1. Starting HDP Services

Start all the Hadoop services in the following order:

HDFS
MapReduce
ZooKeeper
HBase
Hive Metastore
HiveServer2
WebHCat
Oozie
Ganglia
Nagios

Instructions

Start HDFS

Execute these commands on the NameNode host machine:

su -l $HDFS_USER -c "/usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf start namenode"

Execute these commands on the Secondary NameNode host machine:

su -l $HDFS_USER -c "/usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf start secondarynamenode"

Execute these commands on all DataNodes:

su -l $HDFS_USER -c "/usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf start datanode"

where $HDFS_USER is the HDFS Service user. For example, hdfs.

Start MapReduce

Execute these commands on the JobTracker host machine:

su -l $MAPRED_USER -c "/usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf start jobtracker; sleep 25"

Execute these commands on the JobTracker host machine:

su -l $MAPRED_USER -c "/usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf start historyserver"

Execute these commands on all TaskTrackers:

su -l $MAPRED_USER -c "/usr/lib/hadoop/bin/hadoop-daemon.sh --config /etc/hadoop/conf start tasktracker"

where $MAPRED_USER is the MapReduce Service user. For example, mapred.

Start ZooKeeper. On the ZooKeeper host machine, execute the following command:

su - $ZOOKEEPER_USER -c "export  ZOOCFGDIR=/etc/zookeeper/conf ; export ZOOCFG=zoo.cfg ; source /etc/zookeeper/conf/zookeeper-env.sh ; /usr/lib/zookeeper/bin/zkServer.sh start"

where $ZOOKEEPER_USER is the ZooKeeper Service user. For example, zookeeper.

Start HBase

Execute these commands on the HBase Master host machine:

su -l $HBASE_USER -c "/usr/lib/hbase/bin/hbase-daemon.sh --config /etc/hbase/conf start master"

Execute these commands on all RegionServers:

su -l $HBASE_USER -c "/usr/lib/hbase/bin/hbase-daemon.sh --config /etc/hbase/conf start regionserver"

where $HBASE_USER is the HBase Service user. For example, hbase.

Start Hive Metastore. On the Hive Metastore host machine, execute the following command:
```
 su -l $HIVE_USER -c "nohup hive --service metastore > $HIVE_LOG_DIR/hive.out 2> $HIVE_LOG_DIR/hive.log   &"  
```
where:
- $HIVE_USER is the Hive Service user. For example, hive.
- $HIVE_LOG_DIR is the directory where Hive server logs are stored (example:/var/log/hive).
Start HiveServer2. On the Hive Server2 host machine, execute the following command:
```
sudo su $HIVE_USER -c "nohup /usr/lib/hive/bin/hiveserver2 -hiveconf hive.metastore.uris=\" \" > $HIVE_LOG_DIR /hiveServer2.out 2>$HIVE_LOG_DIR/hiveServer2.log &" 
```
This will start both the Hive Metastore and HCatalog services.
- $HIVE_USER is the Hive Service user. For example, hive.
- $HIVE_LOG_DIR is the directory where Hive server logs are stored (example:/var/log/hive).
Start WebHCat. On the WebHCat host machine, execute the following command:
```
su -l $WEBHCAT_USER -c "/usr/lib/hcatalog/sbin/webhcat_server.sh  start"
```
where $WEBHCAT_USER is the WebHCat Service user. For example, hcat.
Start Oozie. On the Oozie server host machine, execute the following command:
```
 sudo su -l $OOZIE_USER -c "cd $OOZIE_LOG_DIR/log; /usr/lib/oozie/bin/oozie-start.sh" 
```
where:
- $OOZIE_USER is the Oozie Service user. For example, oozie
- $OOZIE_LOG_DIR is the directory where Oozie log files are stored (for example: /var/log/oozie).
Start Ganglia.
1. Execute this command on the Ganglia server host machine:
```
/etc/init.d/hdp-gmetad start
```
2. Execute this command on all the nodes in your Hadoop cluster:
```
/etc/init.d/hdp-gmond start
```
Start Nagios.
```
service nagios start
```

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