Ansibleでファイルの行を書き換える3つの方法 ref: http://qiita.com/cognitom/items/57de72b739642041dcd5

file0.yml

- name: "設定の修正(1)"
  lineinfile: >-
    dest='/path/to/file/'
    state=present
    backrefs=yes
    regexp='^#?\s*ServerTokens'
    line='ServerTokens Prod'

file1.yml

- name: "設定の修正(2)"
  lineinfile: >-
    dest='/path/to/file'
    state=present
    backrefs=yes
    regexp='{{ item.regexp }}'
    line='{{ item.line }}'
  with_items:
  - regexp: '^#?\s*ServerTokens'
    line: 'ServerTokens Prod'
  - regexp: '^#?\s*ServerSignature'
    line: 'ServerSignature Off'

file2.yml

- name: "設定の修正(3)"
  replace: >-
    dest='/path/to/file'
    regexp='AllowOverride None'
    replace='AllowOverride All'

file3.txt

...
<Directory />
    Options FollowSymLinks
    AllowOverride None
</Directory>

<Directory "/var/www/html">
    Options FollowSymLinks
    AllowOverride None
</Directory>
...

file4.yml

- name: "設定の修正(4)"
  shell: >-
    c='/path/to/file' &&
    k='<Directory "\/var\/www\/html">' &&
    s='AllowOverride None' &&
    r='AllowOverride All' &&
    mv $c $c.backup &&
    awk "/$k/{f=1} f==1&&/$s/{sub(/.+/,\"$r\"); f=0} 1" $c.backup > $c

file5.txt

awk "
  /$k/{f=1}
  f==1&&/$s/{sub(/.+/,\"$r\"); f=0}
  1
"

file6.txt

$ awk '/search/gsub(/search/replace)' target.txt > target.txt
$ sed -i -e 's/search/replace/g' target.txt
$ perl -p -i -e 's/search/replace/g' target.txt

file6.yml

---
- hosts: "webservers"
  sudo: yes
  vars:
    document_root: "/var/www/html"
    httpd_conf: "/etc/httpd/conf/httpd.conf"
  tasks:
    - name: "yumのアップデート"
      command: "yum -y update"

    - name: "パッケージのインストール"
      yum: >-
        name={{ item }}
        state=present
      with_items:
        - "httpd"
        - "libmcrypt"
        - "libselinux-python"

    - name: "httpd.confの修正 (1)"
      lineinfile: >-
        dest='{{ httpd_conf }}'
        state=present
        backrefs=yes
        regexp='{{ item.regexp }}'
        line='{{ item.line }}'
      with_items:
        - regexp: '^#?\s*ServerTokens'
          line: 'ServerTokens Prod'
        - regexp: '^#?\s*ServerSignature'
          line: 'ServerSignature Off'

    - name: "httpd.confの修正 (2)"
      shell: >-
        c='{{ httpd_conf }}' &&
        k='<Directory "{{ document_root|replace("/","\/") }}">' &&
        t='AllowOverride None' &&
        s='/None$/' &&
        r='All' &&
        awk "/$k/{f=1} f==1&&/$t/{sub($s,\"$r\"); f=0} 1" $c > $c

    - name: "サービスを起動: httpd"
      service: >-
        name= httpd
        state=started
        enabled=yes

file7.txt

$ perl -p0777 -i -e 's/search/replace/gs' target.txt

file8.yml

---
- hosts: "webservers"
  sudo: yes
  vars:
    document_root: "/var/www/html"
    httpd_conf: "/etc/httpd/conf/httpd.conf"
  tasks:
    - name: "yumのアップデート"
      command: "yum -y update"

    - name: "パッケージのインストール"
      yum: >-
        name={{ item }}
        state=present
      with_items:
        - "httpd"
        - "libmcrypt"
        - "libselinux-python"

    - name: "httpd.confの修正 (1)"
      lineinfile: >-
        dest='{{ httpd_conf }}'
        state=present
        backrefs=yes
        regexp='{{ item.regexp }}'
        line='{{ item.line }}'
      with_items:
        - regexp: '^#?\s*ServerTokens'
          line: 'ServerTokens Prod'
        - regexp: '^#?\s*ServerSignature'
          line: 'ServerSignature Off'

    - name: "httpd.confの修正 (2)"
      shell: >-
        c='{{ httpd_conf }}' &&
        k='<Directory "{{ document_root|replace("/","\/") }}">' &&
        t='AllowOverride None' &&
        s='/None$/' &&
        r='All' &&
        awk "/$k/{f=1} f==1&&/$t/{sub($s,\"$r\"); f=0} 1" $c > $c

    - name: "サービスを起動: httpd"
      service: >-
        name= httpd
        state=started
        enabled=yes