diff --git a/Dockerfile b/Dockerfile
index e1c53a83..d6f89cd2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM debian:buster-slim
 
 # default UID and GID
-ENV USER=pi USER_ID=1000 USER_GID=1000
+ENV USER=pi USER_ID=1000 USER_GID=1000 TZ=Europe/London PORT=20211
 
 # Todo, figure out why using a workdir instead of full paths don't work
 # Todo, do we still need all these packages? I can already see sudo which isn't needed
@@ -28,12 +28,11 @@ RUN groupadd --gid "${USER_GID}" "${USER}" && \
 COPY . /home/pi/pialert
 
 # Pi.Alert 
-RUN python /home/pi/pialert/back/pialert.py update_vendors \    
-    && sed -ie 's/= 80/= 20211/g' /etc/lighttpd/lighttpd.conf \
+RUN sed -ie "s|TIMEZONE|${TZ}|g" /home/pi/pialert/install/pialert.cron \
+    && python /home/pi/pialert/back/pialert.py update_vendors \    
+    && sed -ie 's/= 80/= '${PORT}'/g' /etc/lighttpd/lighttpd.conf \
     && (crontab -l 2>/dev/null; cat /home/pi/pialert/install/pialert.cron) | crontab -
 
-EXPOSE 20211
-
 # it's easy for permissions set in Git to be overridden, so doing it manually
 RUN chmod -R a+rxw /home/pi/pialert/
 
diff --git a/docker-compose.yml b/docker-compose.yml
index 81157c91..f629723b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -2,7 +2,7 @@ version: "3"
 services:
   pialert:
     build: .
-    container_name: pialert_dev
+    container_name: pialert
     network_mode: "host"
     restart: always
     volumes:
@@ -10,6 +10,7 @@ services:
       - ${APP_DATA_LOCATION}/pialert/db/pialert.db:/home/pi/pialert/db/pialert.db
       - ${LOGS_LOCATION}/tmp:/home/pi/pialert/log
     environment:
-      - TZ=France/Paris
-      - HOST_USER_ID=1036
+      - TZ=Europe/London
+      - PORT=20211
+      - HOST_USER_ID=1000
       - HOST_USER_GID=1000
diff --git a/dockerfiles/README.md b/dockerfiles/README.md
index df0886d4..b6acbfe6 100644
--- a/dockerfiles/README.md
+++ b/dockerfiles/README.md
@@ -15,8 +15,8 @@ The source :page_facing_up: Dockerfile is available [here](https://github.com/jo
 Network
    - You will have to probably run the container on the host network, e.g: `sudo docker run --rm --net=host jokobsk/pi.alert`
 
-Port 
-   - The container runs on the port `:20211`.
+Default Port 
+   - The app is accessible on the port `:20211`.
 
 > Please note - the cronjob is executed every 1, 5 and 15 minutes so wait that long for all of the scans to run.
 
@@ -34,6 +34,7 @@ Port
    * Automated copy
      The docker image copies the DB once every 30 min to `/home/pi/pialert/config/pialert.db_bak`. If you have a backup already available, make sure you rename this file if you want to keep older backups before starting a new container. To restore the DB run: `cp /home/pi/pialert/config/pialert.db_bak /home/pi/pialert/db/pialert.db`   
 6. The container supports mapping to local User nad Group IDs. Specify the enviroment variables `HOST_USER_ID` and `HOST_USER_GID` if needed.
+7. You can override the port by specifying the `PORT` env variable.
 
 Config examples can be found below.
 
@@ -56,8 +57,9 @@ services:
       - ${APP_DATA_LOCATION}/pialert/db/pialert.db:/home/pi/pialert/db/pialert.db
       - ${LOGS_LOCATION}/:/home/pi/pialert/log
     environment:
-      - TZ=France/Paris
-      - HOST_USER_ID=1036 
+      - TZ=Europe/London
+      - PORT=20211
+      - HOST_USER_ID=1000
       - HOST_USER_GID=1000
 ```
 
diff --git a/dockerfiles/start.sh b/dockerfiles/start.sh
index 01d1674e..3ab58572 100755
--- a/dockerfiles/start.sh
+++ b/dockerfiles/start.sh
@@ -1,8 +1,14 @@
 #!/bin/sh
 /home/pi/pialert/dockerfiles/user-mapping.sh
 
+# if custom variables not set we do not need to do anything
+if [ -n "${TZ}" ]; then  
+  sed -ie "s|Europe/London|${TZ}|g" /home/pi/pialert/install/pialert.cron   
+  crontab < /home/pi/pialert/install/pialert.cron
+fi
+if [ -n "${PORT}" ]; then  
+  sed -ie 's/= 20211/= '${PORT}'/g' /etc/lighttpd/lighttpd.conf 
+fi
 
-#chmod -R 755 /var/www/html/pialert
-#chmod -R o+w /home/pi/pialert/db
 /etc/init.d/lighttpd start
 cron -f
diff --git a/install/pialert.cron b/install/pialert.cron
index ccf434d5..9c479ee3 100644
--- a/install/pialert.cron
+++ b/install/pialert.cron
@@ -7,8 +7,10 @@
 #  Puche 2021        pi.alert.application@gmail.com        GNU GPLv3
 #-------------------------------------------------------------------------------
 
-0 3 * * 1      python /home/pi/pialert/back/pialert.py update_vendors >/home/pi/pialert/log/pialert.vendors.log  2>&1
-*/1 * * * *    python /home/pi/pialert/back/pialert.py internet_IP    >/home/pi/pialert/log/pialert.IP.log       2>&1
-*/5 * * * *    python /home/pi/pialert/back/pialert.py 1              >/home/pi/pialert/log/pialert.1.log        2>&1
-*/15 * * * *   python /home/pi/pialert/back/pialert.py 15             >/home/pi/pialert/log/pialert.15.log       2>&1
-*/30 * * * *    cp /home/pi/pialert/db/pialert.db      /home/pi/pialert/config/pialert.db_bak      
+TZ=TIMEZONE
+
+0 3 * * 1       python /home/pi/pialert/back/pialert.py update_vendors >/home/pi/pialert/log/pialert.vendors.log  2>&1
+*/1 * * * *     python /home/pi/pialert/back/pialert.py internet_IP    >/home/pi/pialert/log/pialert.IP.log       2>&1
+*/5 * * * *     python /home/pi/pialert/back/pialert.py 1              >/home/pi/pialert/log/pialert.1.log        2>&1
+*/15 * * * *    python /home/pi/pialert/back/pialert.py 15             >/home/pi/pialert/log/pialert.15.log       2>&1
+*/30 * * * *    cp     /home/pi/pialert/db/pialert.db                   /home/pi/pialert/config/pialert.db_bak