(搭建集群部分借鉴了kiwenlau/hadoop-cluster-docker中的内容,不过那里的基础环境是Ubuntu,本人这里是用的CentOS7,因此也糟了不少坑!)
目录索引
一、编辑Hadoop运行环境中的配置文件
二、使用Dockerfile制作Hadoop的镜像
三、激情的排坑之旅
四、最终的文件内容
— config/core-site.xml
— config/hadoop-env.sh
— config/hdfs-site.xml
— config/mapred-site.xml
— config/run-wordcount.sh
— config/slaves
— config/ssh_config
— config/start-hadoop.sh
— config/yarn-site.xml
— Dockerfile
— start-container.sh
— stop-container.sh
— remove-container.sh
— resize-cluster.sh
附:命令行纯净版
一、编辑Hadoop运行环境中的配置文件
-
创建文件夹和文件
先创建个文件夹来放相关的文件,并创建配置文件的文件夹,新建几个文件。
$ mkdir -p hadoop-docker/config $ cd hadoop-docker $ touch Dockerfile start-container.sh config/ssh_config config/start-hadoop.sh config/run-wordcount.sh
-
复制Hadoop的64位编译文件
将编译好的64位版本的Hadoop包复制到当前目录中。(编译64位Hadoop,看这里)
-
复制Hadoop中的配置文件
解压编译好的64位版本的Hadoop包,从里面复制点配置项出来修改(不然命令行下全手写还不累死啦!)。
$ export version=2.7.3 $ tar -xzvf hadoop-$version.tar.gz $ copy hadoop-$version/etc/hadoop/core-site.xml config/core-site.xml $ copy hadoop-$version/etc/hadoop/hadoop-env.sh config/hadoop-env.sh $ copy hadoop-$version/etc/hadoop/hdfs-site.xml config/hdfs-site.xml $ copy hadoop-$version/etc/hadoop/mapred-site.xml.template config/mapred-site.xml $ copy hadoop-$version/etc/hadoop/yarn-site.xml config/yarn-site.xml
-
编辑配置文件:ssh_config
Hadoop节点之间通讯使用的是ssh,这里设置ssh_config的配置文件,增加无密码登录设置。使用vi编辑config文件夹下的ssh_config,加入以下的内容:
Host localhost StrictHostKeyChecking no Host 0.0.0.0 StrictHostKeyChecking no Host hadoop-* StrictHostKeyChecking no UserKnownHostsFile=/dev/null
-
编辑配置文件:core-site.xml
使用vi编辑config文件夹下的core-site.xml,在configuration中间加入以下内容:
fs.defaultFS hdfs://hadoop-master:9000/ -
编辑配置文件:hdfs-site.xml
使用vi编辑config文件夹下的hdfs-site.xml,在configuration中间加入以下内容:
dfs.namenode.name.dir file:///root/hdfs/namenode NameNode directory for namespace and transaction logs storage. dfs.datanode.data.dir file:///root/hdfs/datanode DataNode directory dfs.replication 2 -
编辑配置文件:mapred-site.xml
使用vi编辑config文件夹下的mapred-site.xml,在configuration中间加入以下内容:
mapreduce.framework.name yarn -
编辑配置文件:yarn-site.xml
使用vi编辑config文件夹下的yarn-site.xml,在configuration中间加入以下内容:
yarn.nodemanager.aux-services mapreduce_shuffle yarn.nodemanager.aux-services.mapreduce_shuffle.class org.apache.hadoop.mapred.ShuffleHandler yarn.resourcemanager.hostname hadoop-master -
编辑环境配置脚本:hadoop-env.sh
使用vi编辑config文件夹下的hadoop-env.sh,找到JAVA_HOME设置,修改为如下(其他内容不变):
export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk
(呵呵,其实这里有问题,后面排坑的时候再说!)
编辑从节点记录:slaves
hadoop-slave1
hadoop-slave2
这个后面有个脚本可以根据从节点数量自动生成。
- 编辑启动Hadoop的脚本:start-hadoop.sh
使用vi编辑config文件夹下的start-hadoop.sh,用于在Master上执行启动hadoop的命令:
#!/bin/bash
echo -e "\n"
$HADOOP_HOME/sbin/start-dfs.sh
echo -e "\n"
$HADOOP_HOME/sbin/start-yarn.sh
echo -e "\n"
-
编辑运行入门程序WordCount的脚本:run-wordcount.sh
使用vi编辑config文件夹下的run-wordcount.sh,用来运行Hadoop的入门程序WordCount:
#!/bin/bash # test the hadoop cluster by running wordcount # create input files mkdir input echo "Hello Docker" >input/file2.txt echo "Hello Hadoop" >input/file1.txt # create input directory on HDFS hadoop fs -mkdir -p input # put input files to HDFS hdfs dfs -put ./input/* input # run wordcount hadoop jar $HADOOP_HOME/share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.7.3-sources.jar org.apache.hadoop.examples.WordCount input output # print the input files echo -e "\ninput file1.txt:" hdfs dfs -cat input/file1.txt echo -e "\ninput file2.txt:" hdfs dfs -cat input/file2.txt # print the output of wordcount echo -e "\nwordcount output:" hdfs dfs -cat output/part-r-00000
二、使用Dockerfile制作Hadoop的镜像
Hadoop镜像中到相关配置文件和脚本都写好了,开始编辑Dockerfile并制作Hadoop的镜像。
使用vi打开Dockerfile,开始编辑其中的内容。
-
添加基础镜像和基本信息
这里用的基础镜像是centos7环境并开通了systemd启动管理程序,具体生成可参见之前的文章(使用Docker编译64位的Hadoop)。
# 镜像来源 FROM centos7-systemd # 镜像创建者(写入自己的信息) MAINTAINER "you"
# 指定目录 WORKDIR /root -
安装运行环境需要的软件
安装Java jdk和openssh。
RUN yum update -y && \ yum install -y java-1.7.0-openjdk \ openssh-server
(其实这里还不够,还是后面排坑的时候再说。)
-
复制Hadoop并安装
这里设置了个环境变量方便在更换版本的时候修改。
# 复制Hadoop ENV HADOOP_VERSION=2.7.3 COPY hadoop-$HADOOP_VERSION.tar.gz /root/hadoop-$HADOOP_VERSION.tar.gz # 安装 RUN tar -xzvf hadoop-$HADOOP_VERSION.tar.gz && \ mv hadoop-$HADOOP_VERSION /usr/local/hadoop && \ rm hadoop-$HADOOP_VERSION.tar.gz
-
设置环境变量
设置JAVA_HOME,HADOOP_HOME。
ENV JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk ENV HADOOP_HOME=/usr/local/hadoop ENV PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
(这里也漏了一个,另外JAVA_HOME也有问题,后面排坑的时候……)
-
设置SSH免密码登录
RUN ssh-keygen -t rsa -f ~/.ssh/id_rsa -P '' && \ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
-
复制配置文件到Hadoop下
COPY config/* /tmp/ RUN mv /tmp/ssh_config ~/.ssh/config && \ mv /tmp/hadoop-env.sh /usr/local/hadoop/etc/hadoop/hadoop-env.sh && \ mv /tmp/hdfs-site.xml $HADOOP_HOME/etc/hadoop/hdfs-site.xml && \ mv /tmp/core-site.xml $HADOOP_HOME/etc/hadoop/core-site.xml && \ mv /tmp/mapred-site.xml $HADOOP_HOME/etc/hadoop/mapred-site.xml && \ mv /tmp/yarn-site.xml $HADOOP_HOME/etc/hadoop/yarn-site.xml && \ mv /tmp/slaves $HADOOP_HOME/etc/hadoop/slaves && \ mv /tmp/start-hadoop.sh ~/start-hadoop.sh && \ mv /tmp/run-wordcount.sh ~/run-wordcount.sh RUN chmod +x ~/start-hadoop.sh && \ chmod +x ~/run-wordcount.sh && \ chmod +x $HADOOP_HOME/sbin/start-dfs.sh && \ chmod +x $HADOOP_HOME/sbin/start-yarn.sh
(这里也有个权限的问题,后面排坑……)
-
设置节点
创建目录,并格式化HDFS。
RUN mkdir -p ~/hdfs/namenode && \ mkdir -p ~/hdfs/datanode && \ mkdir $HADOOP_HOME/logs RUN $HADOOP_HOME/bin/hdfs namenode -format
-
设置容器打开后运行ssh
CentOS7基础镜像中开通了systemd作为启动守护,所以这里使用systemctl开启ssh服务。
CMD [ "sh", "-c", "systemctl start sshd; bash"]
这样Dockerfile就编写完成,再增加一个脚本用来启动指定节点数量的Hadoop集群,内容如下:
#!/bin/bash
# 默认节点数3个(即一个master,两个slave)
N=${1:-3}
# 开启Hadoop-Master容器
sudo docker rm -f hadoop-master &> /dev/null
echo "start hadoop-master container..."
sudo docker run -itd \
--net=hadoop \
-p 50070:50070 \
-p 8088:8088 \
--name hadoop-master \
--hostname hadoop-master \
hadoop-docker &> /dev/null
# 开启Hadoop-Slave容器
i=1
while [ $i -lt $N ]
do
sudo docker rm -f hadoop-slave$i &> /dev/null
echo "start hadoop-slave$i container..."
sudo docker run -itd \
--net=hadoop \
--name hadoop-slave$i \
--hostname hadoop-slave$i \
hadoop-docker &> /dev/null
i=$(( $i + 1 ))
done
# 进入Hadoop-Master容器的命令行
sudo docker exec -it hadoop-master bash
(这里其实也有问题,后面……)
好了,一切准备就绪了开始运行!…………这是咋的了呢?……
三、激情的排坑之旅
果然没有一切顺利的,从弄镜像开始就出问题了,一一排查解决吧!想直接看最后的正确内容可以直接看【四、最终的文件内容】或者【附:命令行纯净版】。
-
构建镜像:hdfs,命令没找到
$ docker build -t hadoop-docker .
报错:hdfs命令没找到,仔细再看报错其实是:
libexec/hdfs-config.sh:No such file or directory
查找了一下,原来是缺少一个环境变量,在Dockerfile环境变量设置那里增加一行:
ENV HADOOP_LIBEXEC_DIR=$HADOOP_HOME/libexec
-
启动Hadoop:JAVA_HOME,没找到这个目录
再次构建,构建成功了。使用脚本启动全部集群容器(默认的3个Node):
$ ./start-container.sh
进入Hadoop-Master的命令行后,使用脚本启动Hadoop:
$ ./start-hadoop.sh
报错:/usr/lib/jvm/java-1.7.0-openjdk:No such file or directory
这个目录其实是根据网上yum安装的路径自己猜的,应该有问题,即然在容器里直接去看看好了:
$ ls /usr/lib/jvm java-1.7.0-openjdk-1.7.0.131-2.6.9.0.e17_3.x86_64 jre jre-1.7.0 jre-1.7.0-openjdk jre-1.7.0-openjdk-1.7.0.131-2.6.9.0.e17_3.x86_64 jre-openjdk
晕……原来是有版本的小编号的,这以后是不是每次安装版本不同了就不一样了啊,如果写这个进去岂不是每次都要生成好看看小编号再重新构建?!想了想反正这里只是用运行环境,直接改成jre试试,一次尝试修改JAVA_HOME为jre-1.7.0-openjdk,包括Dockerfile以及config/hadoop-env.sh两个文件。
-
启动Hadoop:ssh,连接失败
重新构建,再次启动Hadoop,还是报错:ssh无法连接。试了一下ssh的服务根本没启动,直接运行:
$ systemctl start sshd
报错:Failed to get D-Bus connection
网上反映这个错误的不少,据说是CentOS7在Docker下著名的Bug,最后找到解决方案,在我们启动容器的脚本start-container.sh中修改启动主节点和从节点的docker run命令,增加内容:
sudo docker run -itd \ # 这行新加 --privileged -e "container=docker" -v /sys/fs/cgroup:/sys/fs/cgroup \ --net=hadoop \ -p 50070:50070 \ -p 8088:8088 \ --name hadoop-master \ --hostname hadoop-master \ hadoop-docker &> /dev/null \ # 这行新加 /usr/sbin/init
这样保证在容器开启时运行/usr/sbin/init,以此开启D-Bus服务。
-
启动Hadoop:ssh,不好的权限设置
再次启动容器,启动Hadoop,还是报错:
Bad owner or permissions on ~/.ssh/config
再次找到解决方案,在Dockerfile镜像生成时修改这个config的权限为600,即在Dockerfile中增加一行:
RUN chmod 600 ~/.ssh/config
-
启动Hadoop:ssh,无法连接
再次构建,再次启动容器,再次启动Hadoop,还来ssh无法连接!
原来我只安装了server没装client吗,怎么连接!修改Dockerfile的软件安装为:
RUN yum update -y && \ yum install -y java-1.7.0-openjdk \ openssh-server \ openssh-clients
-
启动Hadoop:hdfs,命令没找到
还没完啊!这次又是万恶的hdfs命令没找到,开始一直纠结在提示里的hdfs-config.sh这个文件没有的问题,排查了很久,后来再仔细看了看发现了一个错误:
which:command not found
这……个which是个命令?查一下原来就是这个which没有安装的原因!!再次修改Dockerfile中的软件安装为:
RUN yum update -y && \ yum install -y java-1.7.0-openjdk \ openssh-server \ openssh-clients \ which
再次构建……再次开启容器……再次开启Hadoop,正常了……
运行WordCount:
$ ./run-wordcount.sh
也正确了!
四、最终的文件内容
这里列出全部文件的内容,觉得麻烦也可以直接访问项目hadoop-centos-docker。
config/core-site.xml
fs.defaultFS
hdfs://hadoop-master:9000/
config/hadoop-env.sh
# 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=/usr/lib/jvm/jre-1.7.0-openjdk
# 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
config/hdfs-site.xml
dfs.namenode.name.dir
file:///root/hdfs/namenode
NameNode directory for namespace and transaction logs storage.
dfs.datanode.data.dir
file:///root/hdfs/datanode
DataNode directory
dfs.replication
2
config/mapred-site.xml
mapreduce.framework.name
yarn
config/run-wordcount.sh
#!/bin/bash
# test the hadoop cluster by running wordcount
# create input files
mkdir input
echo "Hello Docker" >input/file2.txt
echo "Hello Hadoop" >input/file1.txt
# create input directory on HDFS
hadoop fs -mkdir -p input
# put input files to HDFS
hdfs dfs -put ./input/* input
# run wordcount
hadoop jar $HADOOP_HOME/share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.7.3-sources.jar org.apache.hadoop.examples.WordCount input output
# print the input files
echo -e "\ninput file1.txt:"
hdfs dfs -cat input/file1.txt
echo -e "\ninput file2.txt:"
hdfs dfs -cat input/file2.txt
# print the output of wordcount
echo -e "\nwordcount output:"
hdfs dfs -cat output/part-r-00000
config/slaves
hadoop-slave1
hadoop-slave2
config/ssh_config
Host localhost
StrictHostKeyChecking no
Host 0.0.0.0
StrictHostKeyChecking no
Host hadoop-*
StrictHostKeyChecking no
UserKnownHostsFile=/dev/null
config/start-hadoop.sh
#!/bin/bash
echo -e "\n"
$HADOOP_HOME/sbin/start-dfs.sh
echo -e "\n"
$HADOOP_HOME/sbin/start-yarn.sh
echo -e "\n"
config/yarn-site.xml
yarn.nodemanager.aux-services
mapreduce_shuffle
yarn.nodemanager.aux-services.mapreduce_shuffle.class
org.apache.hadoop.mapred.ShuffleHandler
yarn.resourcemanager.hostname
hadoop-master
Dockerfile
# 镜像来源
FROM centos7-systemd
# 镜像创建者(写入自己的信息)
MAINTAINER "you"
# 指定目录
WORKDIR /root
# 安装软件
RUN yum update -y && \
yum install -y java-1.7.0-openjdk \
openssh-server \
openssh-clients \
which
# 复制Hadoop
ENV HADOOP_VERSION=2.7.3
COPY hadoop-$HADOOP_VERSION.tar.gz /root/hadoop-$HADOOP_VERSION.tar.gz
# 安装
RUN tar -xzvf hadoop-$HADOOP_VERSION.tar.gz && \
mv hadoop-$HADOOP_VERSION /usr/local/hadoop && \
rm hadoop-$HADOOP_VERSION.tar.gz
# 设置环境变量
ENV JAVA_HOME=/usr/lib/jvm/jre-1.7.0-openjdk
ENV HADOOP_HOME=/usr/local/hadoop
ENV PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
ENV HADOOP_LIBEXEC_DIR=$HADOOP_HOME/libexec
# ssh无密码登录
RUN ssh-keygen -t rsa -f ~/.ssh/id_rsa -P '' && \
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
# 复制配置文件及配置权限
COPY config/* /tmp/
RUN mv /tmp/ssh_config ~/.ssh/config && \
mv /tmp/hadoop-env.sh /usr/local/hadoop/etc/hadoop/hadoop-env.sh && \
mv /tmp/hdfs-site.xml $HADOOP_HOME/etc/hadoop/hdfs-site.xml && \
mv /tmp/core-site.xml $HADOOP_HOME/etc/hadoop/core-site.xml && \
mv /tmp/mapred-site.xml $HADOOP_HOME/etc/hadoop/mapred-site.xml && \
mv /tmp/yarn-site.xml $HADOOP_HOME/etc/hadoop/yarn-site.xml && \
mv /tmp/slaves $HADOOP_HOME/etc/hadoop/slaves && \
mv /tmp/start-hadoop.sh ~/start-hadoop.sh && \
mv /tmp/run-wordcount.sh ~/run-wordcount.sh
RUN chmod 600 ~/.ssh/config && \
chmod +x ~/start-hadoop.sh && \
chmod +x ~/run-wordcount.sh && \
chmod +x $HADOOP_HOME/sbin/start-dfs.sh && \
chmod +x $HADOOP_HOME/sbin/start-yarn.sh
# 格式化namenode
RUN mkdir -p ~/hdfs/namenode && \
mkdir -p ~/hdfs/datanode && \
mkdir $HADOOP_HOME/logs
RUN $HADOOP_HOME/bin/hdfs namenode -format
# 启动容器后开启ssh服务
CMD [ "sh", "-c", "systemctl start sshd; bash"]
start-container.sh
#!/bin/bash
# 默认节点数3个(即一个master,两个slave)
N=${1:-3}
# 开启Hadoop-Master容器
sudo docker rm -f hadoop-master &> /dev/null
echo "start hadoop-master container..."
sudo docker run -itd \
--privileged -e "container=docker" -v /sys/fs/cgroup:/sys/fs/cgroup \
--net=hadoop \
-p 50070:50070 \
-p 8088:8088 \
--name hadoop-master \
--hostname hadoop-master \
hadoop-docker &> /dev/null \
/usr/sbin/init
# 开启Hadoop-Slave容器
i=1
while [ $i -lt $N ]
do
sudo docker rm -f hadoop-slave$i &> /dev/null
echo "start hadoop-slave$i container..."
sudo docker run -itd \
--privileged -e "container=docker" -v /sys/fs/cgroup:/sys/fs/cgroup \
--net=hadoop \
--name hadoop-slave$i \
--hostname hadoop-slave$i \
hadoop-docker &> /dev/null \
/usr/sbin/init
i=$(( $i + 1 ))
done
# 进入Hadoop-Master容器的命令行
sudo docker exec -it hadoop-master bash
stop-container.sh
增加了一个关闭全部主从节点容器的脚本。
#!/bin/bash
# 默认节点数3个(即一个master,两个slave)
N=${1:-3}
# 关闭Hadoop-Master容器
sudo docker container stop hadoop-master
echo "stop hadoop-master container..."
# 开启Hadoop-Slave容器
i=1
while [ $i -lt $N ]
do
echo "stop hadoop-slave$i container..."
sudo docker container stop hadoop-slave$i
i=$(( $i+1 ))
done
remove-container.sh
Docker失败过程中会生成一些none镜像,而且因为有依赖所以清除起来比较麻烦,这里是在网上搜集的清除方法写成单独的脚本,堪称强迫症患者的福音!
#!/bin/bash
# 默认为none镜像
name=${1:-none}
# 删除容器镜像
docker ps -a | grep "Exited" | awk '{print $1 }' |xargs docker stop
docker ps -a | grep "Exited" | awk '{print $1 }' |xargs docker rm
docker images| grep $name | awk '{print $3 }' |xargs docker rmi
resize-cluster.sh
重新设置从节点数量并重构镜像的脚本。
#!/bin/bash
# N is the node number of hadoop cluster
N=$1
if [ $# = 0 ]
then
echo "Please specify the node number of hadoop cluster!"
exit 1
fi
# change slaves file
i=1
rm config/slaves
while [ $i -lt $N ]
do
echo "hadoop-slave$i" >> config/slaves
((i++))
done
echo -e "\nrebuild docker hadoop image!\n"
# rebuild hadoop image
sudo docker build -t hadoop-docker .
# clear none image
./remove-container.sh
附:命令行纯净版
[xxx@localhost ~]$ mkdir -p hadoop-docker/config
[xxx@localhost ~]$ cd hadoop-docker
[xxx@localhost hadoop-docker]$ touch Dockerfile start-container.sh config/ssh_config config/start-hadoop.sh config/run-wordcount.sh
[xxx@localhost hadoop-docker]$ export version=2.7.3
[xxx@localhost hadoop-docker]$ cp ../hadoop-src/hadoop-$version-src/hadoop-dist/target/hadoop-$version.tar.gz hadoop-$version.tar.gz
[xxx@localhost hadoop-docker]$ tar -xzvf hadoop-$version.tar.gz
[xxx@localhost hadoop-docker]$ copy hadoop-$version/etc/hadoop/core-site.xml config/core-site.xml
[xxx@localhost hadoop-docker]$ copy hadoop-$version/etc/hadoop/hadoop-env.sh config/hadoop-env.sh
[xxx@localhost hadoop-docker]$ copy hadoop-$version/etc/hadoop/hdfs-site.xml config/hdfs-site.xml
[xxx@localhost hadoop-docker]$ copy hadoop-$version/etc/hadoop/mapred-site.xml.template config/mapred-site.xml
[xxx@localhost hadoop-docker]$ copy hadoop-$version/etc/hadoop/yarn-site.xml config/yarn-site.xml
[xxx@localhost hadoop-docker]$ vi config/core-site.xml
fs.defaultFS
hdfs://hadoop-master:9000/
~
~
~
[xxx@localhost hadoop-docker]$ vi config/hadoop-env.sh
# 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=/usr/lib/jvm/jre-1.7.0-openjdk
# 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
~
~
~
[xxx@localhost hadoop-docker]$ vi config/hdfs-site.xml
dfs.namenode.name.dir
file:///root/hdfs/namenode
NameNode directory for namespace and transaction logs storage.
dfs.datanode.data.dir
file:///root/hdfs/datanode
DataNode directory
dfs.replication
2
~
~
~
[xxx@localhost hadoop-docker]$ vi config/mapred-site.xml
mapreduce.framework.name
yarn
~
~
~
[xxx@localhost hadoop-docker]$ vi config/run-wordcount.sh
#!/bin/bash
# test the hadoop cluster by running wordcount
# create input files
mkdir input
echo "Hello Docker" >input/file2.txt
echo "Hello Hadoop" >input/file1.txt
# create input directory on HDFS
hadoop fs -mkdir -p input
# put input files to HDFS
hdfs dfs -put ./input/* input
# run wordcount
hadoop jar $HADOOP_HOME/share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.7.3-sources.jar org.apache.hadoop.examples.WordCount input output
# print the input files
echo -e "\ninput file1.txt:"
hdfs dfs -cat input/file1.txt
echo -e "\ninput file2.txt:"
hdfs dfs -cat input/file2.txt
# print the output of wordcount
echo -e "\nwordcount output:"
hdfs dfs -cat output/part-r-00000
~
~
~
[xxx@localhost hadoop-docker]$ vi config/slaves
hadoop-slave1
hadoop-slave2
~
~
~
[xxx@localhost hadoop-docker]$ vi config/ssh_config
Host localhost
StrictHostKeyChecking no
Host 0.0.0.0
StrictHostKeyChecking no
Host hadoop-*
StrictHostKeyChecking no
UserKnownHostsFile=/dev/null
~
~
~
[xxx@localhost hadoop-docker]$ vi config/start-hadoop.sh
#!/bin/bash
echo -e "\n"
$HADOOP_HOME/sbin/start-dfs.sh
echo -e "\n"
$HADOOP_HOME/sbin/start-yarn.sh
echo -e "\n"
~
~
~
[xxx@localhost hadoop-docker]$ vi config/yarn-site.xml
yarn.nodemanager.aux-services
mapreduce_shuffle
yarn.nodemanager.aux-services.mapreduce_shuffle.class
org.apache.hadoop.mapred.ShuffleHandler
yarn.resourcemanager.hostname
hadoop-master
~
~
~
[xxx@localhost hadoop-docker]$ vi Dockerfile
# 镜像来源
FROM centos7-systemd
# 镜像创建者(写入自己的信息)
MAINTAINER "you"
# 指定目录
WORKDIR /root
# 安装软件
RUN yum update -y && \
yum install -y java-1.7.0-openjdk \
openssh-server \
openssh-clients \
which
# 复制Hadoop
ENV HADOOP_VERSION=2.7.3
COPY hadoop-$HADOOP_VERSION.tar.gz /root/hadoop-$HADOOP_VERSION.tar.gz
# 安装
RUN tar -xzvf hadoop-$HADOOP_VERSION.tar.gz && \
mv hadoop-$HADOOP_VERSION /usr/local/hadoop && \
rm hadoop-$HADOOP_VERSION.tar.gz
# 设置环境变量
ENV JAVA_HOME=/usr/lib/jvm/jre-1.7.0-openjdk
ENV HADOOP_HOME=/usr/local/hadoop
ENV PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
ENV HADOOP_LIBEXEC_DIR=$HADOOP_HOME/libexec
# ssh无密码登录
RUN ssh-keygen -t rsa -f ~/.ssh/id_rsa -P '' && \
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
# 复制配置文件及配置权限
COPY config/* /tmp/
RUN mv /tmp/ssh_config ~/.ssh/config && \
mv /tmp/hadoop-env.sh /usr/local/hadoop/etc/hadoop/hadoop-env.sh && \
mv /tmp/hdfs-site.xml $HADOOP_HOME/etc/hadoop/hdfs-site.xml && \
mv /tmp/core-site.xml $HADOOP_HOME/etc/hadoop/core-site.xml && \
mv /tmp/mapred-site.xml $HADOOP_HOME/etc/hadoop/mapred-site.xml && \
mv /tmp/yarn-site.xml $HADOOP_HOME/etc/hadoop/yarn-site.xml && \
mv /tmp/slaves $HADOOP_HOME/etc/hadoop/slaves && \
mv /tmp/start-hadoop.sh ~/start-hadoop.sh && \
mv /tmp/run-wordcount.sh ~/run-wordcount.sh
RUN chmod 600 ~/.ssh/config && \
chmod +x ~/start-hadoop.sh && \
chmod +x ~/run-wordcount.sh && \
chmod +x $HADOOP_HOME/sbin/start-dfs.sh && \
chmod +x $HADOOP_HOME/sbin/start-yarn.sh
# 格式化namenode
RUN mkdir -p ~/hdfs/namenode && \
mkdir -p ~/hdfs/datanode && \
mkdir $HADOOP_HOME/logs
RUN $HADOOP_HOME/bin/hdfs namenode -format
# 启动容器后开启ssh服务
CMD [ "sh", "-c", "systemctl start sshd; bash"]
~
~
~
[xxx@localhost hadoop-docker]$ vi start-container.sh
#!/bin/bash
# 默认节点数3个(即一个master,两个slave)
N=${1:-3}
# 开启Hadoop-Master容器
sudo docker rm -f hadoop-master &> /dev/null
echo "start hadoop-master container..."
sudo docker run -itd \
--privileged -e "container=docker" -v /sys/fs/cgroup:/sys/fs/cgroup \
--net=hadoop \
-p 50070:50070 \
-p 8088:8088 \
--name hadoop-master \
--hostname hadoop-master \
hadoop-docker &> /dev/null \
/usr/sbin/init
# 开启Hadoop-Slave容器
i=1
while [ $i -lt $N ]
do
sudo docker rm -f hadoop-slave$i &> /dev/null
echo "start hadoop-slave$i container..."
sudo docker run -itd \
--privileged -e "container=docker" -v /sys/fs/cgroup:/sys/fs/cgroup \
--net=hadoop \
--name hadoop-slave$i \
--hostname hadoop-slave$i \
hadoop-docker &> /dev/null \
/usr/sbin/init
i=$(( $i + 1 ))
done
# 进入Hadoop-Master容器的命令行
sudo docker exec -it hadoop-master bash
~
~
~
[xxx@localhost hadoop-docker]$ sudo docker build -t hadoop-docker .
[xxx@localhost hadoop-docker]$ ./start-container.sh
@hadoop-master[root@hadoop-master ~]# ./start-hadoop.sh
@hadoop-master[root@hadoop-master ~]# ./run-wordcount.sh
@hadoop-master[root@hadoop-master ~]# exit