Shulou(Shulou.com)06/03 Report--

Next we will start a single instance zookeeper and build the simplest zookeeper cluster on this basis. In order to implement the simplest concept, our cluster will have only three nodes, and they will all be on the same machine.

All right, let's get to work!

Single instance 1. Extract the installation package and copy the configuration file

Tar-xvzf zookeeper-3.4.12.tar.gz

After decompression, go to the conf directory and copy a configuration file:

Cp zoo_sample.cfg zoo.cfg

two。 Modify dataDir

Although optional, it's best to move data out of the / tmp directory. I created a data directory under the zookeeper installation directory and executed it under the zookeeper directory:

Mkdir data

Then modify the dataDir in the zoo.cfg file. The contents of my modified file are as follows:

TickTime=2000initLimit=10syncLimit=5dataDir=/home/ym/zookeeper/zookeeper-3.4.12/dataclientPort=21813. Start the instance

Execute the following in the bin directory:

. / zkServer.sh start

The following indicates success:

[ym@localhost bin] $. / zkServer.sh startZooKeeper JMX enabled by defaultUsing config: / home/ym/zookeeper/zookeeper-3.4.12/bin/../conf/zoo.cfgStarting zookeeper. STARTED cluster building 1. Modify the configuration file

First, make a copy from the above single instance configuration file zoo.cfg:

Cp zoo.cfg zoo1.cfg

Modify the content as follows:

TickTime=2000initLimit=10syncLimit=5dataDir=/home/ym/zookeeper/zookeeper-3.4.12/data1clientPort=2182server.1=127.0.0.1:2222:2223server.2=127.0.0.1:3333:3334server.3=127.0.0.1:4444:4445

Create zoo2.cfg and zoo3.cfg:

Cp zoo1.cfg zoo2.cfgcp zoo1.cfg zoo3.cfg

Modify the clientPort of 2183 and 2184 in zoo2.cfg and zoo3.cfg, and point to data2 and data3 in dataDir. The modified contents are as follows:

Data2.cfg

TickTime=2000initLimit=10syncLimit=5dataDir=/home/ym/zookeeper/zookeeper-3.4.12/data2clientPort=2183server.1=127.0.0.1:2222:2223server.2=127.0.0.1:3333:3334server.3=127.0.0.1:4444:4445

Data3.cfg

TickTime=2000initLimit=10syncLimit=5dataDir=/home/ym/zookeeper/zookeeper-3.4.12/data3clientPort=2183server.1=127.0.0.1:2222:2223server.2=127.0.0.1:3333:3334server.3=127.0.0.1:4444:4445

Each server.n entry specifies the address and port number used by the ZooKeeper server numbered n. Each server.n entry is divided into three parts by colons. The first part is the IP address or hostname (hostname) of server n, and the second and third parts are TCP port numbers, which are used for arbitration communication and group head election, respectively. Because we are running three server processes on the same machine, we need to use a different port number in each entry. Typically, we run each server process on a different server, so each server item can be configured with the same port number.

2 create a data directory

Execute to the zookeeper installation directory:

Mkdir data1mkdir data2mkdir data3

When starting a server, we need to know which server is started. A suit.

The server gets the server ID information by reading a file called myid under the data directory. But

To create these files with the following command:

Echo 1 > data1/myidecho 2 > data2/myidecho 3 > data3/myid3 start the instance

Open the three terminals and execute them in the zookeeper directory:

Bin/zkServer.sh start.. / conf/zoo1.cfgbin/zkServer.sh start.. / conf/zoo2.cfgbin/zkServer.sh start.. / conf/zoo3.cfg4 uses zkCli.sh to access the cluster

Bin/zkCli.sh-server 127.0.0.1 purl 2182127.0.0.1 purl 2183127.0.0.1purl 2184

The following message appears:

[myid:]-INFO [...]-Session establishmentcomplete on server localhost/127.0.0.1:2182.

The ostensible client connects to the zookeeper server with port 2182.

Use ctrl+c to stop and re-use the above command to connect, so several times you will find that the connected port changes back and forth in 2182, 2183, and 2184.

Reference: "ZooKeeper- distributed process collaboration Technology"

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