I cannot add user to a group permanently

[Xuwen Fang <fxuwen@xxxxxxxxx>]

Hello Everyone,

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?
Thanks.

Sincerely,
Xuwen
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