Note: The --privileged flag is required for filesystem and FUSE operations.
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# List all images stored in the Kubernetes file system layer sudo ctr -n k8s.io images list # Check content mounts and snapshots sudo ctr -n k8s.io snapshots list Use code with caution. 3. Installing nerdctl (Advanced File System & Image Tool) cri file system tools install
crictl requires a configuration file to know which container runtime socket to communicate with. Without this configuration, file system inspection commands will fail. Create or edit the configuration file at /etc/crictl.yaml : sudo nano /etc/crictl.yaml Use code with caution.
Common commands:
This comprehensive guide will explain what CRI file system tools are, why they are critical, and—most importantly—provide a step-by-step walkthrough for installing them on major Linux distributions, along with post-installation verification and usage examples.
To get the absolute latest features—especially for filesystem checkpointing—build from source. Note: The --privileged flag is required for filesystem
# Package manager sudo apt remove cri-tools # Debian/Ubuntu sudo dnf remove cri-tools # RHEL/Fedora
Before installing the tools, it is crucial to understand which tool fits your specific runtime environment. If you share with third parties, their policies apply
The is the backbone of modern Kubernetes clusters, acting as the bridge between the orchestration layer and the actual containers. When a cluster breaks or requires manual tuning, CRI file system tools —specifically crictl and ctr —become the essential "scalpels" for developers and sysadmins. Installing and mastering these tools is not just a technical task; it is a fundamental requirement for maintaining healthy, containerized environments. The Power of crictl
: You can install the cri-tools package directly using apt .