Shell script to start a docker container and add it to hipache

hipache-docker

#!/bin/bash

# The MIT License (MIT)
# 
# Copyright (c) <year> <copyright holders>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

# place the following variables in ~/.hipachedockerrc:
# DOMAIN="example.com"       # your domain, used to create subdomains
# REDISPORT="12345"          # port to the hipache redis database
# SERVERIP="127.0.1.1"       # public IP of the server

# run hipache:
# docker run -d -p 80:80 stackbrew/hipache

# start a container:
# ./hipache-docker -p 9000 crosbymichael/sentry

# remove a container:
# ./hipache-docker -d red_ant

set -e
set -u

usage() { echo "Usage: $0 [-d] [-s subdomain] [-p port] container [args]" 1>&2; exit 1; }

rndstr() { cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 12 | head -n 1; }

urlexists() {
	[ `redis-cli -p "$REDISPORT" exists "$1"` -ne 0 ]
}

addproxy() {
	redis-cli -p "$REDISPORT" rpush "frontend:$1" "$2"
	redis-cli -p "$REDISPORT" rpush "frontend:$1" "$3"
	redis-cli -p "$REDISPORT" set "container:$4" "frontend:$1"
}

getid() {
	INSPECT=`docker inspect $1`
	if [ "$?" -ne 0 ]; then
		exit 4
	fi
	echo $INSPECT | python -c "import json, sys; print json.load(sys.stdin)[0]['ID']"
}

getname() {
	INSPECT=`docker inspect $1`
	if [ "$?" -ne 0 ]; then
		exit 4
	fi
	echo $INSPECT | python -c "import json, sys; print json.load(sys.stdin)[0]['Name']" | grep -Po '[\w_]*'
}

delproxy() {
	KEY=`redis-cli -p "$REDISPORT" get "container:$1"`
	redis-cli -p "$REDISPORT" del "$KEY"
	redis-cli -p "$REDISPORT" del "container:$1"
}

MODE="create"
SUBDOMAIN=`rndstr`
PORT="80"
while getopts ':ds:p:' o; do
	case "${o}" in
		d)
			MODE="delete"
			;;
		s)
			SUBDOMAIN=${OPTARG}
			;;
		p)
			PORT=${OPTARG}
			;;
		*)
			usage
			;;
	esac
done

shift $((OPTIND-1))

if [ -z ${1:-} ]; then
	usage
fi

CONTAINER=$1
shift
CONTAINERARGS="$@"

source ~/.hipachedockerrc

DOMAIN=${DOMAIN:-"localhost"}
REDISPORT=${REDISPORT:-"6379"}
SERVERIP=${SERVERIP:-"127.0.0.1"}

URL="http://$SUBDOMAIN.$DOMAIN"

case "$MODE" in
	delete)
		ID=`getid "$CONTAINER"`
		delproxy "$ID"     > /dev/null
		docker stop "$ID"  > /dev/null
		docker rm "$ID"    > /dev/null
		;;
	create)
		if urlexists "$URL"; then
			echo "$URL already exists, choose another subdomain"
			exit 3
		fi
		ID=`docker run -d -p "$PORT" "$CONTAINER" $CONTAINERARGS`
		ID=`getid "$ID"`
		NAME=`getname "$ID"`
		DOCKERIP=`docker port $ID $PORT`
		DOCKERPORT=`echo $DOCKERIP | cut -d':' -f2`
		LOCALURL="http://$SERVERIP:$DOCKERPORT"
		addproxy "$SUBDOMAIN.$DOMAIN" "$SUBDOMAIN" "$LOCALURL" "$ID" > /dev/null
		echo "$NAME" >&2
		echo $URL
		;;
esac