apache zeppelin is started but there is connection error in localhost:8080 - apache-spark

Question

after successfully build apache zepellin on Ubuntu 14, I start zeppelin and it says successfully started but when I go to localhost:8080 Firefox shows unable to connect error like it didn't started but when I check Zeppelin status from terminal it says running and also I just copied config files templates so the config files are the default
update
changed the port to 8090 , here is the config file , but no change in result
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>zeppelin.server.addr</name>
<value>0.0.0.0</value>
<description>Server address</description>
</property>
<property>
<name>zeppelin.server.port</name>
<value>8090</value>
<description>Server port. port+1 is used for web socket.</description>
</property>
<property>
<name>zeppelin.websocket.addr</name>
<value>0.0.0.0</value>
<description>Testing websocket address</description>
</property>
<!-- If the port value is negative, then it'll default to the server
port + 1.
-->
<property>
<name>zeppelin.websocket.port</name>
<value>-1</value>
<description>Testing websocket port</description>
</property>
<property>
<name>zeppelin.notebook.dir</name>
<value>notebook</value>
<description>path or URI for notebook persist</description>
</property>
<property>
<name>zeppelin.notebook.storage</name>
<value>org.apache.zeppelin.notebook.repo.VFSNotebookRepo</value>
<description>notebook persistence layer implementation</description>
</property>
<property>
<name>zeppelin.interpreter.dir</name>
<value>interpreter</value>
<description>Interpreter implementation base directory</description>
</property>
<property>
<name>zeppelin.interpreters</name>
<value>org.apache.zeppelin.spark.SparkInterpreter,org.apache.zeppelin.spark.PySparkInterpreter,org.apache.zeppelin.spark.SparkSqlInterpreter,org.apache.zeppelin.spark.DepInterpreter,org.apache.zeppelin.markdown.Markdown,org.apache.zeppelin.angular.AngularInterpreter,org.apache.zeppelin.shell.ShellInterpreter,org.apache.zeppelin.hive.HiveInterpreter,org.apache.zeppelin.tajo.TajoInterpreter,org.apache.zeppelin.flink.FlinkInterpreter,org.apache.zeppelin.ignite.IgniteInterpreter,org.apache.zeppelin.ignite.IgniteSqlInterpreter</value>
<description>Comma separated interpreter configurations. First interpreter become a default</description>
</property>
<property>
<name>zeppelin.ssl</name>
<value>false</value>
<description>Should SSL be used by the servers?</description>
</property>
<property>
<name>zeppelin.ssl.client.auth</name>
<value>false</value>
<description>Should client authentication be used for SSL connections?</description>
</property>
<property>
<name>zeppelin.ssl.keystore.path</name>
<value>keystore</value>
<description>Path to keystore relative to Zeppelin configuration directory</description>
</property>
<property>
<name>zeppelin.ssl.keystore.type</name>
<value>JKS</value>
<description>The format of the given keystore (e.g. JKS or PKCS12)</description>
</property>
<property>
<name>zeppelin.ssl.keystore.password</name>
<value>change me</value>
<description>Keystore password. Can be obfuscated by the Jetty Password tool</description>
</property>
<!--
<property>
<name>zeppelin.ssl.key.manager.password</name>
<value>change me</value>
<description>Key Manager password. Defaults to keystore password. Can be obfuscated.</description>
</property>
-->
<property>
<name>zeppelin.ssl.truststore.path</name>
<value>truststore</value>
<description>Path to truststore relative to Zeppelin configuration directory. Defaults to the keystore path</description>
</property>
<property>
<name>zeppelin.ssl.truststore.type</name>
<value>JKS</value>
<description>The format of the given truststore (e.g. JKS or PKCS12). Defaults to the same type as the keystore type</description>
</property>
<!--
<property>
<name>zeppelin.ssl.truststore.password</name>
<value>change me</value>
<description>Truststore password. Can be obfuscated by the Jetty Password tool. Defaults to the keystore password</description>
</property>
-->
</configuration>
and here are the ports which are in listening state after zeppelin is started
tcp6 0 0 :::8081 :::* LISTEN
tcp6 0 0 ::1:631 :::* LISTEN
tcp6 0 0 :::8091 :::* LISTEN
tcp6 0 0 :::9001 :::* LISTEN
and Zeppelin is running [ OK ]
is the response I get when I run command bin/zeppelin-daemon.sh status

Answer 1

Check if you can reach it at 127.0.0.1:8080. This works for me, while localhost:8080 also is not reachable.

Answer 2

Also check other Zeppelin files, like interpreter.json and the notebook files. They might have saved config values that are overriding what you are setting in configuration.xsl.
I had a similar problem, mostly with the MASTER setting, but also with the port. I specified new values, but Zeppelin was ignoring them. I eventually discovered that Zeppelin had taken the value of the environment variable MASTER, and unknown to me, saved it into the interpreter.json file. You might try editing that file, or recreating your Zeppelin Interpreters.
In my case, I decided not to mess with that, just did a complete reinstalling of Zeppelin to ensure a clean slat. Then added the following lines to the zeppelin-env.sh file before starting:
export MASTER=local[*]
export ZEPPELIN_PORT=8088
That worked.

Answer 3

In zeppelin-site.xml file conf should be like as you did, add right spark master address in zeppelin-env.sh and interpreter.json file.
you can copy spark master address from spark-master log file.
I did like this and running fine.

Answer 4

I had the same issue. The solution that worked for me was to add the ip and domain name in etc/hosts.
If you go to logs folder where zeppelin is installed you may find more information. For me, that helped. The logs showed an "Caused by: java.net.UnknownHostException... Temporary failure in name resolution".
Adding the host name in etc/hosts solved the issue

Answer 5

In my case, spark and zeppelin version was conflicted. My zeppelin was not support spark 2.2.0(It's possible from new version : check outhttps://issues.apache.org/jira/browse/ZEPPELIN-2768). If someone has no errors on zeppelin log and can't get in localhost, check your zeppelin supports your spark version.