Clarify KasmVNC startup

Author: ehfd

README.md

@@ -24,7 +24,7 @@ The high-performance NVENC backend for the Selkies-GStreamer WebRTC interface is
 
 There are two web interfaces that may be chosen in this container, the first being the default [Selkies-GStreamer](https://github.com/selkies-project/selkies-gstreamer) WebRTC HTML5 web interface (requires a TURN server or host networking for best performance), and the second being the fallback [KasmVNC](https://github.com/kasmtech/KasmVNC) WebSocket HTML5 web interface. While the KasmVNC interface does not support audio forwarding, it can be useful for troubleshooting the Selkies-GStreamer WebRTC interface or using this container in constrained environments.
 
-The KasmVNC interface can be enabled in place of Selkies-GStreamer by setting `KASMVNC_ENABLE` to `true`. `KASMVNC_THREADS` sets the number of threads KasmVNC should use for frame encoding, defaulting to all threads if not set. When using the KasmVNC interface, environment variables `SELKIES_ENABLE_BASIC_AUTH`, `SELKIES_BASIC_AUTH_USER`, `SELKIES_BASIC_AUTH_PASSWORD`, `SELKIES_ENABLE_RESIZE`, `SELKIES_ENABLE_HTTPS`, `SELKIES_HTTPS_CERT`, and `SELKIES_HTTPS_KEY`, used with Selkies-GStreamer, are also inherited. As with the Selkies-GStreamer WebRTC interface, the KasmVNC interface username and password will also be set to the environment variables `SELKIES_BASIC_AUTH_USER` and `SELKIES_BASIC_AUTH_PASSWORD`, also using `ubuntu` and the environment variable `PASSWD` by default if not set.
+The KasmVNC interface can be enabled in place of Selkies-GStreamer by setting `KASMVNC_ENABLE` to `true`. `KASMVNC_THREADS` sets the number of threads KasmVNC should use for frame encoding, defaulting to all threads if not set. When using the KasmVNC interface, environment variables `SELKIES_ENABLE_BASIC_AUTH`, `SELKIES_BASIC_AUTH_USER`, `SELKIES_BASIC_AUTH_PASSWORD`, `SELKIES_ENABLE_RESIZE`, `SELKIES_ENABLE_HTTPS`, `SELKIES_HTTPS_CERT`, `SELKIES_HTTPS_KEY`, `SELKIES_PORT`, `NGINX_PORT`, and `TURN_EXTERNAL_IP`, used with Selkies-GStreamer, are also inherited. As with the Selkies-GStreamer WebRTC interface, the KasmVNC interface username and password will also be set to the environment variables `SELKIES_BASIC_AUTH_USER` and `SELKIES_BASIC_AUTH_PASSWORD`, also using `ubuntu` and the environment variable `PASSWD` by default if not set.
 
 ### Running with Docker
 

kasmvnc-entrypoint.sh

@@ -32,9 +32,9 @@ yq -i "
 .encoding.rect_encoding_mode.rectangle_compress_threads = ${KASMVNC_THREADS-0} |
 .encoding.max_frame_rate = ${DISPLAY_REFRESH} |
 .network.interface = \"127.0.0.1\" |
-.network.websocket_port = ${SELKIES_PORT:-8081} |
+.network.websocket_port = ${SELKIES_PORT-8081} |
 .network.ssl.require_ssl = $(echo ${SELKIES_ENABLE_HTTPS-false} | tr '[:upper:]' '[:lower:]') |
-.network.udp.public_ip = \"$(dig -4 TXT +short @ns1.google.com o-o.myaddr.l.google.com 2>/dev/null | { read output; if [ -z "$output" ] || echo "$output" | grep -q '^;;'; then exit 1; else echo "$(echo $output | sed 's,\",,g')"; fi } || dig -6 TXT +short @ns1.google.com o-o.myaddr.l.google.com 2>/dev/null | { read output; if [ -z "$output" ] || echo "$output" | grep -q '^;;'; then exit 1; else echo "[$(echo $output | sed 's,\",,g')]"; fi } || hostname -I 2>/dev/null | awk '{print $1; exit}' || echo '127.0.0.1')\"
+.network.udp.public_ip = \"${TURN_EXTERNAL_IP-$(dig -4 TXT +short @ns1.google.com o-o.myaddr.l.google.com 2>/dev/null | { read output; if [ -z "$output" ] || echo "$output" | grep -q '^;;'; then exit 1; else echo "$(echo $output | sed 's,\",,g')"; fi } || dig -6 TXT +short @ns1.google.com o-o.myaddr.l.google.com 2>/dev/null | { read output; if [ -z "$output" ] || echo "$output" | grep -q '^;;'; then exit 1; else echo "[$(echo $output | sed 's,\",,g')]"; fi } || hostname -I 2>/dev/null | awk '{print $1; exit}' || echo '127.0.0.1')}\"
 " ~/.vnc/kasmvnc.yaml
 
 if [ -n "${SELKIES_HTTPS_CERT}" ]; then yq -i ".network.ssl.pem_certificate = \"${SELKIES_HTTPS_CERT-/etc/ssl/certs/ssl-cert-snakeoil.pem}\"" ~/.vnc/kasmvnc.yaml; fi