Support Questions

Find answers, ask questions, and share your expertise
Announcements
Celebrating as our community reaches 100,000 members! Thank you!

HDFS port 8020 not accessible from outside.

avatar

Followed all the instructions to set up the Hadoop 3.0 cluster and Ambari 2.7. HDFS port not accessible from outside.

1. The output of "netstat -tulapn | grep 8020 " from inside the server

tcp 0 0 127.0.1.1:8020 0.0.0.0:* LISTEN 11892/java

tcp 0 0 127.0.1.1:8020 127.0.0.1:52128 ESTABLISHED 11892/java

tcp 0 0 127.0.0.1:55998 127.0.1.1:8020 TIME_WAIT -

tcp 0 0 127.0.0.1:52128 127.0.1.1:8020 ESTABLISHED 11608/java

tcp 0 0 127.0.0.1:56118 127.0.1.1:8020 ESTABLISHED 13891/java

tcp 0 0 127.0.1.1:8020 127.0.0.1:56118 ESTABLISHED 11892/java

2. The output of "nc -zv mighadoop01.mydomain 8020" from outside.

nc: connectx to mighadoop01.mydomain port 8020 (tcp) failed: Connection refused

3. The output of "nc -zv mighadoop01.mydomain 8020" from inside the server.

Connection to mighadoop01.mydomain 8020 port [tcp/*] succeeded!

4. Server's /etc/hosts file

127.0.0.1localhost localhost.localdomain

::1ip6-localhost ip6-loopback

172.31.16.140mighadoop01 mighadoop01.mydomain

Any pointers would be much appreciated.

1 ACCEPTED SOLUTION

avatar
Expert Contributor

Please check the below property value in file hdfs-site.xml

<property>

<name>dfs.namenode.rpc-address</name>

<value></value>

</property>

if it is set as server hostname:8020 then ensure that server hostname is resolving to proper IP address

View solution in original post

11 REPLIES 11

avatar

Not sure if this is helpful. But, netstat on say port 9000, seems to deliver different results.

netstat -tulapn | grep 9000

Output:

tcp        0      0 172.31.16.140:40174     172.31.16.140:9000      TIME_WAIT   -
tcp6       0      0 :::9000                 :::*                    LISTEN      11114/java
tcp6       0      0 172.31.16.140:9000      172.31.16.140:40180     TIME_WAIT   -
tcp6       0      0 172.31.16.140:9000      172.31.16.140:40176     TIME_WAIT   -
tcp6       0      0 172.31.16.140:9000      172.31.16.140:40178     TIME_WAIT   -

avatar
New Contributor

Don't Write 127.0.0.1 node01 in your hosts file,Write 192.168.3.5 instead