VPP image running is taken from master from around 5/25/17 on a CentOS 7 server. I created a new user and added the user to vpp group. Then try to run a command. Prompted for 'sudo' password.

I have vpp group in my startup file:

# vi /etc/vpp/startup.conf
:
api-segment {
  gid vpp
}
:

Created new user and added to VPP group:

# useradd larry
# passwd larry
# usermod -a -G vpp larry

Logged in as new user 'larry':

$ groups larry
larry : larry vpp

vpp_api_test works as expected.

$ vpp_api_test
vat# exec sh interface
              Name               Idx       State          Counter          Count     
GigabitEthernet7/0/0              1        down      
vat# quit

However vppctl requires root access. It prompts me for 'sudo' passwd. I enter password for 'larry' because that user doesn't have sudo privileges and no output.

$ vppctl show interface
[sudo] password for larry: 

$ vppctl
vpp# show interface
[sudo] password for larry: 

vpp#