diff --git a/README.md b/README.md
index 2814831..2c7542b 100644
--- a/README.md
+++ b/README.md
@@ -23,10 +23,10 @@ This repo is meant to be the starting point for somebody who likes to use docker
 In environments with more then one web applications it is necessary to use a reverse proxy to route connections to port 80 and 443 to the right application.
 To run Zammad behind a revers proxy, we provide `docker-compose.proxy-example.yml` as a starting point.
 
-1. Copy `./.examples/proxy/docker-compose.proxy-example.yml` to your own configuration, e.g. `./docker-compose.prod.yml`  
+1. Copy `./.examples/proxy/docker-compose.proxy-example.yml` to your own configuration, e.g. `./docker-compose.prod.yml`
     `cp ./.examples/proxy/docker-compose.proxy-example.yml ./docker-compose.prod.yml`
 2. Modify the environment variable `VIRTUAL_HOST` and the name of the external network in `./docker-compose.prod.yml` to fit your environment.
-3. Run docker-composer commands with the default and your configuration, e.g. `docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d`  
+3. Run docker-composer commands with the default and your configuration, e.g. `docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d`
 
 See `.examples/proxy/docker-compose.yml` for an example proxy project.
 
@@ -50,14 +50,13 @@ Elasticsearch is enabled by default in the example `docker-compose.yml` file. It
 
 We've updated the Elasticsearch image from 5.6 to 7.6.
 As there is no direct upgrade path we have to delete all Elasticsearch indices and rebuild them.
-Do the following to empty the ES docker volume:
+This will depend on the name of your docker container and volume, which depends on the checkout directory (`zammad-docker-compose` by default):
 
 ```console
 docker-compose stop
-set -o pipefail DOCKER_VOLUME="$(docker volume inspect zammaddockercompose_elasticsearch-data | grep Mountpoint | sed -e 's#.*": "##g' -e 's#",##')/*"
-echo "${DOCKER_VOLUME}" #check this is a valid docker volume path! if not do not proceed or you might lose data!
-rm -r $(docker volume inspect zammaddockercompose_elasticsearch-data | grep Mountpoint | sed -e 's#.*": "##g' -e 's#",##')/*
-docker-compose start
+docker container rm zammad-docker-compose_zammad-elasticsearch_1
+docker volume rm zammad-docker-compose_elasticsearch-data
+docker-compose up --no-recreate
 ```
 
 To workaround the [changes in the PostgreSQL 9.6 container](https://github.com/docker-library/postgres/commit/f1bc8782e7e57cc403d0b32c0e24599535859f76) do the following:
diff --git a/containers/zammad/Dockerfile b/containers/zammad/Dockerfile
index 3daacef..d599e1b 100644
--- a/containers/zammad/Dockerfile
+++ b/containers/zammad/Dockerfile
@@ -1,6 +1,6 @@
-FROM ruby:2.7.4-slim AS builder
 # note: zammad is currently incompatible to alpine because of:
 # https://github.com/docker-library/ruby/issues/113
+FROM ruby:2.7.4-slim AS builder
 
 ARG BUILD_DATE
 ARG DEBIAN_FRONTEND=noninteractive
diff --git a/containers/zammad/docker-entrypoint.sh b/containers/zammad/docker-entrypoint.sh
index b104d4a..619cbd1 100755
--- a/containers/zammad/docker-entrypoint.sh
+++ b/containers/zammad/docker-entrypoint.sh
@@ -54,7 +54,9 @@ if [ "$1" = 'zammad-init' ]; then
   cd "${ZAMMAD_DIR}"
 
   # configure database
-  sed -e "s#.*adapter:.*#  adapter: postgresql#g" -e "s#.*database:.*#  database: ${POSTGRESQL_DB}#g" -e "s#.*username:.*#  username: ${POSTGRESQL_USER}#g" -e "s#.*password:.*#  password: ${POSTGRESQL_PASS}\\n  host: ${POSTGRESQL_HOST}\\n  port: ${POSTGRESQL_PORT}#g" < contrib/packager.io/database.yml.pkgr > config/database.yml
+  # https://stackoverflow.com/questions/407523/escape-a-string-for-a-sed-replace-pattern
+  ESCAPED_POSTGRESQL_PASS=$(echo "$POSTGRESQL_PASS" | sed -e 's/[\/&]/\\&/g')
+  sed -e "s#.*adapter:.*#  adapter: postgresql#g" -e "s#.*database:.*#  database: ${POSTGRESQL_DB}#g" -e "s#.*username:.*#  username: ${POSTGRESQL_USER}#g" -e "s#.*password:.*#  password: ${ESCAPED_POSTGRESQL_PASS}\\n  host: ${POSTGRESQL_HOST}\\n  port: ${POSTGRESQL_PORT}#g" < contrib/packager.io/database.yml.pkgr > config/database.yml
 
   # configure memcache
   sed -i -e "s/.*config.cache_store.*file_store.*cache_file_store.*/    config.cache_store = :dalli_store, '${MEMCACHED_HOST}:${MEMCACHED_PORT}'\\n    config.session_store = :dalli_store, '${MEMCACHED_HOST}:${MEMCACHED_PORT}'/" config/application.rb