How can I pass a external environment variable to drone docker runner? - drone.io

Question

The scene is: I want to exec docker run & push in docker runner, and the docker registry and docker runner is in same server. so I want to pass host ip as variable into drone pipeline container so I can push docker image without a remote registry server. But it seem that only drone allowable environment variable can be used in ‘${}’. I try to export EXTERNALIP in host machine and try to get ${EXTERNALIP} but got nothing.
so Is there some way I can get external ip for communicating to localhost or another way to achieve this?

Answer 1

You should be able to push to localhost if its on the same host, that said, I was not able to do this using the packages plugin but was able to to replicate using direct docker:
steps:
- name: docker-${DRONE_EVENT}
image: docker:19.03
when:
event: [ push, pull_request ]
status: [ success ]
environment:
DOCKER_PASSWORD:
from_secret: docker_password
commands:
- echo $DOCKER_PASSWORD | docker login --username user_name --password-stdin localhost
- docker build -t localhost/demo-web:latest .
- if [ "${DRONE_EVENT}" == "push" ]; then docker push localhost/demo-web:latest; fi;
volumes:
- name: docker-socket
path: /var/run/docker.sock
volumes:
- name: docker-socket
host:
path:
/var/run/docker.sock
Couple caveats, obviously you will need to have trusted access in the repo configuration or --trusted if using local exec. Enjoy!