Jenkins配置從節點問題：ssh slave known_hosts [SSH]與Slave JVM has terminated. Exit code=126

第一個問題 ： /var/jenkins_home/.ssh/known_hosts No Known

第二個問題：jenkins Slave JVM has terminated. Exit code=126

First  :原因：jenkins master 通過ssh登錄slave失敗

背景：已經安全ant，配置java環境OK

仔細看日誌，發現錯誤信息： 
/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用戶下，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

  選項：Host Key Verification Strategy （主機密鑰驗證策略）修改；ssh 連接默認22；如果修改port點擊高級

參考鏈接

"Known Hosts file verification strategy" 更改爲 "Manually trusted key verification strategy".

CONFIGURE AGENT -> LAUNCH METHOD -> Manually trusted key verification strategy - > SAVE.

step 2

遠程工作目錄 ，配置爲 /root/.jenkins，此處配置爲了讓master能找到slave的.ssh目錄。

至此，問題解決。

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第二個問題：出現現象

jenkins slave啓動報錯：hudson.util.IOException2: Slave JVM has terminated. Exit code=126

正常的配置如下

 

分析下圖原因：
因爲java-path(JDK路徑) ，這個報錯就是由於路徑設置(沒精確到java指令)錯誤的填寫。此處java路徑 不能僅僅指定JAVA_HOME
還要精確到java指令位置。如果只是到JAVA_HOME就會出現 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.如圖示我從節點的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/   

附上報錯日誌:

添加mac slave節點報錯如下：
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路徑指定好之後；問題完美解決如圖

ps:參考文章https://stackoverflow.com/questions/26808494/jenkins-ssh-slave-configuration