My current task involves comparing running services before and after a reboot on Linux servers. However, I am facing difficulty in getting the output to display the differences.
The function I have right now saves the pre/post state to disk. Ideally, I would like the output to be directly saved as a variable.
- name: populate service facts
service_facts:
register: facts
- name: Outputting running services
debug: var=item
with_items: "{{ facts|json_query(query)}}"
vars:
query: 'ansible_facts.services.* | [?state == `running`].name'
The desired function should look something like this:
- name: Missing running services
debug:
msg: {{ item }}
with_items:
- {{ facts_pre }}
- {{ facts_post }}
vars:
query: 'ansible_facts.services.* | [?state == `running`].name'
when: facts_pre.ansible_facts.services != facts_post.ansible_facts.services
The expected result is similar to the following example of the server state before a reboot:
ok: [hostname] => (item=NetworkManager.service) => {
"item": "NetworkManager.service"
}
ok: [hostname] => (item=systemd-udevd.service) => {
"item": "systemd-udevd.service"
}
ok: [hostname] => (item=sshd.service) => {
"item": "sshd.service"
}
ok: [hostname] => (item=systemd-journald.service) => {
"item": "systemd-journald.service"
}
If journald fails during boot for any reason, it would look like this post-reboot:
ok: [hostname] => (item=NetworkManager.service) => {
"item": "NetworkManager.service"
}
ok: [hostname] => (item=systemd-udevd.service) => {
"item": "systemd-udevd.service"
}
ok: [hostname] => (item=sshd.service) => {
"item": "sshd.service"
}
In this case, systemd-journald.service would be registered to its own variable.