Run Remote Commands with SSH and Certificate Authentication on Linux / macOS Terminal - Making Sense of the Infinite

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January 28, 2025 Run Remote Commands with SSH and Certificate Authentication on Linux / macOS Terminal

1. Ensure SSH Key-Based Authentication Is Set Up Before proceeding, make sure you have SSH key-based authentication set up between your local machine and the remote server:

Generate SSH Key Pair (if not already done): On your local machine, generate a new SSH key pair (private and public key): ssh-keygen -t rsa -b 4096 -C "[email protected]"ShellScript By default, this creates the keys in ~/.ssh/id_rsa (private key) and ~/.ssh/id_rsa.pub (public key).

2. Copy the Public Key to the Remote Server: Copy the public key (id_rsa.pub) to the remote server’s ~/.ssh/authorized_keys file. You can use ssh-copy-id:

ssh-copy-id -i ~/.ssh/id_rsa.pub user@remote_hostShellScript Or, manually append the public key to the ~/.ssh/authorized_keys file on the remote server.

2. SSH Command to Execute Script Remotely Once SSH key-based authentication is set up, you can log into the server and execute a script remotely by using the following script:

Make sure to replace username, IP Address, and other placeholders with your actual values.

To save the script as a local_execute.sh file locally:

"$LOG_FILE" 2>&1 # Check the exit status if [ $? -eq 0 ]; then echo "Script executed successfully. Exiting..." else echo "Script execution failed. Check the log file for details: $LOG_FILE" fi # Terminate the terminal session echo "Closing terminal session..." exit " style="color:#F8F8F2;display:none" aria-label="Copy" class="code-block-pro-copy-button">#!/bin/bash # Configuration PRIVATE_KEY="/path/to/private_key" # Path to the private key REMOTE_USER="username" # Remote host username REMOTE_HOST="remote_host_or_ip" # Remote host address or IP REMOTE_PORT="22" # SSH port (default is 22, change if necessary) REMOTE_SCRIPT="/path/to/remote_script.sh" # Path to the remote script LOG_FILE="/tmp/remote_execution.log" # Path to the local log file # Connect to the remote host and execute the script echo "Connecting to the remote host on port $REMOTE_PORT and executing the script..." ssh -i "$PRIVATE_KEY" -p "$REMOTE_PORT" "$REMOTE_USER@$REMOTE_HOST" "bash $REMOTE_SCRIPT" > "$LOG_FILE" 2>&1 # Check the exit status if [ $? -eq 0 ]; then echo "Script executed successfully. Exiting..." else echo "Script execution failed. Check the log file for details: $LOG_FILE" fi # Terminate the terminal session echo "Closing terminal session..." exit Bash Make the script executable: After saving the file, you need to give it executable permissions. In the terminal, run:

chmod +x ./local_execute.shShellScript Run the script: To execute the script locally, you can run:

./local_execute.shShellScript This will execute the script on your local machine, which will connect to the remote server via SSH using the provided private key and run the specified script.