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70 lines
2.6 KiB
Bash
70 lines
2.6 KiB
Bash
#!/bin/bash
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# --- 1. Define Variables and Prompt for Input ---
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# Define the local directory where the kubeconfig file will be stored
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LOCAL_KUBE_DIR="$HOME/.kube"
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# Define the local destination path for the config file
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LOCAL_CONFIG_PATH="$LOCAL_KUBE_DIR/config"
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# Define the remote source file path (standard k3s kubeconfig location)
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REMOTE_CONFIG_PATH="/etc/rancher/k3s/k3s.yaml"
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# Define the remote username
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REMOTE_USER="rancher"
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echo "--- K3s Kubeconfig Fetcher ---"
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# Prompt the user for the K3s server IP address
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read -r -p "Enter the K3s master server IP address: " SERVER_IP
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# Validate that an IP was entered
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if [[ -z "$SERVER_IP" ]]; then
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echo "Error: Server IP address cannot be empty. Exiting."
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exit 1
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fi
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# --- 2. Create Local Directory ---
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# Create the .kube directory if it doesn't exist
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echo "Creating local directory: $LOCAL_KUBE_DIR"
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mkdir -p "$LOCAL_KUBE_DIR"
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# --- 3. Execute SCP for File Download ---
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# The scp command will download the file from the remote server.
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# The user will be prompted for the password by the scp/ssh process.
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echo "Attempting to download kubeconfig from $REMOTE_USER@$SERVER_IP..."
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echo "You will be prompted to enter the password for the user 'rancher'."
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# SCP Syntax: scp [user@]remote_host:source_file local_destination
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sudo scp "$REMOTE_USER@$SERVER_IP:$REMOTE_CONFIG_PATH" "$LOCAL_CONFIG_PATH"
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# Check the exit status of the scp command
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if [ $? -ne 0 ]; then
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echo "---"
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echo "ERROR: File transfer failed. Check the following:"
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echo "* Ensure SSH is running on the server."
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echo "* Verify the IP address and the password for 'rancher' are correct."
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echo "* Ensure 'rancher' user has read permission to $REMOTE_CONFIG_PATH (may require elevated permissions on the server)."
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exit 1
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fi
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echo "SUCCESS: Kubeconfig file downloaded to $LOCAL_CONFIG_PATH"
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# --- 4. Post-Download Configuration Steps ---
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# 4a. Update Server IP in the config file
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# The k3s config often uses 127.0.0.1 internally, which must be replaced with the public IP.
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echo "Updating server IP from 127.0.0.1 to $SERVER_IP in the config file..."
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sudo sed -i "s/127.0.0.1/$SERVER_IP/g" "$LOCAL_CONFIG_PATH"
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# 4b. Set correct permissions (read/write only for the owner)
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echo "Setting restrictive permissions on the config file (chmod 600)..."
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sudo chmod 600 "$LOCAL_CONFIG_PATH"
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# 4c. Set ownership to the current user (since 'sudo scp' might set root ownership)
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echo "Setting file ownership to the current user: $USER"
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sudo chown "$USER":"$(id -gn $USER)" "$LOCAL_CONFIG_PATH"
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echo "---"
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echo "Kubeconfig is ready! You can now use kubectl to manage your cluster."
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echo "Example: kubectl get nodes" |