How can I control a whole Supervisor group at once?
Solution 1:
Ah, you use supervisorctl start groupname:*
I discovered this by typing just supervisorctl start and being told:
Error: start requires a process name
start <name> Start a process
start <gname>:* Start all processes in a group
start <name> <name> Start multiple processes or groups
start all Start all processes
...similarly for stop and restart.