Ansible 之 lineinfile

luoson1

　　本文翻译之官方文档 http://docs.ansible.com/lineinfile_module.html

lineinfile - 确保特定的行在一个文件中，或使用一个 back-referenced 正则表达式替换已经存在的行

大纲
　　这个模块将搜索文件中的行，并确保它是存在的还是不存在的。当你仅想改变文件中的一行，它是非常有用的。对于其他情况，请看 copy 或
template 模块。

选项

参数
必需
默认值
选择
注释

backrefs
no
no
yes，no
Used with state=present. If set, line can contain backreferences (both positional and named) that will get populated if the regexp matches. This flag changes the operation of the module slightly; insertbefore and insertafter will be ignored, and if the
regexp doesn't match anywhere in the file, the file will be left unchanged. If the regexp does match, the last matching line will be replaced by the expanded line parameter. (added in Ansible 1.1)
backup
no
no
yes，no
Create a backup file including the timestamp information so you can get the original file back if you somehow clobbered it incorrectly.
create
no
no
yes，no
Used with state=present. If specified, the file will be created if it does not already exist. By default it will fail if the file is missing.
dest
yes
The file to modify.
insertafter
no
EOF
EOF，*regex*
Used with state=present. If specified, the line will be inserted after the specified regular expression. A special value is available; EOF for inserting the line at the end of the file. May not be used with backrefs.
insertbefore
no
EOF，*regex*
Used with state=present. If specified, the line will be inserted before the specified regular expression. A value is available; BOF for inserting the line at the beginning of the file. May not be used with backrefs. (added in Ansible 1.1)
line
no
Required for state=present. The line to insert/replace into the file. If backrefs is set, may contain backreferences that will get expanded with the regexp capture groups if the regexp matches. The backreferences should be double escaped (see examples).
others
no
All arguments accepted by the file module also work here.
regexp
no
The regular expression to look for in every line of the file. For state=present, the pattern to replace if found; only the last line found will be replaced. For state=absent, the pattern of the line to remove. Uses Python regular expressions; see http://docs.python.org/2/library/re.html.
(added in Ansible 1.7)
state
no
present
present，absent
Whether the line should be there or not.
validate
no
None
validation to run before copying into place. Use %s in the command to indicate the current file to validate. The command is passed securely so shell features like expansion and pipes won't work. (added in Ansible 1.4)
示例

- lineinfile: dest=/etc/selinux/config regexp=^SELINUX= line=SELINUX=disabled
- lineinfile: dest=/etc/sudoers state=absent regexp="^%wheel"
- lineinfile: dest=/etc/hosts regexp='^127\.0\.0\.1' line='127.0.0.1 localhost' owner=root group=root mode=0644
- lineinfile: dest=/etc/httpd/conf/httpd.conf regexp="^Listen " insertafter="^#Listen " line="Listen 8080"
- lineinfile: dest=/etc/services regexp="^# port for http" insertbefore="^www.*80/tcp" line="# port for http by default"
# Add a line to a file if it does not exist, without passing regexp
- lineinfile: dest=/tmp/testfile line="192.168.1.99 foo.lab.net foo"
# Fully quoted because of the ': ' on the line. See the Gotchas in the YAML docs.
- lineinfile: "dest=/etc/sudoers state=present regexp='^%wheel' line='%wheel ALL=(ALL) NOPASSWD: ALL'"
- lineinfile: dest=/opt/jboss-as/bin/standalone.conf regexp='^(.*)Xms(\d+)m(.*)$' line='\1Xms${xms}m\3' backrefs=yes
# Validate a the sudoers file before saving
- lineinfile: dest=/etc/sudoers state=present regexp='^%ADMIN ALL\=' line='%ADMIN ALL=(ALL) NOPASSWD:ALL' validate='visudo -cf %s'

　　相关的资料
　　First Five (and a Half) Minutes on a Server with Ansible