Dependency conundrum

[Tom Limoncelli]

I'm having a problem getting some dependencies exactly right.

This is the code I originally wrote:

    File['/usr/lib/systemd/system/patcher-client.service']~>Exec['systemctl daemon-reload']~>Service['patcher-client']

It works great except... oops... if any other module does Exec['systemctl daemon-reload'], then Service['patcher-client'] restarts.  That additional restart is unneeded.

I thought about rewriting it as:

    File['/usr/lib/systemd/system/patcher-client.service']~>Exec['systemctl daemon-reload']

    File['/usr/lib/systemd/system/patcher-client.service']~>Service['patcher-client']

But then how would Puppet know to do the Exec[] before the Service[]?  I could add:

    Exec['systemctl daemon-reload']->Service['patcher-client']

But then we're basically in the same situation as the original code. Right?

I guess I kind of want something like this: (not real syntax)

    File['/usr/lib/systemd/system/patcher-client.service']~> ( Exec['systemctl daemon-reload']~>Service['patcher-client'] )

How do I achieve that?

Thanks in advance,

Tom

--

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[Christopher Wood]

Sounds like tags and chaining, did something similar for upstart.

file { '/usr/lib/systemd/system/patcher-client.service':
notify => Service['patcher-client'],
tag => ['reload systemd'],
}

File <| tag == 'reload systemd' |> ~> Exec['systemctl daemon-reload']

Exec['systemctl daemon-reload'] -> Service <| |>

Originally (on centos6 where upstart+sysvinit is combined):

class upstart {

$upstartreload = '/sbin/initctl reload-configuration'

exec { $upstartreload:
refreshonly => true,
}

File <| tag == 'upstart' |> ~> Exec[$upstartreload]
Exec[$upstartreload] -> Service <| tag == 'upstart' |>

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[Ramin K]

Maybe I've missed something, but I don't see why your second example
doesn't work.

# Our order and notify relationships
File['patcher-client.service'] ~> Exec['systemctl daemon-reload']
File['patcher-client.service'] ~> Service['patcher-client']

# Our order only relationships

Exec['systemctl daemon-reload'] -> Service['patcher-client']

Ramin

On 6/15/17 7:59 AM, Tom Limoncelli wrote:
> I'm having a problem getting some dependencies exactly right.
>
> This is the code I originally wrote:
>
>
> File['/usr/lib/systemd/system/patcher-client.service']~>Exec['systemctl
> daemon-reload']~>Service['patcher-client']
>

> It works great except... oops... if any *other* module does

> Exec['systemctl daemon-reload'], then Service['patcher-client']
> restarts. That additional restart is unneeded.
>
> I thought about rewriting it as:
>
>
> File['/usr/lib/systemd/system/patcher-client.service']~>Exec['systemctl
> daemon-reload']
>
> File['/usr/lib/systemd/system/patcher-client.service']~>Service['patcher-client']
>
> But then how would Puppet know to do the Exec[] before the Service[]? I
> could add:
>
> Exec['systemctl daemon-reload']->Service['patcher-client']
>
> But then we're basically in the same situation as the original code. Right?
>
> I guess I kind of want something like this: (not real syntax)
>
> File['/usr/lib/systemd/system/patcher-client.service']~> (
> Exec['systemctl daemon-reload']~>Service['patcher-client'] )
>
> How do I achieve that?
>
> Thanks in advance,
> Tom
>
> --

> Email: t...@whatexit.org <mailto:t...@whatexit.org> Work:
> tlimo...@StackOverflow.com
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[Pete Brown]

I found a systemd module on puppet forge which works well.

It sets up an exec to run systemd reload whenever your systemd config files change.

https://forge.puppet.com/eyp/systemd

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