Modify the keepalived configuration file location and the output path of the redirected keepalived log

The last blog post focuses on how to use keepalived to implement dual-machine hot standby for tomcat servers. This blog is an extension of the previous blog post, mainly about how to modify the path of the default profile of the keepalived and the output path of the redirected keepalived log. For information on how to install keepalived and keepalived installation path issues, refer to the previous blog post.

Keepalived The default profile path is/etc/keepalived/keepalived.conf

Keepalived The default log file is saved in/var/log/messages

Sometimes it is necessary to modify these file paths to a suitable location because of the actual needs, such as the path planning of the project.

First look at the/etc/sysconfig/keepalived file.

# Options for keepalived. keepalived--help ' Output and keepalived (8) and
# keepalived.conf (5) Man pages for a list of all options. Here are the most
# common ones:
#
--VRRP               -P only    run with VRRP subsystem.
#--check              -C is    run with Health-checker subsystem.
#--DONT-RELEASE-VRRP    -v dont remove VRRP VIPs & vroutes on daemon stop.
#--dont-release-ipvs    -i dont remove Ipvs topology on daemon stop.
#--dump-conf    -D dump the configuration data.
#--log-detail    -D Detailed log messages.
#--log-facility    -S 0-7 Set local syslog facility (Default=log_daemon)
#

keepalived_options= '-d '

Note that there is only one keepalived_options= "-D" in this file, which is the key to modifying the file path.

Here to add the keeaplived of the relevant knowledge

/usr/local/keepalived/sbin/keepalived --vrrp -P [Only run with VRRP subsystem.] 
/usr/local/keepalived/sbin/keepalived --check -C [Only run with Health-checker subsystem.] 
/usr/local/keepalived/sbin/keepalived --dont-release-vrrp -V [Dont remove VRRP VIPs & VROUTEs on daemon stop. ]
/usr/local/keepalived/sbin/keepalived --dont-release-ipvs -I [Dont remove IPVS topology on daemon stop. ]
/usr/local/keepalived/sbin/keepalived --dont-fork -n [Dont fork the daemon process. ]
/usr/local/keepalived/sbin/keepalived --use-file -f [Use the specified configuration file. Default is /etc/keepalived/keepalived.conf. ]
/usr/local/keepalived/sbin/keepalived --dump-conf -d [Dump the configuration data. ]
/usr/local/keepalived/sbin/keepalived --log-console -l [Log message to local console. ]
/usr/local/keepalived/sbin/keepalived --log-detail -D [Detailed log messages. ]
/usr/local/keepalived/sbin/keepalived --log-facility -S 0-7 [Set syslog facility to LOG_LOCAL[0-7]. (default=LOG_DAEMON) ]
/usr/local/keepalived/sbin/keepalived --help -h [Display this short inlined help screen. ]
/usr/local/keepalived/sbin/keepalived --version -v [Display the version number ]
/usr/local/keepalived/sbin/keepalived --pid -p [pidfile ]
/usr/local/keepalived/sbin/keepalived --checkers_pid -c [checkers pidfile ]
/usr/local/keepalived/sbin/keepalived --vrrp_pid -r [vrrp pidfile]

A careful reader may notice that "-D" is the option for the output log, and-f is the option to modify the default profile path.

The keepalived_options in/etc/sysconfig/keepalived is modified to:

KEEPALIVED_OPTIONS="-f [Configuration file path] -D"

The [config file path]] is the path to the keepalived configuration file you want to modify.

Also note that "-S" is required to modify the default path of the log file. The keepalived_options will be amended to read:

KEEPALIVED_OPTIONS="-f [Configuration file path] -D -S 0"

Here the "-s 0" means local0.* specific also need to look at the/etc/rsyslog.conf file:

# Log all kernel messages to the console.
# Logging much else clutters up the screen.
#kern.*                                                 /dev/console

# Log anything (except mail) of level info or higher.
# Don't log private authentication messages!
*.info;mail.none;authpriv.none;cron.none                /var/log/messages

# The authpriv file has restricted access.
authpriv.*                                              /var/log/secure

# Log all the mail messages in one place.
mail.*                                                  -/var/log/maillog


# Log cron stuff
cron.*                                                  /var/log/cron

# Everybody gets emergency messages
*.emerg                                                 *

# Save news errors of level crit and higher in a special file.
uucp,news.crit                                          /var/log/spooler

# Save boot messages also to boot.log
local7.*                                                /var/log/boot.log

See the last sentence:

local7.*                                                /var/log/boot.log

Also we can add in this file

local0.*/var/log/keepalived . log

This allows us to modify the log path.