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Editing systemd unit files to customize Docker for Kata may generate conflicts with what's specified in /etc/sysconfig/docker, so use that file directly. Also, libcgroup1 dependency is wrong for newer distros, and should be pulled automatically for older ones. Signed-off-by: Marco Vedovati <mvedovati@suse.com>
69 lines
2.5 KiB
Markdown
69 lines
2.5 KiB
Markdown
# Install Docker for Kata Containers on openSUSE
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> **Note:**
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>
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> - This guide assumes you have
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> [already installed the Kata Containers packages](../opensuse-installation-guide.md).
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1. Install the latest version of Docker with the following commands:
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> **Notes:**
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>
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> - This step is only required if Docker is not installed on the system.
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> - Docker version 18.09 [removed devicemapper support](https://github.com/kata-containers/documentation/issues/373).
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> If you wish to use a block based backend, see the options listed on https://github.com/kata-containers/documentation/issues/407.
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```bash
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$ sudo zypper -n install docker
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```
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For more information on installing Docker please refer to the
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[Docker Guide](https://software.opensuse.org/package/docker).
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2. Configure the Docker daemon to use Kata Containers by default, with one of the following methods:
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1. Specify the runtime options in `/etc/sysconfig/docker`:
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```bash
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$ DOCKER_SYSCONFIG=/etc/sysconfig/docker
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# Add kata-runtime to the list of available runtimes, if not already listed
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$ grep -qE "^ *DOCKER_OPTS=.+--add-runtime[= ] *kata-runtime" $DOCKER_SYSCONFIG || sudo -E sed -i -E "s|^( *DOCKER_OPTS=.+)\" *$|\1 --add-runtime kata-runtime=/usr/bin/kata-runtime\"|g" $DOCKER_SYSCONFIG
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# If a current default runtime is specified, overwrite it with kata-runtime
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$ sudo -E sed -i -E "s|^( *DOCKER_OPTS=.+--default-runtime[= ] *)[^ \"]+(.*\"$)|\1kata-runtime\2|g" $DOCKER_SYSCONFIG
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# Add kata-runtime as default runtime, if no default runtime is specified
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$ grep -qE "^ *DOCKER_OPTS=.+--default-runtime" $DOCKER_SYSCONFIG || sudo -E sed -i -E "s|^( *DOCKER_OPTS=.+)(\"$)|\1 --default-runtime=kata-runtime\2|g" $DOCKER_SYSCONFIG
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```
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2. Docker `daemon.json`
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Add the following definitions to `/etc/docker/daemon.json`:
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```json
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{
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"default-runtime": "kata-runtime",
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"runtimes": {
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"kata-runtime": {
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"path": "/usr/bin/kata-runtime"
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}
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}
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}
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```
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3. Restart the Docker systemd service with the following commands:
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```bash
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$ sudo systemctl daemon-reload
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$ sudo systemctl restart docker
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```
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4. Run Kata Containers
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You are now ready to run Kata Containers:
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```bash
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$ sudo docker run busybox uname -a
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```
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The previous command shows details of the kernel version running inside the
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container, which is different to the host kernel version.
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