CentOS6日志缺省保存4周，时间太短。为了保存log更久，从4周修改周期为24个月。
1.修改配置logrotate.conf
[root@D65 etc]# vi /etc/logrotate.conf
–# rotate log files weekly
##weekly
monthly
–# keep 4 weeks worth of backlogs
##rotate 4
rotate 24
2.重启服务syslog
[root@D65 etc]# service rsyslog restart
Shutting down system logger: [ OK ]
Starting system logger: [ OK ]
[root@D65 etc]# service –status-all |grep log
query logging is ON
rsyslogd (pid 5342) is running…
3.显示日志
–# tail /var/log/messages
[root@D65 etc]# tailf /var/log/messages
Sep 12 10:44:58 D65 kernel: Kernel logging (proc) stopped.
Sep 12 10:44:58 D65 rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-
pid="1361" x-info="http://www.rsyslog.com"] exiting on signal 15.
Sep 12 10:44:58 D65 kernel: imklog 5.8.10, log source = /proc/kmsg started.
Sep 12 10:44:58 D65 rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-
pid="5342" x-info="http://www.rsyslog.com"] start
