Extract two strings from a line of text with Ansible

Question

I have this list from a shell output.

- 192.168.20.76:3260,1054 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6
- 192.168.21.126:3260,1056 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6
- 192.168.21.125:3260,1055 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6
- 192.168.20.75:3260,1053 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6
- 192.168.22.20:3260,1052 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6
- 192.168.22.19:3260,1051 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6

I want to get both the IP and the iqn.xxxxx from the list when the IP is in the same vlan as the host.

I am able to create a list of the correct IP's but can't figure out how to also get the corresponding iqn.

Code:

  - hosts: test_server
    gather_facts: yes 
    tasks: 
      - name:
        set_facts:
          iscsi_vlan: '192.168.20.64/28'
      - name: iscsiadm discovery
        command: /usr/sbin/iscsiadm iscsiadm --mode discovery --type sendtargets --portal {{ storage_fqdn }}
        register: iscsiadm_out
      - name: facts
        set_fact:
          target_list: "{{ target_list + item | regex_findall('(^\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})') | ipaddr( iscsi_vlan ) }}"
        loop: "{{ iscsiadm_out.stdout_lines }}"
      - name: target_list
        debug: 
          var: target_list

target_list contains this. It matches the correct subnet using the ip_addr function.

ok: [test-server] => 
  target_list:
  - 192.168.20.76
  - 192.168.20.75

Basically I end up with trying to search in a list with the contents of another list.

• I've tried with_subelements but it requires a string and a list
• I've tried to figure out how I can extract both the correct IP and the iqn from iscsiadm_out in one go with regex, but can't.
• I've contemplated turning iscsiadm_out into a json object and then use json_query, but I don't know how to do that.

How can I either use this list to extract the iqn from iscsiadm_out or maybe in a totally different way?

I understand I can use commands like grep and awk in the command module, but I don't like that option.

In my testing I have searched around here and elswhere on the Internet for hours. I'm a novice at Ansible and a total noob at python and jinja2, but I tried to investigate those paths too to no avail.

Answer 1

There are other ways to acheive the same result but you can build-up on the below concepts. I'm simply extracting your expected info at once in a dict list (each dict containing an ip/iqn pair) and looping over it to filter out the expected elements.

The demo playbook:

---
- name: Extract IP and IQN
  hosts: localhost
  gather_facts: false

  vars:
    # This is what you get from your command
    iscsiadm:
      stdout_lines:
        - 192.168.20.76:3260,1054 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6
        - 192.168.21.126:3260,1056 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6
        - 192.168.21.125:3260,1055 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6
        - 192.168.20.75:3260,1053 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6
        - 192.168.22.20:3260,1052 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6
        - 192.168.22.19:3260,1051 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6

    iscsi_vlan: '192.168.20.64/28'

  tasks:
    - name: "Create a list of {ip: x, iqn: y} dicts from the command result"
      vars:
        current_entry:
          - ip: >-
              {{ item | regex_replace('(^(\d{1,3}\.){3}\d{1,3}).*$', '\g<1>') }}
            iqn: >-
              {{ item | regex_replace('^.* (iqn\.\d*-\d*.com.netapp).*$', '\g<1>') }}
      set_fact:
        ipqn_list: "{{ ipqn_list | default([]) + current_entry }}"
      loop: "{{ iscsiadm.stdout_lines }}"

    - name: Debug element when ip is in our subnet (change to whatever is relevant)
      debug:
        msg: "IP {{ item.ip }} with IQN {{ item.iqn }} is in our subnet"
      loop: "{{ ipqn_list }}"
      when: item.ip | ipaddr(iscsi_vlan)

gives the result:

PLAY [Extract IP and IQN] **************************************************************************************************************************************************************************************************************

TASK [Create a list of {ip: x, iqn: y} dicts from the command result] ******************************************************************************************************************************************************************
ok: [localhost] => (item=192.168.20.76:3260,1054 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6)
ok: [localhost] => (item=192.168.21.126:3260,1056 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6)
ok: [localhost] => (item=192.168.21.125:3260,1055 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6)
ok: [localhost] => (item=192.168.20.75:3260,1053 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6)
ok: [localhost] => (item=192.168.22.20:3260,1052 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6)
ok: [localhost] => (item=192.168.22.19:3260,1051 iqn.1992-08.com.netapp:sn.f4bc76f43e2611e883e200a098d2174a:vs.6)

TASK [Debug element when ip is in our subnet (change to whatever is relevant)] *********************************************************************************************************************************************************
ok: [localhost] => (item={'ip': '192.168.20.76', 'iqn': 'iqn.1992-08.com.netapp'}) => {
    "msg": "IP 192.168.20.76 with IQN iqn.1992-08.com.netapp is in our subnet"
}
skipping: [localhost] => (item={'ip': '192.168.21.126', 'iqn': 'iqn.1992-08.com.netapp'}) 
skipping: [localhost] => (item={'ip': '192.168.21.125', 'iqn': 'iqn.1992-08.com.netapp'}) 
ok: [localhost] => (item={'ip': '192.168.20.75', 'iqn': 'iqn.1992-08.com.netapp'}) => {
    "msg": "IP 192.168.20.75 with IQN iqn.1992-08.com.netapp is in our subnet"
}
skipping: [localhost] => (item={'ip': '192.168.22.20', 'iqn': 'iqn.1992-08.com.netapp'}) 
skipping: [localhost] => (item={'ip': '192.168.22.19', 'iqn': 'iqn.1992-08.com.netapp'}) 

PLAY RECAP *****************************************************************************************************************************************************************************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0