Replace a line in a config file with ansible

Question

I am new to ansible.

Is there a simple way to replace the line starting with option domain-name-servers in /etc/dhcp/interface-br0.conf with mo

Answer 1

we can use lineinfile module to replace a line

using ad-hoc command:

ansible  -m lineinfile -a "path=/etc/dhcp/interface-br0.conf regexp=''^(.*)option domain-name-servers(.*)$'' line='1option domain-name-servers 10.116.184.1,10.116.144.1,10.116.136.1;' backrefs: yes"

using ansible playbook:

- name: replacing a line in file
  lineinfile: 
    path: /etc/dhcp/interface-br0.conf 
    regexp: '^(.*)option domain-name-servers(.*)$' 
    line: 'option domain-name-servers 10.116.184.1,10.116.144.1,10.116.136.1;'
    backrefs: yes

for more we can check for other options: in lineinfile module

https://docs.ansible.com/ansible/latest/modules/lineinfile_module.html