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Many processes are configured to work with syslog, but some important services have their own log configuration. For example, the Apache web server handles its own logs by specifying the names of the files that information has to be logged to in the Apache configuration files. And many other similar services don t use syslog, so, as an administrator, you always have to take a careful look at how logging is handled for each specific service.
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CHAPTER 3 PERFORMING ESSENTIAL SYSTEM ADMINISTRATION TASKS
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If you need logging from shell scripts, you can use the logger command, which writes log messages Tip
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directly to the syslog procedure. It s a useful way to write a failure in a shell script to a log file. For example, use logger this script completed successfully if you want to write to the log files that a script has completed successfully.
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Logging is good, but, if your system writes too many log files, it all can become rather problematic. Log files grow quite large and can rapidly fill your server s hard drive. As a solution to this, you can configure the logrotate service. This runs as a daily cron job, which means that it is started automatically and checks its configuration files to see whether any rotation has to occur. In these configuration files, you can configure when a new log file should be opened and, if so, what exactly should happen to the old log file: should it be compressed or just deleted And if it is compressed, how many versions of the old file should be kept You can use logrotate with two different kinds of configuration files. The main configuration file is /etc/logrotate.conf. In this file, generic settings are defined to tune how logrotate should do its work. Listing 3-9 shows the contents. Listing 3-9. Contents of the logrotate.conf Configuration File # see "man logrotate" for details # rotate log files weekly weekly # keep 4 weeks worth of backlogs rotate 4 # create new (empty) log files after rotating old ones create # uncomment this if you want your log files compressed #compress # uncomment these to switch compression to bzip2 compresscmd /usr/bin/bzip2 uncompresscmd /usr/bin/bunzip2 # former versions had to have the compress command set accordingly #compressext .bz2 # RPM packages drop log rotation information into this directory include /etc/logrotate.d
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CHAPTER 3 PERFORMING ESSENTIAL SYSTEM ADMINISTRATION TASKS
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# no packages own wtmp -- we'll rotate them here #/var/log/wtmp { # monthly # create 0664 root utmp # rotate 1 #} # system-specific logs may be also be configured here. In this example, some important keywords are used, and Table 3-2 describes them. Table 3-2. Options for logrotate
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weekly rotate 4 create compress compresscmd uncompresscmd include
Description
This option specifies that the log files should be created on a weekly basis. This option makes sure that the four previous rotations of the file are saved. If the rotate option is not used, old files are deleted. The old file is saved under a new name (for instance, Xorg.0.log would be changed to Xorg.0.log.old), and a new file is created. Use this option to make sure that the old log files are compressed. This option specifies the command to be used for creating the compressed log files. Use this command to specify what command to use to uncompress compressed log files. This important option makes sure that the content of the directory /etc/logrotate.d is included. In this directory, files exist that specify how to handle some individual log files.
As you have seen, the logrotate.conf configuration file includes some very generic code to specify how log files should be handled. In addition to that, most log files have a specific logrotate configuration file in /etc/logrotate.d/. The content of the service-specific configuration files in /etc/logrotate.d is generally more specific than the content of the generic logrotate.conf. Listing 3-10 shows the configuration script for files that are written by Apache to /var/log/apache2/. Listing 3-10. Example of the logrotate Configuration for Apache /var/log/apache2/*.log { weekly missingok rotate 52 compress delaycompress notifempty create 640 root adm sharedscripts postrotate if [ -f /var/run/apache2.pid ]; then
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