This brief tutorial shows students and new users how to edit or modify Ubuntu local hosts file.
When you think of a hosts file, think of it as plain-text file used by the operating systems to map IP addresses to hostname on the local computer. The hosts file has priority over DNS.
When you type a domain name in your browser to go to a website, your computer translates the domain name your typed into an IP address and connect to the server that hosts the website.
While translating the name to IP, the local hosts file is the first file your operating look at. If the IP to domain mapping isn’t included in the host file, then it looks up a DNS server online. This is how the process works.
When you’re dealing with hosts file, the IP address and the domain or hostname should be separated by at least one space or tab. The lines starting with # are comments and are ignored.
When you’re ready to edit Ubuntu local host file, follow the steps below:
Step 1: Open Ubuntu Hosts File
The process of editing Ubuntu hosts file is simple and straightforward. To add an entry or modify the hosts file, simply run the commands below to open the hosts file.
sudo nano /etc/hosts
A similar lines below should appear in the file.
127.0.0.1 localhost 127.0.1.1 ubuntu1804 # The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix .........................
Changes you make to the hosts file take effect immediately. If you want to undo changes to the hosts file, simply open the file and remove the lines you added or precede the line with a # to ignore it.
Step 2: Add Host Records
For example, to add an entry to translate 127.0.0.1 to example.com, open the hosts file and add its entry by scrolling down to the end of the file and add your new entries:
127.0.0.1 localhost 127.0.1.1 ubuntu1804 127.0.0.1 example.com # The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback
Save the file and exit.
As we said above, the changes takes effect immediately. You will be able to example.com in your browser as soon as you save the file.
This is how one add or modify Ubuntu hosts file entry..
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