First of all, Xiaobian here is the installation of zookeeper in the Linux environment.
1. Prepare the environment
(2n-1 linux machines or virtual machines: Since zookeeper's paxos algorithm requires more than half of the survival to be available, it is necessary to prepare a single server to build the environment)
2. Upload
Use the tool to upload the zookeeper installation file to /home/hadoop , and make sure the user book hadoop of the file,
If not, you need to modify the owner of the file with the root user.
Order:
su – root
cd /home/hadoop
chown hadoop:hadoop zookeeper-3.4.5.tar.gz
su - hadoop
3. Unzip
Unzip with hadoop user, if you are not hadoop user, you need su – hadoop
tar –zxvf zookeeper-3.4.5.tar.gz
4. Rename
Need to be hadoop user
mv zookeeper-3.4.5 zookeeper
5. Modify the environment variables (every zookeeper machine in the cluster must be changed)
5.1. Execute on the first machine of zookeeper
1、su – root
2、vi /etc/profile
3. Add content:
export ZOOKEEPER_HOME=/home/hadoop/zookeeper export PATH=$PATH:$ZOOKEEPER_HOME/bin |
4. Recompile
source /etc/profile
5. Switch users
su – hadoop
5.2. Do the same steps on other machines in zookeeper
see above
6. Modify the zookeeper configuration file
1、 su – hadoop
2、 cd /home/hadoop/zookeeper/conf
3. cp zoo_sample.cfg zoo.cfg (copy a backup first)
4 、 vi zoo.cfg
5. Add content, in which the domain name needs to be considered by yourself
dataDir=/home/hadoop/zookeeper/data dataLogDir=/home/hadoop/zookeeper/log server.1=slave1:2888:3888 server.2=slave2:2888:3888 server.3=slave3:2888:3888 |
Simple parsing of configuration files
1. tickTime: This time is used as the time interval for maintaining heartbeats between Zookeeper servers or between clients and servers, that is, a heartbeat will be sent every tickTime.
2. dataDir: As the name suggests, it is the directory where Zookeeper saves data. By default, Zookeeper also saves log files for writing data in this directory.
3. dataLogDir: As the name suggests, it is the directory where Zookeeper saves log files.
4. clientPort: This port is the port through which the client connects to the Zookeeper server. Zookeeper will listen to this port and accept client access requests.
6. Create a folder
cd /home/hadoop/zookeeper
mkdir data
mkdir log
chmod 755 data
chmod 755 log
7. Create myid file and add content
cd /home/hadoop/zookeeper/data
vi myid
Added content:
1 |
7. Transfer zookeeper to other machines
scp –r /home/hadoop/zookeeperhadoop@slave1:/home/hadoop
scp –r /home/hadoop/zookeeperhadoop@slave2:/home/hadoop
scp –r /home/hadoop/zookeeperhadoop@slave3:/home/hadoop
8. Modify the configuration files of other machines
8.1. Execute the command on the slave2 machine:
su – hadoop
cd /home/hadoop/zookeeper/data
vi myid
修改内容，将1改为2
2 |
8.2. 在slave3机器上执行命令：
su – hadoop
cd /home/hadoop/zookeeper/data
vi myid
修改内容，将1改为3
3 |
9. 启动
9.1. 在slave1上执行：
zkServer.sh start（别忘了加上./命令）
9.2. 在slave2上执行：
zkServer.sh start
9.3. 在slave3上执行：
zkServer.sh start
10. 查看
10.1. 在slave1上执行
jps
zkServer.sh status
10.2. 在slave2上执行
jps
zkServer.sh status
10.3. 在slave3上执行
jps
zkServer.sh status