diff --git a/.VERSION b/.VERSION
index 58d9f45..536a94d 100644
--- a/.VERSION
+++ b/.VERSION
@@ -1 +1 @@
-v4.2.3beta
+v4.2.4beta
diff --git a/README.md b/README.md
index 82adb8a..e9143d6 100644
--- a/README.md
+++ b/README.md
@@ -76,6 +76,7 @@ You do not have to declare every single variable when setting up your container.
 |---|---|---|
 |AVAHI|false|Installs and activates avahi-daemon for supporting yahka-adapter, can be "true" or "false"|
 |IOB_ADMINPORT|8081|Sets ioBroker adminport on startup|
+|IOB_MULTIHOST|master|Sets ioBroker instance as "master" or "slave" for multihost (additional config for objectsdb and statesdb needed)|
 |IOB_OBJECTSDB_HOST|127.0.0.1|Sets hostname for ioBroker objects db|
 |IOB_OBJECTSDB_PORT|9001|Sets port for ioBroker objects db|
 |IOB_OBJECTSDB_TYPE|file|Sets type of ioBroker objects db, cloud be "file", "redis" or "couch"|
@@ -119,6 +120,10 @@ Basically there are two different scripts which will be read and called by the s
 Hint:
 To get familiar with that feature try the following: Create a Container, mount an empty folder to /opt/userscripts, start your container. Two scripts will be restored into the empty folder. Rename the example scripts by simply removing "\_example". Restart your container and take a look at the Log. In "Step 4 of 5: Applying special settings" you will see the messages generated by the example userscripts.
 
+### Multihost
+
+Details will follow soon.
+
 ## Best practices
 
 ### Avoid using "latest" tag
@@ -157,8 +162,13 @@ Thank you!
 
 ## Changelog
 
-### v4.2.3beta (2020-06-05)
-* updating js-controller to not stable version 3.1.5 to fix renaming issue
+### v4.2.4beta (2020-06-23)
+* added graceful shutdown
+* small fix for GID/UID handling
+* adding new ENV "IOB_MULTIHOST" for multihost support
+* small syntax fixes in iobroker_startup.sh
+* v4.2.3beta (2020-06-05)
+  * updating js-controller to not stable version 3.1.5 to fix renaming issue
 * v4.2.2beta (2020-06-03)
   * ~~workaround for renaming issues on startup~~ (fixed in js-controller)
 * v4.2.1beta (2020-05-10)
diff --git a/aarch64/Dockerfile b/aarch64/Dockerfile
index d4e3e90..85f6760 100644
--- a/aarch64/Dockerfile
+++ b/aarch64/Dockerfile
@@ -79,14 +79,15 @@ RUN tar -cf /opt/initial_iobroker.tar /opt/iobroker \
 
 # Setting up iobroker-user (shell and home directory)
 RUN chsh -s /bin/bash iobroker \
-    && usermod --home /opt/iobroker iobroker
+    && usermod --home /opt/iobroker iobroker \
+    && usermod -u 1000 iobroker \
+    && groupmod -g 1000 iobroker
 
 # Setting up ENVs
 ENV DEBIAN_FRONTEND="teletype" \
     LANG="de_DE.UTF-8" \
     LANGUAGE="de_DE:de" \
     LC_ALL="de_DE.UTF-8" \
-    PACKAGES="vi" \
     SETGID=1000 \
     SETUID=1000 \
     TZ="Europe/Berlin"
diff --git a/aarch64/scripts/iobroker_startup.sh b/aarch64/scripts/iobroker_startup.sh
index 4c2b690..63c4e89 100644
--- a/aarch64/scripts/iobroker_startup.sh
+++ b/aarch64/scripts/iobroker_startup.sh
@@ -3,6 +3,7 @@
 # Reading ENV
 adminport=$IOB_ADMINPORT
 avahi=$AVAHI
+multihost=$IOB_MULTIHOST
 objectsdbhost=$IOB_OBJECTSDB_HOST
 objectsdbport=$IOB_OBJECTSDB_PORT
 objectsdbtype=$IOB_OBJECTSDB_TYPE
@@ -75,7 +76,7 @@ then
     echo "Installing additional packages is set by ENV."
     echo "The following packages will be installed:" $packages"..."
     echo $packages > /opt/scripts/.packages
-    bash /opt/scripts/setup_packages.sh
+      bash /opt/scripts/setup_packages.sh
     echo "Done."
     echo ' '
   fi
@@ -83,13 +84,14 @@ then
   then
     echo "Different UID and/ or GID is set by ENV."
     echo "Changing UID to "$setuid" and GID to "$setgid"..."
-    usermod -u $setuid iobroker
-    groupmod -g $setgid iobroker
+      usermod -u $setuid iobroker
+      groupmod -g $setgid iobroker
     echo "Done."
     echo ' '
   fi
 else
   echo "Nothing to do here."
+  echo ' '
 fi
 
 # Change directory for next steps
@@ -107,7 +109,7 @@ echo ' '
 if [ `find /opt/iobroker -type f | wc -l` -lt 1 ]
 then
   echo "There is no data detected in /opt/iobroker. Restoring initial ioBroker installation..."
-  tar -xf /opt/initial_iobroker.tar -C /
+    tar -xf /opt/initial_iobroker.tar -C /
   echo "Done."
 elif [ -f /opt/iobroker/iobroker ]
 then
@@ -115,11 +117,11 @@ then
 elif [ $(ls iobroker_20* 2> /dev/null | wc -l) != "0" ] && [ $(tar -ztvf /opt/iobroker/iobroker_20*.tar.gz "backup/backup.json" 2> /dev/null | wc -l) != "0" ]
 then
   echo "ioBroker backup file detected in /opt/iobroker. Restoring ioBroker..."
-  mv /opt/iobroker/*.tar.gz /opt/
-  tar -xf /opt/initial_iobroker.tar -C /
-  mkdir /opt/iobroker/backups
-  mv /opt/*.tar.gz /opt/iobroker/backups/
-  iobroker restore 0 > /opt/iobroker/log/restore.log 2>&1
+    mv /opt/iobroker/*.tar.gz /opt/
+    tar -xf /opt/initial_iobroker.tar -C /
+    mkdir /opt/iobroker/backups
+    mv /opt/*.tar.gz /opt/iobroker/backups/
+    iobroker restore 0 > /opt/iobroker/log/restore.log 2>&1
   echo "Done."
   echo ' '
   echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
@@ -200,7 +202,7 @@ then
   then
     echo "Adminport set by ENV does not match port configured in ioBroker installation."
     echo "Setting Adminport to \""$adminport"\"..."
-    bash iobroker set admin.0 --port $adminport
+      bash iobroker set admin.0 --port $adminport
     echo "Done."
     echo ' '
   fi
@@ -213,8 +215,8 @@ then
   if [ "$avahi" = "true" ]
   then
     echo "Avahi-daemon is activated by ENV."
-    chmod 755 /opt/scripts/setup_avahi.sh
-    bash /opt/scripts/setup_avahi.sh
+      chmod 755 /opt/scripts/setup_avahi.sh
+      bash /opt/scripts/setup_avahi.sh
     echo "Done."
     echo ' '
   fi
@@ -227,8 +229,8 @@ then
   if [ "$zwave" = "true" ]
   then
     echo "Z-Wave is activated by ENV."
-    chmod 755 /opt/scripts/setup_zwave.sh
-    bash /opt/scripts/setup_zwave.sh
+      chmod 755 /opt/scripts/setup_zwave.sh
+      bash /opt/scripts/setup_zwave.sh
     echo "Done."
     echo ' '
   fi
@@ -254,6 +256,89 @@ then
 fi
 
 
+# Checking ENV for multihost setup
+# Configuring objects db host
+if [ "$multihost" = "master" ] && [ "$objectsdbtype" = "" ] && [ "$objectsdbhost" = "" ] && [ "$objectsdbport" = "" ]
+then
+  echo "Multihost is set as \"master\" by ENV and no external objects db is set."
+  echo "Setting host of objects db to \"0.0.0.0\" to allow external communication..."
+    jq --arg objectsdbhost "0.0.0.0" '.objects.host = $objectsdbhost' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+  echo "Done."
+  echo ' '
+elif [ "$multihost" = "master" ] && [ "$objectsdbhost" = "127.0.0.1" ]
+then
+  echo "Multihost is set as \"master\" by ENV. But objects db host is set to \"127.0.0.1\" by ENV too."
+  echo "This configuration will not work! Please change or remove ENV \"IOB_OBJECTSDB_HOST\" and start over!"
+  echo "For more information see readme.md on Github (https://github.com/buanet/docker-iobroker)."
+  exit 1
+elif [ "$multihost" = "master" ] &&  [ "$objectsdbtype" != "" ] && [ "$objectsdbhost" != "" ] && [ "$objectsdbport" != "" ]
+then
+  echo "Multihost is set as \"master\" by ENV and external objects db is set."
+  echo "Skipping this step..."
+  echo "Done."
+  echo ' '
+elif ([ "$multihost" = "slave" ] && [ "$objectsdbtype" = "" ]) || ([ "$multihost" = "slave" ] && [ "$objectsdbhost" = "" ]) || ([ "$multihost" = "slave" ] && [ "$objectsdbport" = "" ])
+then
+  echo "Multihost is set as \"slave\" by ENV. But no external objects db is set."
+  echo "You have to configure ENVs \"IOB_OBJECTSDB_TYPE\", \"IOB_OBJECTSDB_HOST\" and \"IOB_OBJECTSDB_PORT\" to connect to a maser objects db."
+  echo "Please check your settings and start over."
+  echo "For more information see readme.md on Github (https://github.com/buanet/docker-iobroker)."
+  exit 1
+elif [ "$multihost" = "slave" ] && [ "$objectsdbtype" != "" ] && [ "$objectsdbhost" != "" ] && [ "$objectsdbport" != "" ]
+then
+  echo "Multihost is set as \"slave\" by ENV and external objects db is set."
+  echo "Skipping this step..."
+  echo "Done."
+  echo ' '
+elif [ "$multihost" != "" ]
+then
+  echo "Multihost is set but it seems like some configuration is missing."
+  echo "Please checke if you have configured the ENVs \"MULTIHOST\", \"IOB_OBJECTSDB_TYPE\", \"IOB_OBJECTSDB_HOST\" and \"IOB_OBJECTSDB_PORT\" correctly and start over."
+  echo "For more information see readme.md on Github (https://github.com/buanet/docker-iobroker)."
+  exit 1
+fi
+#Configuring states db host
+if [ "$multihost" = "master" ] && [ "$statesdbtype" = "" ] && [ "$statesdbhost" = "" ] && [ "$statesdbport" = "" ]
+then
+  echo "Multihost is set as \"master\" by ENV and no external states db is set."
+  echo "Setting host of states db to \"0.0.0.0\" to allow external communication..."
+    jq --arg statesdbhost "0.0.0.0" '.states.host = $statesdbhost' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+  echo "Done."
+  echo ' '
+elif [ "$multihost" = "master" ] && [ "$statesdbhost" = "127.0.0.1" ]
+then
+  echo "Multihost is set as \"master\" by ENV. But states db host is set to \"127.0.0.1\" by ENV too."
+  echo "This configuration will not work! Please change or remove ENV \"IOB_STATESDB_HOST\" and start over!"
+  echo "For more information see readme.md on Github (https://github.com/buanet/docker-iobroker)."
+  exit 1
+elif [ "$multihost" = "master" ] && [ "$statesdbtype" != "" ] && [ "$statesdbhost" != "" ] && [ "$statesdbport" != "" ]
+then
+  echo "Multihost is set as \"master\" by ENV and external states db is set."
+  echo "Skipping this step..."
+  echo "Done."
+  echo ' '
+elif ([ "$multihost" = "slave" ] && [ "$statesdbtype" = "" ]) || ([ "$multihost" = "slave" ] && [ "$statesdbhost" = "" ]) || ([ "$multihost" = "slave" ] && [ "$statesdbport" = "" ])
+then
+  echo "Multihost is set as \"slave\" by ENV. But no external states db is set."
+  echo "You have to configure ENVs \"IOB_STATESDB_TYPE\", \"IOB_STATESDB_HOST\" and \"IOB_STATESDB_PORT\" to connect to a maser states db."
+  echo "Please check your settings and start over."
+  echo "For more information see readme.md on Github (https://github.com/buanet/docker-iobroker)."
+  exit 1
+elif [ "$multihost" = "slave" ] && [ "$statesdbtype" != "" ] && [ "$statesdbhost" != "" ] && [ "$statesdbport" != "" ]
+then
+  echo "Multihost is set as \"slave\" by ENV and external states db is set."
+  echo "Skipping this step..."
+  echo "Done."
+  echo ' '
+elif [ "$multihost" != "" ]
+then
+  echo "Multihost is set but it seems like some configuration is missing."
+  echo "Please checke if you have configured the ENVs \"MULTIHOST\", \"IOB_STATESDB_TYPE\", \"IOB_STATESDB_HOST\" and \"IOB_STATESTDB_PORT\" correctly and start over."
+  echo "For more information see readme.md on Github (https://github.com/buanet/docker-iobroker)."
+  exit 1
+fi
+
+
 # Checking ENVs for custom setup of objects db
 if [ "$objectsdbtype" != "" ] || [ "$objectsdbhost" != "" ] || [ "$objectsdbport" != "" ]
 then
@@ -261,7 +346,7 @@ then
   then
     echo "ENV IOB_OBJECTSDB_TYPE is set and value is different from detected ioBroker installation."
     echo "Setting type of objects db to \""$objectsdbtype"\"..."
-    jq --arg objectsdbtype "$objectsdbtype" '.objects.type = $objectsdbtype' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+      jq --arg objectsdbtype "$objectsdbtype" '.objects.type = $objectsdbtype' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
     echo "Done."
   else
     echo "ENV IOB_OBJECTSDB_TYPE is set and value meets detected ioBroker installation. Nothing to do here."
@@ -270,7 +355,7 @@ then
   then
     echo "ENV IOB_OBJECTSDB_HOST is set and value is different from detected ioBroker installation."
     echo "Setting host of objects db to \""$objectsdbhost"\"..."
-    jq --arg objectsdbhost "$objectsdbhost" '.objects.host = $objectsdbhost' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+      jq --arg objectsdbhost "$objectsdbhost" '.objects.host = $objectsdbhost' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
     echo "Done."
   else
     echo "ENV IOB_OBJECTSDB_HOST is set and value meets detected ioBroker installation. Nothing to do here."
@@ -279,7 +364,7 @@ then
   then
     echo "ENV IOB_OBJECTSDB_PORT is set and value is different from detected ioBroker installation."
     echo "Setting port of objects db to \""$objectsdbport"\"..."
-    jq --arg objectsdbport "$objectsdbport" '.objects.port = $objectsdbport' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+      jq --arg objectsdbport "$objectsdbport" '.objects.port = $objectsdbport' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
     echo "Done."
   else
     echo "ENV IOB_OBJECTSDB_PORT is set and value meets detected ioBroker installation. Nothing to do here."
@@ -295,7 +380,7 @@ then
   then
     echo "ENV IOB_STATESDB_TYPE is set and value is different from detected ioBroker installation."
     echo "Setting type of states db to \""$statesdbtype"\"..."
-    jq --arg statesdbtype "$statesdbtype" '.states.type = $statesdbtype' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+      jq --arg statesdbtype "$statesdbtype" '.states.type = $statesdbtype' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
     echo "Done."
   else
     echo "ENV IOB_STATESDB_TYPE is set and value meets detected ioBroker installation. Nothing to do here."
@@ -304,7 +389,7 @@ then
   then
     echo "ENV IOB_STATESDB_HOST is set and value is different from detected ioBroker installation."
     echo "Setting host of states db to \""$statesdbhost"\"..."
-    jq --arg statesdbhost "$statesdbhost" '.states.host = $statesdbhost' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+      jq --arg statesdbhost "$statesdbhost" '.states.host = $statesdbhost' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
     echo "Done."
   else
     echo "ENV IOB_STATESDB_HOST is set and value meets detected ioBroker installation. Nothing to do here."
@@ -313,7 +398,7 @@ then
   then
     echo "ENV IOB_STATESDB_PORT is set and value is different from detected ioBroker installation."
     echo "Setting port of states db to \""$statesdbport"\"..."
-    jq --arg statesdbport "$statesdbport" '.states.port = $statesdbport' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+      jq --arg statesdbport "$statesdbport" '.states.port = $statesdbport' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
     echo "Done."
   else
     echo "ENV IOB_STATESDB_PORT is set and value meets detected ioBroker installation. Nothing to do here."
@@ -326,9 +411,9 @@ fi
 if [ `find /opt/userscripts -type f | wc -l` -lt 1 ]
 then
   echo "There is no data detected in /opt/userscripts. Restoring exapmple userscripts..."
-  tar -xf /opt/initial_userscripts.tar -C /
-  chmod 755 /opt/userscripts/userscript_firststart_example.sh
-  chmod 755 /opt/userscripts/userscript_everystart_example.sh
+    tar -xf /opt/initial_userscripts.tar -C /
+    chmod 755 /opt/userscripts/userscript_firststart_example.sh
+    chmod 755 /opt/userscripts/userscript_everystart_example.sh
   echo "Done."
   echo ' '
 elif [ -f /opt/userscripts/userscript_firststart.sh ] || [ -f /opt/userscripts/userscript_everystart.sh ]
@@ -337,26 +422,23 @@ then
   then
     echo "Userscript for first start detected and this is the first start of a new container."
     echo "Running userscript_firststart.sh..."
-    chmod 755 /opt/userscripts/userscript_firststart.sh
-    bash /opt/userscripts/userscript_firststart.sh
-    rm -f /opt/.firstrun
+      chmod 755 /opt/userscripts/userscript_firststart.sh
+      bash /opt/userscripts/userscript_firststart.sh
+      rm -f /opt/.firstrun
     echo "Done."
     echo ' '
   fi
   if [ -f /opt/userscripts/userscript_everystart.sh ]
   then
     echo "Userscript for every start detected. Running userscript_everystart.sh..."
-    chmod 755 /opt/userscripts/userscript_everystart.sh
-    bash /opt/userscripts/userscript_everystart.sh
+      chmod 755 /opt/userscripts/userscript_everystart.sh
+      bash /opt/userscripts/userscript_everystart.sh
     echo "Done."
     echo ' '
   fi
 fi
 
 
-sleep 5
-
-
 #####
 # Starting ioBroker
 #####
@@ -367,7 +449,21 @@ echo ' '
 echo "Starting ioBroker..."
 echo ' '
 
-gosu iobroker node node_modules/iobroker.js-controller/controller.js
+# Function for graceful shutdown by SIGTERM signal
+shut_down() {
+  echo ' '
+  echo "Recived termination signal (SIGTERM)."
+  echo "Shutting down ioBroker..."
+  pid=$(ps -ef | awk '/[j]s.controller/{print $2}')
+  kill -SIGTERM "$pid"
+  exit
+}
 
-# Preventing container restart by keeping a process alive even if iobroker will be stopped
+# Trap to get signal for graceful shutdown
+trap 'shut_down' SIGTERM
+
+# IoBroker start
+gosu iobroker node node_modules/iobroker.js-controller/controller.js & wait
+
+# Fallback process for keeping container running when ioBroker is stopped for maintenance (e.g. js-controller update)
 tail -f /dev/null
diff --git a/amd64/scripts/iobroker_startup.sh b/amd64/scripts/iobroker_startup.sh
index 0d0fb0d..63c4e89 100644
--- a/amd64/scripts/iobroker_startup.sh
+++ b/amd64/scripts/iobroker_startup.sh
@@ -459,9 +459,11 @@ shut_down() {
   exit
 }
 
+# Trap to get signal for graceful shutdown
 trap 'shut_down' SIGTERM
 
+# IoBroker start
 gosu iobroker node node_modules/iobroker.js-controller/controller.js & wait
 
-# Preventing container restart by keeping a process alive even if iobroker will be stopped
+# Fallback process for keeping container running when ioBroker is stopped for maintenance (e.g. js-controller update)
 tail -f /dev/null
diff --git a/armv7hf/Dockerfile b/armv7hf/Dockerfile
index ce66351..63f217f 100644
--- a/armv7hf/Dockerfile
+++ b/armv7hf/Dockerfile
@@ -79,14 +79,15 @@ RUN tar -cf /opt/initial_iobroker.tar /opt/iobroker \
 
 # Setting up iobroker-user (shell and home directory)
 RUN chsh -s /bin/bash iobroker \
-    && usermod --home /opt/iobroker iobroker
+    && usermod --home /opt/iobroker iobroker \
+    && usermod -u 1000 iobroker \
+    && groupmod -g 1000 iobroker
 
 # Setting up ENVs
 ENV DEBIAN_FRONTEND="teletype" \
     LANG="de_DE.UTF-8" \
     LANGUAGE="de_DE:de" \
     LC_ALL="de_DE.UTF-8" \
-    PACKAGES="vim" \
     SETGID=1000 \
     SETUID=1000 \
     TZ="Europe/Berlin"
diff --git a/armv7hf/scripts/iobroker_startup.sh b/armv7hf/scripts/iobroker_startup.sh
index 4c2b690..63c4e89 100644
--- a/armv7hf/scripts/iobroker_startup.sh
+++ b/armv7hf/scripts/iobroker_startup.sh
@@ -3,6 +3,7 @@
 # Reading ENV
 adminport=$IOB_ADMINPORT
 avahi=$AVAHI
+multihost=$IOB_MULTIHOST
 objectsdbhost=$IOB_OBJECTSDB_HOST
 objectsdbport=$IOB_OBJECTSDB_PORT
 objectsdbtype=$IOB_OBJECTSDB_TYPE
@@ -75,7 +76,7 @@ then
     echo "Installing additional packages is set by ENV."
     echo "The following packages will be installed:" $packages"..."
     echo $packages > /opt/scripts/.packages
-    bash /opt/scripts/setup_packages.sh
+      bash /opt/scripts/setup_packages.sh
     echo "Done."
     echo ' '
   fi
@@ -83,13 +84,14 @@ then
   then
     echo "Different UID and/ or GID is set by ENV."
     echo "Changing UID to "$setuid" and GID to "$setgid"..."
-    usermod -u $setuid iobroker
-    groupmod -g $setgid iobroker
+      usermod -u $setuid iobroker
+      groupmod -g $setgid iobroker
     echo "Done."
     echo ' '
   fi
 else
   echo "Nothing to do here."
+  echo ' '
 fi
 
 # Change directory for next steps
@@ -107,7 +109,7 @@ echo ' '
 if [ `find /opt/iobroker -type f | wc -l` -lt 1 ]
 then
   echo "There is no data detected in /opt/iobroker. Restoring initial ioBroker installation..."
-  tar -xf /opt/initial_iobroker.tar -C /
+    tar -xf /opt/initial_iobroker.tar -C /
   echo "Done."
 elif [ -f /opt/iobroker/iobroker ]
 then
@@ -115,11 +117,11 @@ then
 elif [ $(ls iobroker_20* 2> /dev/null | wc -l) != "0" ] && [ $(tar -ztvf /opt/iobroker/iobroker_20*.tar.gz "backup/backup.json" 2> /dev/null | wc -l) != "0" ]
 then
   echo "ioBroker backup file detected in /opt/iobroker. Restoring ioBroker..."
-  mv /opt/iobroker/*.tar.gz /opt/
-  tar -xf /opt/initial_iobroker.tar -C /
-  mkdir /opt/iobroker/backups
-  mv /opt/*.tar.gz /opt/iobroker/backups/
-  iobroker restore 0 > /opt/iobroker/log/restore.log 2>&1
+    mv /opt/iobroker/*.tar.gz /opt/
+    tar -xf /opt/initial_iobroker.tar -C /
+    mkdir /opt/iobroker/backups
+    mv /opt/*.tar.gz /opt/iobroker/backups/
+    iobroker restore 0 > /opt/iobroker/log/restore.log 2>&1
   echo "Done."
   echo ' '
   echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
@@ -200,7 +202,7 @@ then
   then
     echo "Adminport set by ENV does not match port configured in ioBroker installation."
     echo "Setting Adminport to \""$adminport"\"..."
-    bash iobroker set admin.0 --port $adminport
+      bash iobroker set admin.0 --port $adminport
     echo "Done."
     echo ' '
   fi
@@ -213,8 +215,8 @@ then
   if [ "$avahi" = "true" ]
   then
     echo "Avahi-daemon is activated by ENV."
-    chmod 755 /opt/scripts/setup_avahi.sh
-    bash /opt/scripts/setup_avahi.sh
+      chmod 755 /opt/scripts/setup_avahi.sh
+      bash /opt/scripts/setup_avahi.sh
     echo "Done."
     echo ' '
   fi
@@ -227,8 +229,8 @@ then
   if [ "$zwave" = "true" ]
   then
     echo "Z-Wave is activated by ENV."
-    chmod 755 /opt/scripts/setup_zwave.sh
-    bash /opt/scripts/setup_zwave.sh
+      chmod 755 /opt/scripts/setup_zwave.sh
+      bash /opt/scripts/setup_zwave.sh
     echo "Done."
     echo ' '
   fi
@@ -254,6 +256,89 @@ then
 fi
 
 
+# Checking ENV for multihost setup
+# Configuring objects db host
+if [ "$multihost" = "master" ] && [ "$objectsdbtype" = "" ] && [ "$objectsdbhost" = "" ] && [ "$objectsdbport" = "" ]
+then
+  echo "Multihost is set as \"master\" by ENV and no external objects db is set."
+  echo "Setting host of objects db to \"0.0.0.0\" to allow external communication..."
+    jq --arg objectsdbhost "0.0.0.0" '.objects.host = $objectsdbhost' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+  echo "Done."
+  echo ' '
+elif [ "$multihost" = "master" ] && [ "$objectsdbhost" = "127.0.0.1" ]
+then
+  echo "Multihost is set as \"master\" by ENV. But objects db host is set to \"127.0.0.1\" by ENV too."
+  echo "This configuration will not work! Please change or remove ENV \"IOB_OBJECTSDB_HOST\" and start over!"
+  echo "For more information see readme.md on Github (https://github.com/buanet/docker-iobroker)."
+  exit 1
+elif [ "$multihost" = "master" ] &&  [ "$objectsdbtype" != "" ] && [ "$objectsdbhost" != "" ] && [ "$objectsdbport" != "" ]
+then
+  echo "Multihost is set as \"master\" by ENV and external objects db is set."
+  echo "Skipping this step..."
+  echo "Done."
+  echo ' '
+elif ([ "$multihost" = "slave" ] && [ "$objectsdbtype" = "" ]) || ([ "$multihost" = "slave" ] && [ "$objectsdbhost" = "" ]) || ([ "$multihost" = "slave" ] && [ "$objectsdbport" = "" ])
+then
+  echo "Multihost is set as \"slave\" by ENV. But no external objects db is set."
+  echo "You have to configure ENVs \"IOB_OBJECTSDB_TYPE\", \"IOB_OBJECTSDB_HOST\" and \"IOB_OBJECTSDB_PORT\" to connect to a maser objects db."
+  echo "Please check your settings and start over."
+  echo "For more information see readme.md on Github (https://github.com/buanet/docker-iobroker)."
+  exit 1
+elif [ "$multihost" = "slave" ] && [ "$objectsdbtype" != "" ] && [ "$objectsdbhost" != "" ] && [ "$objectsdbport" != "" ]
+then
+  echo "Multihost is set as \"slave\" by ENV and external objects db is set."
+  echo "Skipping this step..."
+  echo "Done."
+  echo ' '
+elif [ "$multihost" != "" ]
+then
+  echo "Multihost is set but it seems like some configuration is missing."
+  echo "Please checke if you have configured the ENVs \"MULTIHOST\", \"IOB_OBJECTSDB_TYPE\", \"IOB_OBJECTSDB_HOST\" and \"IOB_OBJECTSDB_PORT\" correctly and start over."
+  echo "For more information see readme.md on Github (https://github.com/buanet/docker-iobroker)."
+  exit 1
+fi
+#Configuring states db host
+if [ "$multihost" = "master" ] && [ "$statesdbtype" = "" ] && [ "$statesdbhost" = "" ] && [ "$statesdbport" = "" ]
+then
+  echo "Multihost is set as \"master\" by ENV and no external states db is set."
+  echo "Setting host of states db to \"0.0.0.0\" to allow external communication..."
+    jq --arg statesdbhost "0.0.0.0" '.states.host = $statesdbhost' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+  echo "Done."
+  echo ' '
+elif [ "$multihost" = "master" ] && [ "$statesdbhost" = "127.0.0.1" ]
+then
+  echo "Multihost is set as \"master\" by ENV. But states db host is set to \"127.0.0.1\" by ENV too."
+  echo "This configuration will not work! Please change or remove ENV \"IOB_STATESDB_HOST\" and start over!"
+  echo "For more information see readme.md on Github (https://github.com/buanet/docker-iobroker)."
+  exit 1
+elif [ "$multihost" = "master" ] && [ "$statesdbtype" != "" ] && [ "$statesdbhost" != "" ] && [ "$statesdbport" != "" ]
+then
+  echo "Multihost is set as \"master\" by ENV and external states db is set."
+  echo "Skipping this step..."
+  echo "Done."
+  echo ' '
+elif ([ "$multihost" = "slave" ] && [ "$statesdbtype" = "" ]) || ([ "$multihost" = "slave" ] && [ "$statesdbhost" = "" ]) || ([ "$multihost" = "slave" ] && [ "$statesdbport" = "" ])
+then
+  echo "Multihost is set as \"slave\" by ENV. But no external states db is set."
+  echo "You have to configure ENVs \"IOB_STATESDB_TYPE\", \"IOB_STATESDB_HOST\" and \"IOB_STATESDB_PORT\" to connect to a maser states db."
+  echo "Please check your settings and start over."
+  echo "For more information see readme.md on Github (https://github.com/buanet/docker-iobroker)."
+  exit 1
+elif [ "$multihost" = "slave" ] && [ "$statesdbtype" != "" ] && [ "$statesdbhost" != "" ] && [ "$statesdbport" != "" ]
+then
+  echo "Multihost is set as \"slave\" by ENV and external states db is set."
+  echo "Skipping this step..."
+  echo "Done."
+  echo ' '
+elif [ "$multihost" != "" ]
+then
+  echo "Multihost is set but it seems like some configuration is missing."
+  echo "Please checke if you have configured the ENVs \"MULTIHOST\", \"IOB_STATESDB_TYPE\", \"IOB_STATESDB_HOST\" and \"IOB_STATESTDB_PORT\" correctly and start over."
+  echo "For more information see readme.md on Github (https://github.com/buanet/docker-iobroker)."
+  exit 1
+fi
+
+
 # Checking ENVs for custom setup of objects db
 if [ "$objectsdbtype" != "" ] || [ "$objectsdbhost" != "" ] || [ "$objectsdbport" != "" ]
 then
@@ -261,7 +346,7 @@ then
   then
     echo "ENV IOB_OBJECTSDB_TYPE is set and value is different from detected ioBroker installation."
     echo "Setting type of objects db to \""$objectsdbtype"\"..."
-    jq --arg objectsdbtype "$objectsdbtype" '.objects.type = $objectsdbtype' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+      jq --arg objectsdbtype "$objectsdbtype" '.objects.type = $objectsdbtype' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
     echo "Done."
   else
     echo "ENV IOB_OBJECTSDB_TYPE is set and value meets detected ioBroker installation. Nothing to do here."
@@ -270,7 +355,7 @@ then
   then
     echo "ENV IOB_OBJECTSDB_HOST is set and value is different from detected ioBroker installation."
     echo "Setting host of objects db to \""$objectsdbhost"\"..."
-    jq --arg objectsdbhost "$objectsdbhost" '.objects.host = $objectsdbhost' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+      jq --arg objectsdbhost "$objectsdbhost" '.objects.host = $objectsdbhost' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
     echo "Done."
   else
     echo "ENV IOB_OBJECTSDB_HOST is set and value meets detected ioBroker installation. Nothing to do here."
@@ -279,7 +364,7 @@ then
   then
     echo "ENV IOB_OBJECTSDB_PORT is set and value is different from detected ioBroker installation."
     echo "Setting port of objects db to \""$objectsdbport"\"..."
-    jq --arg objectsdbport "$objectsdbport" '.objects.port = $objectsdbport' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+      jq --arg objectsdbport "$objectsdbport" '.objects.port = $objectsdbport' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
     echo "Done."
   else
     echo "ENV IOB_OBJECTSDB_PORT is set and value meets detected ioBroker installation. Nothing to do here."
@@ -295,7 +380,7 @@ then
   then
     echo "ENV IOB_STATESDB_TYPE is set and value is different from detected ioBroker installation."
     echo "Setting type of states db to \""$statesdbtype"\"..."
-    jq --arg statesdbtype "$statesdbtype" '.states.type = $statesdbtype' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+      jq --arg statesdbtype "$statesdbtype" '.states.type = $statesdbtype' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
     echo "Done."
   else
     echo "ENV IOB_STATESDB_TYPE is set and value meets detected ioBroker installation. Nothing to do here."
@@ -304,7 +389,7 @@ then
   then
     echo "ENV IOB_STATESDB_HOST is set and value is different from detected ioBroker installation."
     echo "Setting host of states db to \""$statesdbhost"\"..."
-    jq --arg statesdbhost "$statesdbhost" '.states.host = $statesdbhost' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+      jq --arg statesdbhost "$statesdbhost" '.states.host = $statesdbhost' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
     echo "Done."
   else
     echo "ENV IOB_STATESDB_HOST is set and value meets detected ioBroker installation. Nothing to do here."
@@ -313,7 +398,7 @@ then
   then
     echo "ENV IOB_STATESDB_PORT is set and value is different from detected ioBroker installation."
     echo "Setting port of states db to \""$statesdbport"\"..."
-    jq --arg statesdbport "$statesdbport" '.states.port = $statesdbport' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
+      jq --arg statesdbport "$statesdbport" '.states.port = $statesdbport' /opt/iobroker/iobroker-data/iobroker.json > /opt/iobroker/iobroker-data/iobroker.json.tmp && mv /opt/iobroker/iobroker-data/iobroker.json.tmp /opt/iobroker/iobroker-data/iobroker.json
     echo "Done."
   else
     echo "ENV IOB_STATESDB_PORT is set and value meets detected ioBroker installation. Nothing to do here."
@@ -326,9 +411,9 @@ fi
 if [ `find /opt/userscripts -type f | wc -l` -lt 1 ]
 then
   echo "There is no data detected in /opt/userscripts. Restoring exapmple userscripts..."
-  tar -xf /opt/initial_userscripts.tar -C /
-  chmod 755 /opt/userscripts/userscript_firststart_example.sh
-  chmod 755 /opt/userscripts/userscript_everystart_example.sh
+    tar -xf /opt/initial_userscripts.tar -C /
+    chmod 755 /opt/userscripts/userscript_firststart_example.sh
+    chmod 755 /opt/userscripts/userscript_everystart_example.sh
   echo "Done."
   echo ' '
 elif [ -f /opt/userscripts/userscript_firststart.sh ] || [ -f /opt/userscripts/userscript_everystart.sh ]
@@ -337,26 +422,23 @@ then
   then
     echo "Userscript for first start detected and this is the first start of a new container."
     echo "Running userscript_firststart.sh..."
-    chmod 755 /opt/userscripts/userscript_firststart.sh
-    bash /opt/userscripts/userscript_firststart.sh
-    rm -f /opt/.firstrun
+      chmod 755 /opt/userscripts/userscript_firststart.sh
+      bash /opt/userscripts/userscript_firststart.sh
+      rm -f /opt/.firstrun
     echo "Done."
     echo ' '
   fi
   if [ -f /opt/userscripts/userscript_everystart.sh ]
   then
     echo "Userscript for every start detected. Running userscript_everystart.sh..."
-    chmod 755 /opt/userscripts/userscript_everystart.sh
-    bash /opt/userscripts/userscript_everystart.sh
+      chmod 755 /opt/userscripts/userscript_everystart.sh
+      bash /opt/userscripts/userscript_everystart.sh
     echo "Done."
     echo ' '
   fi
 fi
 
 
-sleep 5
-
-
 #####
 # Starting ioBroker
 #####
@@ -367,7 +449,21 @@ echo ' '
 echo "Starting ioBroker..."
 echo ' '
 
-gosu iobroker node node_modules/iobroker.js-controller/controller.js
+# Function for graceful shutdown by SIGTERM signal
+shut_down() {
+  echo ' '
+  echo "Recived termination signal (SIGTERM)."
+  echo "Shutting down ioBroker..."
+  pid=$(ps -ef | awk '/[j]s.controller/{print $2}')
+  kill -SIGTERM "$pid"
+  exit
+}
 
-# Preventing container restart by keeping a process alive even if iobroker will be stopped
+# Trap to get signal for graceful shutdown
+trap 'shut_down' SIGTERM
+
+# IoBroker start
+gosu iobroker node node_modules/iobroker.js-controller/controller.js & wait
+
+# Fallback process for keeping container running when ioBroker is stopped for maintenance (e.g. js-controller update)
 tail -f /dev/null