Cri File System Tools Install - 

mkdir /tmp/mycontainer
crifs mycontainer-image:latest /tmp/mycontainer
ls -la /tmp/mycontainer
fusermount -u /tmp/mycontainer

This gives quick access to useful commands: mount-rootfs, inspect-layers, extract-image, snapshot-info.

sudo apt update
sudo apt install -y git curl build-essential pkg-config fuse-overlayfs

Fedora/CentOS (example):

sudo dnf install -y git curl gcc make fuse-overlayfs

git clone https://github.com/example/cri-fs-tools.git ~/cri-fs-tools
cd ~/cri-fs-tools

sudo cp bin/* /usr/local/bin/
sudo chmod +x /usr/local/bin/*

make build
sudo cp build/cri-fs-tools /usr/local/bin/

which mount-rootfs
mount-rootfs --help

inspect-layers path/to/image.tar

sudo mount-rootfs --image /var/lib/containerd/io.containerd.content.v1.content/blobs/sha256/<hash> /mnt/cri-rootfs
# when done:
sudo umount /mnt/cri-rootfs

extract-image image.tar /tmp/image-contents

sudo snapshot-info --containerd /var/lib/containerd/io.containerd.metadata.v1.<...>

Notes:

CRI-O has its own tooling for managing container filesystems.

# Install CRI-O (example for Ubuntu 22.04)
OS="xUbuntu_22.04"
VERSION="1.30"
echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/ /" | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/Release.key | sudo apt-key add -
echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/ /" | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.list
curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/Release.key | sudo apt-key add -
sudo apt-get update
sudo apt-get install -y cri-o cri-o-runc

# Set version (check latest at https://github.com/kubernetes-sigs/cri-tools/releases)
VERSION="v1.30.0"

After completing the cri file system tools install, test each tool to ensure it’s functioning correctly. cri file system tools install


If your distribution's package manager does not include cri-tools, or you need a specific version, install the binary directly.


    

  1. 

    Determine the latest version:
Check the cri-tools releases page on GitHub. As of this writing, let's assume v1.30.0 (replace this with the latest stable version matching your Kubernetes cluster version). This gives quick access to useful commands: mount-rootfs,
    

    2. 

  2. 

    Download and Install:
    

    VERSION="v1.30.0"
wget https://github.com/kubernetes-sigs/cri-tools/releases/download/$VERSION/critools-$VERSION-linux-amd64.tar.gz

    docker run -it --privileged --rm alpine:edge sh -c "apk add criu crifs; crifs --help"

    

    Note: The --privileged flag is required for filesystem and FUSE operations. sudo apt update sudo apt install -y git
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