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Install Stargz Snapshotter and Stargz Store

What's Stargz Snapshotter and Stargz Store?

Stargz Snapshotter is a plugin for containerd, which enables it to perform lazy pulling of eStargz. This is an implementation of remote snapshotter plugin and provides remotely-mounted eStargz layers to containerd. Communication between containerd and Stargz Snapshotter is done with gRPC over unix socket. For more details about Stargz Snapshotter and the relationship with containerd, please refer to the doc.

If you are using CRI-O/Podman, you can't use Stargz Snapshotter for enabling lazy pulling of eStargz. Instead, use Stargz Store plugin. This is an implementation of additional layer store plugin of CRI-O/Podman. Stargz Store provides remotely-mounted eStargz layers to CRI-O/Podman.

Stargz Store exposes mounted filesystem structured like the following. CRI-O/Podman access to this filesystem to acquire eStargz layers.

<mountpoint>/base64(imageref)/<layerdigest>/
- diff  : exposes the extracted eStargz layer
- info  : contains JSON-formatted metadata of this layer
- use   : files to notify the use of this layer (used for GC)

Install Stargz Snapshotter for containerd with Systemd

To enable lazy pulling of eStargz on containerd, you need to install Stargz Snapshotter plugin. This section shows the step to install Stargz Snapshotter with systemd. We assume that you are using containerd (> v1.4.2) as a CRI runtime.

  • Download release tarball from the release page.

  • Add the following configuration to containerd's configuration file (typically: /etc/containerd/config.toml). Please see also an example configuration file.

    version = 2

# Enable stargz snapshotter for CRI
[plugins."io.containerd.grpc.v1.cri".containerd]
  snapshotter = "stargz"
  disable_snapshot_annotations = false

# Plug stargz snapshotter into containerd
[proxy_plugins]
  [proxy_plugins.stargz]
    type = "snapshot"
    address = "/run/containerd-stargz-grpc/containerd-stargz-grpc.sock"

  • Install fuse

    centos
    # centos 7
yum install fuse
# centos 8
dnf install fuse

modprobe fuse
    ubuntu
    apt-get install fuse
modprobe fuse

  • Start stargz-snapshotter and restart containerd

    tar -C /usr/local/bin -xvf stargz-snapshotter-${version}-linux-${arch}.tar.gz containerd-stargz-grpc ctr-remote
wget -O /etc/systemd/system/stargz-snapshotter.service https://raw.githubusercontent.com/containerd/stargz-snapshotter/main/script/config/etc/systemd/system/stargz-snapshotter.service
systemctl enable --now stargz-snapshotter
systemctl restart containerd

Install Stargz Store for CRI-O/Podman with Systemd

To enable lazy pulling of eStargz on CRI-O/Podman, you need to install Stargz Store plugin. This section shows the step to install Stargz Store with systemd. We assume that you are using CRI-O newer than cri-o/cri-o#4850 or Podman newer than containers/podman#10214 .

  • Download release tarball from the release page.

  • Add the following configuration to the storage configuration file of CRI-O/Podman (typically: /etc/containers/storage.conf). Please see also an example configuration file.

    [storage]
driver = "overlay"
graphroot = "/var/lib/containers/storage"
runroot = "/run/containers/storage"

[storage.options]
additionallayerstores = ["/var/lib/stargz-store/store:ref"]

  • Install fuse

    centos
    # centos 7
yum install fuse
# centos 8
dnf install fuse

modprobe fuse
    ubuntu
    apt-get install fuse
modprobe fuse

  • Start stargz-store (CRI-O also needs to be restarted if you are using)

    tar -C /usr/local/bin -xvf stargz-snapshotter-${version}-linux-${arch}.tar.gz stargz-store
wget -O /etc/systemd/system/stargz-store.service https://raw.githubusercontent.com/containerd/stargz-snapshotter/main/script/config-cri-o/etc/systemd/system/stargz-store.service
systemctl enable --now stargz-store
systemctl restart cri-o # if you are using CRI-O