Linux Host file entry to verify websites¶
Host file is a system file used by an operating system to map a hostname to an IP-addresses. The host file is a plain text file and is conventionally named hosts.
Once website migration is over, we might need to make sure everything is in place, before flipping DNS. This can be done by adding an entry in our system’s hosts file.
Acess the hostfile location
sudo vim /etc/hosts
Enter the password of your PC, to grant Sudo access.
Press the I key, to enable the insert mode.
Lets add an example host file,
172.16.19.10 example.org www.example.org
127.0.0.1 localhost # The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters 172.16.19.10 example.org www.example.org
After the host file entry is made, press the Esc key and type :wq! and hit the Enter key.
Try the ping command to check if the host file entry made is right.
Ping for www.example.org must point to the Ip address 172.16.19.10
ping www.example.org PING example.org (172.16.19.10) 56(84) bytes of data.
Once we have tested everything, you can flip the DNS. Also, make sure to remove this entry from the host file after testing.