Writing to System Logs Post: 302750861

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Operating Systems Linux Red Hat Writing to System Logs Post 302750861 by thmnetwork on Wednesday 2nd of January 2013 04:26:38 PM

01-02-2013

Registered User

syslog generally keeps its destination files open:

Code:

[root@localhost log]# fuser maillog
maillog:              4648
[root@localhost log]# ps -efa | grep 4648
root      4648     1  0  2012 ?        00:00:01 syslogd -m 0
root     11294  9649  0 16:20 pts/0    00:00:00 grep 4648
[root@localhost log]#

Obviously two programs can't/shouldn't be writing to the same file. There are also syslog-specific reasons for not wanting to do it this way: What if I'm doing a remote syslog? If you're logging directly to files you don't get to take advantage of that and if you want to build that funtionality in yourself then your job is just that much harder. What if the sysadmin wants your logs to go to two different files? etc, etc.

These are the problems the syslog daemon was created to resolve: make a single program broker access to the logging system, then you can solve common problems in one place and in a way that doesn't lead to programs clobbering the work of others.

Most languages have syslog bindings anyways so there's very little reason to want to do it a different way.

thmnetwork

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fasthalt

fasthalt(8)						      System Manager's Manual						       fasthalt(8)

NAME

       fasthalt - Halts the system

SYNOPSIS

       /usr/sbin/fasthalt [-lnq]

DESCRIPTION

       The  fasthalt command halts the system and flags a subsequent reboot to skip the execution of fsck.  The program creates the fastboot file,
       then invokes the halt program.  The system start-up script contains instructions to look for the fastboot file.	 If  present,  the  script
       removes the file and skips the invocation of the fsck command.

       If  the command is invoked without the -l, -n, or -q flag, the halt program logs the shutdown using the syslogd command and places a record
       of the shutdown in the login accounting file, /var/adm/wtmp.  Using the -q and the -n flags imply the -l flag.

       You must have root privileges to use this command.

FLAGS

       Does not log the halt using syslog.  Prevents the sync before stopping, and does not log the halt using syslog.	Causes a quick halt,  does
       not log the halt using syslog, and makes no attempt to kill all processes.

FILES

       Specifies the command path Specifies the path of the syslog daemon

RELATED INFORMATION

       Commands:  fsck(8), halt(8), syslogd(8)

       Functions: sync(2), syslog(3) delim off

																       fasthalt(8)