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install -o root -g root -m 0755 -d /etc/systemd/system/tomcat9.service.d

cat <<'EOF' > /etc/systemd/system/tomcat9.service.d/override.conf
[Service]
Environment="JAVA_OPTS=-Djava.awt.headless=true -Xmx1gXmx3g"
Environment="JSSE_OPTS=-Djdk.tls.ephemeralDHKeySize=2048"
ExecStart=
ExecStart=/usr/bin/java \
  $JAVA_OPTS $JSSE_OPTS \
  -classpath ${CATALINA_HOME}/bin/bootstrap.jar:${CATALINA_HOME}/bin/tomcat-juli.jar \
  -Dcatalina.base=${CATALINA_BASE} \
  -Dcatalina.home=${CATALINA_HOME} \
  -Djava.util.logging.config.file=${CATALINA_BASE}/conf/logging.properties \
  -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager \
  -Djava.io.tmpdir=${CATALINA_TMPDIR} \
  org.apache.catalina.startup.Bootstrap
ReadWritePaths=/opt/shibboleth-idp/logs/
ReadWritePaths=/opt/shibboleth-idp/metadata/
EOF