🔛Starting and Stopping Services

1. Starting Services:

   • sudo service apache2 start:

     • Explanation: Starts the Apache web server service.

     • Example: Running sudo service apache2 start would initiate the Apache web server and make it available for serving web pages.

   • python3 -m http.server 80:

     • Explanation: Starts a simple HTTP server using Python on port 80.

     • Example: Running python3 -m http.server 80 would start a basic HTTP server on port 80, allowing you to serve files from the current directory.

     
2. Stopping Services:

   • sudo service apache2 stop:

     • Explanation: Stops the Apache web server service.

     • Example: Running sudo service apache2 stop would halt the running Apache web server, shutting down any active web page serving.

3. Enabling and Disabling Services on System Boot:

   • sudo systemctl enable ssh:

     • Explanation: Enables the SSH (Secure Shell) service to start automatically on system boot.

     • Example: Running sudo systemctl enable ssh would configure the system to start the SSH service during system startup.

   • sudo systemctl disable ssh:

     • Explanation: Disables the SSH service from starting automatically on system boot.

     • Example: Running sudo systemctl disable ssh would prevent the SSH service from starting automatically during system startup.

4. Checking the Status of Services:

   • sudo service apache2 status:

     • Explanation: Displays the current status of the Apache web server service.

     • Example: Running sudo service apache2 status would show whether the Apache service is running, stopped, or encountering issues.

   • sudo systemctl status ssh:

     • Explanation: Displays the current status of the SSH service.

     • Example: Running sudo systemctl status ssh would provide information about the status of the SSH service, including whether it's active or inactive.

Starting and Stopping Services:

• sudo service apache2 restart:

  • Explanation: Restarts the Apache web server service.

  • Example: Running sudo service apache2 restart would stop and then start the Apache web server, applying any configuration changes.

  
• sudo systemctl start serviceName:

  • Explanation: Starts a service using systemd.

  • Example: Running sudo systemctl start apache2 would start the Apache web server using systemd.

• sudo systemctl stop serviceName:

  • Explanation: Stops a service using systemd.

  • Example: Running sudo systemctl stop apache2 would stop the running Apache web server.

Enabling and Disabling Services:

• sudo service apache2 enable:

  • Explanation: Enables the Apache web server service to start on boot.

  • Example: Running sudo service apache2 enable would configure Apache to start automatically during system startup.

• sudo service apache2 disable:

  • Explanation: Disables the Apache web server service from starting on boot.

  • Example: Running sudo service apache2 disable would prevent Apache from starting automatically during system startup.

• sudo systemctl is-enabled serviceName:

  • Explanation: Checks if a service is enabled to start on boot using systemd.

  • Example: Running sudo systemctl is-enabled apache2 would indicate whether Apache is set to start on boot.

Checking Service Logs:

• journalctl -u serviceName:

  • Explanation: Displays the logs for a specific service.

  • Example: Running journalctl -u apache2 would show logs related to the Apache web server.

Reloading Service Configuration:

• sudo systemctl reload serviceName:

  • Explanation: Reloads the configuration of a running service without stopping it.

  • Example: Running sudo systemctl reload apache2 would reload the configuration of the Apache web server.