我如何在Ansible中制作半透明的外壳

问题描述

我正在使用Ansible，尝试使幂等性成为shell执行时遇到了一些问题.我首先要做的是安装 python-apt软件包 ，因为我需要它使用apt模块来安装其他软件包.但是每次我运行 playbook 时，shell任务总是运行，并且我想使其成为幂等.这是我的Shell任务:

I am using Ansible and I have a little problem trying to make idempotent a shell execution. The first I do is install python-apt package because I need it to use the apt module for install others packages. But every time that I run my playbook the shell task always runs and I want to make it idempotent. Here is my shell task:

- name: install pyton-apt
  shell: apt-get install -y python-apt

这是输出，始终运行上述任务:

And here is the output, always running the above task:

$ ansible-playbook -i hosts site.yml 

PLAY [docker] ***************************************************************** 

GATHERING FACTS *************************************************************** 
ok: [10.0.3.240]

TASK: [docker | install pyton-apt] ******************************************** 
changed: [10.0.3.240]

TASK: [docker | install unzip] ************************************************ 
ok: [10.0.3.240]

PLAY RECAP ******************************************************************** 
10.0.3.240                 : ok=3    changed=1    unreachable=0    failed=0 

推荐答案

您应该使用Ansible apt模块来安装python-apt，该模块将是幂等的: http://docs.ansible.com/apt_module.html

You should use the ansible apt module to install python-apt, which will be idempotent out of the box: http://docs.ansible.com/apt_module.html

例如

- name: install python-apt
  apt: name=python-apt state=present

(注意，使用apt模块应该在远程主机上自动安装python-apt，因此我不确定为什么需要手动安装它，请参见 https://github.com/ansible/ansible/issues/4079 )

(Note using the apt module should automatically install python-apt on the remote host so I'm not sure why you would need to manually install it, see https://github.com/ansible/ansible/issues/4079)

如果由于某种原因您不能使用内置的apt模块安装python apt，则shell模块提供creates参数以帮助使其幂等.

If for some reason you can't use the inbuilt apt module to install python apt, the shell module provides the creates parameter to help make it idempotent.

- name: install python-apt
  shell: apt-get install -y python-apt >> /home/x/output.log creates=/home/x/output.log

这意味着如果/home/x/output.log已经存在，则shell模块将不会运行.

What this means is that the shell module will not run if /home/x/output.log already exists.

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