sudo useradd -r -U -u 1234567 -g 1234567 -m -c "nexus role account" -d /sonatype-work -s /bin/false nexus

useradd: group '1234567' does not exist

sudo useradd -r -U -u 1234567 -m -c "nexus role account" -d /sonatype-work -s /bin/false nexus

Adding user `nexus' ...
Adding new group `nexus' (1234567) ...
Adding new user `nexus' (1234567) with group `nexus' ...
The home directory `/home/nexus' already exists.  Not copying from `/etc/skel'.
adduser: Warning: The home directory `/home/nexus' does not belong to the user you are currently creating.
Enter new UNIX password:
Retype new UNIX password:
No password supplied
Enter new UNIX password:
Retype new UNIX password:
No password supplied
Enter new UNIX password:
Retype new UNIX password:
No password supplied
passwd: Authentication token manipulation error
passwd: password unchanged
Try again? [y/N] n
Changing the user information for nexus
Enter the new value, or press ENTER for the default
    Full Name []: Nexus
    Room Number []:
    Work Phone []:
    Home Phone []:
    Other []:
Is the information correct? [Y/n] y

sudo groupadd -r -g 1234567 nexus
  && sudo useradd -r -u 1234567 -g 1234567 -m -c "nexus role account" -d /sonatype-work -s /bin/false nexus

[root@centos4]# useradd -U -u 200 -g 200 -m -d /home/ansible -s /usr/bin/bash ansible
useradd: group '200' does not exist

[root@centos4]# useradd -U -u 200 -m -d /home/ansible -s /usr/bin/bash ansible
[root@centos4]# egrep ansible /etc/passwd
ansible:x:200:1000::/home/ansible:/usr/bin/bash
[root@centos4]# egrep ansible /etc/group
ansible:x:1000: