/etc/init.d/garb requires nc and produces an nc error if no cluster nodes are up

I installed the galera 25.3.5 RPM from the http://yum.mariadb.org/10.0/centos6-amd64 repo and after configuring /etc/default/garb, I then ran "/etc/init.d/garb start" without any of the configured cluster nodes being up.

First issue is that line 122 reads:

nc -z $HOST $PORT >/dev/null && break

and yet a standard CentOS 6.5 server install doesn't include the "nc" command. I had to "yum install nc" to fix this, but the RPM should obviously have nc as a dependency.

Second problem is that the code in that loop (lines 118-123) will test each node and then set $ADDRESS = 0 (and hence $HOST =0 and $PORT = 0) if none of the ${GALERA_NODES} nodes are running. Unfortunately, this produces a port error message from CentOS 6.5's nc command because "nc -z 0 0" is, of course, not correct.

The fix for this is probably to only run the code if $ADDRESS != 0 e.g.:

for ADDRESS in ${GALERA_NODES} 0; do
if [ "$ADDRESS" != "0"]
then
HOST=$(echo $ADDRESS | cut -d \: -f 1 )
PORT=$(echo $ADDRESS | cut -d \: -f 2 )
PORT=${PORT:-$GALERA_PORT}
nc -z $HOST $PORT >/dev/null && break
fi
done