Create entrypoint.sh

docker/entrypoint.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+set -e
+
+# Check if required environment variables are set
+if [ -z "$SSH_HOST" ] || [ -z "$SSH_USER" ] || [ -z "$REMOTE_PORTS" ] || [ -z "$LOCAL_PORTS" ]; then
+  echo "ERROR: Required variables (SSH_HOST, SSH_USER, REMOTE_PORTS, LOCAL_PORTS) are missing."
+  exit 1
+fi
+
+# Check if the SSH key exists in /tmp/ and copy it to /root/.ssh/
+if [ -f "/tmp/id_rsa" ]; then
+    echo "Copying SSH key to /root/.ssh/id_rsa..."
+    cp /tmp/id_rsa /root/.ssh/id_rsa
+    chmod 600 /root/.ssh/id_rsa
+else
+    echo "ERROR: SSH key is missing. Please mount your private key to /tmp/id_rsa."
+    exit 1
+fi
+
+# Clear logs on container startup
+echo "" > /var/log/ssh-tunnel/tunnel.log
+
+# Generate logrotate config using environment variables
+envsubst < /logrotate.template > /etc/logrotate.d/ssh-tunnel
+
+# Build the SSH tunnel command
+TUNNEL_CMD=""
+LOCAL_PORT_ARRAY=($LOCAL_PORTS)
+REMOTE_PORT_ARRAY=($REMOTE_PORTS)
+
+for i in "${!LOCAL_PORT_ARRAY[@]}"; do
+  TUNNEL_CMD="$TUNNEL_CMD -L ${LOCAL_PORT_ARRAY[$i]}:${REMOTE_PORT_ARRAY[$i]}"
+done
+
+echo "Starting SSH tunnel to $SSH_USER@$SSH_HOST" | tee -a /var/log/ssh-tunnel/tunnel.log
+echo "Configured tunnels:" | tee -a /var/log/ssh-tunnel/tunnel.log
+for i in "${!LOCAL_PORT_ARRAY[@]}"; do
+  echo "- ${LOCAL_PORT_ARRAY[$i]} -> ${REMOTE_PORT_ARRAY[$i]}" | tee -a /var/log/ssh-tunnel/tunnel.log
+done
+
+# Start autossh to maintain the tunnel (disables host key checking)
+exec autossh -M 0 \
+  -o "StrictHostKeyChecking=no" \
+  -o "UserKnownHostsFile=/dev/null" \
+  -o "ServerAliveInterval=60" \
+  -o "ServerAliveCountMax=3" \
+  -N $TUNNEL_CMD $SSH_USER@$SSH_HOST 2>&1 | tee -a /var/log/ssh-tunnel/tunnel.log