[root@cvm-3ifib572da225 yi]# groupadd redis 
groupadd: group 'redis' already exists 
[root@cvm-3ifib572da225 yi]# useradd -g redis -s /sbin/nologin redis 
useradd: existing lock file /etc/passwd.lock without a PID 
useradd: cannot lock /etc/passwd; try again later. |   
 
 
 
 
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