jenkins 节点上下线通知 jenkins添加节点

添加node节点前配置

开始添加node节点

 在添加node节点时，填好“名称”、“描述”、“执行器数量”、“远程工作目录”、“标签”、“用法(一般默认)”、“启动方式(根据情况)”，完成后保存。

这时node1节点还是未在线状态，点击“node1”名称会有节点连接Jenkins的方法。

注意： 这里必须用--user root 用户进入容器才可以创建工作目录，默认进入是jenkins用户，会提示权限不足。

[root@localhost ~]# docker ps -a    //容器运行时需要映射代理连接端口50000CONTAINER ID        IMAGE                  COMMAND                  CREATED             STATUS                        PORTS                                              NAMES1dad787d6f46        myjenkins:v1           "/sbin/tini -- /usr/…"   38 minutes ago      Up 11 minutes                 0.0.0.0:8080->8080/tcp, 0.0.0.0:50000->50000/tcp   myjenkins[root@localhost ~]# docker exec -it --user root jenkins /bin/bashroot@367402ec96bf:/# mkdir -p /opt/jenkins    //创建工作目录root@367402ec96bf:/# cd /opt/jenkins/root@367402ec96bf:/opt/jenkins# wget http://192.168.1.8:8080/jnlpJars/agent.jarroot@367402ec96bf:/opt/jenkins# lsagent.jarroot@367402ec96bf:/opt/jenkins# java -jar agent.jar -jnlpUrl http://192.168.1.8:8080/computer/node1/slave-agent.jnlp -secret 90e0e5a0d61f67d551d029a22584632fb96f314acf1f3789372adbb747e81b11 -workDir "/opt/jenkins"......Nov 16, 2020 6:19:14 AM hudson.remoting.jnlp.Main$CuiListener statusINFO: Trying protocol: JNLP4-connectNov 16, 2020 6:19:14 AM hudson.remoting.jnlp.Main$CuiListener statusINFO: Remote identity confirmed: 33:34:ca:16:46:58:d8:12:94:38:4b:eb:ee:33:a9:4cNov 16, 2020 6:19:14 AM hudson.remoting.jnlp.Main$CuiListener statusINFO: Connected    //连接成功

报错

 如果在容器中下载好agent.jar后，执行节点连接命令的时候出现下面的错误：

 WARNING: Connection refused (Connection refused)

root@367402ec96bf:/opt/jenkins# java -jar agent.jar -jnlpUrl http://192.168.1.8:8080/computer/node1/slave-agent.jnlp -secret 5cb49ff710c0dde742725fcb82dc2e8ccf4f612819e2b6889cfcb93207fc734a -workDir "/opt/jenkins"......WARNING: Connection refused (Connection refused)Nov 16, 2020 3:57:42 AM hudson.remoting.jnlp.Main$CuiListener errorSEVERE: http://192.168.1.8:8080/ provided port:50000 is not reachablejava.io.IOException: http://192.168.1.8:8080/ provided port:50000 is not reachable        at org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver.resolve(JnlpAgentEndpointResolver.java:314)        at hudson.remoting.Engine.innerRun(Engine.java:693)        at hudson.remoting.Engine.run(Engine.java:518)

解决：

 1.查看正在运行的容器是否已经映射了前面在Jenkins管理界面设置中的“全局安全配置”里配置的代理指定端口(详情见顶图)

[root@localhost ~]# docker ps -aCONTAINER ID        IMAGE                  COMMAND                  CREATED             STATUS                        PORTS                                              NAMES1dad787d6f46        myjenkins:v1           "/sbin/tini -- /usr/…"   38 minutes ago      Up 11 minutes                 0.0.0.0:8080->8080/tcp, 0.0.0.0:50000->50000/tcp   myjenkins

 2.没有映射代理端口需要重新映射才能正常连接，有下面两种方法：

• 2.1 将当前已经运行的容器通过docker commit命令提交为一个镜像，然后重新执行docker run命令添加完整的端口映射。(推荐)

[root@localhost ~]# docker stop jenkins[root@localhost ~]# docker commit -m "my jenkins" 367402ec96bf myjenkins:v1[root@localhost ~]# docker imagesREPOSITORY             TAG                 IMAGE ID            CREATED             SIZEmyjenkins              v1                  5349fdcc8533        7 minutes ago       662MBjenkinszh/jenkins-zh   latest              2cb4cce6db0a        5 months ago        656MB[root@localhost ~]# docker run -itd --name=myjenkins -p 8080:8080 -p 50000:50000 myjenkins:v1[root@localhost ~]# docker psCONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                                              NAMES1dad787d6f46        myjenkins:v1        "/sbin/tini -- /usr/…"   5 seconds ago       Up 4 seconds        0.0.0.0:8080->8080/tcp, 0.0.0.0:50000->50000/tcp   myjenkins

 进入浏览器访问Jenkins页面，重新完成入门步骤后进入Jenkins管理界面首页，按照本教程从头开始进行“添加node节点前配置”、“开始添加node节点”步骤，进行至“节点连接Jenkins方式”时，按照下面步骤重新操作即可。

[root@localhost ~]# docker exec -it --user root myjenkins /bin/bashroot@1dad787d6f46:/# cd /opt/jenkins/root@1dad787d6f46:/opt/jenkins# rm -rf *    //删除之前的文件root@1dad787d6f46:/opt/jenkins# wget http://192.168.1.8:8080/jnlpJars/agent.jar  //重新复制连接代理的agent.jar链接root@1dad787d6f46:/opt/jenkins# lsagent.jarroot@1dad787d6f46:/opt/jenkins# java -jar agent.jar -jnlpUrl http://192.168.1.8:8080/computer/node1/slave-agent.jnlp -secret 90e0e5a0d61f67d551d029a22584632fb96f314acf1f3789372adbb747e81b11 -workDir "/opt/jenkins"......INFO: Agent discovery successful  Agent address: 192.168.1.8  Agent port:    50000  Identity:      33:34:ca:16:46:58:d8:12:94:38:4b:eb:ee:33:a9:4cNov 16, 2020 6:19:14 AM hudson.remoting.jnlp.Main$CuiListener statusINFO: HandshakingNov 16, 2020 6:19:14 AM hudson.remoting.jnlp.Main$CuiListener statusINFO: Connecting to 192.168.1.8:50000Nov 16, 2020 6:19:14 AM hudson.remoting.jnlp.Main$CuiListener statusINFO: Trying protocol: JNLP4-connectNov 16, 2020 6:19:14 AM hudson.remoting.jnlp.Main$CuiListener statusINFO: Remote identity confirmed: 33:34:ca:16:46:58:d8:12:94:38:4b:eb:ee:33:a9:4cNov 16, 2020 6:19:14 AM hudson.remoting.jnlp.Main$CuiListener statusINFO: Connected

• 2.2 通过配置文件修改已经运行的docker容器端口映射

优化

 在上面代理连接Jenkins的时候，可以看到我们是直接通过执行命令连接，这种方式会一直占用系统终端，这时我们可以通过编写一个脚本来实现不占用终端一直运行脚本达到代理连接Jenkins的效果。(在容器中可以通过宿主机写好脚本后，与jenkins容器共享脚本目录，这样容器中也可以直接访问脚本目录执行脚本)

nohup 不挂断地运行命令 & 在后台运行 (一般这两个一起用) nohup command &

[root@localhost jenkins]# vim start.sh#!/bin/bashnohup java -jar agent.jar -jnlpUrl http://192.168.1.8:8080/computer/node1/slave-agent.jnlp -secret 90e0e5a0d61f67d551d029a22584632fb96f314acf1f3789372adbb747e81b11 -workDir "/opt/jenkins" &(可以通过commit新镜像重新执行docker run 映射端口跟共享目录)# sh start.sh# ps -aux | grep start.sh    //通过ps查看后台运行的脚本root      15269  0.0  0.0 112720   996 pts/0    S+   15:13   0:00 grep --color=auto start.sh# tail -f nohup.out    //查看脚本后台执行启动日志十一月 16, 2020 3:10:11 下午 hudson.remoting.jnlp.Main$CuiListener status信息: Handshaking十一月 16, 2020 3:10:11 下午 hudson.remoting.jnlp.Main$CuiListener status信息: Connecting to 192.168.1.8:50000十一月 16, 2020 3:10:11 下午 hudson.remoting.jnlp.Main$CuiListener status信息: Trying protocol: JNLP4-connect十一月 16, 2020 3:10:12 下午 hudson.remoting.jnlp.Main$CuiListener status信息: Remote identity confirmed: 33:34:ca:16:46:58:d8:12:94:38:4b:eb:ee:33:a9:4c十一月 16, 2020 3:10:12 下午 hudson.remoting.jnlp.Main$CuiListener status信息: Connected

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