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How to Configure /Etc/Hosts In Vagrant Guest?

5 minutes read

To configure the /etc/hosts file in a Vagrant guest, you can open the Vagrantfile and add a configuration to update the hosts file during provisioning. This can be done by using the Vagrant.configure method and the config.vm.provision block.


Within the provision block, you can use a shell provisioner to execute a command that appends entries to the /etc/hosts file. For example, you can use the echo command to append a new entry for a specific IP address and hostname.


After adding the configuration to the Vagrantfile, you can run vagrant reload to apply the changes to the guest machine. This will update the /etc/hosts file with the new entries that you specified in the Vagrantfile.


By configuring the /etc/hosts file in Vagrant, you can easily manage hostnames and IP addresses for your development environment, making it easier to access different services and resources within the guest machine.


What is the significance of the domain name system (DNS) in relation to the "/etc/hosts" file in a Vagrant guest?

The Domain Name System (DNS) is a system that translates domain names (e.g., www.example.com) into IP addresses that can be used by computers to communicate over the internet. On the other hand, the "/etc/hosts" file is a local configuration file on a computer that maps domain names to IP addresses manually.


In the context of a Vagrant guest, the "/etc/hosts" file is used to manually map domain names to IP addresses before the DNS lookup is performed. This can be useful for testing or development purposes when you want to override public DNS entries with custom mappings.


The significance of the "/etc/hosts" file in relation to DNS in a Vagrant guest is that it allows you to control the domain-to-IP mapping locally without relying on external DNS servers. This can be particularly useful when testing applications or systems in isolated environments where you may not have access to a DNS server or want to avoid unnecessary external requests.


What is the format for specifying an IP address and hostname in the "/etc/hosts" file in a Vagrant guest?

The format for specifying an IP address and hostname in the "/etc/hosts" file in a Vagrant guest is as follows:


[IP address] [hostname]


For example: 192.168.33.10 vagrant-host 192.168.33.11 other-host


How to resolve hostname to IP address using the "/etc/hosts" file in a Vagrant guest?

To resolve a hostname to an IP address using the "/etc/hosts" file in a Vagrant guest, you can follow these steps:

  1. SSH into your Vagrant guest using the following command: vagrant ssh
  2. Edit the "/etc/hosts" file using a text editor like nano or vi. For example, you can use nano by running the following command: sudo nano /etc/hosts
  3. Add a new line at the end of the file in the following format: Replace with the IP address you want to assign to the hostname and with the hostname you want to resolve.
  4. Save the file and exit the text editor.
  5. Test the hostname resolution by pinging the hostname. For example, if you added the line "192.168.33.10 example-host" to the "/etc/hosts" file, you can ping the hostname by running the following command: ping example-host


The hostname should now resolve to the assigned IP address specified in the "/etc/hosts" file.


How to specify a custom alias for an IP address in the "/etc/hosts" file in a Vagrant guest?

To specify a custom alias for an IP address in the "/etc/hosts" file in a Vagrant guest, you can follow these steps:

  1. SSH into your Vagrant guest by running the following command from your host machine:
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vagrant ssh


  1. Once you are logged into the guest machine, open the "/etc/hosts" file using a text editor. You can use nano, vi, or any other text editor of your choice:
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sudo nano /etc/hosts


  1. In the "/etc/hosts" file, add a new line specifying the IP address followed by the custom alias you want to assign to it. For example, if you want to assign the alias "mycustomalias" to the IP address "192.168.33.10", you would add the following line:
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192.168.33.10 mycustomalias


  1. Save the changes and exit the text editor.
  2. Test the new alias by pinging it from the guest machine: 
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ping mycustomalias


You should see that the custom alias now resolves to the specified IP address.


How to comment out an entry in the "/etc/hosts" file in a Vagrant guest?

To comment out an entry in the "/etc/hosts" file in a Vagrant guest, you can use the following steps:

  1. SSH into your Vagrant guest by running the following command in your terminal:
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vagrant ssh


  1. Open the "/etc/hosts" file in a text editor, such as nano, by running the following command:
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sudo nano /etc/hosts


  1. Locate the entry that you want to comment out in the "/etc/hosts" file.
  2. Add a "#" at the beginning of the line containing the entry you want to comment out. This will turn the line into a comment and it will no longer be used by the system.
  3. Save the changes and exit the text editor.
  4. To apply the changes, you may need to restart the networking service by running the following command: 
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sudo systemctl restart networking


After following these steps, the entry in the "/etc/hosts" file will be commented out and will no longer be used by the system.


How to block a website by adding an entry to the "/etc/hosts" file in a Vagrant guest?

To block a website by adding an entry to the "/etc/hosts" file in a Vagrant guest, follow these steps:

  1. Open your terminal and navigate to the directory containing your Vagrantfile.
  2. Start the Vagrant guest by running the command vagrant up.
  3. SSH into the Vagrant guest by running the command vagrant ssh.
  4. Once inside the Vagrant guest, edit the "/etc/hosts" file by running the command sudo nano /etc/hosts.
  5. Add a new entry to block a website by appending the following line to the file: 127.0.0.1 example.com Replace "example.com" with the URL of the website you want to block.
  6. Save the changes to the "/etc/hosts" file and exit the text editor.
  7. Exit the SSH session by running the command exit.
  8. Reload the Vagrant guest to apply the changes to the "/etc/hosts" file by running the command vagrant reload.


After following these steps, the website specified in the "/etc/hosts" file should now be blocked on the Vagrant guest.

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