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Usermod doesn't work on root

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Operating Systems Linux Red Hat Usermod doesn't work on root
# 1  
Old 08-16-2013
Usermod doesn't work on root
Hi, I am root user. I need to add more groups to the account. I usse the below command but no apparent result

Code:
[root@hostname ~]# id
uid=0(root) gid=0(root) groups=0(root)
[root@hostname ~]# usermod -a -G 302,301,303 root
[root@hostname ~]# id
uid=0(root) gid=0(root) groups=0(root)
[root@hostname ~]#

What can be the reason?
Last edited by Scrutinizer; 08-16-2013 at 07:08 AM.. Reason: code tags
# 2  
Old 08-16-2013
The name service cache daemon might interfere. Try to clear the cache with

Code:
nscd -i group
nscd -i passwd

---------- Post updated at 12:10 ---------- Previous update was at 12:05 ----------

Ah, and you should logout and login again, of course Smilie
# 3  
Old 08-16-2013
[root@hostname ~]# nscd -i group
[root@hostname ~]# id
uid=0(root) gid=0(root) groups=0(root)

Unfortunately issue is still there.

logged out and back on with root and user still doesn't have gruops.
# 4  
Old 08-16-2013
Code:
admin:/root # id
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
admin:/root # id root
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
admin:/root # usermod -a -G 72 root
admin:/root # id
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
admin:/root # id root
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),72(tcpdump)
admin:/root # exit
admin:/home/hergp $ sudo -i
admin:/root # id
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),72(tcpdump)

# 5  
Old 08-16-2013
"sudo -i" didn't switch user. I tried the rest - unfortunately no luck.

[root@hostname bin]# id
uid=0(root) gid=0(root) groups=0(root)
[root@hostname bin]# usermod -a -G 301,303,302 root
[root@hostname bin]# id root
uid=0(root) gid=0(root) groups=0(root)
[root@hostname bin]# exit
logout
tmproot@hostname>sudo -i [here it didn't switch to root]
tmproot@hostname>su - root
[root@hostname ~]# id
uid=0(root) gid=0(root) groups=0(root)

I wonder if this could be because of any puppet or LDAP setting?
# 6  
Old 08-16-2013
Try adding the groups using the -a option to gpasswd.
# 7  
Old 08-16-2013
This one fails saying the group I want to add doesn't exist in /etc/group
Actually this gives the clue that most of our groups and account are created in LDAP. I think the reason I can't add root user to additional group because they don't locally exist on the host.
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