Jenkins配置从节点问题：ssh slave known_hosts [SSH]与Slave JVM has terminated. Exit code=126

àì夳堔傛蜴生んèń 2022-05-12 07:10 864阅读 0赞

### 第一个问题 ： `/var/jenkins_home/.ssh/known_hosts No Known` ###

### 第二个问题：jenkins Slave JVM has terminated. Exit code=126 ###

First  :原因：jenkins master 通过ssh登录slave失败

背景：已经安全`ant`，配置`java`环境OK

仔细看日志，发现错误信息：   
`/var/jenkins_home/.ssh/known_hosts [SSH] No Known Hosts file was found at /var/jenkins_home/.ssh/known_hosts. Please ensure one is created at this path and that Jenkins can read it.`

Jenkins用户下，操作如下：

64  ssh-keygen
       65  cd .ssh
       69  cat id_rsa.pub > authorized_keys
       70  chmod 700 authorized_keys

Jenkins master Web界面操作：

### step 1 ###

![70][]

选项：Host Key Verification Strategy （主机密钥验证策略）修改；ssh 连接默认22；如果修改port点击高级

[参考链接][Link 1]

"Known Hosts file verification strategy" 更改为 "Manually trusted key verification strategy".
    
    CONFIGURE AGENT -> LAUNCH METHOD -> Manually trusted key verification strategy - > SAVE.

### step 2 ###

远程工作目录 ，配置为 `/root/.jenkins`，此处配置为了让master能找到slave的`.ssh`目录。

至此，问题解决。

![70 1][]

\---------------------------------------------------------------------------

第二个问题：出现现象

# [jenkins slave启动报错：hudson.util.IOException2: Slave JVM has terminated. Exit code=126][jenkins slave_hudson.util.IOException2_ Slave JVM has terminated. Exit code_126] #

正常的配置如下

![70 2][]

分析下图原因：
    因为java-path(JDK路径) ，这个报错就是由于路径设置(没精确到java指令)错误的填写。此处java路径 不能仅仅指定JAVA_HOME
    还要精确到java指令位置。如果只是到JAVA_HOME就会出现 bash: /usr/java/jdk1.8.0_101: is a directory
    Click the Advanced button under the Launch Method section of the slave configuration and make sure JavaPath is set to /usr/java/jdk1.6.0_29/bin/java. It has to be the full path to the executable, not the JAVA_HOME location.如图示我从节点的jdk配置

[root@test-prod-01 /usr/local]$ echo $JAVA_HOME
    /usr/local/jdk/jdk1.8.0_171
    [root@test-prod-01 /usr/local]$ cd /usr/local/jdk/jdk1.8.0_171/bin/

附上报错日志:

添加mac slave节点报错如下：
    Expanded the channel window size to 4MB
      [18/09/15 19:11:54] [SSH] Starting slave process: cd "/test/app/abc/slavetest" && /usr/java        /jdk1.8.0_101 -XX:MaxPermSize=2048m -Xmx2048m -jar slave.jar
      bash: /usr/java/jdk1.8.0_101: is a directory
      hudson.util.IOException2: Slave JVM has terminated. Exit code=126
        at hudson.plugins.sshslaves.SSHLauncher.startSlave(SSHLauncher.java:953)
        at hudson.plugins.sshslaves.SSHLauncher.access$400(SSHLauncher.java:133)
        at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:711)
        at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:696)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
      Caused by: java.io.EOFException: unexpected stream termination
        at hudson.remoting.ChannelBuilder.negotiate(ChannelBuilder.java:200)
        at hudson.remoting.Channel.<init>(Channel.java:419)
        at hudson.remoting.Channel.<init>(Channel.java:398)
        at hudson.remoting.Channel.<init>(Channel.java:394)
        at hudson.remoting.Channel.<init>(Channel.java:383)
        at hudson.remoting.Channel.<init>(Channel.java:375)
        at hudson.slaves.SlaveComputer.setChannel(SlaveComputer.java:344)
        at hudson.plugins.sshslaves.SSHLauncher.startSlave(SSHLauncher.java:945)
        ... 7 more  
     [18/09/15 19:11:54] Launch failed - cleaning up connection
      [18/09/15 19:11:54] [SSH] Connection closed.

java路径指定好之后；问题完美解决如图

![70 3][]

![70 4][]

ps:参考文章[https://stackoverflow.com/questions/26808494/jenkins-ssh-slave-configuration][https_stackoverflow.com_questions_26808494_jenkins-ssh-slave-configuration]

[70]: /images/20220512/4b0a2fd693a4401bac3cdd67fde59a9b.png
[Link 1]: https://stackoverflow.com/questions/44441935/cant-connect-to-jenkins-slave-no-known-hosts-file-was-found-at-var-jenkins-hom
[70 1]: /images/20220512/6a2fa589475c48a8924790f2ea98da78.png
[jenkins slave_hudson.util.IOException2_ Slave JVM has terminated. Exit code_126]: https://www.cnblogs.com/wnfindbug/p/jenkins%E6%8A%A5%E9%94%99.html
[70 2]: /images/20220512/eb285ee598304f9cb292ad1174e387c0.png
[70 3]: /images/20220512/e2574af61c464a94b71f71a4b2394b65.png
[70 4]: /images/20220512/1a750ec4dc1d4a73ac4806ea4d2514bb.png
[https_stackoverflow.com_questions_26808494_jenkins-ssh-slave-configuration]: https://stackoverflow.com/questions/26808494/jenkins-ssh-slave-configuration