问题
使用ansible mitogen 0.3.4插件进行kubespray安装时，报错：
EOF on stream; last 100 lines received:\nssh: Could not resolve hostname {%: Name or service not known
分析
经过debug分析，kubespray-default默认定义了如下变量模板：
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ansible_ssh_common_args: | "{% if 'bastion' in groups['all'] %} -o ProxyCommand='ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -W %h:%p -p {{ hostvars['bastion']['ansible_port'] | default(22) }} {{ hostvars['bastion']['ansible_user'] }}@{{ hostvars['bastion']['ansible_host'] }} {% if ansible_ssh_private_key_file is defined %} -i {{ ansible_ssh_private_key_file }}{% endif %} ' {% endif %}" |
但是通过ansible role去执行后，通过mitogen进行ssh并没有渲染出来变量：
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mitogen.parent: command line for Connection(None): ssh -o "LogLevel ERROR" -l root -p 22 -o "Compression yes" -o "ServerAliveInterval 30" -o "ServerAliveCountMax 10" -o "StrictHostKeyChecking no" -o "UserKnownHostsFile /dev/null" -o "GlobalKnownHostsFile /dev/null" -C -o ControlMaster=auto -o ControlPersist=60s {% if bastion in groups[all] %} -o "ProxyCommand=ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -W %h:%p -p {{ hostvars[bastion][ansible_port] | default(22) }} {{ hostvars[bastion][ansible_user] }}@{{ hostvars[bastion][ansible_host] }} {% if ansible_ssh_private_key_file is defined %} -i {{ ansible_ssh_private_key_file }}{% endif %} " {% endif %} 172.20.59.209 /usr/bin/python -c |
可以看到，mitogen的ssh将ansible_ssh_common_args原封不动地输出来了
修改源码验证：
修改transport_config.py， 增加debug信息：
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476 def ssh_args(self): 478 print('------------>') 479 print('ssh_args: ',C.config.get_config_value("ssh_args", plugin_type="connection", plugin_name="ssh", variables=self._task_vars.get("vars", {}))) 480 print('ssh_common_args: ',C.config.get_config_value("ssh_common_args", plugin_type="connection", plugin_name="ssh", variables=self._task_vars.get("vars", {}))) 481 print('ssh_extra_args: ', C.config.get_config_value("ssh_extra_args", plugin_type="connection", plugin_name="ssh", variables=self._task_vars.get("vars", {}))) 482 print('----------->') 483 return [ 484 mitogen.core.to_text(term) 485 for s in ( 486 C.config.get_config_value("ssh_args", plugin_type="connection", plugin_name="ssh", variables=self._task_vars.get("vars", {})), 487 C.config.get_config_value("ssh_common_args", plugin_type="connection", plugin_name="ssh", variables=self._task_vars.get("vars", {})), 488 C.config.get_config_value("ssh_extra_args", plugin_type="connection", plugin_name="ssh", variables=self._task_vars.get("vars", {})) 489 #C.config.get_config_value("ssh_args", plugin_type="connection", plugin_name="ssh", variables=local_vars), 490 #C.config.get_config_value("ssh_common_args", plugin_type="connection", plugin_name="ssh", variables=local_vars), 491 #C.config.get_config_value("ssh_extra_args", plugin_type="connection", plugin_name="ssh", variables=local_vars) 492 ) 493 for term in ansible.utils.shlex.shlex_split(s or '') 494 ] |
下面是输出：
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------------> ssh_args: -o ControlMaster=auto -o ControlPersist=1d -o UserKnownHostsFile=/dev/null -o ConnectTimeout=30 -o Compression=yes -o TCPKeepAlive=yes -o ServerAliveInterval=60 -o StrictHostKeyChecking=no -o AddKeysToAgent=yes -o ControlPath=~/.ssh/%r@%h-%p ssh_common_args: {% if 'bastion' in groups['all'] %} -o ProxyCommand='ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -W %h:%p -p {{ hostvars['bastion']['ansible_port'] | default(22) }} {{ hostvars['bastion']['ansible_user'] }}@{{ hostvars['bastion']['ansible_host'] }} {% if ansible_ssh_private_key_file is defined %}-i {{ ansible_ssh_private_key_file }}{% endif %} ' {% endif %} ssh_extra_args: -----------> |
可以看到ssh_common_args变量没有渲染
解决
将_task_vars.get(“vars”, {}) 改为 _task_vars.get(“hostvars”, {})， 从hostvars取值
搜索官方issures: https://github.com/mitogen-hq/mitogen/pull/956
commit ac34252bcccb60b50e6a8ed3a3b2f42d256d62e0
总结
原代码是通过_task_vars.get(“vars”, {})来获取ssh参数，导致模板不能正确地解析，现修改为通过_task_vars.get(“hostvars”, {})进行获取
不知为何作者没有将此修复合并进去，导致目前最新的master分支也会出现这个问题。
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