我如何在Ansibe的50％计算机上发布代码 [英] How can i release code on 50% machine in Ansibe

问题描述

我们在aws中使用标签Name = ad_server
运行了100台计算机，所以我如何只运行50％的发行代码。
示例：

we have running 100 Machines in aws with tag Name=ad_server so how can i run release code only 50% machines. Example:

 - hosts: tag_Name_ad_server
   sudo: yes
   remote_user: ubuntu

   tasks:
     - name: whatever

那我该怎么办

推荐答案

选项1：序列+暂停

此将使用批处理的标准功能进行滚动更新，并且需要一些用户交互。

我们添加暂停并带有提示作为第一个任务，等待ENTER输入

因此，在第一个50％的批次上按ENTER，然后在要求开始下一个后一半时中止执行。

Option 1: serial + pause

This will use standard feature of batches for rolling updates and require some user interaction.
We add pause with prompt as a first task to wait for ENTER to be pressed at the start of every batch.
So press ENTER on the first 50%-batch and then abort execution when asked to start the second half.

- hosts: tag_Name_ad_server
  user: ubuntu
  serial: "50%"
  tasks:
    - pause: prompt="Press ENTER to run this batch"
    - shell: echo task1
    - shell: echo task2

每次运行剧本时，序列始终会从清单中选择相同的服务器。在这种情况下，列表中的前50％。

With every playbook run serial will always choose the same servers from inventory. In this case first 50% from the list.

通过主机位于tag_Name_ad_server组中，并形成一个新的50％组。

然后在此新组中执行实际任务。

不需要用户交互。

Loop through hosts in tag_Name_ad_server group and form a new 50_percent group.
Then execute your actual tasks within this new group.
No user interaction required.

- hosts: tag_Name_ad_server
  gather_facts: no
  tasks:
    - group_by: key=50_percent
      when: 100 | random > 50

- hosts: 50_percent
  user: ubuntu
  tasks:
    - shell: echo task1
    - shell: echo task2

如果运行了Playbook，则 random 将从列表中选择50％随机服务器。

With ever playbook run random will choose 50% random servers from the list.

如果仅运行一项任务，则可以使用 max_fail_percentage：-1 在执行第一批任务后停止执行。

这将产生50％的批处理，在每个主机上执行第一个任务

If you have only one task to run, you can use max_fail_percentage: -1 to stop execution after first task of first batch.
This will make a 50%-batches, execute first task on every host of this batch and check failed servers count, as it always will be above -1 playbook will stop execution.

- hosts: tag_Name_ad_server
  user: ubuntu
  serial: "50%"
  max_fail_percentage: -1
  tasks:
    - shell: echo task1
    - shell: echo task2 # this task will never be executed with max_fail_percentage == -1

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