How you solved "Running cron jobs" ?

There are 3 ways.

Way 1 - Write an entrypoint script.

1. invoke cron.
2. Command to run your scripts.

Pros:

• Crons goes together with your docker image = Less headache,

Cons:

• Not inline with Docker concept of "one duty per one docker instance".

Way 2 - Run cron as part of the host

Cron job will be a docker run command.

Pros:

• Goes inline with Docker concept of "one duty per one docker instance".

Cons:

• Take care of setting up docker command on host.

Way 3 - Use schedule jobs (in Kubernetes)

Pros

• Goes inline with docker concepts
• Kubernetes script takes care in all your deployments.

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I am now following Way 2 - because, I want to align with Docker concepts. Also, since I am planning to move to Kubernetes (or Docker Swarm), this strategy will help me in migration. I am not using Kubernetes in production, because of company deadlines and the learning curve there.

Ideally, I feel that schedule jobs should be used to solve Crons.

In Schedule jobs, a docker instance is created for the job and removed once the task is done.