The groupadd manpage gives this clue:
The default is to use the smallest ID value greater than or equal to
GID_MIN and greater than every other group.
Maybe you have a group numbered GID_MAX or more already? 60000,
according to the manpage.
On Wed, Sep 02, 2015 at 09:42:29PM +0100, isdtor wrote:
> The munin rpms from EPEL failed to install correctly on a particular
> machine. This is why
>
> # /usr/sbin/groupadd -r munin
> groupadd: Can't get unique system GID (no more available GIDs)
> #
>
> but I don't understand why this happens. Even after checking the man pages
> for groupadd and login.defs, I have been unable to determine what the
> settings for SYS_GID_MIN/SYS_GID_MAX on RHEL/CentOS are. None of the 5/6
> machines I have access to list them in login.defs. Even assuming
> relatively conservative values of 201/499, resp. (examples from other
> distros include 101/999), this doesn't add up.
>
> # grep munin /etc/group
> # ypmatch munin group
> # wc -l /etc/group
> 100 /etc/group
> # grep SYS_GID /etc/login.defs
> #
>
> Any ideas? Information seems to be pretty thin on the ground.
>
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