Rahul Sahu

Here’s how you can list the available VM images in LXD (Linux Containers): Open a terminal and log in to your Linux system. Launch the LXD client using the following command: lxc launch ubuntu: Use the following command to list the available VM images: lxc image list images: The output of this command will show … Read more

Here’s how you can clear or flush the DNS cache on Google Chrome: Open Google Chrome and enter chrome://net-internals/#dns into the address bar. Click on the “Clear host cache” button under the “DNS” section. Wait for the message “DNS cache cleared” to appear. Your DNS cache in Google Chrome should now be cleared and any … Read more

Here’s how you can disable the SSH Message of the Day (MOTD) welcome message on Ubuntu Linux: Open a terminal and log in to your Ubuntu Linux system. Create a new file in the /etc/pam.d directory using the following command: sudo nano /etc/pam.d/sshd Add the following line to the file: session optional pam_motd.so Save the … Read more

Here’s how you can install the Nginx web server on Alpine Linux: Open a terminal and log in to your Alpine Linux system. Update the package index: apk update Install Nginx using the following command: apk add nginx Start the Nginx service using the following command: rc-service nginx start Enable Nginx to start automatically at … Read more

Here’s how you can count the total number of word occurrences using grep on Linux or Unix: Open a terminal and navigate to the directory containing the file you want to search. Use the following command to count the total number of occurrences of a word: grep -o -w “<word>” <file> | wc -l Replace … Read more

Here’s how you can upload an SSH public key as an authorized_key using Ansible: Create a new playbook in Ansible: nano upload_key.yml Add the following content to the playbook to upload an SSH public key: – name: Upload SSH public key hosts: <host_group> become: yes become_user: <username> tasks: – name: Create authorized_keys file authorized_key: user: … Read more

Here’s how you can append text to a file when using the sudo command on Linux or Unix: Open a terminal and navigate to the directory containing the file you want to append text to. Use the following command to open the file with the sudo privilege: sudo nano /path/to/file Replace /path/to/file with the path … Read more

Here’s how you can extract multiple tar.gz files in a directory on Linux or Unix: Navigate to the directory containing the tar.gz files: cd /path/to/directory Use the following command to extract all tar.gz files in the directory: for i in *.tar.gz; do tar xvf “$i”; done This command will extract each tar.gz file in the … Read more

Here’s how you can configure Nginx to perform SSL/TLS passthrough with TCP load balancing: Install Nginx: sudo apt-get update sudo apt-get install nginx Create a new Nginx configuration file in the sites-available directory: sudo nano /etc/nginx/sites-available/<your_site> Replace <your_site> with the desired name for your site. Add the following content to the file to configure Nginx … Read more

Here’s how you can install tinc VPN on Ubuntu Linux 16.04 LTS: Update your system: sudo apt-get update sudo apt-get upgrade Install tinc VPN: sudo apt-get install tinc Create a tinc network: sudo mkdir /etc/tinc/<network_name> sudo tincd -n <network_name> -K Replace <network_name> with the desired name for your tinc network. Create a configuration file for … Read more