Troubleshooting

exec

Problem:

In a Jenkinsfile, when running a docker exec -it command, it returns the following error and fails:

the input device is not a TTY

Cause:

A Jenkinsfile is run in a context which does not provide a TTY, which allows for immediate output from the shell to allow user interaction. By default, Jenkins uses non-TTY shells for the execution of Jenkinsfiles, in which case commands, which require and interactive shell (such as docker exec -it), fail.

Solution:

Make the docker exec command non-interactive by removing the -it options:

$ docker exec CONTAINER_NAME COMMAND [ARGUMENTS...]