jenkins实现k8s持续更新

一、安装jdk

[root@k8s-node-2 opt]# rpm -ivh jdk-8u102-linux-x64.rpm

二、安装tomcat

[root@k8s-node-2 opt]# mkdir app
[root@k8s-node-2 opt]# tar xf apache-tomcat-8.0.27.tar.gz -C app/

三、删除默认站点下的文件,文件改名

[root@k8s-node-2 opt]# rm -rm app/apache-tomcat-8.0.27/webapps/*
[root@k8s-node-2 opt]# mv jenkins.war app/apache-tomcat-8.0.27/webapps/ROOT.war

四、解压jenkin-data软件包

[root@k8s-node-2 opt]# tar xf jenkin-data.tar.gz -C /root/
[root@k8s-node-2 opt]# ls /root/.jenkins/
config.xml                                     jenkins.install.InstallUtil.lastExecVersion     nodes                     updates
credentials.xml                                jenkins.install.UpgradeWizard.state             plugins                   userContent
fingerprints                                   jenkins.model.JenkinsLocationConfiguration.xml  queue.xml                 users
hudson.model.UpdateCenter.xml                  jenkins.telemetry.Correlator.xml                queue.xml.bak             workflow-libs
hudson.plugins.git.GitTool.xml                 jobs                                            secret.key                workspace
identity.key.enc                               logs                                            secret.key.not-so-secret
jenkins.install.InstallUtil.installingPlugins  nodeMonitors.xml                                secrets

五、启动tomcat，也就启动了jenkins

[root@k8s-node-2 opt]# app/apache-tomcat-8.0.27/bin/startup.sh 
Using CATALINA_BASE:   /opt/app/apache-tomcat-8.0.27
Using CATALINA_HOME:   /opt/app/apache-tomcat-8.0.27
Using CATALINA_TMPDIR: /opt/app/apache-tomcat-8.0.27/temp
Using JRE_HOME:        /usr
Using CLASSPATH:       /opt/app/apache-tomcat-8.0.27/bin/bootstrap.jar:/opt/app/apache-tomcat-8.0.27/bin/tomcat-juli.jar
Tomcat started.

六、访问jenkins 10.0.0.13:8080 admin 123456

七、新建一个任务yinliao，确定

八、general里选参数化构建过程，定义version变量，方便升级失败回滚；

源码管理git，Repositories：码云url，添加：输入gitee用户名、密码

构建：执行shell，输入自动构建镜像的命令，然后保存

docker build -t yiliao:$version . #构建镜像
docker tag yiliao:v1 10.0.0.11:5000/yiliao:$version #打标签
docker push 10.0.0.11:5000/yiliao:$version #推送私有仓库
kubectl -s 10.0.0.11:8080 set image -n yiliao deployment yiliao yiliao=10.0.0.11:5000/yiliao:$version #更新k8s中打deployment镜像版本

九、点击构建  Build with Parameters，jenkins把码云上的代码拉到本地目录

[root@k8s-node-2 opt]# ls /root/.jenkins/workspace/yiliao/
about.html           article.html         css/                 images/              product_detail.html  
album.html           comment.html         Dockerfile           index.html           product.html         
article_detail.html  contact.html         .git/                js/                  README.md 

十、创建namespace，一个项目一个namespace

[root@k8s-master opt]# kubectl create namespace yiliao
namespace "yiliao" created

十一、创建deployment资源

[root@k8s-master opt]# kubectl run -n yiliao yiliao --image=10.0.0.11:5000/yiliao:v1 --replicas=2
deployment "yiliao" created

十二、创建svc，暴露端口

十三、查看项目，已经在k8s中运行起来了

[root@k8s-master opt]# kubectl get all -n yiliao 
NAME            DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deploy/yiliao   2         2         2            2           4m

NAME         CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
svc/yiliao   10.254.146.161   <nodes>       80:44218/TCP   1m

NAME                  DESIRED   CURRENT   READY     AGE
rs/yiliao-253796219   2         2         2         4m

NAME                        READY     STATUS    RESTARTS   AGE
po/yiliao-253796219-rplt0   1/1       Running   0          4m
po/yiliao-253796219-w3tt0   1/1       Running   0          4m

[root@k8s-master opt]# kubectl expose -n yiliao deployment yiliao --port=80 --target-port=80 --type=NodePort
service "yiliao" exposed

十四、版本更新，输入版本信息，自动构建镜像

jenkins立即构建过程总结：

1.拉取代码

2.构建docker镜像

3.上传镜像到私有仓库

4.远程控制k8s更新deployment

十五、回滚shell命令

kubectl -s 10.0.0.11:8080 rollout undo -n yiliao deployment yiliao

指定版本信息，也可以完成回滚

kubectl -s 10.0.0.11:8080 set image -n yiliao deployment yiliao yiliao=10.0.0.11:5000/yiliao:$version