Cri File System Tools | Link

Creating a comprehensive guide that links to CRI (Container Runtime Interface) file system tools involves understanding what CRI is, its significance, and then providing an overview of the essential tools and their links.

Command-Line Tools (Example Syntax)

# Create a symlink inside a CPK
cri-tools link add source.cpk --from "data/textures/orig.tex" --to "data/textures/highres.tex"
Scenario 2: Disk space leak from dangling snapshot links
Sometimes, the parent link remains even after the child snapshot is deleted, preventing garbage collection. cri file system tools link
Using ctr to prune snapshots:
ctr -n k8s.io snapshot rm <snapshot-key>
ctr -n k8s.io snapshot gc  # Garbage collects unlinked snapshots

Manual cleanup (advanced): Check /var/lib/containerd/io.containerd.snapshotter.v1.overlayfs/metadata.db (a BoltDB file) for orphaned links. Tools like boltdb-viewer can inspect it. Creating a comprehensive guide that links to CRI
The Challenge of the Container File System
Containers are designed to be ephemeral, and their file systems are typically composed of layered read-only images topped with a writable layer. When a container is running, accessing these layers isn't always straightforward. Standard SSH access might not be available, or the container might be in a CrashLoopBackOff state, preventing the execution of standard shell commands like ls or cat. Manual cleanup (advanced):  Check  /var/lib/containerd/io
3.3 containerd’s CRI plugin filesystem helpers
Containerd implements CRI via cri plugin, which uses:

Snapshotter (default: overlayfs) – manages layer stacks.
Content store – stores unpacked image blobs.
cri-fs-helper (internal) – ensures bind mounts are resolved before sandbox creation.

ctr (containerd’s CLI) can debug snapshots:
ctr snapshot ls
ctr snapshot mount <key> /mnt/snapshot