readme.md

Docker-Cron

Container to run other containers as cron jobs.

Usage

The following command will spawn a container named testCronAbc every minute.
The testCronAbc container will print the value of the environment variable AAA, 123 in this case.

cat > gen_env_file <<EOL
TASK_SCHEDULE=* * * * *
COPY_ENV_VARS=AAA,BBB
AAA=123
BBB=456
EOL

cat > gen_containerInfo.json <<EOL
{
    "Image": "ubuntu:latest",
    "Name": "testCronAbc",
    "Cmd": [
        "printenv",
        "AAA"
    ]
}
EOL

docker run --rm -d --name docker-cron                         \
  -v /var/run/docker.sock:/var/run/docker.sock                \
  -v $PWD/gen_containerInfo.json:/usr/src/containerInfo.json  \
  --env-file gen_env_file                                     \
  camilin87/docker-cron

Configuration

The cron container behavior can be tweaked with the following environment variables

# whether to display verbose logging
DOCKER_CRON_DEBUG_LOG_ENABLED=1
# the cron schedule
TASK_SCHEDULE=* * * * *
# comma-separated list of the variables
# that need to be trickled down to the spawned containers
COPY_ENV_VARS=VAR1,VAR2

Dev Resources

Development Readme

Useful Links

• Container to run Node cron jobs
• Curl and the Docker Api
• Docker Engine Api
  Docker 1.12 uses the 1.24 Api version