record=true
3         kubectl apply --filename=skx3.yaml --record=true

运行并升级Deployment资源,并记录版本信息。
[root@master ~]# kubectl apply -f skx2.yaml --record
deployment.extensions/skx configured
此时可以运行一个关联的Service自愿去验证,升级是否成功
[root@master ~]# kubectl apply -f skx-svc.yaml
service/skx-svc created

[root@master ~]# kubectl get svc
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
httpd-svc    NodePort    10.97.81.154    <none>        80:31194/TCP   43h
kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP        5d17h
skx-svc      NodePort    10.96.174.199   <none>        80:30123/TCP   16s

[root@master ~]# curl 10.96.174.199
<h2>songkaixiong | test-web | httpd | v3<h2>

回滚到指定版本。
[root@master ~]# kubectl rollout undo deployment skx --to-revision=1
deployment.extensions/skx rolled back
curl 10.96.174.199
<h2>songkaixiong | test-web | httpd | v1<h2>

用label控制Pod的位置
给node03打上一个标签
[root@master ~]# kubectl label nodes node03 disk=ssd
node/node03 labeled
指定查看node03标签:
[root@master ~]# kubectl get nodes --show-labels | grep node03
node03   Ready    <none>   5d17h   v1.15.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,disk=ssd,kubernetes.io/arch=amd64,kubernetes.io/hostname=node03,kubernetes.io/os=linux
不指定查看所有节点标签:
[root@master ~]# kubectl get nodes --show-labels
NAME     STATUS   ROLES    AGE     VERSION   LABELS
master   Ready    master   5d17h   v1.15.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=master,kubernetes.io/os=linux,node-role.kubernetes.io/master=
node02   Ready    <none>   5d17h   v1.15.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node02,kubernetes.io/os=linux
node03   Ready    <none>   5d17h   v1.15.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,disk=ssd,kubernetes.io/arch=amd64,kubernetes.io/hostname=node03,kubernetes.io/os=linux
删除skx1资源:
[root@master ~]# kubectl delete  -f skx1.yaml
deployment.extensions "skx" deleted

[root@master ~]# kubectl delete  -f skx-svc.yaml
service "skx-svc" deleted

修改skx1.yaml配置文件:
[root@master ~]# vim skx1.yaml
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
name: skx
spec:
revisionHistoryLimit: 10
replicas: 3
template:
metadata:
labels:
app: skx_server
spec:
containers:

  • name: httpd-test
    image: 192.168.1.10:5000/httpd:v1
    ports:
    • containerPort: 80
      nodeSelector:             //添加节点选择器
      disk: ssd               //和标签内容一致
      [root@master ~]# kubectl apply -f skx1.yaml
      deployment.extensions/skx created
      三台都在node03上运行:
      [root@master ~]# kubectl get pod -o wide
      NAME                   READY   STATUS    RESTARTS   AGE   IP            NODE     NOMINATED NODE   READINESS GATES
      skx-55c4dc6dbc-7ztl9   1/1     Running   0          73s   10.244.2.27   node03   <none>           <none>
      skx-55c4dc6dbc-jsms7   1/1     Running   0          73s   10.244.2.28   node03   <none>           <none>
      skx-55c4dc6dbc-rfss7   1/1     Running   0          73s   10.244.2.26   node03   <none>           <none>

删除标签:
查看node03的标签:
[root@master ~]# kubectl get nodes --show-labels node03
NAME     STATUS   ROLES    AGE     VERSION   LABELS
node03   Ready    <none>   5d17h   v1.15.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,disk=ssd,kubernetes.io/arch=amd64,kubernetes.io/hostname=node03,kubernetes.io/os=linux
删除node03标签
[root@master ~]# kubectl label nodes node03 disk-
node/node03 labeled
再次查看node03标签:
[root@master ~]# kubectl get nodes --show-labels node03
NAME     STATUS   ROLES    AGE     VERSION   LABELS
node03   Ready    <none>   5d17h   v1.15.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node03,kubernetes.io/os=linux

删除资源:
[root@master ~]# kubectl delete deployments. skx
deployment.extensions "skx" deleted
重新生成:
[root@master ~]# kubectl apply -f skx1.yaml
deployment.extensions/skx unchanged
会找不到,起不来:
[root@master ~]# kubectl get pod -o wide
NAME                   READY   STATUS    RESTARTS   AGE   IP       NODE     NOMINATED NODE   READINESS GATES
skx-55c4dc6dbc-8rpl6   0/1     Pending   0          11s   <none>   <none>   <none>           <none>
skx-55c4dc6dbc-c2blp   0/1     Pending   0          11s   <none>   <none>   <none>           <none>
skx-55c4dc6dbc-zk7gw   0/1     Pending   0          11s   <none>   <none>   <none>           <none>

[root@master ~]# kubectl get pod -n kube-system
NAME                             READY   STATUS    RESTARTS   AGE
coredns-5c98db65d4-52cdm         1/1     Running   3          5d17h
coredns-5c98db65d4-sl96w         1/1     Running   4          5d17h
etcd-master                      1/1     Running   3          5d17h
kube-apiserver-master            1/1     Running   3          5d17h
kube-controller-manager-master   1/1     Running   3          5d17h
kube-flannel-ds-amd64-9vnsc      1/1     Running   4          5d17h
kube-flannel-ds-amd64-tdzrm      1/1     Running   2          5d17h
kube-flannel-ds-amd64-tvl2q      1/1     Running   5          5d17h
kube-proxy-492jr                 1/1     Running   2          5d17h
kube-proxy-gccnb                 1/1     Running   3          5d17h
kube-proxy-klznh                 1/1     Running   2          5d17h
kube-scheduler-master            1/1     Running   4          5d17h

查看master日志:
[root@master ~]# kubectl logs -n kube-system kube-scheduler-master
查看详细描述信息
[root@master ~]# kubectl describe pod skx-55c4dc6dbc-8rpl6
查看日志
[root@master ~]# kubectl logs -n kube-system kube-scheduler-master
查看kubectl日志
[root@master ~]#  less /var/log/messages | grep kubelet

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