Hi,
> On 19 May 2026, at 10:07 PM, Steve Shockley <[email protected]>
> wrote:
>
> Hi, I'm using OpenBSD 7.8 and -current, and for a variety of reasons I'm
> using Net-SNMPD instead of the built-in one. Previously I was forwarding
> from net_snmpd using proxy to snmpd listening on localhost. I recently
> discovered snmpd_metrics, which seems to do something similar without
> worrying about which oids to forward.
>
> If I add agentx to the net_snmpd config and run snmpd_metrics -d -v, it works
> great and I can see all the queries. The documentation is a little sparse,
> but I discovered in the initial commit message (end of
> https://cvsweb.openbsd.org/log/src/libexec/snmpd/snmpd_metrics/mib.c,v) that
> it needs to be run as a daemon.
>
> Is a template available for rc.d? I can write one myself, but what user
> should it run as?
You can check the /etc/rc.d directory. Looking at the tree, something like
this should do (/etc/rc.d/net_snmpd):
```
#!/bin/ksh
#
# <description>
daemon="/usr/local/sbin/snmpd"
daemon_flags="-u _netsnmp -I -p /var/run/net_snmpd.pid"
# or skip IPv6: daemon_flags="-u _netsnmp -I -ipv6 -p /var/run/net_snmpd.pid"
. /etc/rc.d/rc.subr
rc_pre() {
install -d -o _netsnmp -g _snmpd -m 0770 /var/agentx
}
rc_reload=NO # apparently not supported, use `restart`
rc_cmd $1
```
I'd go with a dedicated user e.g.
`_netsnmp': `useradd -s /sbin/nologin -d /nonexistent _netsnmp`
> I noticed if snmpd_metrics is running and net_snmpd restarts, it prints
> [fd:4]: lost connection: Connection reset by peer
> Failed to connect to snmpd: Permission denied
> Failed to connect to snmpd: Permission denied
>
> and never recovers. Is there a way to make snmpd_metrics "depend" on
> net_snmpd so if net_ restarts it also restarts _metrics? (Or should it be
> able to recover from that?)
The rc system supports order through the “pkg_scripts” keyword[1], but
not that kind of scenario. So you can do something like:
> I noticed if snmpd_metrics is running and net_snmpd restarts, it prints
> [fd:4]: lost connection: Connection reset by peer
> Failed to connect to snmpd: Permission denied
> Failed to connect to snmpd: Permission denied
>
> and never recovers. Is there a way to make snmpd_metrics "depend" on
> net_snmpd so if net_ restarts it also restarts _metrics? (Or should it be
> able to recover from that?)
But that's for the boot process only. AFAIK only systemd does take care
the scenario you described. Maybe a cron script with the following
logic: when App1 PID changes, restart App1.
Kind regards,
[1] https://man.openbsd.org/rc.conf.8 and
--
Panagiotis (atmosx) Atmatzidis
