Make NEBULA_IP setting more obvious, hopefully

docker-compose.yaml

@@ -13,4 +13,4 @@ services:
       - /dev/net/tun
     environment:
       - TZ=Europe/London
-      # - NEBULA_IP=10.10.100.x/24
+      - NEBULA_IP=10.10.100.x/24

docker-entrypoint.sh

@@ -5,11 +5,6 @@ BIN_DIR=/app/linux-${ARCH}
 DATA_DIR=/etc/nebula
 HOSTNAME=$(hostname)
 
-if test -z "${NEBULA_IP}"; then
-    echo 'You did not set a value for the environment variable NEBULA_IP'
-    exit 1
-fi
-
 if test "${HOSTNAME}" == '__HOSTNAME__'; then
     echo 'You did not set a hostname for the Docker container'
     exit 2
@@ -33,5 +28,10 @@ if ! test -f ${DATA_DIR}/host.crt; then
 fi
 # -----------------------------------------------------------
 
+if test -z "${NEBULA_IP}" -o "${NEBULA_IP}" == '10.10.100.x/24'; then
+    echo 'You did not set a valid value for the environment variable NEBULA_IP'
+    exit 1
+fi
+
 # Run the platform-specific binary
 "${BIN_DIR}/nebula" -config ${DATA_DIR}/config.yaml