If you are not using DNS server for connecting to other nodes in the network then chances are you are using the configuration of the /etc/hosts file for node connectivity.
This is especially useful for small sites. In this setup every node of the network keeps its own copy of the hosts file which contains the hostname and IP address in the /etc/hosts file of all the nodes which are part of network.
The structure of the /etc/hosts file is very simple. It consists of basically three columns the IP address, their corresponding hostname and the third column generally stores the short version of the hostname.
For example in a simple network of two nodes node1.oracle.com and node2.oracle.com with IP address 192.9.201.5 and 192.9.201.6 respectively then the /etc/hosts of each node file will look like this:
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
192.9.201.5 node1.oracle.com node1
192.9.201.6 node2.oracle.com node2
In the above file the address 127.0.0.1 is to specify the loopback address for IPv4.
The ::1 is the loopback address for IPv6.
This is especially useful for small sites. In this setup every node of the network keeps its own copy of the hosts file which contains the hostname and IP address in the /etc/hosts file of all the nodes which are part of network.
The structure of the /etc/hosts file is very simple. It consists of basically three columns the IP address, their corresponding hostname and the third column generally stores the short version of the hostname.
For example in a simple network of two nodes node1.oracle.com and node2.oracle.com with IP address 192.9.201.5 and 192.9.201.6 respectively then the /etc/hosts of each node file will look like this:
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
192.9.201.5 node1.oracle.com node1
192.9.201.6 node2.oracle.com node2
In the above file the address 127.0.0.1 is to specify the loopback address for IPv4.
The ::1 is the loopback address for IPv6.
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