##Run Hadoop Cluster within Docker Containers

• Blog: Run Hadoop Cluster in Docker Update

###3 Nodes Hadoop Cluster

#####1. pull docker image

sudo docker pull oelesin/hadoop-spark-cluster:latest

#####2. clone github repository

git clone https://github.com/oelesin/hadoop-cluster-docker

#####3. create hadoop network

sudo docker network create --driver=bridge hadoop

#####4. create hdfs mount directory on Docker Host machine

sudo mkdir /data/hadoop_docker
sudo chmod -R 777 /data/hadoop_docker

The step above ensures that your hadoop data is persisted on the host machine. Hence, data is no longer lost when you shutdown the docker images

#####5. start container

cd hadoop-cluster-docker
sudo ./start-container.sh

output:

start hadoop-master container...
start hadoop-slave1 container...
start hadoop-slave2 container...
root@hadoop-master:~#

• start 3 containers with 1 master and 2 slaves
• you will get into the /root directory of hadoop-master container

#####6. start hadoop

./start-hadoop.sh

#####7. run wordcount

./run-wordcount.sh

output

input file1.txt:
Hello Hadoop

input file2.txt:
Hello Docker

wordcount output:
Docker    1
Hadoop    1
Hello    2

###Arbitrary size Hadoop cluster

#####1. pull docker images and clone github repository

do 1~3 like section A

#####2. rebuild docker image

sudo ./resize-cluster.sh 5

• specify parameter > 1: 2, 3..
• this script just rebuild hadoop image with different slaves file, which pecifies the name of all slave nodes

#####3. start container

sudo ./start-container.sh 5

• use the same parameter as the step 2

#####4. run hadoop cluster

do 5~6 like section A