keepalived 安装：
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cd <keepalived_sourcecode_path>./configure --prefix=/usr/local/keepalived make && make install mkdir /etc/keepalivedmkdir /etc/keepalived/scriptscp /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/keepalivedcp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/chmod +x /etc/init.d/keepalived |
由于在默认状态下keepalived的日志会写入到/var/log/message中，我们需要将此剥离出来。
在centos 6下可以：
（1）首先修改/etc/sysconfig/keepalived文件，注释掉如下，添加如下：
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#KEEPALIVED_OPTIONS="-D"KEEPALIVED_OPTIONS="-D -d -S 0" |
（2）其次修改 /etc/rsyslog.conf 文件，添加如下：
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local0.* /var/log/keepalived.log |
在centos 7 下，还需要修改/lib/systemd/system/keepalived.service 文件：
centos 7使用。因为centos 7使用systemctl，通过systemctl调用service，所以需要修改/lib/systemd/system/keepalived.service文件。
将里面的：
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EnvironmentFile=-/usr/local/keepalived/etc/sysconfig/keepalivedExecStart=/usr/local/keepalived/sbin/keepalived $KEEPALIVED_OPTIONS |
修改成：
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EnvironmentFile=/etc/sysconfig/keepalivedExecStart=/sbin/keepalived $KEEPALIVED_OPTIONS |
然后重新加载service：
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systemctl daemon-reload |
整体的思路就是，
1. 通过systemctl start keepalived去启动；
2. 启动keepalived的时候，会去读service的配置文件：/lib/systemd/system/keepalived.service；
3. 在service的配置文件时：
3.1 启动文件路径ExecStart=/sbin/keepalived $KEEPALIVED_OPTIONS，即启动方式是带环境变量文件中参数来启动；
3.2 读取环境变量参数EnvironmentFile=/etc/sysconfig/keepalived。
4. $KEEPALIVED_OPTIONS参数是在/etc/sysconfig/keepalived的配置；我们配置的是KEEPALIVED_OPTIONS="-D -d -S 0"；而-S是syslog的facility，0表示放在local0，在/etc/rsyslog.conf 中配置local0.* /var/log/keepalived.log
5. 所以，写日志就去/var/log/keepalived.log了。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://oracleblog.org/working-case/relocate-keepalived-log-in-centos7
