Detailed explanation of configuring keepalived log to another path in centos7

Keepalived installation:

cd <keepalived_sourcecode_path>
./configure --prefix=/usr/local/keepalived
 
make && make install
 
mkdir /etc/keepalived
mkdir /etc/keepalived/scripts
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /root/keepalived-2.0.6/keepalived/etc/init.d/keepalived /etc/init.d/
cp /usr/local/keepalived/sbin/keepalived /sbin/keepalived
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
chmod +x /etc/init.d/keepalived

Since keepalived logs are written to /var/log/message by default, we need to strip it out.

In centos 6 you can:

(1) First modify the /etc/sysconfig/keepalived file, comment out the following, and add the following:

#KEEPALIVED_OPTIONS="-D"
KEEPALIVED_OPTIONS="-D -d -S 0" 

(2) Next, modify the /etc/rsyslog.conf file and add the following:

local0.* /var/log/keepalived.log

Under centos 7, you also need to modify the /lib/systemd/system/keepalived.service file:

Used on centos 7. Because centos 7 uses systemctl and calls service through systemctl, you need to modify the /lib/systemd/system/keepalived.service file.

Put the following inside:

EnvironmentFile=-/usr/local/keepalived/etc/sysconfig/keepalived
ExecStart=/usr/local/keepalived/sbin/keepalived $KEEPALIVED_OPTIONS

Modified to:

EnvironmentFile=/etc/sysconfig/keepalived
ExecStart=/sbin/keepalived $KEEPALIVED_OPTIONS

Then reload the service:

systemctl daemon-reload

The overall idea is,

1. Start via systemctl start keepalived;

2. When starting keepalived, it will read the service configuration file: /lib/systemd/system/keepalived.service;

3. In the service configuration file:

3.1 Startup file path ExecStart=/sbin/keepalived $KEEPALIVED_OPTIONS, that is, the startup method is to start with the parameters in the environment variable file;

3.2 Read the environment variable parameter EnvironmentFile=/etc/sysconfig/keepalived.

4. The $KEEPALIVED_OPTIONS parameter is configured in /etc/sysconfig/keepalived; we configured KEEPALIVED_OPTIONS="-D -d -S 0"; -S is the facility of syslog, 0 means local0, configure local0.* /var/log/keepalived.log in /etc/rsyslog.conf

5. Therefore, the log is written to /var/log/keepalived.log.

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