解决fatal open lock file /var/lib/postfix/master.lock cannot open file Permission denied

安装postfix出现错误如下:

Apr 5 11:50:59 muxiaoshuai postfix/postfix-script[30510]: warning: not owned by postfix: /var/lib/postfix/./master.lock
Apr 5 11:55:46 muxiaoshuai postfix/postfix-script[3751]: warning: not owned by postfix: /var/lib/postfix/./master.lock
Apr 5 11:55:46 muxiaoshuai postfix/postfix-script[3765]: starting the Postfix mail system
Apr 5 11:55:46 muxiaoshuai postfix/master[3766]: fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied

解决办法是创建目录 /var/lib/postfix/. 和创建文件 /var/lib/postfix/master.lock. 然后给这个目录和子文件文件夹 777 权限, 重新启动postfix搞定.