Bug#762700: systemd: journald fails to forward most boot messages to syslog

[Michael Biebl]

Am 02.03.2015 um 15:42 schrieb Christian Seiler:

>  - SOLUTION (mostly the same as before, but SendBuffer is set on a
>    different unit and a Condition is added to the service):
> 
>       1. Increase max_dgram_qlen to a reasonable value. The easiest
>          way is via a systemd service:
> 
>          /lib/systemd/system/systemd-setup-dgram-qlen.service:
>          [Unit]
>          DefaultDependencies=no
>          Before=syslog.socket
>          ConditionPathIsReadWrite=/proc/sys/net/unix/max_dgram_qlen
> 
>          [Service]
>          Type=oneshot
>          ExecStart=/sbin/sysctl -w net.unix.max_dgram_qlen=512
>          StandardOutput=null

A proper Description= is missing and it probably should have
RemainAfterExit=yes.
That said, why not simply use a sysctl.d conf snippet?


>          Add the following to /lib/systemd/systemd/syslog.socket:
>          Wants=systemd-setup-dgram-qlen.service



>       2. Make it even more robust by applying the patch from upstream
>          to increase the send buffer on the socket journald uses to
>          forward syslog messages, i.e. add
>          SendBuffer=8M
>          to /lib/systemd/system/systemd-journald-dev-log.socket
>          (NOT syslog.socket!)
> 
> (As said before, the values 512 and 8M are debatable, although 8M is
> typically used within systemd's source code, so it's probably a good
> value to use. 512 seems like a reasonable compromise to me: typically,
> up to ~ 100 boot messages will be generated before syslog is started
> on systems I've tried this on, so using something that's 5x higher
> seems like a good safety net without increasing this to crazy high
> numbers. Note that the 8M limit will apply independently.)
> 
> I've been using this on a Jessie system for the past couple of days
> (well, drop-ins in /etc, actually), and I didn't notice any
> side-effects so far.

Did you run it with 1. and 2. applied, or only 1.?


-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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