setup_vm_to_vm_ssh.sh

#!/bin/bash

# Setup SSH keys between VMs for Unison to work

# Load configuration
if [ -f "config.env" ]; then
    source config.env
else
    echo "Error: config.env file not found. Please copy config.env.example to config.env and update with your values."
    exit 1
fi

echo "=== Setting up VM-to-VM SSH keys for Unison ==="
echo ""

# Generate SSH key on VM1 and copy to VM2
echo "Setting up SSH key from VM1 to VM2..."
ssh -o StrictHostKeyChecking=no $VM_USER@$VM1_IP << EOF
    # Generate SSH key on VM1 if it doesn't exist
    if [ ! -f $SSH_KEY_PATH ]; then
        ssh-keygen -t rsa -b 2048 -f $SSH_KEY_PATH -N ""
    fi
    
    # Show the public key
    echo "VM1 public key:"
    cat $SSH_KEY_PATH.pub
EOF

echo ""
echo "Now copying VM1's public key to VM2..."

# Get VM1's public key and add it to VM2's authorized_keys
VM1_PUBKEY=$(ssh -o StrictHostKeyChecking=no $VM_USER@$VM1_IP "cat $SSH_KEY_PATH.pub")

ssh -o StrictHostKeyChecking=no $VM_USER@$VM2_IP << EOF
    # Create .ssh directory if it doesn't exist
    mkdir -p ~/.ssh
    chmod 700 ~/.ssh
    
    # Add VM1's public key to authorized_keys
    echo "$VM1_PUBKEY" >> ~/.ssh/authorized_keys
    chmod 600 ~/.ssh/authorized_keys
    
    echo "VM1's public key added to VM2's authorized_keys"
EOF

echo ""
echo "Testing VM1 -> VM2 passwordless SSH..."
ssh -o StrictHostKeyChecking=no $VM_USER@$VM1_IP "ssh -o StrictHostKeyChecking=no $VM_USER@$VM2_IP 'echo VM1 can SSH to VM2 without password'"

echo ""
echo "=== VM-to-VM SSH setup complete! ==="