【5】K8S_Deployment
创始人
2024-05-11 12:18:03
0次
目录
1、Deployment作用
2、deployment的冗余能力
3、deployment的多副本部署
4、deployment的扩缩容
5、deployment的自愈能力
6、滚动更新
7、版本回退
1、Deployment作用
控制Pod，使Pod拥有多副本，自愈，扩缩容等能力
2、deployment的冗余能力
创建一个deployment的pod用delete删除不了，下面案例两种创建pod的不通
[root@master ~]# kubectl run nginx --image=nginx
pod/nginx created
[root@master ~]# kubectl create deployment myginx01 --image=nginx
deployment.apps/myginx01 created[root@master ~]# kubectl delete pod nginx
pod "nginx" deleted[root@master ~]# kubectl delete pod myginx01-5c9d6dbf77-k75d5
pod "myginx01-5c9d6dbf77-k75d5" deleted
[root@master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
myginx01-5c9d6dbf77-k8f8x 1/1 Running 0 2m45s
#也可以在开一个窗口看一下效果
[root@master ~]# watch -n 1 kubectl get pod 只有把delopment删除以后才可以删除pod
[root@master ~]# kubectl delete deploy myginx01
deployment.apps "myginx01" deleted
[root@master ~]# kubectl get pod
No resources found in default namespace.
3、deployment的多副本部署
案例走起：
[root@master ~]# kubectl create deploy mynginx --image=nginx --replicas=3
deployment.apps/mynginx created[root@master ~]# kubectl get pod -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
mynginx-5b686ccd46-4w2nm 1/1 Running 0 36s 192.168.196.146 node01
mynginx-5b686ccd46-cxtjn 1/1 Running 0 36s 192.168.196.144 node01
mynginx-5b686ccd46-j5xpq 1/1 Running 0 36s 192.168.196.145 node01
[root@master ~]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
mynginx 3/3 3 3 92s
也可以在bashboard上部署
用yaml部署
先创建一个yaml
apiVersion: apps/v1
kind: Deployment
metadata:labels:app: my-depname: my-dep
spec:replicas: 3selector:matchLabels:app: my-deptemplate:metadata:labels:app: my-depspec:containers:- image: nginxname: nginx[root@master ~]# kubectl apply -f pod.yaml
deployment.apps/my-dep created
[root@master ~]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
my-dep 2/3 3 2 30s
mynginx 5/5 5 5 16m
[root@master ~]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
my-dep 3/3 3 3 35s
mynginx 5/5 5 5 16m
[root@master ~]#
4、deployment的扩缩容
kubectl scale --replicas=5 deployment/my-dep
kubectl edit deploy my-dep
案例走起：
[root@master ~]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
my-dep 3/3 3 3 7m17s
[root@master ~]# kubectl scale deploy/my-dep --replicas=5
deployment.apps/my-dep scaled
[root@master ~]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
my-dep 5/5 5 5 8m10s
[root@master ~]# kubectl scale deploy/my-dep --replicas=2
deployment.apps/my-dep scaled
[root@master ~]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
my-dep 2/2 2 2 8m42s
[root@master ~]# kubectl edit deploy my-dep
deployment.apps/my-dep edited
[root@master ~]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
my-dep 2/3 3 2 11m
5、deployment的自愈能力
案例走起：
在node01节点上停止一个容器看效果
[root@node01 ~]# docker ps |grep my-dep-5b7868d854-dgrt4
14744aac665a nginx "/docker-entrypoint.…" 13 minut8s_nginx_my-dep-5b7868d854-dgrt4_default_bc8be424-2226-44f3-8dc5-49b08d1ef3fe_0
96beef3e2dba registry.aliyuncs.com/google_containers/pause:3.2 "/pause" 13 minut8s_POD_my-dep-5b7868d854-dgrt4_default_bc8be424-2226-44f3-8dc5-49b08d1ef3fe_0
[root@node01 ~]# docker ps |grep my-dep-5b7868d854-dgrt4
14744aac665a nginx "/docker-entrypoint.…" 14 minutdgrt4_default_bc8be424-2226-44f3-8dc5-49b08d1ef3fe_0
96beef3e2dba registry.aliyuncs.com/google_containers/pause:3.2 "/pause" 14 minutrt4_default_bc8be424-2226-44f3-8dc5-49b08d1ef3fe_0
[root@node01 ~]# docker stop 14744aac665a
14744aac665a
[root@node01 ~]#
发现node01节点的容器重启了一次
[root@master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
my-dep-5b7868d854-dgrt4 1/1 Running 1 16m
my-dep-5b7868d854-lq6mz 1/1 Running 0 27m
my-dep-5b7868d854-pgp9n 1/1 Running 0 27m
现在我们把node01服务器关机看效果
[root@master ~]# kubectl get pod -w
NAME READY STATUS RESTARTS AGE
my-dep-5b7868d854-dgrt4 1/1 Running 1 20m
my-dep-5b7868d854-lq6mz 1/1 Running 0 31m
my-dep-5b7868d854-pgp9n 1/1 Running 0 31m
my-dep-5b7868d854-dgrt4 1/1 Terminating 1 25m
my-dep-5b7868d854-6qzt6 0/1 Pending 0 0s
my-dep-5b7868d854-6qzt6 0/1 Pending 0 0s
my-dep-5b7868d854-6qzt6 0/1 ContainerCreating 0 0s
my-dep-5b7868d854-6qzt6 0/1 ContainerCreating 0 1s
my-dep-5b7868d854-6qzt6 1/1 Running 0 2s
[root@master ~]# kubectl get pod -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
my-dep-5b7868d854-6qzt6 1/1 Running 0 2m18s 192.168.140.81 node02
my-dep-5b7868d854-dgrt4 1/1 Terminating 1 27m 192.168.196.154 node01
my-dep-5b7868d854-lq6mz 1/1 Running 0 38m 192.168.140.80 node02
my-dep-5b7868d854-pgp9n 1/1 Running 0 38m 192.168.140.79 node02
6、滚动更新
以yaml的方式查看pod
[root@master ~]# kubectl get deploy my-dep -o yaml
...spec:containers:- image: nginximagePullPolicy: Alwaysname: nginx
...现在我们要变更镜像的版本
[root@master ~]# kubectl set image deploy/my-dep nginx=nginx:1.16.1 --record
deployment.apps/my-dep image updated查看效果：
[root@master ~]# kubectl get pod -w
NAME READY STATUS RESTARTS AGE
my-dep-5b7868d854-6qzt6 1/1 Running 0 10m
my-dep-5b7868d854-lq6mz 1/1 Running 0 46m
my-dep-5b7868d854-pgp9n 1/1 Running 0 46m
my-dep-6b48cbf4f9-x25jn 0/1 ContainerCreating 0 23s
my-dep-6b48cbf4f9-x25jn 1/1 Running 0 50s
my-dep-5b7868d854-6qzt6 1/1 Terminating 0 10m
my-dep-6b48cbf4f9-gfhnf 0/1 Pending 0 0s
my-dep-6b48cbf4f9-gfhnf 0/1 Pending 0 0s
my-dep-6b48cbf4f9-gfhnf 0/1 ContainerCreating 0 0s
my-dep-5b7868d854-6qzt6 1/1 Terminating 0 10m
my-dep-6b48cbf4f9-gfhnf 0/1 ContainerCreating 0 1s
my-dep-5b7868d854-6qzt6 0/1 Terminating 0 10m
my-dep-6b48cbf4f9-gfhnf 1/1 Running 0 2s
my-dep-5b7868d854-lq6mz 1/1 Terminating 0 46m
my-dep-6b48cbf4f9-ztzzw 0/1 Pending 0 0s
my-dep-6b48cbf4f9-ztzzw 0/1 Pending 0 0s
my-dep-6b48cbf4f9-ztzzw 0/1 ContainerCreating 0 0s
my-dep-5b7868d854-lq6mz 1/1 Terminating 0 46m
my-dep-6b48cbf4f9-ztzzw 0/1 ContainerCreating 0 1s
my-dep-5b7868d854-lq6mz 0/1 Terminating 0 46m
my-dep-5b7868d854-6qzt6 0/1 Terminating 0 10m
my-dep-5b7868d854-6qzt6 0/1 Terminating 0 10m
my-dep-5b7868d854-lq6mz 0/1 Terminating 0 46m
my-dep-5b7868d854-lq6mz 0/1 Terminating 0 46m
my-dep-6b48cbf4f9-ztzzw 1/1 Running 0 17s
my-dep-5b7868d854-pgp9n 1/1 Terminating 0 46m
my-dep-5b7868d854-pgp9n 1/1 Terminating 0 46m
my-dep-5b7868d854-pgp9n 0/1 Terminating 0 46m
my-dep-5b7868d854-pgp9n 0/1 Terminating 0 47m
my-dep-5b7868d854-pgp9n 0/1 Terminating 0 47m
[root@master ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
my-dep-6b48cbf4f9-gfhnf 1/1 Running 0 2m41s 192.168.196.158 node01
my-dep-6b48cbf4f9-x25jn 1/1 Running 0 3m31s 192.168.196.157 node01
my-dep-6b48cbf4f9-ztzzw 1/1 Running 0 2m39s 192.168.196.159 node01
[root@master ~]#
[root@master ~]# kubectl get deploy -o yaml...spec:containers:- image: nginx:1.16.1imagePullPolicy: Alwaysname: nginxresources: {}terminationMessagePath: /dev/termination-logterminationMessagePolicy: File
7、版本回退
查看历史命令
[root@master ~]# kubectl rollout history deployment/my-dep
deployment.apps/my-dep
REVISION CHANGE-CAUSE
1
2 kubectl set image deploy/my-dep nginx=nginx:1.16.1 --record=true
设置回退到1的时候：
[root@master ~]# kubectl rollout undo deploy/my-dep --to-revision=1
deployment.apps/my-dep rolled back参考一下镜像版本：
[root@master ~]# kubectl get deploy/my-dep -o yaml |grep image{"apiVersion":"apps/v1","kind":"Deployment","metadata":{"annotations":{},"labels":{"app":"my-dep"},"name":"my-dep","namespace":"default"},"spec":{"replicas":3,"selector":{"matchLabels":{"app":"my-dep"}},"template":{"metadata":{"labels":{"app":"my-dep"}},"spec":{"containers":[{"image":"nginx","name":"nginx"}]}}}}f:imagePullPolicy: {}f:image: {}- image: nginximagePullPolicy: Always
Kubernetes-核心概念-其他工作负载
Deployment: 无状态应用部署，比如微服务，提供多副本等功能
StatefulSet:有状态应用部署，比如redis，提供稳定的存储、网络等功能
DaemonSet:守护型应用部署，比如日志收集组件，在每个机器都运行一份
Job/CronJob:定时任务部署，比如垃圾清理组件，可以在指定时间运行
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