Ignition
Ignition is an open-source, immutable infrastructure provisioning tool developed by CoreOS (now part of Red Hat) for initializing bare-metal servers, virtual machines, and cloud instances. It uses declarative configuration files in JSON format to specify disk partitioning, filesystem creation, systemd unit files, and user accounts during the first boot of a machine. It is primarily used with operating systems like Fedora CoreOS, RHEL CoreOS, and Flatcar Container Linux to automate and secure the provisioning process.
Developers should learn Ignition when working with immutable infrastructure, particularly in containerized or cloud-native environments where reproducible and secure machine provisioning is critical. It is essential for use cases like deploying Kubernetes clusters, edge computing devices, or any scenario requiring automated, first-boot configuration without manual intervention, as it ensures machines are set up consistently and reduces attack surfaces by avoiding runtime configuration changes.