diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bfb59d0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.swp
+conf/*.conf
diff --git a/README.install b/README.install
index e66fb1d..49e9d01 100644
--- a/README.install
+++ b/README.install
@@ -14,6 +14,7 @@
 FQND_HOSTNAME="meet.oopen.de"
 FQND_HOSTNAME="meet2.oopen.de"
 FQND_HOSTNAME="meet.faire-mobilitaet.de"
+FQND_HOSTNAME="video.faire-mobilitaet.de"
 
 # 0.) Create new LX Container
 #
@@ -44,14 +45,77 @@ FQND_HOSTNAME="meet.faire-mobilitaet.de"
 #    cd /usr/local/src/nginx
 #    ./install_nginx.sh
 
+Adjust 'DefaultLimitNOFILE' file /etc/systemd/system.conf
+if ! $(grep -q -E "^\s*DefaultLimitNOFILE=" /etc/systemd/system.conf 2> /dev/null); then
+   perl -i -n -p -e "s/^(\s*#DefaultLimitNOFILE=.*)/\1\nDefaultLimitNOFILE=1048576/" \
+      /etc/systemd/system.conf
+elif ! $(grep -q -E "^\s*DefaultLimitNOFILE=1048576" /etc/systemd/system.conf 2> /dev/null); then
+   perl -i -n -p -e "s/^\s*DefaultLimitNOFILE=.*/DefaultLimitNOFILE=1048576/" \
+      /etc/systemd/system.conf
+fi
+
+Adjust 'DefaultLimitNPROC' file /etc/systemd/system.conf
+if ! $(grep -q -E "^\s*DefaultLimitNPROC=" /etc/systemd/system.conf 2> /dev/null); then
+   perl -i -n -p -e "s/^(\s*#DefaultLimitNPROC=.*)/\1\nDefaultLimitNPROC=1048576/" \
+      /etc/systemd/system.conf
+elif ! $(grep -q -E "^\s*DefaultLimitNPROC=1048576" /etc/systemd/system.conf 2> /dev/null); then
+   perl -i -n -p -e "s/^\s*DefaultLimitNPROC=.*/DefaultLimitNPROC=1048576/" \
+      /etc/systemd/system.conf
+fi
+
+Adjust 'DefaultTasksMax' file /etc/systemd/system.conf
+if ! $(grep -q -E "^\s*DefaultTasksMax=" /etc/systemd/system.conf 2> /dev/null); then
+   perl -i -n -p -e "s/^(\s*#DefaultTasksMax=.*)/\1\nDefaultTasksMax=1048576/" \
+      /etc/systemd/system.conf
+elif ! $(grep -q -E "^\s*DefaultTasksMax=1048576" /etc/systemd/system.conf 2> /dev/null); then
+   perl -i -n -p -e "s/^\s*DefaultTasksMax=.*/DefaultTasksMax=1048576/" \
+      /etc/systemd/system.conf
+fi
+
+Adjust 'DefaultLimitRTPRIO' file /etc/systemd/system.conf
+if ! $(grep -q -E "^\s*DefaultLimitRTPRIO=" /etc/systemd/system.conf 2> /dev/null); then
+   perl -i -n -p -e "s/^(\s*#DefaultLimitRTPRIO=.*)/\1\nDefaultLimitRTPRIO=infinity/" \
+      /etc/systemd/system.conf
+elif ! $(grep -q -E "^\s*DefaultLimitRTPRIO=infinity" /etc/systemd/system.conf 2> /dev/null); then
+   perl -i -n -p -e "s/^\s*DefaultLimitRTPRIO=.*/DefaultLimitRTPRIO=infinity/" \
+      /etc/systemd/system.conf
+fi
+
+Adjust 'DefaultLimitRTTIME' file /etc/systemd/system.conf
+if ! $(grep -q -E "^\s*DefaultLimitRTTIME=" /etc/systemd/system.conf 2> /dev/null); then
+   perl -i -n -p -e "s/^(\s*#DefaultLimitRTTIME=.*)/\1\nDefaultLimitRTTIME=infinity/" \
+      /etc/systemd/system.conf
+elif ! $(grep -q -E "^\s*DefaultLimitRTTIME=infinity" /etc/systemd/system.conf 2> /dev/null); then
+   perl -i -n -p -e "s/^\s*DefaultLimitRTTIME=.*/DefaultLimitRTTIME=infinity/" \
+      /etc/systemd/system.conf
+fi
+
+Adjust 'DefaultLimitCORE' file /etc/systemd/system.conf
+if ! $(grep -q -E "^\s*DefaultLimitCORE=" /etc/systemd/system.conf 2> /dev/null); then
+   perl -i -n -p -e "s/^(\s*#DefaultLimitCORE=.*)/\1\nDefaultLimitCORE=infinity/" \
+      /etc/systemd/system.conf
+elif ! $(grep -q -E "^\s*DefaultLimitCORE=infinity" /etc/systemd/system.conf 2> /dev/null); then
+   perl -i -n -p -e "s/^\s*DefaultLimitCORE=.*/DefaultLimitCORE=infinity/" \
+      /etc/systemd/system.conf
+fi
+
+
+systemctl daemon-reload
+
+
 # 5.) Install 'dehydrated-cron' (Let's Encrypt Certificates)
 #
-#    cd /usr/local/src/dehydrated-cron
-#    ./install_dehydrated.sh
+# Install Let's Encrypt Certificate
+#
+/usr/local/src/dehydrated-cron/install_dehydrated.sh
+
+# Adjust '/var/lib/dehydrated/domains.txt'
+#
 cat <<EOF >> /var/lib/dehydrated/domains.txt
 $FQND_HOSTNAME
 EOF
 
+
 # Generate Certificate
 #
 /var/lib/dehydrated/cron/dehydrated_cron.sh
@@ -103,6 +167,9 @@ apt-get update
 apt-get install jitsi-meet
 
 
+# !! Adjust nginx configuration !!
+
+
 # Maybe reinstall of 'jitsi-meet-turnserver' is needed..
 #
 # Note: not needed if 'unstable' packages are installed.
@@ -111,8 +178,6 @@ apt-get install jitsi-meet
 #   apt-get install --reinstall jitsi-meet-turnserver
 #fi
 
-
-
 cd /etc/nginx/modules-enabled
 
 # for streamin at leas module 'ngx_stream_module.so' is needed
@@ -131,10 +196,6 @@ for _file in $(ls /usr/share/nginx/modules-available/) ; do
    echo $_file
 done
 
-# Install Let's Encrypt Certificate
-#
-/usr/local/src/dehydrated-cron/install_dehydrated.sh
-
 
 # Addjust file nginx vhost congiguration '/etc/nginx/sites-enabled/${FQND_HOSTNAME}.conf'
 #
@@ -189,7 +250,7 @@ fi
 
 # Prepare configuration file for 'check_string_ps'
 #
-if ! $(grep -q -E "^\s*check_string_ps=\"[[:digit:]]\\ /usr/bin/turnserver\"" \
+if ! $(grep -q -E "^\s*check_string_ps=\"\[\[:digit:\]\]\\\ /usr/bin/turnserver\"" \
 	    /root/bin/monitoring/conf/check_cert_for_service.conf 2> /dev/null) ; then
 	perl -i -n -p -e "s/^(#check_string_ps*)/#\1\ncheck_string_ps=\"[[:digit:]]\\\ \/usr\/bin\/turnserver\"/" \
 		/root/bin/monitoring/conf/check_cert_for_service.conf
diff --git a/conf/jitsi.conf.sample b/conf/jitsi.conf.sample
new file mode 100644
index 0000000..16df7fe
--- /dev/null
+++ b/conf/jitsi.conf.sample
@@ -0,0 +1,13 @@
+#-----------------------------------
+# Settings for Jitsi Install scripts
+#-----------------------------------
+
+# FQHN_HOSTNAME
+#
+# The full qualified histname under which bbb service
+# is available
+#
+# Defaults to full qualified hostname of the system
+#
+FQHN_HOSTNAME=""
+
diff --git a/jitsi-post-install.sh b/jitsi-post-install.sh
new file mode 100755
index 0000000..87a6fe0
--- /dev/null
+++ b/jitsi-post-install.sh
@@ -0,0 +1,805 @@
+#!/usr/bin/env bash
+  
+script_name="$(basename $(realpath $0))"
+working_dir="$(dirname $(realpath $0))"
+
+#conf_file="${working_dir}/conf/${script_name%%.*}.conf"
+conf_file="${working_dir}/conf/jitsi.conf"
+
+LOCK_DIR="/tmp/$(basename $0).$$.LOCK"
+log_file="${LOCK_DIR}/${script_name%%.*}.log"
+
+
+# ----------
+# Base Function(s)
+# ----------
+
+clean_up() {
+
+   # Perform program exit housekeeping
+   rm -rf "$LOCK_DIR"
+   blank_line
+   exit $1
+}
+
+echononl(){
+   if $terminal ; then
+      echo X\\c > /tmp/shprompt$$
+      if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
+         echo -e -n "   $*\\c" 1>&2
+      else
+         echo -e -n "   $*" 1>&2
+      fi
+      rm /tmp/shprompt$$
+   fi
+}
+fatal(){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mFatal\033[m ] $*"
+   else
+      echo -e "   [ Fatal ] $*"
+   fi
+   echo ""
+   if $terminal ; then
+      echo -e "             \033[1mScript terminated\033[m.."
+   else
+      echo -e "             Script terminated.."
+   fi
+   echo ""
+   rm -rf $LOCK_DIR
+   exit 1
+}
+error (){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mError\033[m ] $*"
+   else
+      echo "   [ Error ] $*"
+   fi
+   echo ""
+}
+
+echo_ok() {
+   if $terminal ; then
+      echo -e "\033[85G[ \033[32mok\033[m ]"
+   fi
+}
+echo_failed(){
+   if $terminal ; then
+      echo -e "\033[85G[ \033[1;31mfailed\033[m ]"
+   fi
+}
+echo_skipped() {
+   if $terminal ; then
+      echo -e "\033[85G[ \033[33m\033[1mskipped\033[m ]"
+   fi
+}
+echo_wait(){
+   if $terminal ; then
+      echo -en "\033[85G[ \033[5m\033[1m..\033[m ]"
+   fi
+}
+
+trim() {
+    local var="$*"
+    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
+    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
+    echo -n "$var"
+}
+
+blank_line() {
+   if $terminal ; then
+      echo ""
+   fi
+}
+
+detect_os () {
+
+   if $(which lsb_release > /dev/null 2>&1) ; then
+
+      DIST="$(lsb_release -i | awk '{print tolower($3)}')"
+      DIST_VERSION="$(lsb_release -r | awk '{print tolower($2)}')"
+      DIST_CODENAME="$(lsb_release -c | awk '{print tolower($2)}')"
+
+      if [[ "$DIST" = "debian" ]]; then
+         if $(echo "$DIST_VERSION" | grep -q '\.') ; then
+            DIST_VERSION=$(echo "$DIST_VERSION" | cut --delimiter='.' -f1)
+         fi
+      fi
+
+   elif [[ -e "/etc/os-release" ]]; then
+
+      . /etc/os-release
+
+      DIST=$ID
+      DIST_VERSION=${VERSION_ID}
+
+   fi
+
+   # remove whitespace from DIST and DIST_VERSION
+   DIST="${DIST// /}"
+   DIST_VERSION="${DIST_VERSION// /}"
+
+}
+
+
+
+# ----------
+# - Jobhandling
+# ----------
+
+# - Run 'clean_up' for signals SIGHUP SIGINT SIGTERM
+# -
+trap clean_up SIGHUP SIGINT SIGTERM
+
+# - Create lock directory '$LOCK_DIR"
+#
+mkdir "$LOCK_DIR"
+
+
+# ----------
+# - Some checks ..
+# ----------
+
+# - Running in a terminal?
+# -
+if [[ -t 1 ]] ; then
+   terminal=true
+else
+   fatal "Script must run in a terminal."
+fi
+
+
+# ==========
+# - Begin Main Script
+# ==========
+
+# ----------
+# - Headline
+# ----------
+
+if $terminal ; then
+   echo ""
+   echo -e "\033[1m----------\033[m"
+   echo -e "\033[32m\033[1mRunning script \033[m\033[1m$script_name\033[32m .. \033[m"
+   echo -e "\033[1m----------\033[m"
+fi
+
+
+# ----------
+#  Read Configurations from $conf_file
+# ----------
+
+
+# - Give your default values here
+# -
+DEFAULT_FQHN_HOSTNAME="$(hostname -f)"
+
+if [[ -f "$conf_file" ]]; then
+   source "$conf_file"
+else
+   warn "No configuration file '$conf_file' present.\n
+             Loading default values.."
+fi
+
+[[ -n "$FQHN_HOSTNAME" ]] && DEFAULT_FQHN_HOSTNAME="$FQHN_HOSTNAME"
+
+
+blank_line
+echononl "Detect distribution/release of running OS.."
+detect_os > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+	echo_failed
+	error "$(cat "$log_file")"
+else
+	echo_ok
+fi
+
+
+FQHN_HOSTNAME=
+echo ""
+echo -e "\033[32m--\033[m"
+echo ""
+echo "Insert full qualified hostname for BigBlueButton Service"
+echo ""
+if [[ -n "$DEFAULT_FQHN_HOSTNAME" ]]; then
+   while [[ "X${FQHN_HOSTNAME}" = "X" ]]; do
+      echononl "Full qualified hostname [${DEFAULT_FQHN_HOSTNAME}]: "
+      read FQHN_HOSTNAME
+      if [[ "X${FQHN_HOSTNAME}" = "X" ]]; then
+         FQHN_HOSTNAME=$DEFAULT_FQHN_HOSTNAME
+      fi
+      if [[ ! $FQHN_HOSTNAME =~ \. ]]; then
+         echo -e "\n\tGiven Host \033[33m\033[1m$FQHN_HOSTNAME\033[m seems not to be a full qualified hostname.\n"
+         FQHN_HOSTNAME=""
+      fi
+   done
+else
+   while [[ "X${FQHN_HOSTNAME}" = "X" ]]; do
+      echononl "Full qualified hostname: "
+      read FQHN_HOSTNAME
+      if [[ "X${FQHN_HOSTNAME}" = "X" ]]; then
+         echo -e "\n\t\033[33m\033[1mFull qualified hostname is reqired\033[m\n"
+      fi
+      if [[ ! $FQHN_HOSTNAME =~ \. ]]; then
+         echo -e "\n\tGiven Host \033[33m\033[1m$FQHN_HOSTNAME\033[m seems not to be a full qualified hostname.\n"
+         FQHN_HOSTNAME=""
+      fi
+   done
+fi
+HOSTNAME="${FQHN_HOSTNAME%%.*}"
+
+echo ""
+echo ""
+echo -e "\t\033[32mStart pre-install script for BigBlueButton Service with the following parameters\033[m"
+echo ""
+echo -e "\tFull qualified Hostname..: $FQHN_HOSTNAME"
+echo -e "\tHostname.................: $HOSTNAME"
+echo ""
+echo -e "\tOS Distribution..........: $DIST"
+echo -e "\tDistribution's codename..: $DIST_CODENAME"
+echo ""
+echononl "einverstanden (yes/no): "
+read OK
+OK=${OK,,}
+while [ "X$OK" != "Xyes" -a "X$OK" != "Xno" ]; do
+   echononl "Wrong entry! [yes/no]: "
+   read OK
+   OK=${OK,,}
+done
+[ $OK = "yes" ] || fatal Repeat with other settings..
+
+echo ""
+echo ""
+
+
+echo
+echo -e "\033[37m\033[1mInstall script checking if certificate/key of coTURN service is up-to-date..\033[m"
+echo
+
+
+# ------
+# Create configuration file for certification check of coTURN service
+# ------
+
+echononl "Create configuration file for certification check of coTURN service.."
+if [[ ! -f "/root/bin/monitoring/conf/check_cert_for_service.conf" ]]; then
+   cp /root/bin/monitoring/conf/check_cert_for_service.conf.sample \
+      /root/bin/monitoring/conf/check_cert_for_service.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+
+echononl "Prepare configuration file for 'service_name'.."
+if ! $(grep -q -E "^\s*service_name=\"coTURN\"" /root/bin/monitoring/conf/check_cert_for_service.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#service_name.*)/#\1\nservice_name=\"coTURN\"/" \
+      /root/bin/monitoring/conf/check_cert_for_service.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+
+echononl "Prepare configuration file for 'check_string_ps'.."
+if ! $(grep -q -E "^\s*check_string_ps=\"\[\[:digit:\]\]\\\ /usr/bin/turnserver\"" \
+       /root/bin/monitoring/conf/check_cert_for_service.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#+check_string_ps*)/#\1\ncheck_string_ps=\"[[:digit:]]\\\ \/usr\/bin\/turnserver\"/" \
+      /root/bin/monitoring/conf/check_cert_for_service.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+echononl "Prepare configuration file for 'service_user'.."
+if ! $(grep -q -E "^\s*service_user=\"turnserver\"" \
+       /root/bin/monitoring/conf/check_cert_for_service.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#+service_user.*)/#\1\nservice_user=\"turnserver\"/" \
+      /root/bin/monitoring/conf/check_cert_for_service.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+
+echononl "Prepare configuration file for 'service_group'.."
+if ! $(grep -q -E "^\s*service_group=\"turnserver\"" \
+       /root/bin/monitoring/conf/check_cert_for_service.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#+service_group.*)/#\1\nservice_group=\"turnserver\"/" \
+      /root/bin/monitoring/conf/check_cert_for_service.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+
+echononl "Prepare configuration file for 'cert_installed'.."
+#
+if ! $(grep -q -E "^\s*cert_installed=\"/etc/ssl/fullchain.pem\"" \
+       /root/bin/monitoring/conf/check_cert_for_service.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#+cert_installed.*)/#\1\ncert_installed=\"\/etc\/ssl\/fullchain.pem\"/" \
+      /root/bin/monitoring/conf/check_cert_for_service.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+
+echononl "Prepare configuration file for 'key_installed'.."
+#
+if ! $(grep -q -E "^\s*key_installed=\"/etc/ssl/privkey.pem\"" \
+       /root/bin/monitoring/conf/check_cert_for_service.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#+key_installed.*)/#\1\nkey_installed=\"\/etc\/ssl\/privkey.pem\"/" \
+      /root/bin/monitoring/conf/check_cert_for_service.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+echononl "Prepare configuration file for 'cert_newest'.."
+#
+if ! $(grep -q -E "^\s*cert_newest=\"/var/lib/dehydrated/certs/${FQHN_HOSTNAME}/fullchain.pem\"" \
+       /root/bin/monitoring/conf/check_cert_for_service.conf 2> /dev/null) ; then
+   perl -i -n -p -e \
+      "s/^(#+cert_newest.*)/#\1\ncert_newest=\"\\/var\/lib\/dehydrated\/certs\/${FQHN_HOSTNAME}\/fullchain.pem\"/" \
+      /root/bin/monitoring/conf/check_cert_for_service.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+echononl "Prepare configuration file for 'key_newest'.."
+#
+if ! $(grep -q -E "^\s*key_newest=\"/var/lib/dehydrated/certs/${FQHN_HOSTNAME}/privkey.pem\"" \
+       /root/bin/monitoring/conf/check_cert_for_service.conf 2> /dev/null) ; then
+   perl -i -n -p -e \
+      "s/^(#+key_newest.*)/#\1\nkey_newest=\"\\/var\/lib\/dehydrated\/certs\/${FQHN_HOSTNAME}\/privkey.pem\"/" \
+      /root/bin/monitoring/conf/check_cert_for_service.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+blank_line
+
+echononl "Initial run of script 'check_cert_for_service.sh'.."
+echo_wait
+/root/bin/monitoring//check_cert_for_service.sh  > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+else
+   echo_ok
+   if [[ -s "$log_file" ]] ; then
+      echo -e  "
+\033[32m----------\033[m
+\033[1mOutput from :run of script 'check_cert_for_service.sh' was:\033[m
+
+$(cat "$log_file")
+\033[32m----------\033[m
+"
+   fi
+fi
+
+blank_line
+
+# Add Cronjob for checcking if certificate/key of coTURN service is up to date
+#
+_failed=false
+echononl "Add Cronjob for checcking if certificate/key of coTURN service is up-to-date.."
+_crontab_tmp_file=/tmp/crontab_root.$$
+crontab -l > "$_crontab_tmp_file" 2> "$log_file"
+if [[ $? -ne 0 ]]; then
+   _failed=true
+fi
+
+if ! $(grep -q "/root/bin/monitoring/check_cert_for_service.sh" "$_crontab_tmp_file" 2>/dev/null) ; then
+   cat <<EOF >> "$_crontab_tmp_file" 2>> "$log_file"
+
+# - Check if cert for coTURN service is up-to-date
+# -
+39 05 * * * /root/bin/monitoring/check_cert_for_service.sh
+EOF
+   if [[ $? -ne 0 ]]; then
+      _failed=true
+   fi
+   crontab "$_crontab_tmp_file"
+   if [[ $? -ne 0 ]]; then
+      _failed=true
+   fi
+   rm -f "$_crontab_tmp_file"
+   if [[ $? -ne 0 ]]; then
+      _failed=true
+   fi
+
+   if $_failed ; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+
+else
+   echo_skipped
+fi
+
+blank_line
+
+echo
+echo -e "\033[37m\033[1mInstall script checking if certificate/key of Prosody service is up-to-date..\033[m"
+echo
+
+# ------
+# Create configuration file for certification check of Prosody service
+# ------
+
+echononl "Create configuration file for certification check of Prosody service.."
+if [[ ! -f "/root/bin/monitoring/conf/check_cert_for_prosody.conf" ]]; then
+   cp /root/bin/monitoring/conf/check_cert_for_prosody.conf.sample \
+      /root/bin/monitoring/conf/check_cert_for_prosody.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+
+echononl "Prepare configuration file for 'service_name'.."
+if ! $(grep -q -E "^\s*service_domain=\"${FQHN_HOSTNAME}\"" /root/bin/monitoring/conf/check_cert_for_prosody.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#service_domain.*)/#\1\nservice_domain=\"${FQHN_HOSTNAME}\"/" \
+      /root/bin/monitoring/conf/check_cert_for_prosody.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+if ! $(grep -q -E "^\s*service_name=\"Prosody\"" /root/bin/monitoring/conf/check_cert_for_prosody.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#+service_name.*)/#\1\nservice_name=\"Prosody\"/" \
+      /root/bin/monitoring/conf/check_cert_for_prosody.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+echononl "Prepare configuration file for 'check_string_ps'.."
+if ! $(grep -q -E "^\s*check_string_ps=\"\[\[:digit:\]\]\\\ lua\[\[:digit:\]\].\[\[:digit:\]\] /usr/bin/prosody\"" \
+       /root/bin/monitoring/conf/check_cert_for_prosody.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#+check_string_ps.*)/#\1\ncheck_string_ps=\"[[:digit:]]\\\ lua[[:digit:]].[[:digit:]] \/usr\/bin\/prosody\"/" \
+      /root/bin/monitoring/conf/check_cert_for_prosody.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+echononl "Prepare configuration file for 'service_user'.."
+if ! $(grep -q -E "^\s*service_user=\"prosody\"" \
+       /root/bin/monitoring/conf/check_cert_for_prosody.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#+service_user.*)/#\1\nservice_user=\"prosody\"/" \
+      /root/bin/monitoring/conf/check_cert_for_prosody.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+echononl "Prepare configuration file for 'service_group'.."
+if ! $(grep -q -E "^\s*service_group=\"prosody\"" \
+       /root/bin/monitoring/conf/check_cert_for_prosody.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#+service_group.*)/#\1\nservice_group=\"prosody\"/" \
+      /root/bin/monitoring/conf/check_cert_for_prosody.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+echononl "Prepare configuration file for 'cert_installed'.."
+if ! $(grep -q -E "^\s*cert_installed=\"/etc/prosody/certs/${FQHN_HOSTNAME}.crt\"" \
+       /root/bin/monitoring/conf/check_cert_for_prosody.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#+cert_installed.*)/#\1\ncert_installed=\"\/etc\/prosody\/certs\/${FQHN_HOSTNAME}.crt\"/" \
+      /root/bin/monitoring/conf/check_cert_for_prosody.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+echononl "Prepare configuration file for 'key_installed'.."
+if ! $(grep -q -E "^\s*key_installed=\"/etc/prosody/certs/${FQHN_HOSTNAME}.key\"" \
+       /root/bin/monitoring/conf/check_cert_for_prosody.conf 2> /dev/null) ; then
+   perl -i -n -p -e "s/^(#+key_installed.*)/#\1\nkey_installed=\"\/etc\/prosody\/certs\/${FQHN_HOSTNAME}.key\"/" \
+      /root/bin/monitoring/conf/check_cert_for_prosody.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+echononl "Prepare configuration file for 'cert_newest'.."
+if ! $(grep -q -E "^\s*cert_newest=\"/var/lib/dehydrated/certs/${FQHN_HOSTNAME}/fullchain.pem\"" \
+       /root/bin/monitoring/conf/check_cert_for_prosody.conf 2> /dev/null) ; then
+   perl -i -n -p -e \
+      "s/^(#+cert_newest.*)/#\1\ncert_newest=\"\\/var\/lib\/dehydrated\/certs\/${FQHN_HOSTNAME}\/fullchain.pem\"/" \
+      /root/bin/monitoring/conf/check_cert_for_prosody.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+echononl "Prepare configuration file for 'key_newest'.."
+if ! $(grep -q -E "^\s*key_newest=\"/var/lib/dehydrated/certs/${FQHN_HOSTNAME}/privkey.pem\"" \
+       /root/bin/monitoring/conf/check_cert_for_prosody.conf 2> /dev/null) ; then
+   perl -i -n -p -e \
+      "s/^(#+key_newest.*)/#\1\nkey_newest=\"\\/var\/lib\/dehydrated\/certs\/${FQHN_HOSTNAME}\/privkey.pem\"/" \
+      /root/bin/monitoring/conf/check_cert_for_prosody.conf > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+blank_line
+
+echononl "Initial run of script 'check_cert_for_prosody.sh'.."
+echo_wait
+/root/bin/monitoring/check_cert_for_prosody.sh  > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+else
+   echo_ok
+   if [[ -s "$log_file" ]] ; then
+      echo -e  "
+\033[32m----------\033[m
+\033[1mOutput from :run of script 'check_cert_for_prosody.sh' was:\033[m
+
+$(cat "$log_file")
+\033[32m----------\033[m
+"
+   fi
+fi
+
+blank_line
+
+# Add Cronjob for checcking if certificate/key of Prosody service is up to date
+#
+_failed=false
+echononl "Add Cronjob for checcking if certificate/key of Prosody service is up-to-date.."
+_crontab_tmp_file=/tmp/crontab_root.$$
+crontab -l > "$_crontab_tmp_file" 2> "$log_file"
+if [[ $? -ne 0 ]]; then
+   _failed=true
+fi
+
+if ! $(grep -q "/root/bin/monitoring/check_cert_for_prosody.sh" "$_crontab_tmp_file" 2>/dev/null) ; then
+   cat <<EOF >> "$_crontab_tmp_file" 2>> "$log_file"
+
+# - Check if cert(s) for Prosody service are up-zp-date
+# -
+13 05 * * * /root/bin/monitoring/check_cert_for_prosody.sh
+EOF
+   if [[ $? -ne 0 ]]; then
+      _failed=true
+   fi
+   crontab "$_crontab_tmp_file"
+   if [[ $? -ne 0 ]]; then
+      _failed=true
+   fi
+   rm -f "$_crontab_tmp_file"
+   if [[ $? -ne 0 ]]; then
+      _failed=true
+   fi
+
+   if $_failed ; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+
+else
+   echo_skipped
+fi
+
+blank_line
+
+echo
+echo -e "\033[37m\033[1mConfigure Jitsi Meet..\033[m"
+echo
+
+_failed=false
+_changed=false
+echononl "Adjust '/etc/jitsi/videobridge/sip-communicator.properties'.."
+if ! $(grep -q -E "^\s*org.jitsi.videobridge.DISABLE_TCP_HARVESTER=true" \
+       /etc/jitsi/videobridge/sip-communicator.properties 2> "$log_file") ; then
+cat <<EOF >> /etc/jitsi/videobridge/sip-communicator.properties
+
+# disable the built-in webserver (required)
+org.jitsi.videobridge.DISABLE_TCP_HARVESTER=true
+EOF
+   if [[ $? -ne 0 ]]; then
+      _failed=true
+   fi
+   _changed=true
+fi
+   
+
+if ! $(grep -q -E "^\s*org.jitsi.videobridge.TCP_HARVESTER_PORT=4443" \
+       /etc/jitsi/videobridge/sip-communicator.properties 2> "$log_file") ; then
+cat <<EOF >> /etc/jitsi/videobridge/sip-communicator.properties
+# sometimes the above setting does not work, therefore we change the port too (required)
+org.jitsi.videobridge.TCP_HARVESTER_PORT=4443
+# sometimes the above setting does not work, therefore we change the port too (required)
+org.jitsi.videobridge.TCP_HARVESTER_MAPPED_PORT=443
+EOF
+   if [[ $? -ne 0 ]]; then
+      _failed=true
+   fi
+   _changed=true
+fi
+
+if ! $(grep -q -E "^\s*#+org.jitsi.videobridge.ENABLE_STATISTICS=false" \
+       /etc/jitsi/videobridge/sip-communicator.properties 2> "$log_file") ; then
+cat <<EOF >> /etc/jitsi/videobridge/sip-communicator.properties
+# disable statistics to third parties (optional)
+# DOES NOT WORK
+#org.jitsi.videobridge.ENABLE_STATISTICS=false
+EOF
+   if [[ $? -ne 0 ]]; then
+      _failed=true
+   fi
+   _changed=true
+fi
+
+if $_changed ; then
+
+   if $_failed; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+
+echononl "Adjust '/etc/jitsi/meet/${FQHN_HOSTNAME}-config.js'.."
+if ! $(grep -q -E "^\s*{ urls: 'stun.nextcloud.com:443' }" \
+       /etc/jitsi/meet/${FQHN_HOSTNAME}-config.js 2> "$log_file") ; then
+   perl -i -n -p -e "s/((\s*)stunServers: \[.*)/\1\n\n\2    { urls: 'stun.nextcloud.com:443' },\n\2    { urls: 'stun.stunprotocol.org:3478' },\n\2    { urls: 'stun.services.mozilla.com:3478' },/" /etc/jitsi/meet/video.faire-mobilitaet.de-config.js
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+blank_line
+
+echo
+echo -e "\033[37m\033[1mRestart services..\033[m"
+echo
+
+echononl "Restart prosody service.."
+systemctl restart prosody > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+else
+   echo_ok
+fi
+
+echononl "Restart jicofo service.."
+systemctl restart prosody > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+else
+   echo_ok
+fi
+
+echononl "Restart jitsi-videobridge2 service.."
+systemctl restart jitsi-videobridge2 > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+else
+   echo_ok
+fi
+
+clean_up 0