tar包解压后发现用户和用户组变成了数字，原因是没有这个ID对应的用户UID和用户组GID，手动创建即可

[root@localhost postgres]# ll
total 4
drwxr-xr-x 6 504 504 4096 Jun 9 09:34 pgsql
[root@localhost postgres]# useradd -u 504 -d /home/postgres -g postgres -m postgres
useradd: group ‘postgres’ does not exist
[root@localhost postgres]# groupadd -g 504 postgres
[root@localhost postgres]# useradd -u 504 -d /home/postgres -g postgres -m postgres
useradd: warning: the home directory already exists.
Not copying any file from skel directory into it.
[root@localhost postgres]# ll
total 4
drwxr-xr-x 6 postgres postgres 4096 Jun 9 09:34 pgsql
[root@localhost postgres]#

groupadd -g 504 postgres
useradd -u 504 -d /home/postgres -g postgres -m postgres