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CRI-O Container Engine Guide

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Overview: CRI-O is an open source container engine replacing Docker for Kubernetes
Provides stable, secure, and performant platform for OCI-compatible runtimes
Developed alongside Kubernetes releases and follows OCI standards
Installation: Can be installed during OpenShift Container Platform installation
Supports both CRI-O-only and Docker-enabled nodes
Requires rpm-based installation, not container-based
Cannot be used as standalone container engine
Configuration: Most settings stored in /etc/crio/crio.conf file
Uses OverlayFS2 as default storage driver
Supports networking through CNI plugins
Configuration changes should only be made through OpenShift
Management: Direct command-line access available through crictl
Supports runc for container image management
Podman provides alternative container management without engine
Can be debugged using systemd service logging
Troubleshooting: Health checked through systemctl commands
Logs can be inspected using journalctl
Crictl provides detailed container and pod information
Runc can be used to check container status even without CRI-O