[ansible学习笔记]fetch模块

心心失意

　　摘自官方文档：

• 　　This module works like copy, but in reverse. It is used for fetching files from remote machines and storing them locally in a file tree, organized by hostname. Note that this module is written to transfer log files that might not be present, so a missing remote file won’t be an error unless fail_on_missing is set to ‘yes’.
  

　　选项：
parameterrequireddefaultchoicescommentsdestyes　　A directory to save the file into. For example, if the dest directory is /backup a src file named /etc/profile on host host.example.com, would be saved into /backup/host.example.com/etc/profile
fail_on_missingnono

• 　　yes
  
• 　　no
  

　　When set to 'yes', the task will fail if the source file is missing.
flatno　　Allows you to override the default behavior of appending hostname/path/to/file to the destination. If dest ends with '/', it will use the basename of the source file, similar to the copy module. Obviously this is only handy if the filenames are unique.
srcyes
　　The file on the remote system to fetch. This must be a file, not a directory. Recursive fetching may be supported in a later>validate_checksum　　(added in 1.4)
noyes

• 　　yes
  
• 　　no
  

　　Verify that the source and destination checksums match after the files are fetched.
　　aliases: validate_md5
　　样例：
　　[root@reedoracle reed]# cat roles/common/tasks/main.yml
　　---
　　- name: fetch
　　fetch:
　　src: /etc/hosts
　　dest: /tmp/fetchdir
　　[root@reedoracle reed]# cat site.yml
　　---
　　- hosts: app
　　tasks:
　　- name: mkdir -p /tmp/fetchdir
　　command: mkdir -p /tmp/fetchdir
　　roles:
　　- common
　　[root@reedoracle reed]# ansible-playbook site.yml
　　SSH password:
　　PLAY [app] *********************************************************************
　　TASK [setup] *******************************************************************
　　ok: [rhel56-192.168.209.133]
　　ok: [rhel61-192.168.209.142]
　　TASK [common : fetch] **********************************************************
　　changed: [rhel56-192.168.209.133]
　　changed: [rhel61-192.168.209.142]
　　TASK [mkdir -p /tmp/fetchdir] **************************************************
　　changed: [rhel56-192.168.209.133]
　　[WARNING]: Consider using file module with state=directory rather than running mkdir
　　changed: [rhel61-192.168.209.142]
　　PLAY RECAP *********************************************************************
　　rhel56-192.168.209.133     : ok=3    changed=2    unreachable=0    failed=0
　　rhel61-192.168.209.142     : ok=3    changed=2    unreachable=0    failed=0
　　[root@reedoracle reed]# ll /tmp/fetchdir/{rhel56-192.168.209.133,rhel61-192.168.209.142}/etc/
　　/tmp/fetchdir/rhel56-192.168.209.133/etc/:
　　total 4
　　-rw-r--r-- 1 root root 187 Feb 16 18:31 hosts
　　/tmp/fetchdir/rhel61-192.168.209.142/etc/:
　　total 4
　　-rw-r--r-- 1 root root 158 Feb 16 18:31 hosts