Automatic rancher upgrade

upgrade-rancher.sh

#!/bin/bash
set -e

read -p 'New Version: ' new_version
old_container_name="$(docker ps --filter "name=rancher-server*" --format "{{.Names}}")"
old_version="$(expr $old_container_name : 'rancher-server-\(.*\)-no-cacerts')"
timestamp="$(/bin/date "+%Y-%m-%d--%H-%M-%S")"
echo "Upgrading rancher server..."
echo "$old_version -> $new_version"

docker pull rancher/rancher:v$new_version
docker stop $old_container_name
docker create --volumes-from $old_container_name --name rancher-data-$old_version rancher/rancher:v$old_version
docker run --volumes-from rancher-data-$old_version -v $PWD:/backup alpine tar zcvf /backup/rancher-data-backup-$old_version-$timestamp.tar.gz /var/lib/rancher
docker run \
    -d \
    --volumes-from rancher-data-$old_version \
    --privileged \
    --ulimit nofile=90000:90000 \
    --restart=unless-stopped \
    --name=rancher-server-$new_version-no-cacerts \
    -p 80:80 \
    -p 443:443 \
    -e VIRTUAL_HOST=rancher.hevelop.com \
    rancher/rancher:v$new_version \
    --no-cacerts

echo "Rancher server upgraded!!!"