Ansible替换模块

一、ansible替换遇到的问题

ansible在使用sed进行替换时,经常会遇到需要转义的问题,而且ansible在遇到特殊符号进行替换时,存在问题,无法正常进行替换 。其实在ansible自身提供了两个模块---lineinfile模块和replace模块,可以方便的进行替换 。这里以使用ansilble安装salt-minion为例,用如下playbook语句执行时,是执行不成功的:

shell: sed -i '/^#id:/a\id: {{ ansible_ens192.ipv4.address }}' /etc/salt/minion

由于上面的语名里特殊符号比较多,多次转义测试不成功。同样直接调用shell 模块时也会遇到这样问题,比如这里有一个将/etc/hosts最后一行注释的语句,使用$s 变量时会不成功,需要通过 \进行转义 。

ansible all  -m shell -a "sed -e '$s/^/#/g' /etc/hosts"  //不成功
ansible all  -m shell -a "sed -i '\$s/#//g' /etc/hosts"    //成功

接下来我们看下ansilbe自的替换模块。

二、lineinfile模块

ansible-doc帮助信息给我们的示例如下:

- lineinfile: dest=/etc/selinux/config regexp=^SELINUX= line=SELINUX=enforcing  行替换
- lineinfile: dest=/etc/sudoers state=absent regexp="^%wheel"   行删除
- 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"  将以 #Listen 开头行的下面的 以Listen开头的行换成
- 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 the sudoers file before saving
- lineinfile: dest=/etc/sudoers state=present regexp='^%ADMIN ALL\=' line='%ADMIN ALL=(ALL) NOPASSWD:ALL' validate='visudo -cf %s'

三、replace模块

该模块有点类似于sed命令,主要也是基于正则进行匹配和替换,如下:

- replace: dest=/etc/hosts regexp='(\s+)old\.host\.name(\s+.*)?$' replace='\1new.host.name\2' backup=yes
- replace: dest=/home/jdoe/.ssh/known_hosts regexp='^old\.host\.name[^\n]*\n' owner=jdoe group=jdoe mode=644
- replace: dest=/etc/apache/ports regexp='^(NameVirtualHost|Listen)\s+80\s*$' replace='\1 127.0.0.1:8080' validate='/usr/sbin/apache2ctl -f %s -t'

四、原来的问题

回到原来的问题,使用ansible安装salt-minion涉及到的替换问题,这里用的playbook最后的修改结果如下:

- name: Fetch configuration from all testservers ,code from www.361way.com
  hosts: all
  vars:
      ID: "id:"
      masterip: "master: 10.211.95.232"
  tasks:
      - name: copy migu repo to hosts
        copy: src=./file/migu_rhel7.repo dest=/etc/yum.repos.d/migumirror.repo
      - name: install salt repo
        yum: name=https://repo.saltstack.com/yum/redhat/salt-repo-latest-2.el7.noarch.rpm state=present
      - name: install salt minion
        yum: name=salt-minion  state=latest
      - name: set the salt master ip
        shell: echo {{ masterip }} >>/etc/salt/minion
      - name: Get config
        #shell: sed -i '/^#id:/a\id: {{ ansible_ens192.ipv4.address }}' /etc/salt/minion
        lineinfile: dest=/etc/salt/minion regexp="^#id" line="{{ ID }} {{ inventory_hostname }}"
      - name: enable and start minion
        shell: "systemctl enable salt-minion.service && systemctl start salt-minion.service"




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