deb: add systemd service config for upcoming Jessie

This change adds a systemd service configuration file, and adds systemd logic
to installation and de-installation scripts. The upcoming Debian 8 "Jessie"
release will use systemd.

fixes #8943

Signed-off-by: Thilo Fromm <github@thilo-fromm.de>

pom.xml

@@ -975,6 +975,11 @@
                                         <group>root</group>
                                     </mapper>
                                 </data>
+                                <data>
+                                    <src>${project.basedir}/src/deb/systemd/elasticsearch.service</src>
+                                    <dst>/usr/lib/systemd/system/elasticsearch.service</dst>
+                                    <type>file</type>
+                                </data>
                                 <data>
                                     <src>${project.basedir}/config</src>
                                     <type>directory</type>

src/deb/control/conffiles

@@ -2,3 +2,4 @@
 /etc/default/elasticsearch
 /etc/elasticsearch/logging.yml
 /etc/elasticsearch/elasticsearch.yml
+/usr/lib/systemd/system/elasticsearch.service

src/deb/control/postinst

@@ -4,7 +4,10 @@ set -e
 [ -f /etc/default/elasticsearch ] && . /etc/default/elasticsearch
 
 startElasticsearch() {
-	if [ -x "/etc/init.d/elasticsearch" ]; then
+    if [ -x /bin/systemctl ] ; then
+        /bin/systemctl daemon-reload
+        /bin/systemctl start elasticsearch.service
+	elif [ -x "/etc/init.d/elasticsearch" ]; then
 		if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
 			invoke-rc.d elasticsearch start || true
 		else
@@ -42,10 +45,19 @@ case "$1" in
 		startElasticsearch
 	# this is a fresh installation
 	elif [ -z $2 ] ; then
-        echo "### NOT starting elasticsearch by default on bootup, please execute"
-        echo " sudo update-rc.d elasticsearch defaults 95 10"
-        echo "### In order to start elasticsearch, execute"
-        echo " sudo /etc/init.d/elasticsearch start"
+        if [ -x /bin/systemctl ] ; then
+            echo "### NOT starting on installation, please execute the following statements to configure elasticsearch to start automatically using systemd"
+            echo " sudo /bin/systemctl daemon-reload"
+            echo " sudo /bin/systemctl enable elasticsearch.service"
+            echo "### You can start elasticsearch by executing"
+            echo " sudo /bin/systemctl start elasticsearch.service"
+
+        elif [ -x /usr/sbin/update-rc.d ] ; then
+            echo "### NOT starting elasticsearch by default on bootup, please execute"
+            echo " sudo update-rc.d elasticsearch defaults 95 10"
+            echo "### In order to start elasticsearch, execute"
+            echo " sudo /etc/init.d/elasticsearch start"
+        fi
 	fi
 	;;
 esac

src/deb/control/postrm

@@ -5,14 +5,23 @@ case "$1" in
     remove)
         # Remove logs
         rm -rf /var/log/elasticsearch
-        
+       
+        # disable elasticsearch service on systemd systems
+        if [ -x /bin/systemctl ] ; then
+            /bin/systemctl --no-reload disable elasticsearch.service > /dev/null 2>&1 || :
+        fi
         # remove **only** empty data dir
         rmdir --ignore-fail-on-non-empty /var/lib/elasticsearch
     ;;
 
     purge)
     	# Remove service
-        update-rc.d elasticsearch remove >/dev/null || true
+        # disable elasticsearch service on systemd systems
+        if [ -x /bin/systemctl ] ; then
+            /bin/systemctl --no-reload disable elasticsearch.service > /dev/null 2>&1 || :
+        else
+            update-rc.d elasticsearch remove >/dev/null || true
+        fi
     
         # Remove logs and data
         rm -rf /var/log/elasticsearch /var/lib/elasticsearch

src/deb/control/prerm

@@ -4,7 +4,9 @@ set -e
 [ -f /etc/default/elasticsearch ] && . /etc/default/elasticsearch
 
 stopElasticsearch() {
-	if [ -x "/etc/init.d/elasticsearch" ]; then
+    if [ -x /bin/systemctl ] ; then
+        /bin/systemctl --no-reload stop elasticsearch.service > /dev/null 2>&1 || :
+	elif [ -x "/etc/init.d/elasticsearch" ]; then
 		if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
 			invoke-rc.d elasticsearch stop || true
 		else

src/deb/systemd/elasticsearch.service

@@ -0,0 +1,26 @@
+[Unit]
+Description=Starts and stops a single elasticsearch instance on this system
+Documentation=http://www.elasticsearch.org
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+EnvironmentFile=/etc/default/elasticsearch
+User=elasticsearch
+Group=elasticsearch
+ExecStart=/usr/share/elasticsearch/bin/elasticsearch            \
+                            -Des.default.config=$CONF_FILE      \
+                            -Des.default.path.home=$ES_HOME     \
+                            -Des.default.path.logs=$LOG_DIR     \
+                            -Des.default.path.data=$DATA_DIR    \
+                            -Des.default.path.work=$WORK_DIR    \
+                            -Des.default.path.conf=$CONF_DIR
+# See MAX_OPEN_FILES in sysconfig
+LimitNOFILE=65535
+# See MAX_LOCKED_MEMORY in sysconfig, use "infinity" when MAX_LOCKED_MEMORY=unlimited and using bootstrap.mlockall: true
+#LimitMEMLOCK=infinity
+# Shutdown delay in seconds, before process is tried to be killed with KILL (if configured)
+TimeoutStopSec=20
+
+[Install]
+WantedBy=multi-user.target