Christopher Friesen schrieb:
>
> I'm working on an embedded platform and we seem to be having a problem with
> syslog and logging to NFS-mounted files.
>
> We have syslog logging to NFS and also logging to a server on another machine.
> The desired behaviour is that if the NFS server or the net connection conks out,
> the logs are silently dropped. (Critical logs are also logged in memory that
> isn't wiped out on reboot.)
>
> Currently, /var/log is mounted with the following options:
> rw,rsize=4096,wsize=4096,timeo=7,retrans=3,bg,soft,intr
>
> We started off with hard mounts due to the warnings about soft mounts, but that
> led to boxes totally hanging when the network connections were pulled or the NFS
> server was taken down. In this scenario we are even unable to login as root at
> the console. This forced us to go to soft mounts in an attempt to fix this
> behaviour.
>
> The problem we are seeing is that if we lose the network connection or the NFS
> mount (which immediately causes an attempt to log the problem), it seems that
> syslog gets stuck in NFS code in the kernel and other stuff can be delayed for a
> substantial amount of time (many tens of seconds). Just for kicks we tried
> logging to ramdisk, and everything works beautifully.
>
> Now I'm a bit unclear as to why other processes are being delayed--does anyone
> have any ideas? My current theories are that either the nfs client code has a
> bug, or syslog() calls are somehow blocking if syslogd can't write the file
> out. I've just started looking at the syslog code, but its pretty rough going
> as there are very few comments.
>
> Help? We're running a customized 2.2.17 kernel and syslog 1.4.1.
>
I can recommend syslogd's ability to log to remote syslogd via
/etc/syslog.conf
*.info |host.or.ip
The remote site has to run syslogd with "syslogd -r".
Since it uses UDP there is no blocking.
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This archive was generated by hypermail 2b29 : Fri Nov 30 2001 - 21:00:35 EST