Hi Sandip,
What I want is to print/create a clean, well formatted list
server_name:kernel_version of servers that are not at a certain kernel
version (that's why "when" is excluding "4.18.0-305.10.2.el8_4.x86_64").
The input is whichever server name, list of servers, inventory group that I
pass on as a parameter to the playbook by using the "my_host" variable (it
was a poorly chosen variable name, I admit... :-) ).
This is how the playbook is called: playbook.yml -e
"my_host=<server|server_list|inventory_group>".
After looking again, "server" is actually unnecessary. I should just go
with: serverlist: "{{ serverlist | default({}) | combine(
{ansible_hostname: ansible_kernel} ) }}".
I know I can create that same list using something else like shell script,
which I'm much more proficient at. The idea of using ansible came as a way
of learning the basics of working with lists using a very basic example.
"lineinfile" will keep appending to that file indefinitely, I know. But my
real intention was learning how to write those lines the way I want.
That all being said, thank you very much for taking the time to
help/advise/question... (Questioning leads to better/more thinking.)
I realized that it will be much better if I read and practice more on my
own and leave to consume people's time when I'm in trouble with a real-life
playbook.
All the best,
Alex
On Mon, Sep 27, 2021 at 5:07 PM Sandip Bhattacharya <
sand...@showmethesource.org> wrote:
> Hi,
> It would be helpful to us if you could explain a bit more clearly about:
>
> a. What you want to do here
> b. What are all the inputs here
>
> Questions:
>
> - What are the variables 'my_host' and 'server' here?
> - Do you want a file created on every host? Or only on the control-host?
>
> In any case, using an ansible playbook for the kind of reporting you are
> trying
> to do, seems a bit of an overkill.
>
> If you do want to use ansible as a remote execution tool, it is easier to
> just use the 'ansible' command to print what you want, and post-process
> the output.
>
> ansible all_hosts -m setup -a "filter=ansible_kernel"
>
> If you really want a file created in one place in a playbook, use
> "connection: local" in your lineinfile so that the file is created on your
> local machine, and make sure "throttle: 1" is also set, so that it is
> not clobbered by other threads.
>
> Something like this would work:
> https://gist.github.com/sandipb/8ad80e6af9d471b04e2ec7948224ff3d
>
> Also, when using lineinfile, it is really important that you make it as
> much
> idempotent as possible. Else, if you run your playbook on different days,
> it
> would be filled with all the possible values of every host all this
> while. The
> regex parameter is really important here, making sure that every host has
> exactly one line, or none if it is not desired.
>
>
> HTH,
> Sandip
>
>
>
>
>
> On 28.09.21 00:03, Alex Wanderley wrote:
> > Hello,
> >
> > I understand this very basic, but I'm still learning... (And my
> apologies for the long message.)
> >
> > I built the playbook below so I can check which server is still in need
> of an OS update based on its current kernel version:
> > ---
> > - hosts: "{{ my_host }}"
> > remote_user: xxxxxx
> >
> > vars:
> > server:
> > srvname: "{{ ansible_hostname }}"
> > kernel: "{{ ansible_kernel }}"
> >
> > tasks:
> >
> > - block:
> > - name: create list
> > set_fact:
> > serverlist: "{{ serverlist | default({}) | combine(
> {item.srvname: item.kernel} ) }}"
> > with_items:
> > - "{{ server }}"
> >
> > - name: print list
> > debug:
> > msg: "{{ serverlist }}"
> >
> > - name: send list to file
> > lineinfile:
> > create: yes
> > line: "{{ serverlist | string }}"
> > path: "/shared/kernel.list"
> > when: (ansible_distribution == "OracleLinux") and
> (hostvars[inventory_hostname].ansible_kernel !=
> "4.18.0-305.10.2.el8_4.x86_64")
> >
> > It's working, but I'd like to improve the way it presents the list of
> servers in need of update... So, could you help with some hints on how I
> could:
> >
> > Make the "print list" task work in a way that instead of printing this:
> > TASK [print list]
> **************************************************************************
> > ok: [xxxxxxxx] => {
> > "msg": {
> > "xxxxxxxxx": "4.18.0-240.10.1.el8_3.x86_64"
> > }
> > }
> > ok: [yyyyyyyy] => {
> > "msg": {
> > "yyyyyyyy": "4.18.0-240.10.1.el8_3.x86_64"
> > }
> > ===> It would print something like (or closer to) this:
> > "msg": {
> > "xxxxxxxxx": "4.18.0-240.10.1.el8_3.x86_64'
> > "yyyyyyyy": "4.18.0-240.10.1.el8_3.x86_64
> > }
> >
> > And, on the "send list to file" task, how would I have the file content
> changed from this:
> > {'xxxxxxxxx ': '4.18.0-240.10.1.el8_3.x86_64'}
> > {' yyyyyyyy ': '4.18.0-240.10.1.el8_3.x86_64'}
> > ===> To something like this:
> > xxxxxxxxx: 4.18.0-240.10.1.el8_3.x86_64
> > {yyyyyyyy: 4.18.0-240.10.1.el8_3.x86_64
> > I mean, without single quotes and curly braces.
> >
> > I understand I could build another task to parse that file an "clean"
> it, but, is there a way to do that while writing to the file?
>
>
> --
> https://blog.sandipb.net
> https://twitter.com/sandipb
>
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>
--
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Alex Wanderley
Application and Infrastructure Analyst II
Acting Team Lead Storage and Backup Solutions
Financial and Corporate Services | Open City and Technology
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