How to join a group and update environment during live session

Join a group and update environment during live session.

I will join a docker group and use docker client during live session.

Inspect current groups.

$ groups

milosz adm cdrom sudo dip plugdev lpadmin lxd sambashare

$ id

uid=1000(milosz) gid=1000(milosz) groups=1000(milosz),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),122(lpadmin),133(lxd),134(sambashare)

Try to use docker client.

$ docker ps

Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/json": dial unix /var/run/docker.sock: connect: permission denied

Join a docker group.

$ echo $USER

milosz

$ sudo usermod -aG docker $USER

Update environment to reflect this change.

$ newgrp docker

Inspect current groups.

$ id

uid=1000(milosz) gid=140(docker) groups=140(docker),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),122(lpadmin),133(lxd),134(sambashare),1000(milosz)

Update environment again to fix current GID.

$ newgrp -

Inspect current groups.

$ id

uid=1000(milosz) gid=1000(milosz) groups=1000(milosz),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),122(lpadmin),133(lxd),134(sambashare),140(docker)

$ groups

milosz adm cdrom sudo dip plugdev lpadmin lxd sambashare docker

Use docker client.

$ docker ps

CONTAINER ID   IMAGE                    COMMAND                  CREATED       STATUS                PORTS                                       NAMES
e6caef079f86   louislam/uptime-kuma:1   "/usr/bin/dumb-init …"   4 weeks ago   Up 6 days (healthy)   0.0.0.0:3001->3001/tcp, :::3001->3001/tcp   uptime-kuma
cc9f2a1492e9   lissy93/dashy:2.0.7      "/sbin/tini -- yarn …"   4 weeks ago   Up 6 days (healthy)   0.0.0.0:8080->80/tcp, :::8080->80/tcp       my-dashboard

That was easy and you do not need to login again.