foo.bash

#!/usr/bin/env bash

SERVER_CNT_NAME=$1
CLIENT_CNT_NAME=$2
GFS_VOLUME_NAME=$3
COREOS_PRIVATE_IPV4=$4

GLUSTER_NODE_IPS=($(/usr/bin/etcdctl ls /services/glusterfs | xargs -I {} /usr/bin/etcdctl get {} | tr '\n' ' '))

echo "Probing gluster peers at ip addresses ${GLUSTER_NODE_IPS[*]}..."

function probePeer {
    IP=$1
    echo "Probing peer $IP ..."
    /usr/bin/docker exec $SERVER_CNT_NAME gluster peer probe $IP || {
        echo "Failed to probe peer ${ip}, error status $?"
        exit 1
    }
}

( for ip in "${GLUSTER_NODE_IPS[@]}"; do probePeer $ip; done )

[[ "$?" -eq 1 ]] && {
    echo "Cannot probe all ${GLUSTER_NODE_IPS[*]} peers which is probably networking problem !!!"
    exit 1
}

echo "Peers found, checking whether $GFS_VOLUME_NAME volume exists ..."

/usr/bin/docker exec $SERVER_CNT_NAME gluster volume info $GFS_VOLUME_NAME || {
    GLUSTER_BRICK_ADDRESSES=$(/usr/bin/etcdctl ls /services/glusterfs | xargs -I {} /usr/bin/etcdctl get {} | xargs -I {} echo "{}:/media/gfs/${GFS_VOLUME_NAME}" | tr '\n' ' ')
    echo "Creating volume $GFS_VOLUME_NAME ... using brick addresses $GLUSTER_BRICK_ADDRESSES"
    /usr/bin/docker exec $SERVER_CNT_NAME gluster volume create $GFS_VOLUME_NAME replica 2 $GLUSTER_BRICK_ADDRESSES force && {
        /usr/bin/docker exec $SERVER_CNT_NAME gluster volume start $GFS_VOLUME_NAME
    }
}

[[ "$?" -eq 0 ]] && {
    sleep 5
    echo "Mounting gfs volume ..."
    /usr/bin/docker run \
    --privileged=true \
    --name $CLIENT_CNT_NAME \
    -e GLUSTERFS_HOST=$(/usr/bin/etcdctl get /services/glusterfs/${COREOS_PRIVATE_IPV4}) \
    -e GFS_VOLUME_NAME=$GFS_VOLUME_NAME \
    -v /media/gfs \
    gwiq/glusterfs-client
}