Issue 475: use socat instead of nc

Author: amuraru

docker/Dockerfile

@@ -23,4 +23,4 @@ RUN chmod +x /usr/local/bin/*
 COPY --from=0 /zu/build/libs/zu.jar /opt/libs/
 
 RUN apt-get -q update && \
-    apt-get install --no-install-recommends -y curl dnsutils procps
+    apt-get install --no-install-recommends -y curl dnsutils procps socat

docker/bin/zookeeperLive.sh

@@ -13,7 +13,7 @@ set -ex
 
 source /conf/env.sh
 
-OK=$(echo ruok | nc 127.0.0.1 $CLIENT_PORT)
+OK=$(echo ruok | socat stdio tcp:localhost:$CLIENT_PORT)
 
 # Check to see if zookeeper service answers
 if [[ "$OK" == "imok" ]]; then

docker/bin/zookeeperMetrics.sh

@@ -13,4 +13,4 @@ set -ex
 
 source /conf/env.sh
 
-echo mntr | nc localhost $CLIENT_PORT >& 1
+echo mntr | socat stdio tcp:localhost:$CLIENT_PORT >& 1

docker/bin/zookeeperReady.sh

@@ -28,7 +28,7 @@ OFFSET=${OFFSET:-1}
 CLIENT_HOST=${SEED_NODE:-$CLIENT_HOST}
 
 
-OK=$(echo ruok | nc 127.0.0.1 $CLIENT_PORT)
+OK=$(echo ruok | socat stdio tcp:localhost:$CLIENT_PORT)
 
 # Check to see if zookeeper service answers
 if [[ "$OK" == "imok" ]]; then

docker/bin/zookeeperTeardown.sh

@@ -28,7 +28,7 @@ OFFSET=${OFFSET:-1}
 # Wait for client connections to drain. Kubernetes will wait until the confiugred
 # "terminationGracePeriodSeconds" before focibly killing the container
 for (( i = 0; i < 6; i++ )); do
-  CONN_COUNT=`echo cons | nc localhost 2181 | grep -v "^$" |grep -v "/127.0.0.1:" | wc -l`
+  CONN_COUNT=`echo cons | socat stdio tcp:localhost:$CLIENT_PORT | grep -v "^$" |grep -v "/127.0.0.1:" | wc -l`
   if [[ "$CONN_COUNT" -gt 0 ]]; then
     echo "$CONN_COUNT non-local connections still connected."
     sleep 5