topic Re: Centralize Logging in Operating System - Linux

Centralize Logging

Maaz — Sat, 15 Apr 2006 12:50:56 GMT

Dear Gurus

On one linux box(client)/etc/syslog.conf
user.* @logserver
#service syslog restart

On Log server /etc/sysconfig/syslog.conf
SYSLOGD_OPTIONS="-r -m 0"
#service syslog restart
#tail -f /var/log/messages

Ok, Logging is centrallize now, e.g on client machine i ran "startx" i can se messages on logserver.
But client machine still logs messages locally, and I want that client machine dont log message locally.
what more I have to do ?

Regards
Maaz

Re: Centralize Logging

Maaz — Sat, 15 Apr 2006 13:22:46 GMT

OS = rhel 4

and more thing left

1, I want to log /var/log/squid/access to a central log server say "logserver" (and not locally)
what Config should I have to do on the Squid server machine
2, I also want to log apache logs to a central log server say "logserver" (and not locally)
what Config should I have to do on the Apache server machine

Re: Centralize Logging

Vitaly Karasik_1 — Sun, 16 Apr 2006 02:11:38 GMT

Apache:
you should redirect apache logs to syslog, for example:

ErrorLog syslog:user

I don't sure that you can use the same way
CustomLog syslog:user combined

for access_log or you should use piping:
"CustomLog â | /usr/bin/logger â p user.infoâ

Of course, you can use localX facility instead of user.

(see for more http://httpd.apache.org/docs/2.0/mod/core.html)

Squid: you should start squid with "-s" flag for loggingg to syslog.

Rgds,
Vitaly

Re: Centralize Logging

Maaz — Sun, 16 Apr 2006 03:12:26 GMT

Thanks Dear Vitally Karasik

from my 1st post
Ok, Logging is centrallize now, e.g on client machine i ran "startx" i can se messages on logserver.
But client machine still logs messages locally, and I want that client machine dont log message locally.
what more I have to do ?

Plz help
Regards
Maaz

Re: Centralize Logging

Steven E. Protter — Sun, 16 Apr 2006 03:28:37 GMT

Shalom Maaz,

Two things to consider as I'm doing this right now.

I set up the logs directory on the central server as an NFS share.

Then I set up /etc/fstab to mount that NFS share at startup.

Then all logs go to that location.

Doing it in syslog requires that port 514 be open and that can be a problem with some firewall configurations.

I generally go with Vitaly's format (NFS or syslog) and keep the local copy of the log. The reason is that if there is a communication problem with the central log server, I still need those logs somewhere so I keep an extra copy.

You should take this into account in the logrotate configuration and have logrotate run not on the central server but on the individual servers around the network.

SEP

Re: Centralize Logging

Vitaly Karasik_1 — Sun, 16 Apr 2006 14:44:04 GMT

If you use "user" facility for apache's log and want to exclude such messages from local syslog file, in syslog.conf on your client machine you should use

!=user.* /var/log/messages

Unfortunately, I don't know is it possible to choose facility for squid log. If no, we cannot separate squid messages from the other daemons messages.