On 10/16/2016 04:57 AM, Xuwen Fang wrote: > I'm using a centos 7 server. I tried to add my own user to group 'apache' > and it works temporarily. When I ssh to it later, I found my user not a > member of group 'apache'. What's wrong with it? Are you using "newgrp"? That tool starts a new session wherein the user is a member of a new group. Permanent addition should be "usermod -a -G $group $user"