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Kubernetes(k8s)之jenkins实现k8s应用的版本升级和回归,k8s集群部署项目

1、想要实现jenkins一键自动发布代码的话,还需要手动在k8s部署一下集群项目。首先,创建一个deloypment,如下所示:

1 [root@k8s-master ~]# kubectl run feiji --image=192.168.110.133:5000/feiji:v1 --replicas=2 --re
2 --record            --replicas=         --requests=         --request-timeout=  --restart=          
3 [root@k8s-master ~]# kubectl run feiji --image=192.168.110.133:5000/feiji:v1 --replicas=2 --record 
4 deployment "feiji" created
5 [root@k8s-master ~]# 

使用record参数进行记录,可以通过下面的命令进行查看,可以查看镜像版本,如下所示:

1 [root@k8s-master ~]# kubectl rollout history deployment feiji
2 deployments "feiji"
3 REVISION    CHANGE-CAUSE
4 1        kubectl run feiji --image=192.168.110.133:5000/feiji:v1 --replicas=2 --record
5 
6 [root@k8s-master ~]# 

可以通过命令进行查看,这个deploy已经启动了两个副本Pod,如下所示:

 1 [root@k8s-master ~]# kubectl get all
 2 NAME           DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
 3 deploy/feiji   2         2         2            2           2m
 4 
 5 NAME             CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
 6 svc/kubernetes   10.254.0.1   <none>        443/TCP   11h
 7 
 8 NAME                  DESIRED   CURRENT   READY     AGE
 9 rs/feiji-2742263606   2         2         2         2m
10 
11 NAME                        READY     STATUS    RESTARTS   AGE
12 po/feiji-2742263606-0w2cz   1/1       Running   0          2m
13 po/feiji-2742263606-ltdvr   1/1       Running   0          2m
14 [root@k8s-master ~]# kubectl get all -o wide
15 NAME           DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
16 deploy/feiji   2         2         2            2           2m
17 
18 NAME             CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE       SELECTOR
19 svc/kubernetes   10.254.0.1   <none>        443/TCP   11h       <none>
20 
21 NAME                  DESIRED   CURRENT   READY     AGE       CONTAINER(S)   IMAGE(S)                        SELECTOR
22 rs/feiji-2742263606   2         2         2         2m        feiji          192.168.110.133:5000/feiji:v1   pod-template-hash=2742263606,run=feiji
23 
24 NAME                        READY     STATUS    RESTARTS   AGE       IP            NODE
25 po/feiji-2742263606-0w2cz   1/1       Running   0          2m        172.16.78.4   k8s-node3
26 po/feiji-2742263606-ltdvr   1/1       Running   0          2m        172.16.31.6   k8s-node2
27 [root@k8s-master ~]# 

此时项目还不能被外界所访问,还需要暴漏一个端口号,如下所示:

 1 [root@k8s-master ~]# kubectl expose deployment feiji --port=80 --type=NodePort
 2 service "feiji" exposed
 3 [root@k8s-master ~]# kubectl get all
 4 NAME           DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
 5 deploy/feiji   2         2         2            2           4m
 6 
 7 NAME             CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
 8 svc/feiji        10.254.23.13   <nodes>       80:32283/TCP   7s
 9 svc/kubernetes   10.254.0.1     <none>        443/TCP        11h
10 
11 NAME                  DESIRED   CURRENT   READY     AGE
12 rs/feiji-2742263606   2         2         2         4m
13 
14 NAME                        READY     STATUS    RESTARTS   AGE
15 po/feiji-2742263606-0w2cz   1/1       Running   0          4m
16 po/feiji-2742263606-ltdvr   1/1       Running   0          4m
17 [root@k8s-master ~]# kubectl get all -o wide
18 NAME           DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
19 deploy/feiji   2         2         2            2           4m
20 
21 NAME             CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE       SELECTOR
22 svc/feiji        10.254.23.13   <nodes>       80:32283/TCP   9s        run=feiji
23 svc/kubernetes   10.254.0.1     <none>        443/TCP        11h       <none>
24 
25 NAME                  DESIRED   CURRENT   READY     AGE       CONTAINER(S)   IMAGE(S)                        SELECTOR
26 rs/feiji-2742263606   2         2         2         4m        feiji          192.168.110.133:5000/feiji:v1   pod-template-hash=2742263606,run=feiji
27 
28 NAME                        READY     STATUS    RESTARTS   AGE       IP            NODE
29 po/feiji-2742263606-0w2cz   1/1       Running   0          4m        172.16.78.4   k8s-node3
30 po/feiji-2742263606-ltdvr   1/1       Running   0          4m        172.16.31.6   k8s-node2
31 [root@k8s-master ~]# 

此时访问地址,http://192.168.110.133:32283/。此项目是可以进行访问的。

1 [root@k8s-master ~]# curl 192.168.110.133:32283 | grep 'feiji'
2   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
3                                  Dload  Upload   Total   Spent    Left  Speed
4 100  1081  100  1081    0     0   216k      0 --:--:-- --:--:-- --:--:--  263k
5 [root@k8s-master ~]# 

此时使用Jenkins实现k8s里面的项目版本更新,k8s中版本升级和回滚,首先实现手动实现项目版本升级和回滚。这里实现版本的升级并查看历史版本,如下所示:

手动做版本升级的时候,Vx这个版本和之前的不能重复的,不然回造成升级版本失败的,需要注意。

1 [root@k8s-master ~]# kubectl set image deploy feiji feiji=192.168.110.133:5000/feiji:v3
2 deployment "feiji" image updated
3 [root@k8s-master ~]# kubectl rollout history deployment feiji
4 deployments "feiji"
5 REVISION    CHANGE-CAUSE
6 1        kubectl run feiji --image=192.168.110.133:5000/feiji:v1 --replicas=2 --record
7 2        kubectl set image deploy feiji feiji=192.168.110.133:5000/feiji:v3
8 
9 [root@k8s-master ~]# 

这里做版本的回滚到上一个版本,并查看历史版本,如下所示:

1 [root@k8s-master ~]# kubectl rollout undo deployment feiji
2 deployment "feiji" rolled back
3 [root@k8s-master ~]# kubectl rollout history deployment feiji
4 deployments "feiji"
5 REVISION    CHANGE-CAUSE
6 2        kubectl set image deploy feiji feiji=192.168.110.133:5000/feiji:v3
7 3        kubectl run feiji --image=192.168.110.133:5000/feiji:v1 --replicas=2 --record
8 
9 [root@k8s-master ~]# 

可以回滚到指定的版本,如下所示:

1 [root@k8s-master ~]# kubectl rollout undo deployment feiji --to-revision=1

 

2、上面是手动做的版本更新,下面做自动版本的更新,首先需要在Jenkins进行配置。之前是直接将镜像推送到私有仓库就结束了,现在要使用kubectl进行更新。
由于k8s的Node节点不能执行kubectl set image deploy feiji feiji=192.168.110.133:5000/feiji:v$BUILD_ID,是执行不成功的,如果需要远程执行k8s的命令,先测试一下,-s执行api-server的命令,如下所示:

1 [root@k8s-node3 feiji]# kubectl -s 192.168.110.133:8080 get nodes 
2 NAME         STATUS    AGE
3 k8s-master   Ready     27d
4 k8s-node2    Ready     27d
5 k8s-node3    Ready     27d
6 [root@k8s-node3 feiji]# 

此时为了方便观察,修改界面代码,方便观察效果,模拟提交代码,如下所示:

 1 [root@k8s-node3 feiji]# vim index.html 
 2 [root@k8s-node3 feiji]# git add .
 3 [root@k8s-node3 feiji]# git commit -m '2rd update feiji!'
 4 [master f2722e1] 2rd update feiji!
 5  1 file changed, 3 insertions(+), 3 deletions(-)
 6 [root@k8s-node3 feiji]# git push -u origin master 
 7 Username for 'http://192.168.110.135': root
 8 Password for 'http://root@192.168.110.135': 
 9 Counting objects: 5, done.
10 Delta compression using up to 2 threads.
11 Compressing objects: 100% (3/3), done.
12 Writing objects: 100% (3/3), 341 bytes | 0 bytes/s, done.
13 Total 3 (delta 2), reused 0 (delta 0)
14 To http://192.168.110.135/root/feiji.git
15    caba46a..f2722e1  master -> master
16 Branch master set up to track remote branch master from origin.
17 [root@k8s-node3 feiji]# 

此时点击立即构建,然后观察是否已经正常升级了,如下所示:

然后查看控制台输出,发现已经更新了,如下所示:

此时访问地址,http://192.168.110.133:32283/。此项目是可以进行访问的。如果想要回滚,可以在Jenkins上面创建一个任务,然后在shell里面写好回滚的命令就行了额。

 

posted on 2020-07-15 13:08  别先生  阅读(158)  评论(0编辑  收藏