Resolved: Ansible split string into n number of variable

Question:

I have to update a config file with server IPs from a cluster. The cluster contains minimum 2 servers, however, the maximum number of servers in the cluster is unknown. I want to collect the IPs as a delimited list IP1|IP2|IPn and split them into separate variables. The below snippet is working fine with two variables.

  - name: Configure ACL
    lineinfile:
      path: /server.xml
      insertafter: '<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="localhost_access_log" suffix=".txt" pattern="%h %l %u %t "%r" %s %b"/>\n'
      line: '<Valve className=\"org.apache.catalina.valves.RemoteAddrValve\" allow=\"{{ip1}}|{{ip2}}\"\ />'

Questions:

How can I split a collected string into separate variables?
How can I generalize the above insert to n number of IPs?

Answer:

With a list of comma delimited IP addresses (YAML) such as:

ips: 1.1.1.1,2.2.2.2,3.3.3.3

You can use the Python split method in your Jinja2 templating to obtain a list:

{{ ips.split(',') }}

And template it out with the join Jinja2 filter:

  - name: Configure ACL
    vars:
      ip_list: "{{ ips.split(',') }}"
    lineinfile:
      path: /server.xml
      insertafter: '<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="localhost_access_log" suffix=".txt" pattern="%h %l %u %t "%r" %s %b"/>\n'
      line: '<Valve className=\"org.apache.catalina.valves.RemoteAddrValve\" allow=\"{{ ip_list|join('|') }}\"\ />'

The join filter takes 1 argument, which is the character to delimit each item in the list in the output of the template.
Line output:

<Valve className=\"org.apache.catalina.valves.RemoteAddrValve\" allow=\"1.1.1.1|2.2.2.2|3.3.3.3\"\ />

If you have better answer, please add a comment about this, thank you!

Resolved: Ansible split string into n number of variable

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