How to check if ZooKeeper is running or up from command prompt

Question

I exploring a few options to setup kafka and I knew that the Zookeeper has to be up and running to initiate a kafka   I would like to know how can I find the below   1  hostname and port for my zookeeper instance---I checked the zoo cfg and I could only find the ClientPort not the hostname  will hostname be the hostname of my box    2  To check if ZooKeeper is up and running---I tried to do a ps -ef   grep  zoo  I could not find anything  May be I am using a wrong key word to search    Any help would be really appreciated

User · Answer

Go to bin directory of Zookeeper and type    zkServer sh status   For More info go through below link   http   www ibm com developerworks library bd-zookeeper   Hope this could help you

User · Answer

echo stat   nc localhost 2181   grep Mode echo srvr   nc localhost 2181   grep Mode   From 3 3 0 onwards    Above will work in whichever modes Zookeeper is running  standalone or embedded    Another way  If zookeeper is running in standalone mode  its a JVM process  so -   jps   grep Quorum   will display list of jvm processes  something like this for zookeeper with process ID  HQuorumPeer

User · Answer

To check if Zookeeper is accessible  One method is to simply telnet to the proper port and execute the stats command       root host    telnet localhost 2181 Trying 127 0 0 1    Connected to myhost  Escape character is       stats Zookeeper version  3 4 3-cdh4 0 1--1  built on 06 28 2012 23 59 GMT Clients   Latency min avg max  0 0 677 Received  4684478 Sent  4687034 Outstanding  0 Zxid  0xb00187dd0 Mode  leader Node count  127182 Connection closed by foreign host

User · Answer

One other way would be to use 4 letter commands to validate if zookeeper service is healthy or not  echo stat   nc  lt zookeeper ip gt  2181 echo mntr   nc  lt zookeeper ip gt  2181 echo isro    nc  lt zookeeper ip gt  2181   More details on the documentation link below https   zookeeper apache org doc r3 1 2 zookeeperAdmin html sc zkCommands

User · Answer

enter the below command to verify if zookeeper is running    echo  ruok    nc localhost 2181   echo    expected response  imok

User · Answer

I use      jps   Depending on your installation a running Zookeeper would look like     HQuorumPeer   or sth  with zookeeper in it s name

User · Answer

Zookeeper is just a Java process and when you start a Zookeeper instance it runs a org apache zookeeper server quorum QuorumPeerMain class  So you can check for a running Zookeeper like this   jps -l   grep zookeeper   or even like this   jps   grep Quorum   upd   regarding this  will hostname be the hostname of my box   - the answer is yes

User · Answer

I did some test   When it s running      usr lib zookeeper bin zkServer sh status JMX enabled by default Using config   usr lib zookeeper bin    conf zoo cfg Mode  follower   When it s stopped     zkServer status                                                                                                                                 JMX enabled by default Using config   usr local etc zookeeper zoo cfg Error contacting service  It is probably not running    I m not running on the same machine  but you get the idea

User · Answer

From a Windows 10   Open Command Promt then type telnet localhost 2181and then you type srvr OR From inside bin folder  open a PowerShell window and type zkServer sh status

[hadoop] How to check if ZooKeeper is running or up from command prompt?

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