Druid launch script improvements (#3175)

* Add status command to launch scripts

* make druid init script to pick up config directories from environment variables

make druid init script to pick up config directories from environment
variables

examples/bin/broker.sh

@@ -1,6 +1,6 @@
 #!/bin/bash -eu
 
-usage="Usage: broker.sh (start|stop)"
+usage="Usage: broker.sh (start|stop|status)"
 
 if [ $# -lt 1 ]; then
   echo $usage

examples/bin/coordinator.sh

@@ -1,6 +1,6 @@
 #!/bin/bash -eu
 
-usage="Usage: coordinator.sh (start|stop)"
+usage="Usage: coordinator.sh (start|stop|status)"
 
 if [ $# -lt 1 ]; then
   echo $usage

examples/bin/historical.sh

@@ -1,6 +1,6 @@
 #!/bin/bash -eu
 
-usage="Usage: historical.sh (start|stop)"
+usage="Usage: historical.sh (start|stop|status)"
 
 if [ $# -lt 1 ]; then
   echo $usage

examples/bin/middleManager.sh

@@ -1,6 +1,6 @@
 #!/bin/bash -eu
 
-usage="Usage: middleManager.sh (start|stop)"
+usage="Usage: middleManager.sh (start|stop|status)"
 
 if [ $# -lt 1 ]; then
   echo $usage

examples/bin/node.sh

@@ -1,9 +1,14 @@
 #!/bin/bash -eu
 
-## Initializtion script for druid nodes
-## Runs druid nodes as a daemon and pipes logs to log/ directory
+## Initialization script for druid nodes
+## Runs druid nodes as a daemon
+## Environment Variables used by this script -
+## DRUID_LIB_DIR - directory having druid jar files, default=lib
+## DRUID_CONF_DIR - directory having druid config files, default=conf/druid
+## DRUID_LOG_DIR - directory used to store druid logs, default=log
+## DRUID_PID_DIR - directory used to store pid files, default=var/druid/pids
 
-usage="Usage: node.sh nodeType (start|stop)"
+usage="Usage: node.sh nodeType (start|stop|status)"
 
 if [ $# -le 1 ]; then
   echo $usage
@@ -13,10 +18,16 @@ fi
 nodeType=$1
 shift
 
-startStop=$1
-pid=var/druid/pids/$nodeType.pid
+command=$1
 
-case $startStop in
+LIB_DIR="${DRUID_LIB_DIR:=lib}"
+CONF_DIR="${DRUID_CONF_DIR:=conf/druid}"
+LOG_DIR="${DRUID_LOG_DIR:=log}"
+PID_DIR="${DRUID_PID_DIR:=var/druid/pids}"
+
+pid=$PID_DIR/$nodeType.pid
+
+case $command in
 
   (start)
 
@@ -27,7 +38,7 @@ case $startStop in
       fi
     fi
 
-    nohup java `cat conf/druid/$nodeType/jvm.config | xargs` -cp conf/druid/_common:conf/druid/$nodeType:lib/* io.druid.cli.Main server $nodeType > log/$nodeType.log &
+    nohup java `cat $CONF_DIR/$nodeType/jvm.config | xargs` -cp $CONF_DIR/_common:$CONF_DIR/$nodeType:$LIB_DIR/* io.druid.cli.Main server $nodeType > $LOG_DIR/$nodeType.log &
     nodeType_PID=$!
     echo $nodeType_PID > $pid
     echo "Started $nodeType node ($nodeType_PID)"
@@ -49,6 +60,19 @@ case $startStop in
     fi
     ;;
 
+   (status)
+    if [ -f $pid ]; then
+      if kill -0 `cat $pid` > /dev/null 2>&1; then
+        echo RUNNING
+        exit 0
+      else
+        echo STOPPED
+      fi
+    else
+      echo STOPPED
+    fi
+    ;;
+
   (*)
     echo $usage
     exit 1

examples/bin/overlord.sh

@@ -1,6 +1,6 @@
 #!/bin/bash -eu
 
-usage="Usage: overlord.sh (start|stop)"
+usage="Usage: overlord.sh (start|stop|status)"
 
 if [ $# -lt 1 ]; then
   echo $usage