How to Run Any Specific Command or Script on Linux Startup

1. Using cron:

The cron method is convenient for running commands or scripts at startup. The @reboot directive in the crontab allows you to specify tasks to be run when the system starts.

Open the crontab file

crontab -e

Add the following line:

@reboot /path/to/your/script.sh

Save and exit the editor. This ensures that your script will run each time the system reboots.

2. Using rc.local:

The /etc/rc.local file is traditionally used to run commands at the end of the system boot process.

Open the rc.local file

sudo nano /etc/rc.local

Add your command or script just before the exit 0 line:

/path/to/your/script.sh

Save and exit. Make sure the file is executable:

sudo chmod +x /etc/rc.local

This method may not be available on all distributions, as some are moving away from using rc.local in favor of systemd.

3. Using systemd:

Systemd is a modern init system used by many Linux distributions. You can create a systemd service to execute your script at startup.

Create a new service file, for example, /etc/systemd/system/myscript.service:

[Unit]
Description=My Startup Script

[Service]
ExecStart=/path/to/your/script.sh

[Install]
WantedBy=default.target

Reload systemd and enable/start the service:

sudo systemctl daemon-reload
sudo systemctl enable myscript.service
sudo systemctl start myscript.service

This method provides more control and flexibility and is widely used in modern Linux distributions.

4. Using ~/.bashrc or ~/.bash_profile (for user-specific commands):

If you want a command or script to run when a specific user logs in, you can add it to the ~/.bashrc or ~/.bash_profile file.

Open the .bashrc file

nano ~/.bashrc

Add your command or script at the end of the file:

/path/to/your/script.sh

Save and exit the editor. This method is user-specific and will run the script when the user logs in.

Remember to replace /path/to/your/script.sh with the actual path to your script or command in each case. The appropriate method may vary depending on your distribution and system configuration.

HPE DL380 Gen10 Unboxing | Prepare Server to Install in DATACENTER

Unboxing the HPE DL380 Gen10:

  1. Inspect the Package:
    • Carefully inspect the external packaging for any signs of damage.
    • Ensure that the package includes all the components listed in the packing list.
  2. Open the Box:
    • Use a box cutter or scissors to carefully open the packaging.
  3. Remove Accessories:
    • Take out all the accessories such as power cables, documentation, and any additional components that come with the server.
  4. Inspect the Server:
    • Carefully take the server out of the packaging and inspect it for any physical damage.
    • Ensure that all components, including hard drives, are properly seated.
  5. Documentation:
    • Review the provided documentation, including the quick start guide and any safety information.

1. iLO Configuration:

a. Physical Connection:

  1. Connect to the iLO port on the rear of the server using a network cable.
  2. Ensure the iLO port has an IP address on the same network as your management system.

b. Access iLO Web Interface:

  1. Open a web browser and enter the iLO IP address.
  2. Log in with the default or provided credentials.

c. iLO Configuration:

  1. Change the default password for security.
  2. Configure network settings as needed.
  3. Enable iLO Advanced features if necessary.

1. Accessing Smart Array Configuration Utility:

  1. Power on the Server:
    • Ensure all necessary components, including hard drives, are properly installed.
  2. Access RAID Configuration:
    • During the server boot process, press the designated key (e.g., F8) to access the Smart Array Configuration Utility.

2. Creating a RAID 6 Array:

  1. Select/Create Array:
    • In the Smart Array Configuration Utility, choose an option like “Create Array” or “Manage Arrays.”
  2. Select Drives:
    • Choose the physical drives you want to include in the RAID 6 array. There should be at least four drives for RAID 6.
  3. Configure RAID Level:
    • Select RAID 6 from the available RAID levels.
  4. Set Array Size:
    • Define the size of the RAID array. Keep in mind that RAID 6 requires at least four drives, and usable capacity will be less than the total drive capacity due to the dual parity.
  5. Confirm and Save:
    • Review the configuration and confirm to save the RAID 6 array settings.

3. Installing an Operating System:

  1. Boot from Installation Media:
    • Insert the installation media for your operating system (e.g., Windows Server, Linux) and boot from it.
  2. Select Installation Drive:
    • During the OS installation process, you will be prompted to select the logical drive created by the RAID 6 configuration.
  3. Complete OS Installation:
    • Follow the on-screen instructions to complete the operating system installation.

4. Additional RAID 6 Management:

  1. RAID Monitoring:
    • After the OS is installed, monitor the RAID status through the HPE Smart Storage Administrator or other management tools provided by HPE.
  2. Expand or Modify RAID:
    • If needed, you can later expand the RAID 6 array or modify its configuration through the Smart Storage Administrator.

2. ESXi Installation:

a. Obtain ESXi Installer:

  1. Download the ESXi ISO image from the VMware website.

b. Prepare Boot Media:

  1. Create a bootable USB drive with the ESXi installer using tools like Rufus or UNetbootin.

c. Install ESXi:

  1. Insert the bootable USB drive into the server.
  2. Power on the server and boot from the USB drive.

d. ESXi Installation Wizard:

  1. Follow the on-screen prompts to install ESXi.
  2. Select the installation disk (usually the local storage on your server).

e. Configure ESXi:

  1. Set a password for the ESXi host.
  2. Configure management network settings (IP address, subnet mask, gateway, DNS).

f. Complete Installation:

  1. Allow the ESXi installer to complete the installation process.
  2. Reboot the server.

3. Post-Installation ESXi Configuration:

a. Access ESXi Web Interface:

  1. Open a web browser and enter the ESXi host IP address.
  2. Log in with the credentials you set during installation.

b. Configure Networking:

  1. Verify and configure networking settings as needed.

c. License ESXi:

  1. Apply a license to your ESXi host if required.

d. Create Datastores:

  1. Configure storage settings by creating datastores on your server’s storage.

e. Virtual Machine Management:

  1. Create and manage virtual machines through the ESXi web interface or vSphere Client.

f. Monitor and Manage:

  1. Monitor the ESXi host health, performance, and other settings through the web interface.

4. Additional iLO Integration:

  1. Back in the iLO interface, you can integrate iLO with the ESXi host for enhanced management features.
  2. Configure iLO settings to enable remote console access and other management features.

Setup VoIP Phone System at Home or Office in 4 EASY STEPS | FreePBX and Zoiper Guide

Setting up a VoIP (Voice over Internet Protocol) phone system at home or in an office with FreePBX involves several steps. FreePBX is an open-source PBX (Private Branch Exchange) software that can be used to manage and control VoIP phone calls. Here is a basic guide to help you set up a VoIP phone system using FreePBX:

1. Requirements:

  • A computer or server to host FreePBX (can be a physical machine or a virtual server).
  • A reliable internet connection with sufficient bandwidth for VoIP calls.
  • IP phones or softphones for users to make and receive calls.
  • VoIP service provider for external call routing.

2. Install FreePBX:

  • Download the FreePBX ISO from the official website: https://www.freepbx.org/downloads/
  • Install FreePBX on your chosen hardware or virtual machine following the installation instructions provided on the website.

3. Access FreePBX Web Interface:

  • Once the installation is complete, access the FreePBX web interface using a web browser. The default login credentials are usually:
    • Username: admin
    • Password: admin

4. Configure System Admin Module:

  • In the FreePBX web interface, go to the “Admin” menu and select “System Admin.”
  • Set the time zone, hostname, and other necessary system settings.

5. Configure Extensions:

  • Extensions represent individual phone lines or users in the FreePBX system.
  • Navigate to the “Applications” menu and select “Extensions.” Add extensions for each user or device, specifying the type of device (SIP phone, softphone, etc.).

6. Set Up Trunks:

  • Trunks are used to connect FreePBX to external VoIP providers for making and receiving calls.
  • In the FreePBX web interface, go to the “Connectivity” menu and select “Trunks.” Configure trunks with the details provided by your VoIP service provider.

7. Create Inbound and Outbound Routes:

  • Inbound routes determine how incoming calls are handled, and outbound routes determine the path for outgoing calls.
  • Navigate to the “Connectivity” menu and select “Inbound Routes” and “Outbound Routes.” Configure routes based on your requirements.

8. Set Up IVR (Interactive Voice Response):

  • If needed, create an IVR to provide callers with menu options for call routing.
  • In the FreePBX web interface, go to the “Applications” menu and select “IVR.”

9. Configure Voicemail:

  • Set up voicemail boxes for users who need voicemail services.
  • In the FreePBX web interface, go to the “Applications” menu and select “Voicemail.”

10. Test the System:

  • Once everything is configured, test the system by making internal and external calls to ensure that the setup is working as expected.

11. Security Considerations:

  • Implement security measures such as firewall rules, strong passwords, and regular system updates to protect your VoIP system.

Remember to consult the documentation provided by FreePBX and your VoIP service provider for specific configuration details and troubleshooting tips. Additionally, configuring a VoIP system may require a good understanding of networking concepts and VoIP protocols, so be prepared to address any technical challenges that may arise.