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在配置system nginx服务后，对其nginx日志进行自定义并定时备份清理。

1. 配置systemd配置文件

$ mkdir  -p   /etc/systemd/system/nginx.service.d/
$ vim etc/systemd/system/nginx.service.d/nginx.conf
[Service]
SyslogIdentifier=nginx

2. rsyslog配置单独的日志

$ vim /etc/rsyslog.d/nginx.conf
if $programname == "nginx" then /var/log/nginx/nginx.log
& stop

3. logrotate配置定时备份并清理策略

$ vim /etc/logrotate.d/nginx
/var/log/nginx/nginx.log {
        weekly
        rotate 8
        missingok
        notifempty
        size 10M
        create 0644 root root
}

4. 重启服务

$ systemctl restart rsyslog
$ systemctl status nginx

5.查看日志是否生效

$  cat /var/log/nginx/nginx.log 
Jun 25 13:20:38 monitor1 nginx: /etc/rc.d/init.d/nginx: line 29: kill: /usr/local/nginx/sbin/nginx: arguments must be process or job IDs
Jun 25 13:20:38 monitor1 nginx: nginx is already running