Run commands in parallel on deployed machines

maas-parallel.sh

# Run dist-upgrade all deployed machines running ubuntu
(maas admin machines read|jq -r '.[]|select((.status==6) and .osystem=="ubuntu").hostname')|\
  xargs -n1 -P0 bash -c 'ssh $0 "sudo 2>/dev/null bash -c '"'"'apt update;apt dist-upgrade -y;apt autoremove -y'"'"'"'


# Run dist-upgrade all deployed machines running ubuntu with a certain tag
# To see list of tags, run: maas admin tags read|jq -r '.[].name'
(maas admin tag machines ${TAG}|jq -r '.[]|select((.status==6) and .osystem=="ubuntu").hostname')|\
  xargs -n1 -P0 bash -c 'ssh $0 "sudo 2>/dev/null bash -c '"'"'apt update;apt dist-upgrade -y;apt autoremove -y'"'"'"'