<sub>Posted on January 13, 2016 by [https://il.linkedin.com/in/knesenko '''Kiril Nesenko''']</sub><br />
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In my previous How-To [[Install and Configure a Production Ready Mesos Cluster on PhotonOS]]. In this How-To I am going to explain how to install and configure Marathon for Mesos cluster. All the following steps should be done on each Mesos master.
First, download Marathon:
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root@pt-mesos-master2 [ ~ ]# mkdir -p /opt/mesosphere/marathon/ && cd /opt/mesosphere/marathon/
root@pt-mesos-master2 [ /opt/mesosphere/marathon ]# curl -O http://downloads.mesosphere.com/marathon/v0.13.0/marathon-0.13.0.tgz
root@pt-mesos-master2 [ /opt/mesosphere/marathon ]# tar -xf marathon-0.13.0.tgz
root@pt-mesos-master2 [ /opt/mesosphere/marathon ]# mv marathon-0.13.0 marathon
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Create a configuration for Marathon:
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root@pt-mesos-master2 [ /opt/mesosphere/marathon ]# ls -l /etc/marathon/conf/
total 8
-rw-r--r-- 1 root root 68 Dec 24 14:33 master
-rw-r--r-- 1 root root 71 Dec 24 14:33 zk
root@pt-mesos-master2 [ /opt/mesosphere/marathon ]# cat /etc/marathon/conf/*
zk://192.168.0.2:2181,192.168.0.1:2181,192.168.0.3:2181/mesos
zk://192.168.0.2:2181,192.168.0.1:2181,192.168.0.3:2181/marathon
root@pt-mesos-master2 [ /opt/mesosphere/marathon ]# cat /etc/systemd/system/marathon.service
[Unit]
Description=Marathon
After=network.target
Wants=network.target
[Service]
Environment="JAVA_HOME=/opt/OpenJDK-1.8.0.51-bin"
ExecStart=/opt/mesosphere/marathon/bin/start \
--master zk://192.168.0.2:2181,192.168.0.1:2181,192.168.0.3:2181/mesos \
--zk zk://192.168.0.2:2181,192.168.0.1:2181,192.168.0.3:2181/marathon
Restart=always
RestartSec=20
[Install]
WantedBy=multi-user.target
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Finally, we need to change the Marathon startup script, since PhotonOS do not use the standard JRE. Make sure you add JAVA_HOME to Java path:
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root@pt-mesos-master2 [ /opt/mesosphere/marathon ]# tail -n3 /opt/mesosphere/marathon/bin/start
# Start Marathon
marathon_jar=$(find "$FRAMEWORK_HOME"/target -name 'marathon-assembly-*.jar' | sort | tail -1)
exec "${JAVA_HOME}/bin/java" "${java_args[@]}" -jar "$marathon_jar" "${app_args[@]}"
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Now we can start the Marthon service:
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root@pt-mesos-master2 [ /opt/mesosphere/marathon ]# systemctl start marathon
root@pt-mesos-master2 [ /opt/mesosphere/marathon ]# ps -ef | grep marathon
root 15821 1 99 17:14 ? 00:00:08 /opt/OpenJDK-1.8.0.51-bin/bin/java -jar /opt/mesosphere/marathon/bin/../target/scala-2.11/marathon-assembly-0.13.0.jar --master zk://192.168.0.2:2181,192.168.0.1:2181,192.168.0.3:2181/mesos --zk zk://192.168.0.2:2181,192.168.0.1:2181,192.168.0.3:2181/marathon
root 15854 14692 0 17:14 pts/0 00:00:00 grep --color=auto marathon
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Next - [[Install and Configure DCOS CLI for Mesos]]