I thought you might be interested in the resolution to this.
It turns out that we needed to reproduce the environment in tomcat.service
For some reason
ExecStart=/etc/rc.d/init.d/tomcat7 doesn't work
(file shown at the end of this message)
Instead, in /etc/systemd/system/tomcat.service
we have had to reproduce the environment in longhand to get it to work.
It appears that systemd doesn't expand variables so I really need to
investigate the systemd Environment thing a bit more.
Anyway, when I shutdown -r now the server comes back up and tomcat is
running at the unprivileged tomcat user on port 80 so that's a result
============== /etc/systemd/system/tomcat.service ============
[Unit]
Description=Apache Tomcat Web Application Container
After=network.target
[Service]
Type=forking
User=root
ExecStart=/opt/apache-tomcat-7.0.42/bin/jsvc \
-user tomcat \
-home /opt/jdk1.7.0_45 \
-Dcatalina.home=/opt/apache-tomcat-7.0.42 \
-Dcatalina.base=/opt/apache-tomcat-7.0.42 \
-Djava.io.tmpdir=/var/tmp \
-Djava.awt.headless=true \
-Xms512m \
-Xmx1024m \
-outfile /opt/apache-tomcat-7.0.42/logs/catalina.out \
-errfile /opt/apache-tomcat-7.0.42/logs/catalina.err \
-pidfile /var/run/tc7/jsvc.pid \
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager \
-Djava.util.logging.config.file=/opt/apache-tomcat-7.0.42/conf/logging.properties
\
-cp
/opt/apache-tomcat-7.0.42/bin/bootstrap.jar:/opt/apache-tomcat-7.0.42/bin/commons-daemon.jar:/opt/jdk1.7.0_45/lib/tools.jar:/opt/apache-tomcat-7.0.42/bin/tomcat-juli.jar
\
org.apache.catalina.startup.Bootstrap
ExecStop=/bin/kill -9 /var/run/tc7/jsvc.pid
ExecStopPost=/bin/rm -f /var/tc7lock/subsys/tomcat /var/run/tc7/jsvc.pid
[Install]
WantedBy=multi-user.target
Oh happy day
Thanks again to all responders
Lyallex
========= /etc/rc.d/init.d/tomcat7 =========
JAVA_HOME=/opt/jdk1.7.0_45
CATALINA_HOME=/opt/apache-tomcat-7.0.42
export JAVA_HOME CATALINA_HOME
CLASSPATH=$CATALINA_HOME/bin/bootstrap.jar:$CATALINA_HOME/bin/commons-daemon.jar:$JAVA_HOME/lib/tools.jar:$CATALINA_HOME/bin/tomcat-juli.jar
TOMCAT_USER=tomcat
TMPDIR=/var/tmp
PIDFILE=/var/run/tc7/jsvc.pid
RC=0
case "$1" in
start)
$CATALINA_HOME/bin/jsvc -user $TOMCAT_USER -home $JAVA_HOME
-Dcatalina.home=/opt/apache-tomcat-7.0.42
-Dcatalina.base=$CATALINA_HOME -Djava.io.tmpdir=$TMPDIR
-Djava.awt.headless=true \
-Xms512m \
-Xmx1024m \
-outfile $CATALINA_HOME/logs/catalina.out \
-errfile $CATALINA_HOME/logs/catalina.err \
-pidfile '/var/run/tc7/jsvc.pid' \
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager \
-Djava.util.logging.config.file=$CATALINA_HOME/conf/logging.properties \
-cp $CLASSPATH \
org.apache.catalina.startup.Bootstrap
RC=$?
[ $RC = 0 ] && touch /var/tc7lock/subsys/tomcat
echo "starting tomcat7 on darkstar with:"
echo "JAVA_HOME=$JAVA_HOME"
echo "CATALINA_HOME=$CATALINA_HOME"
echo "CLASSPATH=$CLASSPATH"
echo "tomcat started"
;;
stop)
PID=`cat /var/run/tc7/jsvc.pid`
kill $PID
RC=$?
[ $RC = 0 ] && rm -f /var/tc7lock/subsys/tomcat /var/run/tc7/jsvc.pid
echo "stopping tomcat7 on darkstar with:"
echo "JAVA_HOME=$JAVA_HOME"
echo "CATALINA_HOME=$CATALINA_HOME"
echo "CLASSPATH=$CLASSPATH"
echo "tomcat stopped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit $RC
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