Ofelia is a modern and low footprint job scheduler for docker environments, built on Go. Ofelia aims to be a replacement for the old fashioned cron.
It has been a long time since cron was released, actually more than 28 years. The world has changed a lot and especially since the Docker revolution. Vixie's cron works great but it's not extensible and it's hard to debug when something goes wrong.
Many solutions are available: ready to go containerized crons, wrappers for your commands, etc. but in the end simple tasks become complex.
The main feature of Ofelia is the ability to execute commands directly on Docker containers. Using Docker's API Ofelia emulates the behavior of exec, be in able to run a command inside of a running container. Also you can run the command in a new container destroying it at the end of the execution.
It uses a INI-style config file and the scheduling format is exactly the same from the original
cron, you can configure three different kind of jobs:
job-exec: this job is executed inside of a running container.
job-run: runs a command inside of a new container, using a specific image.
job-local: runs the command inside of the host running ofelia.
job-service-run: runs the command inside a new "run-once" service, for running inside a swarm
[job-exec "job-executed-on-running-container"] schedule = @hourly container = my-container command = touch /tmp/example [job-run "job-executed-on-new-container"] schedule = @hourly image = ubuntu:latest command = touch /tmp/example [job-local "job-executed-on-current-host"] schedule = @hourly command = touch /tmp/example [job-service-run "service-executed-on-new-container"] schedule = 0,20,40 * * * * image = ubuntu network = swarm_network command = touch /tmp/example
Ofelia comes with three different logging drivers that can be configured in the
saveto save structured execution reports to a directory
slackto send messages via a slack webhook
smtp-host- address of the SMTP server.
smtp-port- port number of the SMTP server.
smtp-user- user name used to connect to the SMTP server.
smtp-password- password used to connect to the SMTP server.
email-to- mail address of the receiver of the mail.
email-from- mail address of the sender of the mail.
mail-only-on-error- only send a mail if the execution was not successful.
save-folder- directory in which the reports shall be written.
save-only-on-error- only save a report if the execution was not successful.
slack-webhook- URL of the slack webhook.
slack-only-on-error- only send a slack message if the execution was not successful.
Ofelia can prevent that a job is run twice in parallel (e.g. if the first execution didn't complete before a second execution was scheduled. If a job has the option
no-overlap set, it will not be run concurrently.
The easiest way to deploy ofelia is using Docker.
docker run -it -v /etc/ofelia:/etc/ofelia mcuadros/ofelia:latest
Don't forget to place your
config.ini at your host machine.
If don't want to run ofelia using our Docker image you can download a binary from releases page.