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Add instructions on how to inject custom environment variables into a container.

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Closes: #1053
Approved by: rhatdan
This commit is contained in:
Martin Etmajer
2017-07-20 18:04:30 +02:00
committed by Atomic Bot
parent 898e762c4c
commit 2ecc4e1775
1 changed files with 10 additions and 0 deletions
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docs/atomic-run.1.md
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@@ -54,6 +54,16 @@ These defaults are suggested values for your container images.
**RUN_OPTS**
Content of file specified by `LABEL RUN_OPTS_FILE`. During `atomic install`, the `install.sh` can populate the file with any additional options that need to be passed to `docker run`, for example `--hostname=www.example.test` or `--net host`. The file name undergoes environment variable expansion, so for example `LABEL RUN_OPTS_FILE '/var/lib/${NAME}/docker-run-opts'` can be used to store per-container configuration.
Custom environment variables can be provided to the container through the LABEL RUN instruction as follows:
`LABEL RUN /usr/bin/docker run -t -i --rm -e FOO="\${FOO:-bar}" -v \${LOGDIR}:/var/log -v \${DATADIR}:/var/lib --name \${NAME} \${IMAGE}`
`atomic run` will run the following:
`/usr/bin/docker run -t -i --rm -e FOO="${FOO:-bar}" -v ${LOGDIR}:/var/log -v ${DATADIR}:/var/lib --name ${NAME} ${IMAGE}`
The value of `FOO` can be set explicitly via `FOO=baz atomic run`.
# OPTIONS:
**-h** **--help**
Print usage statement