question Re: Not able to start zookeeper after CDH 4.1 Installation in Archives of Support Questions (Read Only)

Not able to start zookeeper after CDH 4.1 Installation

abhishes — Fri, 16 Sep 2022 09:02:18 GMT

I created 3 VMs called nn1, nn2, and jt1 and assigned static IP addresses to each. I ensured that all VMs are able to ping one another.

I also edited the hosts file on each VM to that nn1, nn2 and jt1 have entries against their IP addresses.

Then I installed jdk-6u45-linux-x64-rpm.bin on each of the VMs.

Next i executed this command on all 3 VMs

wget http://
archive.cloudera.com/cdh4/redhat/6/x86_64/cdh/cloudera-cdh4.repo
cp cloudera-cdh4.repo /etc/yum.repos.d/
rpm --import http://archive.cloudera.com/cdh4/redhat/6/x86_64/cdh/RPM-
GPG-KEY-cloudera

Then I installed the following on all 3 nodes

yum install hadoop-hdfs-namenode
yum install hadoop-hdfs-journalnode
yum install zookeeper-server

I installed this only on nn1 and nn2

yum install hadoop-hdfs-zkfc

Finally I edit the /etc/zookeper/conf/zoo.cfg and added 3 lines (on all 3 machines)

server.1=nn1:2888:3888
server.2=nn2:2888:3888
server.3=jt1:2888:3888

I also executed this command on each machine

firewall-cmd --zone=dmz --add-port=2888/tcp --permanent
firewall-cmd --zone=dmz --add-port=3888/tcp --permanent
firewall-cmd --reload

But I keep seeing these errors in the /var/log/zookeeper/zookeeper.log file of each machine

WARN [WorkerSender[myid=1]:QuorumCnxManager@368] - Cannot open channel to 3 at election address jt1/192.168.1.32:3888 java.net.NoRouteToHostExceptoin: No route to host at java.net.PlainSocketImpl.socketConnect(Native Method)

Can you please tell me if I have left out a step in my cdh 4.1 configuration and also how can I troubleshoot this.

Also... I can see the word "WARN" here so is it just a warning? how can I know if my zookeeper is running successfully (perhaps with some warnings).

Can you please help me and sorry if this is FAQ.

Re: Not able to start zookeeper after CDH 4.1 Installation

ben.hemphill — Thu, 17 Jul 2014 08:39:39 GMT

no route to host suggests you are getting blocked still, using ping as a network test usually isn't sufficient as it uses the ICMP protocol and doesn't have a port per se.

a better test would be:

nc -z 192.168.1.32 3888

Re: Not able to start zookeeper after CDH 4.1 Installation

abhishes — Fri, 18 Jul 2014 22:09:47 GMT

for me it says

nc: invalid option -- 'z'

Ncat: try --help or main(1) ncat for more information, usage options and help.

QUITTING

Re: Not able to start zookeeper after CDH 4.1 Installation

ben.hemphill — Mon, 21 Jul 2014 19:01:36 GMT

ah you are on a different version of netcat

try

nc 192.168.1.32 3888

Re: Not able to start zookeeper after CDH 4.1 Installation

abhishes — Mon, 21 Jul 2014 22:14:23 GMT

I was able to successfully nc into all machines except one.

I went and re-issued these commands on that machine and that resolved the issue.

servicectl stop firewalld.service

servicectl disable firewalld.service

Thank you so much!!!!!