47 lines
1.7 KiB
Markdown
47 lines
1.7 KiB
Markdown
# Changes
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Version 2.0.0 introduces uses wait_for_it script for the cluster startup
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# Hadoop Docker
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To deploy an example HDFS cluster, run:
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```
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docker-compose up
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```
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Or deploy in swarm:
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```
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docker stack deploy -c docker-compose-v3.yml hadoop
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```
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The configuration parameters can be specified in the hadoop.env file or as environmental variables for specific services (e.g. namenode, datanode etc.):
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```
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CORE_CONF_fs_defaultFS=hdfs://namenode:8020
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```
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CORE_CONF corresponds to core-site.xml. fs_defaultFS=hdfs://namenode:8020 will be transformed into:
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```
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<property><name>fs.defaultFS</name><value>hdfs://namenode:8020</value></property>
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```
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To define dash inside a configuration parameter, use double underscore, such as YARN_CONF_yarn_log___aggregation___enable=true (yarn-site.xml):
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```
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<property><name>yarn.log-aggregation-enable</name><value>true</value></property>
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```
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The available configurations are:
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* /etc/hadoop/core-site.xml CORE_CONF
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* /etc/hadoop/hdfs-site.xml HDFS_CONF
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* /etc/hadoop/yarn-site.xml YARN_CONF
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* /etc/hadoop/httpfs-site.xml HTTPFS_CONF
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* /etc/hadoop/kms-site.xml KMS_CONF
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* /etc/hadoop/mapred-site.xml MAPRED_CONF
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If you need to extend some other configuration file, refer to base/entrypoint.sh bash script.
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After starting the example Hadoop cluster, you should be able to access interfaces of all the components (substitute domain names by IP addresses from ```network inspect dockerhadoop_default``` command):
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* Namenode: http://namenode:50070/dfshealth.html#tab-overview
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* History server: http://historyserver:8188/applicationhistory
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* Datanode: http://datanode:50075/
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* Nodemanager: http://nodemanager:8042/node
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* Resource manager: http://resourcemanager:8088/
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