On the web you can find many tips about how to update CentOS/RHEL linux systems. Some of them are quite old and do not leverage new features available in recent Ansible versions, other has some issues or do not provide a nice way to display what’s going on.
Recently I’ve spent some time tuning ansible playbook to develop a nice way to update my RedHat family systems.
Below you will find tasks from the playbook (I do not post whole playbook as you can have your own requirements e.g. for serialization or host group):
- name: check packages for updates
shell: yum list updates | awk 'f;/Updated Packages/{f=1;}' | awk '{ print $1 }'
changed_when: updates.stdout_lines | length > 0
args:
warn: false
register: updates
- name: display count
debug:
msg: "Found {{ updates.stdout_lines | length }} packages to be updated:\n\n{{ updates.stdout }}"
- when: updates.stdout_lines | length > 0
block:
- name: install updates using yum
name: "*"
state: latest
- name: install yum-utils
package:
name: yum-utils
- name: check if reboot is required
shell: needs-restarting -r
failed_when: false
register: reboot_required
changed_when: false
- when: updates.stdout_lines | length > 0 and reboot_required.rc != 0
block:
- name: reboot the server if required
shell: sleep 3; reboot
ignore_errors: true
changed_when: false
async: 1
poll: 0
- name: wait for server to come back after reboot
wait_for_connection:
timeout: 600
delay: 20
register: reboot_result
- name: reboot time
debug:
msg: "The system rebooted in {{ reboot_result.elapsed }} seconds."
I hope you find it useful :)
Very useful! Thanks a lot!
I have been searching for an elegant and simple solution for this as Red Hat is failing to solve this properly.
On Debian systems it is quit easy to establish if a server needs a reboot but on Red Hat servers it is very difficult to determine if they need a reboot.
there is a reboot module you should look into – it can reboot a machine more nicely than the last stanza on this page.
https://docs.ansible.com/ansible/latest/modules/reboot_module.html
luktom,
Would you be able to automate this for me? I can pay you.
: https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.4/html/installation_guide/rhel6_to_rhel7
Regards
Thanks,
On the shell task I always add this to be sure my locale system is always in english to parse the command output.
environment:
LC_ALL: C
“args
warn: false”
for “changed_when” has been deprecated now when i use it in a playbook.
what was it set false to warn for in the first place?
never experienced this to warn about anything when i tried to remove it, and now it only works without this arg.
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