通过简答脚本同时操作多个虚拟机

通常我们会用Ansible或类似的自动化工具来维护和管理多个虚拟机，但如果我们对多个虚拟机的操作是一次性的，不想安装Ansible，可以使用下面的简单的脚本，在远程虚拟机上无限执行命令。

#!/bin/bash

# 1. Check if sshpass is installed
if ! command -v sshpass &> /dev/null; then
    echo "Error: sshpass command not found. Please install it (e.g., sudo apt install sshpass)"
    exit 1
fi

# Define the list of Virtual Machines
HOSTS=(
  "ubuntu@172.25.255.28"
  "ubuntu@172.25.255.31"
  "ubuntu@172.25.255.90"
)

# 2. Input password once before entering the loop
read -s -p "Please input password (enter once for session): " PASSWORD
echo ""

if [ -z "$PASSWORD" ]; then
    echo "Error: Password cannot be empty."
    exit 1
fi

# 3. Start the infinite loop for continuous execution
while true; do
    echo "----------------------------------------"
    echo "Available hosts: ${#HOSTS[@]}"
    read -p "Please input the command (type 'exit' to quit): " COMMAND
    
    # Check if user wants to exit the script
    if [ "$COMMAND" == "exit" ] || [ "$COMMAND" == "quit" ]; then
        echo "Exiting script..."
        break
    fi

    # Prevent empty command execution
    if [ -z "$COMMAND" ]; then
        echo "⚠️ Command cannot be empty. Please try again."
        continue
    fi

    echo "" # Empty line for formatting

    # 4. Loop through hosts and execute
    for host in "${HOSTS[@]}"; do
        echo "🚀 Executing on $host: $COMMAND"
        
        # Execute command via SSH
        sshpass -p "$PASSWORD" ssh -o StrictHostKeyChecking=no -o ConnectTimeout=5 "$host" "sudo $COMMAND"
        
        # Check execution result
        if [ $? -eq 0 ]; then
            echo "✅ $host execution successful"
        else
            echo "❌ $host execution failed (check password, network, or host status)"
            # Note: We do not exit here, allowing the loop to continue to the next host
        fi
        echo ""
    done
    
    echo "----------------------------------------"
    echo "Batch execution finished. Ready for next command."
    echo ""
done

# 5. Cleanup and exit
unset PASSWORD
echo "Script terminated safely."