unstable cluster fix - and future clusters via the shell script

Author: chayim

docker/base/Dockerfile.cluster

@@ -6,4 +6,6 @@ RUN chmod +x /create_cluster.sh
 
 EXPOSE 16379 16380 16381 16382 16383 16384
 
-CMD /create_cluster.sh  16379  16384
+ENV START_PORT=16379
+ENV END_PORT=16384
+CMD /create_cluster.sh

docker/base/Dockerfile.unstable_cluster

@@ -6,4 +6,6 @@ RUN chmod +x /create_cluster.sh
 
 EXPOSE 6372 6373 6374 6375 6376 6377
 
-CMD /create_cluster.sh  6372 6377
+ENV START_PORT=6372
+ENV END_PORT=6377
+CMD ["/create_cluster.sh"]

docker/base/create_cluster.sh

@@ -1,9 +1,21 @@
 #! /bin/bash
+
 mkdir -p /nodes
 touch /nodes/nodemap
-START_NODE=$1
-END_NODE=$2
-for PORT in `seq ${START_NODE} ${END_NODE}`; do
+if [ -z ${START_PORT}]; then
+    START_PORT=16379
+fi
+if [ -z ${END_PORT}]; then
+    END_PORT=16384
+fi
+if [ ! -z "$3" ]; then
+    START_PORT=$2
+    START_PORT=$3
+fi
+echo "STARTING: ${START_PORT}"
+echo "ENDING: ${END_PORT}"
+
+for PORT in `seq ${START_PORT} ${END_PORT}`; do
   mkdir -p /nodes/$PORT
   if [[ -e /redis.conf ]]; then
     cp /redis.conf /nodes/$PORT/redis.conf
@@ -17,12 +29,14 @@ daemonize yes
 logfile /redis.log
 dir /nodes/$PORT
 EOF
+
+  set -x
   redis-server /nodes/$PORT/redis.conf
   if [ $? -ne 0 ]; then
     echo "Redis failed to start, exiting."
-    exit 3
+    continue
   fi
   echo 127.0.0.1:$PORT >> /nodes/nodemap
 done
-echo yes | redis-cli --cluster create $(seq -f 127.0.0.1:%g ${START_NODE} ${END_NODE}) --cluster-replicas 1
+echo yes | redis-cli --cluster create $(seq -f 127.0.0.1:%g ${START_PORT} ${END_PORT}) --cluster-replicas 1
 tail -f /redis.log