ps showing user id not username

Posted on 2006-11-21
Last Modified: 2009-08-06

I'm having this really odd problem with the test cluster (Ubuntu/Dapper + heartbeat 2.0.7) that I'm currently setting up.

I think the following summises it nicely:-

# id hacluster
uid=105(hacluster) gid=111(haclient) groups=111(haclient)

# grep hacluster /etc/passwd
hacluster:x:105:111:Heartbeat System Account,,,:/usr/lib/heartbeat:/bin/false

# grep hacluster /etc/shadow
hacluster:<snip - was valid hash!>:13412:0:99999:7:::

# ps -ef | grep heart
root      4767     1  0 13:51 ?        00:00:00 heartbeat: master control process
root      4804  4767  0 13:51 ?        00:00:00 heartbeat: FIFO reader      
root      4805  4767  0 13:51 ?        00:00:00 heartbeat: write: bcast eth1
root      4806  4767  0 13:51 ?        00:00:00 heartbeat: read: bcast eth1
105       4849  4767  0 13:55 ?        00:00:00 /usr/lib/heartbeat/ccm
105       4850  4767  0 13:55 ?        00:00:13 /usr/lib/heartbeat/cib
nobody    4851  4767  0 13:55 ?        00:00:00 /usr/lib/heartbeat/lrmd
root      4852  4767  0 13:55 ?        00:00:00 /usr/lib/heartbeat/stonithd
105       4853  4767  0 13:55 ?        00:00:00 /usr/lib/heartbeat/attrd
105       4854  4767  0 13:55 ?        00:00:00 /usr/lib/heartbeat/crmd
root      4855  4767  0 13:55 ?        00:00:01 /usr/lib/heartbeat/mgmtd -v
105       4856  4767  0 13:55 ?        00:00:00 /usr/lib/heartbeat/pingd -h -m 100 -d 5s

As you can see 'ps -ef' isn't showing hacluster but instead is showing the uid of 105.

Also worth noting is that heartbeat is telling these processes to run as "hacluster" so it's getting that bit right, it's almost as if it can't reverse lookup the userid but I'm just guessing now!

Any ideas are most appreciated...
Question by:kennym141282

Expert Comment

ID: 17988004
maybe a shot in the dark here, is there a user and group named hacluster?

Expert Comment

ID: 17988698
Remove the following two lines from your /etc/nscd.conf file:

enable-cache passwd no
enable-cache group no

Then restart the nscd service.

Author Comment

ID: 17993943
# apt-cache policy nscd
  Installed: (none)
  Candidate: 2.3.6-0ubuntu20
  Version table:
     2.3.6-0ubuntu20 0
        500 dapper/universe Packages

nscd isn't installed...


# grep hacluster /etc/group

It's really puzzling!
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Expert Comment

ID: 17995633
what if   cat /etc/passwd | grep -i 105

Expert Comment

ID: 18000689
Sources are here:

It uses getpwuid(uid) to get the name.  So, the issue is down in that library.

Here's one version of that source:
getpwuid.c -
__getwpent.c -

Possible reasons:
The line in passwd may be malformed.

Maybe you're not  using that version of getpwuid above.  Are you on an LDAP based network?  Then you might be using different libraries, and the libraries aren't reading /etc/passwd.

Author Comment

ID: 18003637
I am on an LDAP based network, but, nsswitch.conf shows the following:-

passwd:         files ldap
group:          files ldap
shadow:         files ldap

Accepted Solution

TraskAdam earned 350 total points
ID: 18025159
I think it's because the hacluster is longer than 8 chars so ps shows the uid rather than truncating the username.

[root@localhost /root]# useradd -c '8 Chars' abcdefgh
[root@localhost /root]# useradd -c '9 Chars' abcdefghi
[root@localhost /root]# grep ^abc /etc/passwd
abcdefgh:x:502:502:8 Chars:/home/abcdefgh:/bin/bash
abcdefghi:x:503:503:9 Chars:/home/abcdefghi:/bin/bash
[root@localhost /root]# su - abcdefghi -s /bin/bash -c '(sleep 10m &)'
[root@localhost /root]# su - abcdefgh -s /bin/bash -c '(sleep 10m &)'
[root@localhost /root]# ps -ef | grep sleep
503      11019     1  0 13:15 ?        00:00:00 sleep 10m
abcdefgh 11060     1  0 13:15 ?        00:00:00 sleep 10m
root     11074 10562  0 13:15 pts/7    00:00:00 grep sleep
[root@localhost /root]#

You can explicitly specify the format you want ps to use to overcome this....

[root@localhost /root]# ps -eo user=WIDE-USER-COLUMN -o pid,ppid,c,stime,tty,time,cmd | grep sleep
abcdefghi        12009     1  0 13:27 ?        00:00:00 sleep 10m
abcdefgh         12050     1  0 13:27 ?        00:00:00 sleep 10m
root             12057 10562  0 13:27 pts/7    00:00:00 grep sleep
[root@localhost /root]#


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