[JENKINS-38986] Cannot run a docker push registry:image when slaves running on a swarm

Context :

Slaves are provisioned by a docker swarm
/var/run/docker.sock mounted in slaves containers
Slaves base image contains a readable docker.json with auth correctly configured

A shell step with docker push <registry>:<image> fails with permission denied.

This is due to the DOCKER_HOST variable that is set during exec, the docker engine doesn't use the local docker.sock & local docker.json config.

Removing this variable with unset DOCKER_HOST before the docker push solves the issue.

I don't know if some people might need that variable but the behavior must be configurable somehow.

Pierre-Gildas MILLON created issue - 2016-10-14 10:54

Pierre-Gildas MILLON made changes - 2016-10-14 11:35

Component/s		New: docker-plugin [ 18724 ]
Component/s	Original: docker-slaves-plugin [ 20839 ]

Pierre-Gildas MILLON made changes - 2017-03-09 13:34

Resolution		New: Fixed [ 1 ]
Status	Original: Open [ 1 ]	New: Resolved [ 5 ]

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