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Introduction

This document outlines the options for upgrading from a Kata Containers 1.x release to a Kata Containers 2.x release.

Maintenance warning

Kata Containers 2.x is the new focus for the Kata Containers development community.

Although Kata Containers 1.x releases will continue to be published for a period of time, once a stable release for Kata Containers 2.x is published, Kata Containers 1.x stable users should consider switching to the Kata 2.x release.

See the stable branch strategy documentation for further details.

Determine current version

To display the current Kata Containers version, run one of the following:

$ kata-runtime --version
$ containerd-shim-kata-v2 --version

Determine latest version

Kata Containers 2.x releases are published on the Kata Containers GitHub releases page.

Alternatively, if you are using Kata Containers version 1.12.0 or newer, you can check for newer releases using the command line:

$ kata-runtime check --check-version-only

There are various other related options. Run kata-runtime check --help for further details.

Configuration changes

The Kata Containers 2.x configuration file is compatible with the Kata Containers 1.x configuration file.

However, if you have created a local configuration file (/etc/kata-containers/configuration.toml), this will mask the newer Kata Containers 2.x configuration file.

Since Kata Containers 2.x introduces a number of new options and changes some default values, we recommend that you disable the local configuration file (by moving or renaming it) until you have reviewed the changes to the official configuration file and applied them to your local file if required.

Upgrade Kata Containers

Upgrade native distribution packaged version

As shown in the installation instructions, Kata Containers provide binaries for popular distributions in their native packaging formats. This allows Kata Containers to be upgraded using the standard package management tools for your distribution.

Note:

Users should prefer the distribution packaged version of Kata Containers unless they understand the implications of a manual installation.

Static installation

Note:

Unless you are an advanced user, if you are using a static installation of Kata Containers, we recommend you remove it and install a native distribution packaged version instead.

Determine if you are using a static installation

If the following command displays the output "static", you are using a static version of Kata Containers:

$ ls /opt/kata/bin/kata-runtime &>/dev/null && echo static

Remove a static installation

Static installations are installed in /opt/kata/, so to uninstall simply remove this directory.

Upgrade a static installation

If you understand the implications of using a static installation, to upgrade first remove the existing static installation, then install the latest release.

See the manual installation documentation for details on how to automatically install and configuration a static release with containerd.

Custom assets

Note:

This section only applies to advanced users who have built their own guest kernel or image.

If you are using custom guest assets, you must upgrade them to work with Kata Containers 2.x since Kata Containers 1.x assets will not work.

See the following for further details:

The official assets are packaged meaning they are automatically included in new releases.