Airlock is a minimal update/reboot manager for clusters of Linux nodes. It is meant to be simple to run in a container.
Fleet-wide updates and reboots are coordinated via semaphore locking, with configurable groups and simultaneous reboot slots.
Configuration is done through a single TOML file. The service is stateless, and etcd3 is used to store the semaphore and to guarantee its consistency.
go get -u -v github.com/coreos/airlock && airlock serve --help
A TOML configuration sample (with comments) is available under examples.
An automatically built x86_64 container image is available on quay.io and can be run as:
docker run -p 3333:3333/tcp -v "$PWD/dist/examples/config.toml:/etc/airlock/config.toml" quay.io/coreos/airlock:main airlock serve -vv