Checking for a string and value

[Vino B]

Hi All,

  Request your help, I need to find whether the string numa_balancing is set to disabled in the file /etc/default/grub where the string in contained in the string GRUB_CMDLINE_LINUX_DEFAULT any help on this is much appreciated.

cat /etc/default/grub|grep GRUB_CMDLINE_LINUX_DEFAULT

GRUB_CMDLINE_LINUX_DEFAULT="root=/dev/hda1 disk=/dev/hda resume=swap console=ttyS0,115200n8 multipath=off net.ifnames=0 NON_PERSISTENT_DEVICE_NAMES=1 quiet elevator=noop intel_idle.max_cstate=1 processor.max_cstate=1 numa_balancing=disable"

From,

Vino.B

[Kai Stian Olstad]

There are many ways to do that, here is one

- slurp:
src: /etc/default/grub
register: r

- debug: msg="Found it"
when: r.content | b64decode | regex_search('^GRUB_CMDLINE_LINUX_DEFAULT=.*numa_balancing=disable')


--
Kai Stian Olstad

[Vino B]

Hi Kai,

   Thank you very much, but the above solution always states tune eve when the search criteria is changed eg. in the above code if you change the =disable" to ="disbaleX" it should fail, but the output states as successful

when: r.content | b64decode | regex_search('^GRUB_CMDLINE_LINUX_DEFAULT=.*numa_balancing=disableX') 

 

 From,

Vino.B

[Kai Stian Olstad]

On Sunday, 11 March 2018 07.45.48 CET Vino B wrote:
>
> On Sunday, March 11, 2018 at 3:07:24 AM UTC+8, Kai Stian Olstad wrote:
> >
> > There are many ways to do that, here is one
> >
> > - slurp:
> > src: /etc/default/grub
> > register: r
> >
> > - debug: msg="Found it"
> > when: r.content | b64decode |
> > regex_search('^GRUB_CMDLINE_LINUX_DEFAULT=.*numa_balancing=disable')
> >
> >
> >
>

> Thank you very much, but the above solution always states tune eve when
> the search criteria is changed eg. in the above code if you change the
> =disable" to ="disbaleX" it should fail, but the output states as successful
>
> when: r.content | b64decode |
> regex_search('^GRUB_CMDLINE_LINUX_DEFAULT=.*numa_balancing=disableX')

I made a little test and can't confirm this

$ cat grub

GRUB_CMDLINE_LINUX_DEFAULT="root=/dev/hda1 disk=/dev/hda resume=swap console=ttyS0,115200n8 multipath=off net.ifnames=0 NON_PERSISTENT_DEVICE_NAMES=1 quiet elevator=noop intel_idle.max_cstate=1 processor.max_cstate=1 numa_balancing=disable"

cat test.yml
---
- hosts: localhost
tasks:
- slurp:
src: grub
register: r

- name: disable

debug: msg="Found it"
when: r.content | b64decode | regex_search('^GRUB_CMDLINE_LINUX_DEFAULT=.*numa_balancing=disable')

- name: diableX
debug: msg="Found it"
when: r.content | b64decode | regex_search('^GRUB_CMDLINE_LINUX_DEFAULT=.*numa_balancing=disableX')


Output:

TASK [disable] **********************************
ok: [localhost] => {}

MSG:

Found it


TASK [diableX] **********************************
skipping: [localhost] => {
"changed": false,
"skip_reason": "Conditional result was False"
}



--
Kai Stian Olstad

[Vino B]

Hi Kai,

  Below is the playbook does not execute the debug part , can you help me what is wrong in the below play book.

---

- hosts: target

  remote_user: ansible

  become: true

  become_method: sudo

  tasks:

   - slurp:

      src: /etc/default/grub

     register: r

   - name: Check whether AutoNuma is disabled

     debug: msg="Found it"

     when: r.content|b64decode|regex_search('^GRUB_CMDLINE_LINUX_DEFAULT=.*numa_balancing=disableX')

 

OUTPUT:

PLAY [target] **********************************************************************************************************************************************************

TASK [Gathering Facts] *************************************************************************************************************************************************

ok: [10.162.54.34]

TASK [slurp] ***********************************************************************************************************************************************************

ok: [10.162.54.34]

TASK [Check whether AutoNuma is disabled] ******************************************************************************************************************************

skipping: [10.162.54.34]

PLAY RECAP *************************************************************************************************************************************************************

10.162.54.34               : ok=2    changed=0    unreachable=0    failed=0

[Kai Stian Olstad]

On 11.03.2018 13:17, Vino B wrote:
> Below is the playbook does not execute the debug part , can you help
> me
> what is wrong in the below play book.
>
> ---
> - hosts: target
> remote_user: ansible
> become: true
> become_method: sudo
> tasks:
> - slurp:
> src: /etc/default/grub
> register: r
> - name: Check whether AutoNuma is disabled
> debug: msg="Found it"
> when:
> r.content|b64decode|regex_search('^GRUB_CMDLINE_LINUX_DEFAULT=.*numa_balancing=disableX')
>
> OUTPUT:

<snip />

> TASK [Check whether AutoNuma is disabled]
> ******************************************************************************************************************************
> skipping: [10.162.54.34]

The file does not have disableX in it so it will not run the task.
If you are looking for the opposite behaviour you need to add "not"

when: not
(r.content|b64decode|regex_search('^GRUB_CMDLINE_LINUX_DEFAULT=.*numa_balancing=disableX'))


--
Kai Stian Olstad

[Vino B]