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Merge pull request #79 from jodh-intel/add-upgrade-doc
docs: Add upgrading doc
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James O. D. Hunt
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Upgrading.md
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Upgrading.md
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* [Introduction](#introduction)
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* [Unsupported scenarios](#unsupported-scenarios)
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* [Maintenance Warning](#maintenance-warning)
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* [Upgrade from Clear Containers](#upgrade-from-clear-containers)
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* [Stop all running Clear Container instances](#stop-all-running-clear-container-instances)
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* [Configuration migration](#configuration-migration)
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* [Remove Clear Containers packages](#remove-clear-containers-packages)
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* [Fedora](#fedora)
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* [Ubuntu](#ubuntu)
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* [Disable old container manager configuration](#disable-old-container-manager-configuration)
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* [Install Kata Containers](#install-kata-containers)
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* [Create a Kata Container](#create-a-kata-container)
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* [Upgrade Kata Containers](#upgrade-kata-containers)
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* [Appendices](#appendices)
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* [Assets](#assets)
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* [Guest kernel](#guest-kernel)
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* [Image](#image)
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* [Determining asset versions](#determining-asset-versions)
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# Introduction
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This document explains how to upgrade from
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[Clear Containers](https://github.com/clearcontainers) to
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[Kata Containers](https://github.com/kata-containers) and how to upgrade an existing
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Kata Containers system to the latest version.
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# Unsupported scenarios
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Upgrading a Clear Containers system on the following distributions is **not**
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supported since the installation process for these distributions makes use of
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unpackaged components:
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- [CentOS](https://github.com/clearcontainers/runtime/blob/master/docs/centos-installation-guide.md)
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- [BCLinux](https://github.com/clearcontainers/runtime/blob/master/docs/bclinux-installation-guide.md)
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- [RHEL](https://github.com/clearcontainers/runtime/blob/master/docs/rhel-installation-guide.md)
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- [SLES](https://github.com/clearcontainers/runtime/blob/master/docs/sles-installation-guide.md)
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Additionally, upgrading
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[Clear Linux](https://github.com/clearcontainers/runtime/blob/master/docs/clearlinux-installation-guide.md)
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is not supported as Kata Containers packages do not yet exist.
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# Maintenance Warning
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The Clear Containers codebase is no longer being developed. Only new releases
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will be considered for significant bug fixes.
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The main development focus is now on Kata Containers. All Clear Containers
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users are encouraged to switch to Kata Containers.
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# Upgrade from Clear Containers
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Since Kata Containers can co-exist on the same system as Clear Containers, if
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you already have Clear Containers installed, the upgrade process is simply to
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install Kata Containers. However, since Clear Containers is
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[no longer being actively developed](#maintenance-warning),
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you are encouraged to remove Clear Containers from your systems.
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## Stop all running Clear Container instances
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Assuming a Docker\* system, to stop all currently running Clear Containers:
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```
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$ for container in $(sudo docker ps -q); do sudo docker stop $container; done
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```
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## Configuration migration
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The automatic migration of
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[Clear Containers configuration](https://github.com/clearcontainers/runtime#configuration) to
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[Kata Containers configuration](https://github.com/kata-containers/runtime#configuration) is
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not supported.
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If you have made changes to your Clear Containers configuration, you should
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review those changes and decide whether to manually apply those changes to the
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Kata Containers configuration.
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> **Note**: This step must be completed before continuing to
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> [remove the Clear Containers packages](#remove-clear-containers-packages) since doing so will
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> *delete the default Clear Containers configuration file from your system*.
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## Remove Clear Containers packages
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> **Warning**: If you have modified your
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> [Clear Containers configuration](https://github.com/clearcontainers/runtime#configuration),
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> you might want to make a safe copy of the configuration file before removing the
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> packages since doing so will *delete the default configuration file*
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### Fedora
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```
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$ sudo -E dnf remove cc-runtime\* cc-proxy\* cc-shim\* linux-container clear-containers-image qemu-lite
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$ sudo rm /etc/yum.repos.d/home:clearcontainers:clear-containers-3.repo
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```
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### Ubuntu
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```
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$ sudo apt-get purge cc-runtime\* cc-proxy\* cc-shim\* linux-container clear-containers-image qemu-lite
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$ sudo rm /etc/apt/sources.list.d/clear-containers.list
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```
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## Disable old container manager configuration
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Assuming a Docker installation, remove the docker configuration for Clear
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Containers:
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```
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$ sudo rm /etc/systemd/system/docker.service.d/clear-containers.conf
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```
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## Install Kata Containers
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Follow one of the [installation guides](https://github.com/kata-containers/documentation/tree/master/install).
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## Create a Kata Container
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```
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$ sudo docker run -ti busybox sh
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```
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# Upgrade Kata Containers
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As shown in the
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[installation instructions](https://github.com/kata-containers/documentation/blob/master/install),
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Kata Containers provide binaries for popular distributions in their native
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packaging formats. This allows Kata Containers to be upgraded using the
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standard package management tools for your distribution.
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# Appendices
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## Assets
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Kata Containers requires additional resources to create a virtual machine
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container. These resources are called
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[Kata Containers assets](https://github.com/kata-containers/documentation/blob/master/architecture.md#assets),
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which comprise a guest kernel and a root filesystem or initrd image. This
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section describes when these components are updated.
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Since the official assets are packaged, they are automatically upgraded when
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new package versions are published.
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> **Warning**: Note that if you use custom assets (by modifying the
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> [Kata Runtime configuration > file](https://github.com/kata-containers/runtime/#configuration)),
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> it is your responsibility to ensure they are updated as necessary.
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### Guest kernel
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The `kata-linux-container` package contains a Linux\* kernel based on the
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latest vanilla version of the
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[longterm kernel](https://www.kernel.org/)
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plus a small number of
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[patches](https://github.com/kata-containers/packaging/tree/master/kernel).
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The `Longterm` branch is only updated with
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[important bug fixes](https://www.kernel.org/category/releases.html)
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meaning this package is only updated when necessary.
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The guest kernel package is updated when a new longterm kernel is released
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and when any patch updates are required.
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### Image
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The `kata-containers-image` package is updated only when critical updates are
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available for the packages used to create it, such as:
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- systemd
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- [Kata Containers Agent](https://github.com/kata-containers/agent)
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### Determining asset versions
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To see which versions of the assets being used:
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```
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$ kata-runtime kata-env
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```
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