[pve-devel] [RFC cluster] pmxcfs startup: order before MTAs
Aaron Lauterer
a.lauterer at proxmox.com
Mon Sep 5 14:06:02 CEST 2022
If the systemd ordering is okay, what about how we have with Ceph, where we
place the "ceph-after-pve-cluster.conf" for each service instead of changing the
pve-cluster.service?
See my recent patch regarding this [0].
[0] https://lists.proxmox.com/pipermail/pve-devel/2022-July/053546.html
On 9/5/22 13:58, Stoiko Ivanov wrote:
> currently pmxcfs and the running mta (postfix in most cases I assume)
> have no ordering between them - resulting in the mta starting before
> pmxcfs.
>
> This can be problematic in case of a mail for 'root' being in the
> mailq: postfix tries to deliver the mail - pvemailforward tries to
> look up the destination address in /etc/pve/user.cfg and gets a
> connection refused since pmxcfs is not running yet.
>
> reported via our community-forum:
> https://forum.proxmox.com/threads/.108893/
>
> Signed-off-by: Stoiko Ivanov <s.ivanov at proxmox.com>
> ---
> sending as RFC, since while thinking about this issue and discussing it
> off-list (thx @Fiona!) the following alternative approaches were/are
> considered:
> * letting pvemailforward.pl exit with an error-code - sadly does not work
> as the only difference is that postfix generates a bounce for the mail
> and in (the most-common) case of root being the sender that bounce is
> also undeliverable, and thus dropped
> * the fix through systemd-ordering does work for this case - but seems
> not quite fitting (after all pmxcfs and postfix can happily exist w/o
> the other - only delivering mail to root does not work) - also
> the issue also happens if pmxcfs is not available for other reasons
> * an alternative approach would be to retry fetching the information from
> pmxcfs a few times (afair postfix' command-timeout is 1000s for this),
> e.g. like we do in the installer when looking for the correct ISO.
>
> debian/pve-cluster.service | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/debian/pve-cluster.service b/debian/pve-cluster.service
> index 4327055..fb706be 100644
> --- a/debian/pve-cluster.service
> +++ b/debian/pve-cluster.service
> @@ -5,6 +5,7 @@ Wants=corosync.service
> Wants=rrdcached.service
> Before=corosync.service
> Before=cron.service
> +Before=postfix.service exim4.service sendmail.service qmail.service
> After=network.target
> After=sys-fs-fuse-connections.mount
> After=time-sync.target
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