How to set a variable in vars/main.yml conditionally?

[ZillaYT]

I'm writing a role to configure syslog, and of course the service is different between Linux instances. How do I do this in var/main.yml?

# pseudo-code in vars/main.yml
if Redhat7.x
  syslog_service: rsyslog
else if RedHat6.x
  syslog_service: syslog
end

So then I can just do this in tasks/main.yml

- name: Ensure syslog is running
  service: name="{{ syslog_service }}" state=running enabled=yes

Thanks!

[Kai Stian Olstad]

On 01. sep. 2016 18:02, ZillaYT wrote:
> I'm writing a role to configure syslog, and of course the service is
> different between Linux instances. How do I do this in var/main.yml?

The directory must be vars not var.

> # pseudo-code in vars/main.yml
> if Redhat7.x
> syslog_service: rsyslog
> else if RedHat6.x
> syslog_service: syslog
> end

It's not possible, vars/main.yml can only contain variable definitions,
not logic.

> So then I can just do this in tasks/main.yml
>
> - name: Ensure syslog is running
> service: name="{{ syslog_service }}" state=running enabled=yes

You must split it in two tasks.
ansible_os_family and ansible_lsb.major_release values is probably wrong
so you need to find the correct ones.

- name: Ensure syslog is running on Redhat 6.x
service: name=syslog state=running enabled=yes
when: ansible_os_family == "RedHat" and ansible_lsb.major_release == "6"

- name: Ensure syslog is running on Redhat 7.x
service: name=rsyslog state=running enabled=yes
when: ansible_os_family == "RedHat" and ansible_lsb.major_release == "7"

--
Kai Stian Olstad

[ZillaYT]

Having a lot of -name/when task blocks is just ugly infrastructure. I have to think of a better way. There's GOT to be a better way.

[Allen Sanabria]

include_vars is your friend.

For instance in tasks/main.yml you can say..

- include_vars: RedHat6.yml

 when: ansible_os_family == "RedHat" and ansible_lsb.major_release == "6"

- include_vars: RedHat7.yml

 when: ansible_os_family == "RedHat" and ansible_lsb.major_release == "7"

[Allen Sanabria]

include_vars is your friend.

For instance in tasks you can say..

```yaml

- include_vars: RedHat6.yml

  when: ansible_os_family == "RedHat" and ansible_lsb.major_release == "6"

- include_vars: RedHat7.yml

  when: ansible_os_family == "RedHat" and ansible_lsb.major_release == "7"

```

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[Matt Martz]

Additionally you can make syslog_service a dictionary value with keys for the different versions:

vars/main.yml

syslog_service:

    "6": syslog

    "7": rsyslog

Then just do:

- name: Ensure syslog is running

  service: name="{{ syslog_service[ansible_distribution_major_version] }}" state=running enabled=yes

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Matt Martz
@sivel
sivel.net

[ZillaYT]

Much better solution. Thanks!

I ended up doing this

- include_vars: "roles/syslog/vars/{{ ansible_os_family }}-{{ ansible_distribution_major_version }}.yml"

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