Marathon: Marathon won't start

[robertd]

Hi all,

I am following DO guide on how to install Mesos/Zookeeper/Marathon and configure it in 1 master and 2 slaves scenario, but I'm experiencing some issues.

Mesos is running just fine:

However Marathon is not starting at all:

Started marathon and checking status...

robertd@mesos-master:/etc/marathon/conf$ sudo start marathon
marathon start/running, process 10328
robertd@mesos-master:/etc/marathon/conf$ sudo status marathon
marathon stop/waiting

Starting marathon with 5 sec delay

robertd@mesos-master:/etc/marathon/conf$ sudo start marathon
marathon start/running, process 10696
robertd@mesos-master:/etc/marathon/conf$ sudo start marathon
start: Job is already running: marathon
robertd@mesos-master:/etc/marathon/conf$ sudo start marathon
marathon start/running, process 11064

For some reason it keeps crashing but I have no idea why.
Here are the contents of the etc/marathon/conf directory:

robertd@mesos-master:/etc/marathon/conf$ ll
total 24
drwxr-xr-x. 2 root root 4096 May 11 16:40 ./
drwxr-xr-x. 3 root root 4096 May 11 15:56 ../
-rw-r--r--. 1 root root   16 May 11 16:22 hostname       (xxx.xxx.xxx.xxx)
-rw-r--r--. 1 root root   32 May 11 16:22 master         (zk://xxx.xxx.xxx.xxx:2181/mesos)
-rw-r--r--. 1 root root   35 May 11 16:23 zk             (zk://xxx.xxx.xxx.xxx:2181/marathon)

Few additional marathon/mesos questions:

• How do you specify different port?
• How do you set cluster name?
• Can you set user-friendly name in the hostname and how? Every time I set it, mesos won't pickup the slave.

Thanks for your help in advance!

[robertd]

Checked the syslog:

May 12 10:09:18 mesos-master kernel: [2064323.693775] init: marathon main process (3579) terminated with status 1
May 12 10:09:18 mesos-master kernel: [2064323.693795] init: marathon main process ended, respawning
May 12 10:09:18 mesos-master marathon[3611]: Exception in thread "main" java.lang.UnsupportedClassVersionError: mesosphere/marathon/Main : Unsupported major.minor version 52.0
May 12 10:09:18 mesos-master marathon[3611]: #011at java.lang.ClassLoader.defineClass1(Native Method)
May 12 10:09:18 mesos-master marathon[3611]: #011at java.lang.ClassLoader.defineClass(ClassLoader.java:803)
May 12 10:09:18 mesos-master marathon[3611]: #011at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

[robertd]

I'll do as these guys suggest here and I'll report back...
https://issues.apache.org/jira/browse/MESOS-5147

[robertd]

It worked. Marathon needs jdk8. I forgot to mention that I'm on Ubuntu 14.04

sudo add-apt-repository ppa:openjdk-r/ppa
sudo apt-get update
sudo apt-get install openjdk-8-jdk
sudo update-alternatives --config java
sudo update-alternatives --config javac

[arslanqadeer]

Worked for me too. Thanks

[eromoe]

Great work! I install java8, but it is not the default java. The whole doc doen't mention that except one line saying install jdk 1.8, who would know it need set java8 as default if he doesn't familiar with java stack.