The host names used by Hadoop need to be set for the master servers, slave servers, development servers, and collaboration servers.
In the hosts file, enter the host names for the NICs to be connected to the public LANs of the servers.
/etc/hosts
Refer to the online manual for information on the hosts file.
Point
Specify strings meeting the following conditions as the host names:
Must contain only lowercase alphanumeric characters
The first character must be a letter
Must be up to 11 characters
The content of the hosts file on the primary master server must match the secondary master server in order to build a master server replicated configuration.
Add the host name information added to the master server to the hosts files of the slave servers, development servers and collaboration servers.
Match the server names with the host names of the master servers, slave servers, and development servers (refer to "5.7 Server Name Settings" for details).
Note
Note the following if registering a local host in the hosts file.
If setting a local host name for "127.0.0.1", it is essential to first enter an IP address that can be referenced remotely. Alternatively, do not set a local host name for "127.0.0.1".
Do not use an alias for the Host name.
Example
Example of IP addresses and host names allocated to the NICs connected to the public LANs of the different servers:
| :10.10.10.11 | :master1 |
| :10.10.10.12 | :master2 |
| :10.10.10.21 to 10.10.10.25 | :slave1 to slave5 |
| :10.10.10.30 | :develop |
| :10.10.10.31 | :collaborate |
Set the hosts file on the master servers as follows:
10.10.10.11 master1 10.10.10.12 master2 127.0.0.1 localhost.localdomain localhost 10.10.10.21 slave1 10.10.10.22 slave2 10.10.10.23 slave3 10.10.10.24 slave4 10.10.10.25 slave5 10.10.10.30 develop 10.10.10.31 collaborate
