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#!/bin/bash
need_restart=
if ! type -p docker; then
echo "Installing docker..."
curl -sSL https://get.docker.io | sh
fi
docker_version=17
if ! [[ "$(docker --version)" == "Docker version $docker_version"* ]]; then
version="$(apt-cache madison docker-ce | cut -f 2 -d \| | grep "$docker_version" | head -n 1 | xargs echo)"
## DOWNGRADE to 17.xx because 18.xx do not support registry v1
apt-get install -y --force-yes docker-ce="$version"
need_restart=true
fi
if [ "$need_restart" ]; then
systemctl daemon-reload &&
service docker restart
fi