6. ansible strategy

使用命令查看当前支持的strategy 列表及其描述

ansible-doc -t strategy -l

debug Executes tasks in interactive debug session
free Executes tasks without waiting for all hosts
host_pinned Executes tasks on each host without interruption
linear Executes tasks in a linear fashion    is default

liner 每个task 顺序执行，例如fork=5 我们有10个主机需要执行当前playbook 那么只能10个主机都执行了task1 之后才会往下走新的任务

free  区别于上者，task执行不需要等待所有主机执行完毕以后，再往下进行执行

host_pinned   和free模式比较类似 但是输出结果比较直观

例子

- hosts: all
  tasks:
  - name: sleep 1
    shell: sleep 1
  - name: success 
    shell: echo success

linear 模式下


PLAY [all] ****************************************************************************************************************************************************************
Friday 26 June 2020  12:54:18 +0800 (0:00:00.083)       0:00:00.083 *********** 

TASK [Gathering Facts] ****************************************************************************************************************************************************
ok: [192.168.122.10]
ok: [192.168.122.11]
ok: [192.168.122.12]
ok: [192.168.122.13]
Friday 26 June 2020  12:54:20 +0800 (0:00:01.946)       0:00:02.030 *********** 

TASK [sleep 1] ************************************************************************************************************************************************************
changed: [192.168.122.10]
changed: [192.168.122.11]
changed: [192.168.122.12]
changed: [192.168.122.13]
Friday 26 June 2020  12:54:24 +0800 (0:00:04.508)       0:00:06.539 *********** 

TASK [success] ************************************************************************************************************************************************************
changed: [192.168.122.10]
changed: [192.168.122.11]
changed: [192.168.122.12]
changed: [192.168.122.13]

PLAY RECAP ****************************************************************************************************************************************************************
192.168.122.10             : ok=3    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
192.168.122.11             : ok=3    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
192.168.122.12             : ok=3    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
192.168.122.13             : ok=3    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

Friday 26 June 2020  12:54:25 +0800 (0:00:00.424)       0:00:06.964 *********** 
=============================================================================== 
sleep 1 ------------------------------------------------------------------------------------------------------------------------------------------------------------ 4.51s
Gathering Facts ---------------------------------------------------------------------------------------------------------------------------------------------------- 1.95s
success ------------------------------------------------------------------------------------------------------------------------------------------------------------ 0.42s


free 模式下

PLAY [all] ****************************************************************************************************************************************************************
Friday 26 June 2020  12:54:44 +0800 (0:00:00.128)       0:00:00.128 *********** 
Friday 26 June 2020  12:54:44 +0800 (0:00:00.011)       0:00:00.139 *********** 
Friday 26 June 2020  12:54:46 +0800 (0:00:01.185)       0:00:01.325 *********** 
Friday 26 June 2020  12:54:47 +0800 (0:00:01.110)       0:00:02.435 *********** 

TASK [sleep 1] ************************************************************************************************************************************************************
changed: [192.168.122.10]
changed: [192.168.122.11]
changed: [192.168.122.12]
Friday 26 June 2020  12:54:48 +0800 (0:00:01.104)       0:00:03.540 *********** 
Friday 26 June 2020  12:54:49 +0800 (0:00:01.103)       0:00:04.644 *********** 
Friday 26 June 2020  12:54:49 +0800 (0:00:00.118)       0:00:04.762 *********** 
changed: [192.168.122.13]

TASK [success] ************************************************************************************************************************************************************
changed: [192.168.122.10]
changed: [192.168.122.11]
Friday 26 June 2020  12:54:49 +0800 (0:00:00.117)       0:00:04.879 *********** 
changed: [192.168.122.12]
changed: [192.168.122.13]

PLAY RECAP ****************************************************************************************************************************************************************
192.168.122.10             : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
192.168.122.11             : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
192.168.122.12             : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
192.168.122.13             : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

Friday 26 June 2020  12:54:49 +0800 (0:00:00.191)       0:00:05.071 *********** 
=============================================================================== 
sleep 1 ------------------------------------------------------------------------------------------------------------------------------------------------------------ 1.10s
success ------------------------------------------------------------------------------------------------------------------------------------------------------------ 0.19s


host_pinned 模式下

PLAY [all] ****************************************************************************************************************************************************************
Friday 26 June 2020  12:55:13 +0800 (0:00:00.128)       0:00:00.128 *********** 

TASK [sleep 1] ************************************************************************************************************************************************************
changed: [192.168.122.10]
Friday 26 June 2020  12:55:14 +0800 (0:00:01.227)       0:00:01.356 *********** 

TASK [success] ************************************************************************************************************************************************************
changed: [192.168.122.10]
Friday 26 June 2020  12:55:15 +0800 (0:00:00.131)       0:00:01.487 *********** 

TASK [sleep 1] ************************************************************************************************************************************************************
changed: [192.168.122.11]
Friday 26 June 2020  12:55:16 +0800 (0:00:01.123)       0:00:02.610 *********** 

TASK [success] ************************************************************************************************************************************************************
changed: [192.168.122.11]
Friday 26 June 2020  12:55:16 +0800 (0:00:00.124)       0:00:02.735 *********** 

TASK [sleep 1] ************************************************************************************************************************************************************
changed: [192.168.122.12]
Friday 26 June 2020  12:55:17 +0800 (0:00:01.118)       0:00:03.853 *********** 

TASK [success] ************************************************************************************************************************************************************
changed: [192.168.122.12]
Friday 26 June 2020  12:55:17 +0800 (0:00:00.124)       0:00:03.978 *********** 

TASK [sleep 1] ************************************************************************************************************************************************************
changed: [192.168.122.13]
Friday 26 June 2020  12:55:18 +0800 (0:00:01.129)       0:00:05.108 *********** 

TASK [success] ************************************************************************************************************************************************************
changed: [192.168.122.13]

PLAY RECAP ****************************************************************************************************************************************************************
192.168.122.10             : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
192.168.122.11             : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
192.168.122.12             : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
192.168.122.13             : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

Friday 26 June 2020  12:55:18 +0800 (0:00:00.126)       0:00:05.234 *********** 
=============================================================================== 
sleep 1 ------------------------------------------------------------------------------------------------------------------------------------------------------------ 1.13s
success ------------------------------------------------------------------------------------------------------------------------------------------------------------ 0.13s