无法通过 jenkins 连接到 AWS 从站答案

【问题标题】：Unable to connect to AWS slave via jenkins无法通过 jenkins 连接到 AWS 从站
【发布时间】：2017-01-31 18:40:00
【问题描述】：

我正在尝试使用 jenkins 中的 EC2 插件配置主从配置。配置 EC2 插件后，jenkins 成功启动了从站，我什至可以 ssh 进入该从站。但是当我查看 jenkins 中的节点日志时，我发现 jenkins 无法连接到从站。这是我所看到的：

This node is offline because Jenkins failed to launch the slave agent   on it. See log for more details
INFO: Authenticating as ubuntu
Jan 31, 2017 6:29:00 PM null
INFO: Connecting to ip-10-226-254-52.ec2.internal on port 22, with timeout 10000.
Jan 31, 2017 6:29:10 PM null
INFO: Failed to connect via ssh: The kexTimeout (10000 ms) expired.
Jan 31, 2017 6:29:10 PM null
INFO: Waiting for SSH to come up. Sleeping 5.
Jan 31, 2017 6:29:15 PM null
INFO: Connecting to ip-10-226-254-52.ec2.internal on port 22, with timeout 10000.
Jan 31, 2017 6:29:25 PM null
INFO: Failed to connect via ssh: The kexTimeout (10000 ms) expired.
Jan 31, 2017 6:29:25 PM null
INFO: Waiting for SSH to come up. Sleeping 5.
ERROR: Unexpected error in launching a slave. This is probably a bug in Jenkins
java.lang.NullPointerException
at hudson.plugins.ec2.ssh.EC2UnixLauncher.bootstrap(EC2UnixLauncher.java:309)
at hudson.plugins.ec2.ssh.EC2UnixLauncher.launch(EC2UnixLauncher.java:131)
at hudson.plugins.ec2.EC2ComputerLauncher.launch(EC2ComputerLauncher.java:122)
at hudson.slaves.SlaveComputer$1.call(SlaveComputer.java:253)
at jenkins.util.ContextResettingExecutorService$2.call(ContextResettingExecutorService.java:46)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)

我在网上查过了，但帮不上什么忙。如果你们中的任何人熟悉这种错误，请帮助我。提前致谢。

【问题讨论】：

您是否指定了 jenkins 用户/进程用于连接的 SSH 密钥？
@MichaelJ - 是的，我指定了用于从命令行进行 ssh 的密钥。这是示例控制台詹金斯输出INFO: Launching instance: i-04f2269ce08edf96d Feb 01, 2017 3:13:41 AM null INFO: bootstrap() Feb 01, 2017 3:13:41 AM null INFO: Getting keypair... Feb 01, 2017 3:13:41 AM null INFO: Using key: fst-load-demo
我还看到 jenkins 不断尝试连接从属实例 INFO: Waiting for SSH to come up. Sleeping 5. Feb 01, 2017 4:59:58 AM null INFO: Connecting to 10.226.254.15 on port 22, with timeout 10000. Feb 01, 2017 5:00:08 AM null INFO: Failed to connect via ssh: The kexTimeout (10000 ms) expired. Feb 01, 2017 5:00:08 AM null INFO: Waiting for SSH to come up. Sleeping 5. Feb 01, 2017 5:00:13 AM null INFO: Connecting to 10.226.254.15 on port 22, with timeout 10000

标签： jenkins ssh amazon-ec2 continuous-integration jenkins-plugins

【解决方案1】：

我想我已经想通了。我为从服务器指定的安全组没有 SSH 端口 (22) 未在主服务器的安全组上打开。打开 SSH 端口后，我可以连接到从节点注意：我为 master 和 slave 使用相同的安全组

INFO: Connected via SSH.
Feb 02, 2017 4:29:59 PM null
INFO: connect fresh as root

【讨论】：