Create and configure GlusterFS in Docker.

gluster_docker

#!/bin/sh

GLUSTER_IMAGE=gluster/gluster-centos

gluster_ip_addr() {
	local name=$1
	docker inspect $1  | sed -n 's/.*"IPAddress":[[:blank:]]\+"\([^"]\+\)".*/\1/p' | sort -u
}

gluster_status() {
	local nodes=$1
	for i in `seq 1 $nodes`; do
		echo "== gluster$i (`gluster_ip_addr gluster$i`) status =="
		docker exec -ti gluster$i gluster peer status
		echo
	done
}

gluster_probe() {
	local nodes=$1
	for i in `seq 2 $nodes`; do
		docker exec -ti gluster1 gluster peer probe `gluster_ip_addr gluster$i`
	done
}

gluster_vol_do() {
	docker exec -ti gluster1 gluster volume $*
}

gluster_run() {
	local nodes=$1
	local etc=/etc/glusterfs
	local var=/var/lib/glusterd
	local log=/var/log/glusterfs
	local cgroup=/sys/fs/cgroup
	local srv=/srv/glusterfs

	for i in `seq 1 $nodes`; do
		docker run -d --privileged=true --name gluster$i --hostname=gluster$i \
			-v $etc$i:$etc:z \
			-v $var$i:$var:z \
			-v $log$i:$log:z \
			-v $srv$i:$srv:z \
			-v $cgroup:$cgroup:ro \
			-v /dev/:/dev \
			$GLUSTER_IMAGE
	done
}

gluster_do() {
	local op=$1
	local nodes=$2

	local etc=/etc/glusterfs
	local var=/var/lib/glusterd
	local log=/var/log/glusterfs
	local srv=/srv/glusterfs

	for i in `seq 1 $nodes`; do
		docker $op gluster$i
		[ "$op" = "rm" ] && rm -rf $etc$i $var$i $log$i $srv$i
	done
}

gluster_ssh_key() {
	local nodes=$1
	local pub_key=$2
	for i in `seq 1 $nodes`; do
		docker exec gluster$i mkdir -p /root/.ssh
		docker cp $pub_key gluster$i:/root/.ssh/authorized_keys
		docker exec gluster$i chmod -R og-rwx /root/.ssh
	done
}

if [ $# -lt 1 ]; then
	echo "gluster_docker run|start|stop|rm|probe|status|vol|pubkey [<options>]" >&2
	exit 1
fi

op=$1
shift

if [ "$op" = "vol" ]; then
	if [ $# -lt 2 ]; then
		echo "gluster_docker vol create|start|stop|info|status|delete|heal <volume> [<options>]" >&2
		exit 1
	fi

	vol_op=$1
	vol=$2
	shift 2

	case "$vol_op" in
	create|start|stop|info|status|delete|heal)
		[ "$vol_op" = "delete" ] && gluster_vol_do stop $vol
		if gluster_vol_do $vol_op $vol $* && [ "$vol_op" = "create" ]; then
			gluster_vol_do start $vol
		fi
		;;
	*)
		echo "Unknown vol operation: $vol_op" >&2
		exit 1
		;;
	esac
else
	if [ $# -lt 1 ]; then
		echo "gluster_docker $op <nodes>" >&2
		exit 1
	fi

	nodes=$1
	if [ $nodes -lt 2 ]; then
		echo "The number of nodes must be at least 2." >&2
		exit 1
	fi

	case "$op" in
	run)
		gluster_run $nodes
		gluster_probe $nodes
		;;
	status)
		gluster_status $nodes
		;;
	probe)
		gluster_probe $nodes
		;;
	start|stop|rm)
		[ "$op" = "rm" ] && gluster_do stop $nodes
		gluster_do $op $nodes
		;;
	pubkey)
		if [ $# -lt 2 ]; then
			echo "gluster_docker pubkey <nodes> <public key file>" >&2
			exit 1
		fi
		pub_key=$2

		gluster_ssh_key $nodes $pub_key
		;;
	*)
		echo "Unknown operation: $op" >&2
		exit 1
		;;
	esac
fi