diff --git a/autoconf/IngressController.py b/autoconf/IngressController.py
index 0904d90b..06e73b48 100644
--- a/autoconf/IngressController.py
+++ b/autoconf/IngressController.py
@@ -1,6 +1,6 @@
 from traceback import format_exc
 from kubernetes import client, config, watch
-from client.exceptions import ApiException
+from kubernetes.client.exceptions import ApiException
 from threading import Thread, Lock
 from logger import log
 from sys import exit
diff --git a/examples/mattermost/.env b/examples/mattermost/.env
new file mode 100644
index 00000000..77a84c89
--- /dev/null
+++ b/examples/mattermost/.env
@@ -0,0 +1,85 @@
+# Domain of service
+DOMAIN=www.example.com
+
+# Container settings
+## Timezone inside the containers. The value needs to be in the form 'Europe/Berlin'.
+## A list of these tz database names can be looked up at Wikipedia
+## https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+TZ=UTC
+RESTART_POLICY=unless-stopped
+
+# Postgres settings
+## Documentation for this image and available settings can be found on hub.docker.com
+## https://hub.docker.com/_/postgres
+## Please keep in mind this will create a superuser and it's recommended to use a less privileged
+## user to connect to the database.
+## A guide on how to change the database user to a nonsuperuser can be found in docs/creation-of-nonsuperuser.md
+POSTGRES_IMAGE_TAG=13-alpine
+POSTGRES_DATA_PATH=./volumes/db/var/lib/postgresql/data
+
+POSTGRES_USER=mmuser
+POSTGRES_PASSWORD=mmuser_password
+POSTGRES_DB=mattermost
+
+# Nginx
+## The nginx container will use a configuration found at the NGINX_MATTERMOST_CONFIG. The config aims
+## to be secure and uses a catch-all server vhost which will work out-of-the-box. For additional settings
+## or changes ones can edit it or provide another config. Important note: inside the container, nginx sources
+## every config file inside */etc/nginx/conf.d* ending with a *.conf* file extension.
+
+## Inside the container the uid and gid is 101. The folder owner can be set with
+## `sudo chown -R 101:101 ./nginx` if needed.
+NGINX_IMAGE_TAG=alpine
+
+## The folder containing server blocks and any additional config to nginx.conf
+NGINX_CONFIG_PATH=./nginx/conf.d
+NGINX_DHPARAMS_FILE=./nginx/dhparams4096.pem
+
+CERT_PATH=./volumes/web/cert/cert.pem
+KEY_PATH=./volumes/web/cert/key-no-password.pem
+#GITLAB_PKI_CHAIN_PATH=<path_to_your_gitlab_pki>/pki_chain.pem
+#CERT_PATH=./certs/etc/letsencrypt/live/${DOMAIN}/fullchain.pem
+#KEY_PATH=./certs/etc/letsencrypt/live/${DOMAIN}/privkey.pem
+
+## Exposed ports to the host. Inside the container 80 and 443 will be used
+HTTPS_PORT=443
+HTTP_PORT=80
+
+# Mattermost settings
+## Inside the container the uid and gid is 2000. The folder owner can be set with
+## `sudo chown -R 2000:2000 ./volumes/app/mattermost`.
+MATTERMOST_CONFIG_PATH=./volumes/app/mattermost/config
+MATTERMOST_DATA_PATH=./volumes/app/mattermost/data
+MATTERMOST_LOGS_PATH=./volumes/app/mattermost/logs
+MATTERMOST_PLUGINS_PATH=./volumes/app/mattermost/plugins
+MATTERMOST_CLIENT_PLUGINS_PATH=./volumes/app/mattermost/client/plugins
+MATTERMOST_BLEVE_INDEXES_PATH=./volumes/app/mattermost/bleve-indexes
+
+## Bleve index (inside the container)
+MM_BLEVESETTINGS_INDEXDIR=/mattermost/bleve-indexes
+
+## This will be 'mattermost-enterprise-edition' or 'mattermost-team-edition' based on the version of Mattermost you're installing.
+MATTERMOST_IMAGE=mattermost-enterprise-edition
+MATTERMOST_IMAGE_TAG=6.3
+
+## Make Mattermost container readonly. This interferes with the regeneration of root.html inside the container. Only use
+## it if you know what you're doing.
+## See https://github.com/mattermost/docker/issues/18
+MATTERMOST_CONTAINER_READONLY=false
+
+## The app port is only relevant for using Mattermost without the nginx container as reverse proxy. This is not meant
+## to be used with the internal HTTP server exposed but rather in case one wants to host several services on one host
+## or for using it behind another existing reverse proxy.
+APP_PORT=8065
+
+## Configuration settings for Mattermost. Documentation on the variables and the settings itself can be found at
+## https://docs.mattermost.com/administration/config-settings.html
+## Keep in mind that variables set here will take precedence over the same setting in config.json. This includes
+## the system console as well and settings set with env variables will be greyed out.
+
+## Below one can find necessary settings to spin up the Mattermost container
+MM_SQLSETTINGS_DRIVERNAME=postgres
+MM_SQLSETTINGS_DATASOURCE=postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@postgres:5432/${POSTGRES_DB}?sslmode=disable&connect_timeout=10
+
+## Example settings (any additional setting added here also needs to be introduced in the docker-compose.yml)
+MM_SERVICESETTINGS_SITEURL=https://${DOMAIN}
diff --git a/examples/mattermost/docker-compose.yml b/examples/mattermost/docker-compose.yml
new file mode 100644
index 00000000..dd42ae70
--- /dev/null
+++ b/examples/mattermost/docker-compose.yml
@@ -0,0 +1,87 @@
+version: '3'
+
+services:
+
+  mybunker:
+    image: bw
+    ports:
+      - 80:8080
+      - 443:8443
+    # ⚠️ read this if you use local folders for volumes ⚠️
+    # bunkerweb runs as an unprivileged user with UID/GID 101
+    # don't forget to edit the permissions of the files and folders accordingly
+    # example if you need to create a directory : mkdir folder && chown root:101 folder && chmod 770 folder
+    # another example for existing folder : chown -R root:101 folder && chmod -R 770 folder
+    # more info at https://docs.bunkerweb.io
+    volumes:
+      - bw_data:/data
+    environment:
+      - SERVER_NAME=www.example.com # replace with your domain
+      - AUTO_LETS_ENCRYPT=yes
+      - DISABLE_DEFAULT_SERVER=yes
+      - USE_CLIENT_CACHE=yes
+      - SERVE_FILES=no
+      - MAX_CLIENT_SIZE=50m
+      - ALLOWED_METHODS=GET|POST|HEAD|DELETE|PUT
+      - USE_GZIP=yes
+      - USE_REVERSE_PROXY=yes
+      - REVERSE_PROXY_URL_1=/
+      - REVERSE_PROXY_HOST_1=http://mattermost:8065
+      - REVERSE_PROXY_URL_2=~ /api/v[0-9]+/(users/)?websocket$$
+      - REVERSE_PROXY_WS_2=yes
+
+  mattermost:
+    depends_on:
+      - postgres
+    image: mattermost/${MATTERMOST_IMAGE}:${MATTERMOST_IMAGE_TAG}
+    restart: ${RESTART_POLICY}
+    security_opt:
+      - no-new-privileges:true
+    pids_limit: 200
+    read_only: ${MATTERMOST_CONTAINER_READONLY}
+    tmpfs:
+      - /tmp
+    volumes:
+      - ${MATTERMOST_CONFIG_PATH}:/mattermost/config:rw
+      - ${MATTERMOST_DATA_PATH}:/mattermost/data:rw
+      - ${MATTERMOST_LOGS_PATH}:/mattermost/logs:rw
+      - ${MATTERMOST_PLUGINS_PATH}:/mattermost/plugins:rw
+      - ${MATTERMOST_CLIENT_PLUGINS_PATH}:/mattermost/client/plugins:rw
+      - ${MATTERMOST_BLEVE_INDEXES_PATH}:/mattermost/bleve-indexes:rw
+      # When you want to use SSO with GitLab, you have to add the cert pki chain of GitLab inside Alpine
+      # to avoid Token request failed: certificate signed by unknown authority 
+      # (link: https://github.com/mattermost/mattermost-server/issues/13059 and https://github.com/mattermost/docker/issues/34)
+      # - ${GITLAB_PKI_CHAIN_PATH}:/etc/ssl/certs/pki_chain.pem:ro
+    environment:
+      # timezone inside container
+      - TZ
+      # necessary Mattermost options/variables (see env.example)
+      - MM_SQLSETTINGS_DRIVERNAME
+      - MM_SQLSETTINGS_DATASOURCE
+      # necessary for bleve
+      - MM_BLEVESETTINGS_INDEXDIR
+      # additional settings
+      - MM_SERVICESETTINGS_SITEURL
+
+  postgres:
+    image: postgres:${POSTGRES_IMAGE_TAG}
+    restart: ${RESTART_POLICY}
+    security_opt:
+      - no-new-privileges:true
+    pids_limit: 100
+    read_only: true
+    tmpfs:
+      - /tmp
+      - /var/run/postgresql
+    volumes:
+      - ${POSTGRES_DATA_PATH}:/var/lib/postgresql/data
+    environment:
+      # timezone inside container
+      - TZ
+      # necessary Postgres options/variables
+      - POSTGRES_USER
+      - POSTGRES_PASSWORD
+      - POSTGRES_DB
+
+volumes:
+  bw_data: