Install docker on arm64 synology

get-docker.sh

#!/bin/bash
set -e

ARCH=aarch64
DOCKER_VERSION=20.10.0
DOCKER_DIR=/volume1/@docker

echo "Downloading docker $DOCKER_VERSION-$ARCH"
curl "https://download.docker.com/linux/static/stable/$ARCH/docker-$DOCKER_VERSION.tgz" | tar -xz -C /usr/local/bin --strip-components=1

echo "Creating docker working directory $DOCKER_DIR"
mkdir -p "$DOCKER_DIR"

echo "Creating docker.json config file"
mkdir -p /usr/local/etc/docker
cat <<EOT > /usr/local/etc/docker/docker.json
{
  "storage-driver": "vfs",
  "iptables": false,
  "bridge": "none",
  "data-root": "$DOCKER_DIR"
}
EOT

echo "Creating docker startup script"
cat <<'EOT' > /usr/local/etc/rc.d/docker.sh
#!/bin/sh
# Start docker daemon

NAME=dockerd
PIDFILE=/var/run/$NAME.pid
DAEMON_ARGS="--config-file=/usr/local/etc/docker/docker.json --pidfile=$PIDFILE"

case "$1" in
    start)
        echo "Starting docker daemon"
        /usr/local/bin/dockerd $DAEMON_ARGS &
        ;;
    stop)
        echo "Stopping docker daemon"
        kill $(cat $PIDFILE)
        ;;
    *)
        echo "Usage: "$1" {start|stop}"
        exit 1
esac
exit 0
EOT

chmod 755 /usr/local/etc/rc.d/docker.sh

echo "Creating docker group"
synogroup --add docker root

echo "Installing docker compose"
curl -L --fail https://gist.githubusercontent.com/ta264/af20c367aafa63795c3104d4b0c8b148/raw/4f6d257c026596cfce1c9052d9ac426a50e9f205/run.sh -o /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose

echo "Starting docker"
/usr/local/etc/rc.d/docker.sh start

echo "Done.  Please add your user to the docker group in the Synology GUI and reboot your NAS."

Thank you. Could you provide the use method

Hi,
first of all thanks for this super-handy script!!
I successfully installed docker on my DS418 NAS using this gist

If you are interested I have made some improvements in my fork:
https://gist.github.com/DaveMDS/c35d77e51e0186a4fe2e577f51a5b09a

The main change I have made is to install compose in a more simple and modern way (installed as a CLI plugin),
also made a small change to the group creation command to not fail if the group already exists. And updated docker version to latest available.

You can see the diff at:
https://gist.github.com/DaveMDS/c35d77e51e0186a4fe2e577f51a5b09a/revisions

Thanks again for your work!