druid-docs-cn/tutorials/tutorial-kerberos-hadoop.md

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---
id: tutorial-kerberos-hadoop
title: "Configuring Apache Druid to use Kerberized Apache Hadoop as deep storage"
sidebar_label: "Kerberized HDFS deep storage"
---
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## Hadoop Setup
Following are the configurations files required to be copied over to Druid conf folders:
1. For HDFS as a deep storage, hdfs-site.xml, core-site.xml
2. For ingestion, mapred-site.xml, yarn-site.xml
### HDFS Folders and permissions
1. Choose any folder name for the druid deep storage, for example 'druid'
2. Create the folder in hdfs under the required parent folder. For example,
`hdfs dfs -mkdir /druid`
OR
`hdfs dfs -mkdir /apps/druid`
3. Give druid processes appropriate permissions for the druid processes to access this folder. This would ensure that druid is able to create necessary folders like data and indexing_log in HDFS.
For example, if druid processes run as user 'root', then
`hdfs dfs -chown root:root /apps/druid`
OR
`hdfs dfs -chmod 777 /apps/druid`
Druid creates necessary sub-folders to store data and index under this newly created folder.
## Druid Setup
Edit common.runtime.properties at conf/druid/_common/common.runtime.properties to include the HDFS properties. Folders used for the location are same as the ones used for example above.
### common.runtime.properties
```properties
# Deep storage
#
# For HDFS:
druid.storage.type=hdfs
druid.storage.storageDirectory=/druid/segments
# OR
# druid.storage.storageDirectory=/apps/druid/segments
#
# Indexing service logs
#
# For HDFS:
druid.indexer.logs.type=hdfs
druid.indexer.logs.directory=/druid/indexing-logs
# OR
# druid.storage.storageDirectory=/apps/druid/indexing-logs
```
Note: Comment out Local storage and S3 Storage parameters in the file
Also include hdfs-storage core extension to `conf/druid/_common/common.runtime.properties`
```properties
#
# Extensions
#
druid.extensions.directory=dist/druid/extensions
druid.extensions.hadoopDependenciesDir=dist/druid/hadoop-dependencies
druid.extensions.loadList=["mysql-metadata-storage", "druid-hdfs-storage", "druid-kerberos"]
```
### Hadoop Jars
Ensure that Druid has necessary jars to support the Hadoop version.
Find the hadoop version using command, `hadoop version`
In case there is other software used with hadoop, like `WanDisco`, ensure that
1. the necessary libraries are available
2. add the requisite extensions to `druid.extensions.loadlist` in `conf/druid/_common/common.runtime.properties`
### Kerberos setup
Create a headless keytab which would have access to the druid data and index.
Edit conf/druid/_common/common.runtime.properties and add the following properties:
```properties
druid.hadoop.security.kerberos.principal
druid.hadoop.security.kerberos.keytab
```
For example
```properties
druid.hadoop.security.kerberos.principal=hdfs-test@EXAMPLE.IO
druid.hadoop.security.kerberos.keytab=/etc/security/keytabs/hdfs.headless.keytab
```
### Restart Druid Services
With the above changes, restart Druid. This would ensure that Druid works with Kerberized Hadoop