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# VyOS as Docker container
VyOS can be run as a Docker container on a Linux host with a compatible kernel.
## Building Docker image
To build a Docker image you need to have the whole `vyos-build` repository, not only a folder with Dockerfile, because some files from this repository are required for building.
Docker image with VyOS can be built on Linux host with the next command:
```
docker build --compress -f Dockerfile -t vyos:version-`date -u +%Y%m%d%H%M%S` --build-arg BUILD_DATE="`date -u --rfc-3339=seconds`" --build-arg VYOS_VERSION=version --build-arg DEBIAN_VERSION=debian --progress plain ..
```
Or, if you want to rebuild completely from the scratch (without cache):
```
docker build --no-cache --pull --compress -f Dockerfile -t vyos:version-`date -u +%Y%m%d%H%M%S` --build-arg BUILD_DATE="`date -u --rfc-3339=seconds`" --build-arg VYOS_VERSION=version --build-arg DEBIAN_VERSION=debian --progress plain ..
```
> **NOTE:** You must use proper version value for `DEBIAN_VERSION` variable. It can be only `jessie` (for VyOS 1.2) or `buster` (for VyOS 1.3).
## Running Docker image
Docker container with VyOS can be running with the next command:
```
docker run -v /lib/modules:/lib/modules --privileged --name vyos_inside_docker -d vyos:version
```
You need to use the `--privileged` flag because the system actively interacts with a host kernel to perform routing operations and tune networking options.
**Experimantal:** You can limit access to some system resources with:
```
docker run --tmpfs /tmp --tmpfs /run --tmpfs /run/lock -v /sys/fs/cgroup:/sys/fs/cgroup:ro -v /lib/modules:/lib/modules --privileged --name vyos_inside_docker -d vyos:version
```
## Logging into a VyOS container
To open VyOS CLI, you can use SSH connection to the Docker container or run on host:
```
docker exec -it vyos_inside_docker su vyos
```
## Troubleshooting
If in VyOS appears IPv6-related errors, for example, it cannot assign an IPv6 for an interface, it is necessary to enable IPv6 support in Docker. This can be done, by editing `/etc/docker/daemon.json`:
```
{
"ipv6": true,
"fixed-cidr-v6": "fe80::/64"
}
```
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