Question

UnknownHostException - CentOS droplet running tomcat7

  • Posted May 19, 2014

I changed my password, restarted the droplet and I couldnt start tomcat ever since, when I try to start tomcat if get “UnknownHostException”.

WHAT I tried so far:

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 188.226.197.221 beta.mydomainName.com ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

  • restarted the droplet, but its same issue. is my naming correct FQDN

2014-05-19 08:21:02,246 [localhost-startStop-1] ERROR ehcache.Cache - Unable to set localhost. This prevents creation of a GUID. Cause was: betaEgangan: betaEgangan: Name or service not known java.net.UnknownHostException: betaEgangan: betaEgangan: Name or service not known at java.net.InetAddress.getLocalHost(InetAddress.java:1473) at net.sf.ehcache.Cache.<clinit>(Cache.java:200) at net.sf.ehcache.config.ConfigurationHelper.createCache(ConfigurationHelper.java:302) at net.sf.ehcache.config.ConfigurationHelper.createDefaultCache(ConfigurationHelper.java:218) at net.sf.ehcache.CacheManager.configure(CacheManager.java:618) at net.sf.ehcache.CacheManager.init(CacheManager.java:361) at net.sf.ehcache.CacheManager.<init>(CacheManager.java:230) at net.sf.ehcache.hibernate.EhCacheRegionFactory.start(EhCacheRegionFactory.java:70) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:744) Caused by: java.net.UnknownHostException: betaEgangan: Name or service not known at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901) at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1293) at java.net.InetAddress.getLocalHost(InetAddress.java:1469) … 12 more

I can not ping this ip from outside the box

but ofcourse i can from within.

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Try replacing <pre>HOSTNAME=myhostname</pre> with <pre>HOSTNAME=beta.mydomainName.com</pre> <br>Reboot your droplet, does that fix it?

even i am facing same error . <br> <br>/etc/sysconfig/network file contains <br> <br>HOSTNAME=myhostname <br> <br>$hostname -f <br>hostname: Unknown host <br> <br>what may be the error ? <br> <br>

What’s the output of running <code>hostname -f</code> in the console? What are the contents of your <code>/etc/sysconfig/network</code> file?