Using CentOs, I want to run a script as user 'training' as a system service. I use daemontools to monitor the process, which needs a launcher script that is run as root:
#!/bin/bash exec >> /var/log/training_service.log 2>&1 setuidgid training training_command
This last line is not good enough since for training_command, we need environment for training user to be set.
su - training -c 'training_command'
standard in must be tty' as su making sure tty is present to potentially accept password. I know I could make this disappear by modifying /etc/sudoers a la Bash & 'su' script giving an error "standard in must be a tty" but i am reluctant and unsure of consequences.
runuser - training -c 'training_command'
runuser: cannot set groups: Connection refused. I found no sense or resolution to this message.
ssh -p100 training@localhost 'source $HOME/.bashrc; training_command'
Host key verification failed. (the host key IS in known_hosts, etc).
Note: all of 2,3,4 work as they should if I run the wrapper script from a root shell. problems only occur if the system service monitor (daemontools) launches it (no tty terminal I guess).
I am stuck. Is this something so hard to achieve?
I appreciate all insight and guidance to best practice.