Add 'k3os/download-kubeconfig-from-master.sh'

k3os/download-kubeconfig-from-master.sh

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