Procedure for setting up a Hadoop cluster

The experiment is introduced

The next step is to set up a Hadoop cluster on three Linux VMS.

knowledge

  • Linux Basic Commands

Cluster installation

The following knowledge is required to complete the experiment

  1. Unpack the command

tar -zxvf XX.tar.gz -C dist

  1. Use of the VI editor

Vi + file Opens a file. Learn more about using the VI editor

  1. The remote copy

scp -r srcfile user@hostName:distpath

  1. Disable Firewall Command

    service iptables stop

  2. Install JDK in Linux

  3. Password-free login in Linux

  4. Hadoop Cluster basics

Preparation before experiment

  1. Three Linux VMS are available
  2. Configure IP and host The following table shows the configuration of this experiment
ip host The software name
192.168.1.111 linux1 Java8, hadoop,
192.168.1.112 linux2 Java8, hadoop
192.168.1.113 linux3 Java8, hadoop
  1. Configure cryptographic-free login. Cryptographic-free login solution Linux1 Cryptographic-free login Linux2 and Linux3
  2. Install jdk8
  3. Prepare the installation package of hadoop2.7.7

So let’s do the experiment.

Hadoop cluster building experiment

  1. Upload the Hadoop installation file to /root/apps/srcclauster
  2. Go to the primary node and create a directory apps as the installation directory
[root@linux1 ~]# mkdir  /root/apps
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  1. Unpack the hadoop
[root@linux1 ~]#tar -- ZXVF /root/srcclauster/ hadoop-2.1.7.tar. gz -c /root/appsCopy the code
  1. Configure hadoop

Go to the Hadoop configuration directory and open the hadoop-env.sh file to configure JAVA_HOME

[root@linux1 ~]# CD /root/srcclauster/hadoop-2.7.7/etc/hadoop [root@linux1 hadoop]# [root@linux1 hadoop]# vi hadoop-env.shCopy the code
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Set Hadoop-specific environment variables here.
# The only required environment variable is JAVA_HOME. All others are
# optional. When running a distributed configuration it is best to
# set JAVA_HOME in this file, so that it is correctly defined on
# remote nodes.

# The java implementation to use.
export JAVA_HOME = / root/appstest1 / jdk1.8.0 _101

# The jsvc implementation to use. Jsvc is required to run secure datanodes
# that bind to privileged ports to provide authentication of data transfer
# protocol. Jsvc is not required if SASL is configured for authentication of
# data transfer protocol using non-privileged ports.
#export JSVC_HOME=${JSVC_HOME}

export HADOOP_CONF_DIR=${HADOOP_CONF_DIR:-"/etc/hadoop"}
# Extra Java CLASSPATH elements. Automatically insert capacity-scheduler.
for f in $HADOOP_HOME/contrib/capacity-scheduler/*.jar; do
  if [ "$HADOOP_CLASSPATH" ]; then
    export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$f
  else
    export HADOOP_CLASSPATH=$f
  fi
done

# The maximum amount of heap to use, in MB. Default is 1000.
#export HADOOP_HEAPSIZE=
#export HADOOP_NAMENODE_INIT_HEAPSIZE=""
# Extra Java runtime options. Empty by default.
export HADOOP_OPTS="$HADOOP_OPTS -Djava.net.preferIPv4Stack=true"

# Command specific options appended to HADOOP_OPTS when specified
export HADOOP_NAMENODE_OPTS="-Dhadoop.security.logger=${HADOOP_SECURITY_LOGGER:-INFO,RFAS} -Dhdfs.audit.logger=${HDFS_AUDIT_LOGGER:-INFO,NullAppender} $HADOOP_NAMENODE_OPTS"
export HADOOP_DATANODE_OPTS="-Dhadoop.security.logger=ERROR,RFAS $HADOOP_DATANODE_OPTS"

export HADOOP_SECONDARYNAMENODE_OPTS="-Dhadoop.security.logger=${HADOOP_SECURITY_LOGGER:-INFO,RFAS} -Dhdfs.audit.logger=${HDFS_AUDIT_LOGGER:-INFO,NullAppender} $HADOOP_SECONDARYNAMENODE_OPTS"

export HADOOP_NFS3_OPTS="$HADOOP_NFS3_OPTS"
export HADOOP_PORTMAP_OPTS="-Xmx512m $HADOOP_PORTMAP_OPTS"

# The following applies to multiple commands (fs, dfs, fsck, distcp etc)
export HADOOP_CLIENT_OPTS="-Xmx512m $HADOOP_CLIENT_OPTS"
#HADOOP_JAVA_PLATFORM_OPTS="-XX:-UsePerfData $HADOOP_JAVA_PLATFORM_OPTS"

# On secure datanodes, user to run the datanode as after dropping privileges.
# This **MUST** be uncommented to enable secure HDFS if using privileged ports
# to provide authentication of data transfer protocol. This **MUST NOT** be
# defined if SASL is configured for authentication of data transfer protocol
# using non-privileged ports.
export HADOOP_SECURE_DN_USER=${HADOOP_SECURE_DN_USER}
# Where log files are stored. $HADOOP_HOME/logs by default.
#export HADOOP_LOG_DIR=${HADOOP_LOG_DIR}/$USER

# Where log files are stored in the secure data environment.
export HADOOP_SECURE_DN_LOG_DIR=${HADOOP_LOG_DIR}/${HADOOP_HDFS_USER}
# # #
# HDFS Mover specific parameters
# # #
# Specify the JVM options to be used when starting the HDFS Mover.
# These options will be appended to the options specified as HADOOP_OPTS
# and therefore may override any similar flags set in HADOOP_OPTS
#
# export HADOOP_MOVER_OPTS=""
# # #
# Advanced Users Only!
# # #

# The directory where pid files are stored. /tmp by default.
# NOTE: this should be set to a directory that can only be written to by 
# the user that will run the hadoop daemons. Otherwise there is the
# potential for a symlink attack.
export HADOOP_PID_DIR=${HADOOP_PID_DIR}
export HADOOP_SECURE_DN_PID_DIR=${HADOOP_PID_DIR}

# A string representing this instance of hadoop. $USER by default.
export HADOOP_IDENT_STRING=$USER
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Open the core-site. XML file to configure the primary node and working directory

[root@linux1 hadoop]# vi core-site.xml
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<! -- Put site-specific property overrides in this file. -->

<configuration>
  <property>
      <name>fs.defaultFS</name>
      <value>hdfs://linux1:9000</value>
  </property>
  <property>
      <name>hadoop.tmp.dir</name>
      <value>/root/appstest1/appdata</value>
  </property>
</configuration>
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Open mapred-site. XML to configure the MR running mode

[root@linux1 hadoop]# vi mapred-site.xm
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<! -- Put site-specific property overrides in this file. -->

<configuration>
  <property>
      <name>mapreduce.framework.name</name>
      <value>yarn</value>
  </property>
</configuration>

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Open the yarn-site. XML file to configure the primary node of YARN

[root@linux1 hadoop]# vi yarn-site.xml
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<configuration>
  <property>
      <name>yarn.resourcemanager.hostname</name>
      <value>linux1</value>
  </property>
  <property>
      <name>yarn.nodemanager.aux-services</name>
      <value>mapreduce_shuffle</value>
  </property>
</configuration>
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Configuration of slaves

[root@linux1 hadoop]# vi slaves
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linux2
linux3
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  1. Formatting HDFS
/ root @ linux1 ~ # / root/hadoop - 2.7.7 / bin/hadoop namenode - formatCopy the code
  1. Starting a Hadoop Cluster

Enter the linux1

[root@linux1 apps]# /root/apps/hadoop-2.7.7/sbin/start-dfs.sh 20/04/27 16:14:50 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable Starting namenodes on [linux1] linux1: Logging to /root/apps/hadoop-2.7.7/logs/hadoop-root-namenode-linux1.out linux3: datanode running as process 1618. Stop it first. linux2: Datanode running as process 1617. Stop it first. Starting secondary namenodes [0.0.0.0] 0.0.0.0: starting secondarynamenode, Logging to /root/apps/hadoop-2.7.7/logs/ hadoop-root-Secondarynamenode-linux1. out 20/04/27 16:15:08 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable [root@linux1 apps]#Copy the code
  1. Test whether the startup is successful

conclusion

Sh configure JAVA_HOME, core-site. XML configure the active node, mapred-site.xm configure the MR running mode, and yarn-site. XML configure the active node of YARN.

For other articles see juejin.cn/user/175884…