How to modify the hostname ( hadoop to kalyan)
1. Open /etc/hostname file using below command
sudo gedit /etc/hostname
2. Modify the /etc/hostname file with new hostname
update hadoop to kalyan
3. Save the /etc/hostname file
4. Open /etc/hosts file using below command
sudo gedit /etc/hosts
5. Modify the /etc/hosts file with new hostname
update hadoop to kalyan
127.0.0.1 localhost
127.0.0.1 kalyan
6. Save the /etc/hosts file
7. Execute below command to reflect the hostname changes
sudo service hostname restart
8. Re-Open the Terminal
9. Verify the new hostname using below command
hostname
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