Configuring init to Start Hadoop System Services
init(8) starts some daemons when the system is booted. Depending on the distribution, init executes scripts from either the /etc/init.d directory or the /etc/rc2.d directory. The CDH packages link the files in init.d and rc2.d so that modifying one set of files automatically updates the other.
To start system services at boot time and on restarts, enable their init scripts on the systems on which the services will run, using the appropriate tool:
- chkconfig is included in the RHEL and CentOS distributions. Debian and Ubuntu users can install the chkconfig package.
- update-rc.d is included in the Debian and Ubuntu distributions.
Configuring init to Start Core Hadoop System Services in an MRv1 Cluster
The chkconfig commands to use are:
$ sudo chkconfig hadoop-hdfs-namenode on
The update-rc.d commands to use on Ubuntu and Debian systems are:
|
Where |
Command |
|---|---|
|
On the NameNode |
$ sudo update-rc.d hadoop-hdfs-namenode defaults |
|
On the JobTracker |
$ sudo update-rc.d hadoop-0.20-mapreduce-jobtracker defaults |
|
On the Secondary NameNode (if used) |
$ sudo update-rc.d hadoop-hdfs-secondarynamenode defaults |
|
On each TaskTracker |
$ sudo update-rc.d hadoop-0.20-mapreduce-tasktracker defaults |
|
On each DataNode |
$ sudo update-rc.d hadoop-hdfs-datanode defaults |
Configuring init to Start Core Hadoop System Services in a YARN Cluster
The chkconfig commands to use are:
|
Where |
Command |
|---|---|
|
On the NameNode |
$ sudo chkconfig hadoop-hdfs-namenode on |
|
On the ResourceManager |
$ sudo chkconfig hadoop-yarn-resourcemanager on |
|
On the Secondary NameNode (if used) |
$ sudo chkconfig hadoop-hdfs-secondarynamenode on |
|
On each NodeManager |
$ sudo chkconfig hadoop-yarn-nodemanager on |
|
On each DataNode |
$ sudo chkconfig hadoop-hdfs-datanode on |
|
On the MapReduce JobHistory host |
$ sudo chkconfig hadoop-mapreduce-historyserver on |
The update-rc.d commands to use on Ubuntu and Debian systems are:
|
Where |
Command |
|---|---|
|
On the NameNode |
$ sudo update-rc.d hadoop-hdfs-namenode defaults |
|
On the ResourceManager |
$ sudo update-rc.d hadoop-yarn-resourcemanager defaults |
|
On the Secondary NameNode (if used) |
$ sudo update-rc.d hadoop-hdfs-secondarynamenode defaults |
|
On each NodeManager |
$ sudo update-rc.d hadoop-yarn-nodemanager defaults |
|
On each DataNode |
$ sudo update-rc.d hadoop-hdfs-datanode defaults |
|
On the MapReduce JobHistory host |
$ sudo update-rc.d hadoop-mapreduce-historyserver defaults |
Configuring init to Start Non-core Hadoop System Services
Non-core Hadoop daemons can also be configured to start at init time using the chkconfig or update-rc.d command.
The chkconfig commands are:
|
Component |
Server |
Command |
|---|---|---|
|
Hue |
Hue server |
$ sudo chkconfig hue on |
|
Oozie |
Oozie server |
$ sudo chkconfig oozie on |
|
HBase |
HBase master |
$ sudo chkconfig hbase-master on |
|
|
On each HBase RegionServer |
$ sudo chkconfig hbase-regionserver on |
|
Hive Metastore |
Hive Metastore server |
$ sudo chkconfig hive-metastore on |
| HiveServer2 | HiveServer2 |
$ sudo chkconfig hive-server2 on |
|
Zookeeper |
Zookeeper server |
$ sudo chkconfig zookeeper-server on |
|
HttpFS |
HttpFS server |
$ sudo chkconfig hadoop-httpfs on |
The update-rc.d commands to use on Ubuntu and Debian systems are:
|
Component |
Server |
Command |
|---|---|---|
|
Hue |
Hue server |
$ sudo update-rc.d hue defaults |
|
Oozie |
Oozie server |
$ sudo update-rc.d oozie defaults |
|
HBase |
HBase master |
$ sudo update-rc.d hbase-master defaults |
|
|
HBase RegionServer |
$ sudo update-rc.d hbase-regionserver defaults |
|
Hive Metastore |
Hive Metastore server |
$ sudo update-rc.d hive-metastore defaults |
|
HiveServer2 |
HiveServer2 |
$ sudo update-rc.d hive-server2 defaults |
|
Zookeeper |
Zookeeper server |
$ sudo update-rc.d zookeeper-server defaults |
|
HttpFS |
HttpFS server |
$ sudo update-rc.d hadoop-httpfs defaults |