diff --git a/README.md b/README.md
index 7bbacd4..3d6e56a 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,7 @@ Open a python shell in the lms or the cms:
 ## TODO
 
 - Make sure that secret keys are not shared with the entire world
+- Don't duplicate args between containers
 - Add arguments to set domain name, platform name, etc.
 - Add documentation on host Nginx
 - Better readme
diff --git a/docker-compose.yml b/docker-compose.yml
index a307509..3971e2f 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -26,7 +26,11 @@ services:
       - ./data/mysql:/var/lib/mysql
 
   nginx:
-    build: ./nginx
+    build:
+      context: ./nginx
+      args:
+          lms_host: learn.overhang.io
+          cms_host: studio.learn.overhang.io
     #restart: on-failure
     ports:
       - "8800:80"
@@ -52,7 +56,10 @@ services:
     build:
       context: ./edxapp
       args:
+        lms_host: learn.overhang.io
+        cms_host: studio.learn.overhang.io
         service_variant: lms
+        secret_key: "12UyBHiBWxcPT1NP4prP5QhHc"
     #restart: on-failure
     volumes:
       - ./data/edxapp:/openedx/data
@@ -67,7 +74,10 @@ services:
     build:
       context: ./edxapp
       args:
+        lms_host: learn.overhang.io
+        cms_host: studio.learn.overhang.io
         service_variant: cms
+        secret_key: "12UyBHiBWxcPT1NP4prP5QhHc"
     #restart: on-failure
     volumes:
       - ./data/edxapp:/openedx/data
@@ -81,7 +91,10 @@ services:
     build:
       context: ./edxapp
       args:
+        lms_host: learn.overhang.io
+        cms_host: studio.learn.overhang.io
         service_variant: lms
+        secret_key: "12UyBHiBWxcPT1NP4prP5QhHc"
     command: ./manage.py lms --settings=production celery worker --loglevel=info --hostname=edx.lms.core.default.%%h --maxtasksperchild 100
     environment:
       C_FORCE_ROOT: "1" # run celery tasks as root #nofear
diff --git a/edxapp/Dockerfile b/edxapp/Dockerfile
index 2f96345..b1d1363 100644
--- a/edxapp/Dockerfile
+++ b/edxapp/Dockerfile
@@ -34,22 +34,35 @@ RUN pip install -r requirements/edx/local.txt
 RUN pip install -r requirements/edx/base.txt
 RUN pip install -r requirements/edx/post.txt
 RUN pip install -r requirements/edx/paver.txt
+# TODO install ced from pip
+RUN curl https://raw.githubusercontent.com/regisb/ced/v0.2/ced/ced > /usr/local/bin/ced
+RUN chmod a+x /usr/local/bin/ced
 
 # Finish requirements install
 RUN paver install_prereqs
 
-# Copy configuration files
-COPY ./config/lms.env.json /openedx/
-COPY ./config/cms.env.json /openedx/
-COPY ./config/lms.auth.json /openedx/
-COPY ./config/cms.auth.json /openedx/
-COPY ./config/production_lms.py /openedx/edx-platform/lms/envs/production.py
-COPY ./config/production_cms.py /openedx/edx-platform/cms/envs/production.py
-
-############ End of code common to lms & cms
-
+ARG lms_host=localhost:8000
+ARG cms_host=localhost:8000
+ARG platform_name="My Ginkgo Open edX"
 # service variang is "lms" or "cms"
 ARG service_variant
+ARG secret_key
+
+# Generate configuration files
+ENV LMS_HOST=$lms_host CMS_HOST=$cms_host PLATFORM_NAME=$platform_name SECRET_KEY=$secret_key
+COPY ./config/production_lms.py /openedx/edx-platform/lms/envs/production.py
+COPY ./config/production_cms.py /openedx/edx-platform/cms/envs/production.py
+COPY ./config/lms.env.json.templ /openedx/
+COPY ./config/cms.env.json.templ /openedx/
+COPY ./config/lms.auth.json.templ /openedx/
+COPY ./config/cms.auth.json.templ /openedx/
+RUN ced /openedx/lms.env.json.templ -o /openedx/lms.env.json
+RUN ced /openedx/cms.env.json.templ -o /openedx/cms.env.json
+RUN ced /openedx/lms.auth.json.templ -o /openedx/lms.auth.json
+RUN ced /openedx/cms.auth.json.templ -o /openedx/cms.auth.json
+
+
+############ End of code common to lms & cms
 
 # Configure environment
 ENV DJANGO_SETTINGS_MODULE ${service_variant}.envs.production
diff --git a/edxapp/config/cms.auth.json b/edxapp/config/cms.auth.json.templ
similarity index 92%
rename from edxapp/config/cms.auth.json
rename to edxapp/config/cms.auth.json.templ
index d3c3c8f..879c7fa 100644
--- a/edxapp/config/cms.auth.json
+++ b/edxapp/config/cms.auth.json.templ
@@ -1,5 +1,5 @@
 {
-  "SECRET_KEY": "7i#nri2i@--brp0sri9qf@ewlj1qxghv0%af$sk4ntn9pv$8t#",
+  "SECRET_KEY": "${SECRET_KEY}",
   "AWS_ACCESS_KEY_ID": "",
   "AWS_SECRET_ACCESS_KEY": "",
   "XQUEUE_INTERFACE": {
diff --git a/edxapp/config/cms.env.json b/edxapp/config/cms.env.json.templ
similarity index 87%
rename from edxapp/config/cms.env.json
rename to edxapp/config/cms.env.json.templ
index 339688b..7c7b415 100644
--- a/edxapp/config/cms.env.json
+++ b/edxapp/config/cms.env.json.templ
@@ -1,17 +1,17 @@
 {
-  "SITE_NAME": "studio.openedxdemo.overhang.io",
+  "SITE_NAME": "${CMS_HOST}",
   "BOOK_URL": "",
   "LOG_DIR": "/openedx/data/logs",
   "LOGGING_ENV": "sandbox",
   "OAUTH_OIDC_ISSUER": "http://localhost:8000/oauth2",
-  "PLATFORM_NAME": "Open edX Studio Demo Site (Ginkgo)",
+  "PLATFORM_NAME": "${PLATFORM_NAME}",
   "FEATURES": {
     "PREVIEW_LMS_BASE": "localhost:8000"
   },
-  "LMS_ROOT_URL": "http://openedxdemo.overhang.io",
-  "CMS_ROOT_URL": "http://studio.openedxdemo.overhang.io",
-  "CMS_BASE": "studio.openedxdemo.overhang.io",
-  "LMS_BASE": "openedxdemo.overhang.io",
+  "LMS_ROOT_URL": "http://${LMS_HOST}",
+  "CMS_ROOT_URL": "http://${CMS_HOST}",
+  "CMS_BASE": "${CMS_HOST}",
+  "LMS_BASE": "${LMS_HOST}",
   "CELERY_BROKER_HOSTNAME": "rabbitmq",
   "CELERY_BROKER_TRANSPORT": "amqp",
   "MEDIA_ROOT": "/openedx/data/uploads/",
diff --git a/edxapp/config/lms.auth.json b/edxapp/config/lms.auth.json.templ
similarity index 92%
rename from edxapp/config/lms.auth.json
rename to edxapp/config/lms.auth.json.templ
index d3c3c8f..879c7fa 100644
--- a/edxapp/config/lms.auth.json
+++ b/edxapp/config/lms.auth.json.templ
@@ -1,5 +1,5 @@
 {
-  "SECRET_KEY": "7i#nri2i@--brp0sri9qf@ewlj1qxghv0%af$sk4ntn9pv$8t#",
+  "SECRET_KEY": "${SECRET_KEY}",
   "AWS_ACCESS_KEY_ID": "",
   "AWS_SECRET_ACCESS_KEY": "",
   "XQUEUE_INTERFACE": {
diff --git a/edxapp/config/lms.env.json b/edxapp/config/lms.env.json.templ
similarity index 87%
rename from edxapp/config/lms.env.json
rename to edxapp/config/lms.env.json.templ
index 432715a..604a7c5 100644
--- a/edxapp/config/lms.env.json
+++ b/edxapp/config/lms.env.json.templ
@@ -1,16 +1,16 @@
 {
-  "SITE_NAME": "openedxdemo.overhang.io",
+  "SITE_NAME": "${LMS_HOST}",
   "BOOK_URL": "",
   "LOG_DIR": "/openedx/data/logs",
   "LOGGING_ENV": "sandbox",
   "OAUTH_OIDC_ISSUER": "http://localhost:8000/oauth2",
-  "PLATFORM_NAME": "Open edX Demo Site (Ginkgo)",
+  "PLATFORM_NAME": "${PLATFORM_NAME}",
   "FEATURES": {
-    "PREVIEW_LMS_BASE": "openedxdemo.overhang.io"
+    "PREVIEW_LMS_BASE": "${LMS_HOST}"
   },
-  "LMS_ROOT_URL": "http://openedxdemo.overhang.io",
-  "CMS_ROOT_URL": "http://studio.openedxdemo.overhang.io",
-  "CMS_BASE": "studio.openedxdemo.overhang.io",
+  "LMS_ROOT_URL": "http://${LMS_HOST}",
+  "CMS_ROOT_URL": "http://${CMS_HOST}",
+  "CMS_BASE": "${CMS_HOST}",
   "LMS_BASE": "openedxdemo.overhang.io",
   "CELERY_BROKER_HOSTNAME": "rabbitmq",
   "CELERY_BROKER_TRANSPORT": "amqp",
diff --git a/nginx/Dockerfile b/nginx/Dockerfile
index 257ace0..77104e5 100644
--- a/nginx/Dockerfile
+++ b/nginx/Dockerfile
@@ -1,6 +1,17 @@
 FROM nginx:1.13
-
 VOLUME /openedx/data
 
-COPY ./config/lms.conf /etc/nginx/conf.d/lms.conf
-COPY ./config/cms.conf /etc/nginx/conf.d/cms.conf
+# TODO install ced from pip
+RUN apt update
+RUN apt install -y curl python
+RUN curl https://raw.githubusercontent.com/regisb/ced/v0.2/ced/ced > /usr/local/bin/ced
+RUN chmod a+x /usr/local/bin/ced
+
+ARG lms_host=localhost
+ARG cms_host=studio.$lms_host
+ENV LMS_HOST=$lms_host CMS_HOST=$cms_host
+
+COPY ./config/lms.conf.templ /etc/nginx/conf.d/lms.conf.templ
+RUN ced -o /etc/nginx/conf.d/lms.conf -d £ /etc/nginx/conf.d/lms.conf.templ
+COPY ./config/cms.conf.templ /etc/nginx/conf.d/cms.conf.templ
+RUN ced -o /etc/nginx/conf.d/cms.conf -d £ /etc/nginx/conf.d/cms.conf.templ
diff --git a/nginx/config/cms.conf b/nginx/config/cms.conf.templ
similarity index 97%
rename from nginx/config/cms.conf
rename to nginx/config/cms.conf.templ
index bd400b9..150c530 100644
--- a/nginx/config/cms.conf
+++ b/nginx/config/cms.conf.templ
@@ -4,7 +4,7 @@ upstream cms-backend {
 
 server {
   listen 80;
-  server_name studio.openedxdemo.overhang.io;
+  server_name £{CMS_HOST};
   
   # Prevent invalid display courseware in IE 10+ with high privacy settings
   add_header P3P 'CP="Open edX does not have a P3P policy."';
diff --git a/nginx/config/lms.conf b/nginx/config/lms.conf.templ
similarity index 98%
rename from nginx/config/lms.conf
rename to nginx/config/lms.conf.templ
index e819603..7efe211 100644
--- a/nginx/config/lms.conf
+++ b/nginx/config/lms.conf.templ
@@ -4,7 +4,7 @@ upstream lms-backend {
 
 server {
   listen 80;
-  server_name openedxdemo.overhang.io;
+  server_name £{LMS_HOST};
   
   # Prevent invalid display courseware in IE 10+ with high privacy settings
   add_header P3P 'CP="Open edX does not have a P3P policy."';