diff --git a/advanced/01-pihole.conf b/advanced/01-pihole.conf
index e243e91a..02bc93bf 100644
--- a/advanced/01-pihole.conf
+++ b/advanced/01-pihole.conf
@@ -39,6 +39,4 @@ cache-size=@CACHE_SIZE@
 log-queries
 log-facility=/var/log/pihole.log
 
-local-ttl=2
-
 log-async
diff --git a/advanced/Scripts/update.sh b/advanced/Scripts/update.sh
index f833fc2f..dae04861 100755
--- a/advanced/Scripts/update.sh
+++ b/advanced/Scripts/update.sh
@@ -95,6 +95,10 @@ main() {
     # shellcheck disable=1090,2154
     source "${setupVars}"
 
+    # Install packages used by this installation script (necessary if users have removed e.g. git from their systems)
+    package_manager_detect
+    install_dependent_packages "${INSTALLER_DEPS[@]}"
+
     # This is unlikely
     if ! is_repo "${PI_HOLE_FILES_DIR}" ; then
         echo -e "\\n  ${COL_LIGHT_RED}Error: Core Pi-hole repo is missing from system!"
diff --git a/automated install/basic-install.sh b/automated install/basic-install.sh
index 34c0b4e7..e4c168ea 100755
--- a/automated install/basic-install.sh	
+++ b/automated install/basic-install.sh	
@@ -327,7 +327,7 @@ if is_command apt-get ; then
     # Packages required to perfom the os_check (stored as an array)
     OS_CHECK_DEPS=(grep dnsutils)
     # Packages required to run this install script (stored as an array)
-    INSTALLER_DEPS=(git "${iproute_pkg}" whiptail)
+    INSTALLER_DEPS=(git "${iproute_pkg}" whiptail ca-certificates)
     # Packages required to run Pi-hole (stored as an array)
     PIHOLE_DEPS=(cron curl iputils-ping lsof netcat psmisc sudo unzip idn2 sqlite3 libcap2-bin dns-root-data libcap2)
     # Packages required for the Web admin interface (stored as an array)
@@ -373,95 +373,12 @@ elif is_command rpm ; then
     PKG_INSTALL=("${PKG_MANAGER}" install -y)
     PKG_COUNT="${PKG_MANAGER} check-update | egrep '(.i686|.x86|.noarch|.arm|.src)' | wc -l"
     OS_CHECK_DEPS=(grep bind-utils)
-    INSTALLER_DEPS=(git iproute newt procps-ng which chkconfig)
+    INSTALLER_DEPS=(git iproute newt procps-ng which chkconfig ca-certificates)
     PIHOLE_DEPS=(cronie curl findutils nmap-ncat sudo unzip libidn2 psmisc sqlite libcap lsof)
     PIHOLE_WEB_DEPS=(lighttpd lighttpd-fastcgi php-common php-cli php-pdo php-xml php-json php-intl)
     LIGHTTPD_USER="lighttpd"
     LIGHTTPD_GROUP="lighttpd"
     LIGHTTPD_CFG="lighttpd.conf.fedora"
-    # If the host OS is Fedora,
-    if grep -qiE 'fedora|fedberry' /etc/redhat-release; then
-        # all required packages should be available by default with the latest fedora release
-        : # continue
-    # or if host OS is CentOS,
-    elif grep -qiE 'centos|scientific' /etc/redhat-release; then
-        # Pi-Hole currently supports CentOS 7+ with PHP7+
-        SUPPORTED_CENTOS_VERSION=7
-        SUPPORTED_CENTOS_PHP_VERSION=7
-        # Check current CentOS major release version
-        CURRENT_CENTOS_VERSION=$(grep -oP '(?<= )[0-9]+(?=\.?)' /etc/redhat-release)
-        # Check if CentOS version is supported
-        if [[ $CURRENT_CENTOS_VERSION -lt $SUPPORTED_CENTOS_VERSION ]]; then
-            printf "  %b CentOS %s is not supported.\\n" "${CROSS}" "${CURRENT_CENTOS_VERSION}"
-            printf "      Please update to CentOS release %s or later.\\n" "${SUPPORTED_CENTOS_VERSION}"
-            # exit the installer
-            exit
-        fi
-        # php-json is not required on CentOS 7 as it is already compiled into php
-        # verifiy via `php -m | grep json`
-        if [[ $CURRENT_CENTOS_VERSION -eq 7 ]]; then
-            # create a temporary array as arrays are not designed for use as mutable data structures
-            CENTOS7_PIHOLE_WEB_DEPS=()
-            for i in "${!PIHOLE_WEB_DEPS[@]}"; do
-                if [[ ${PIHOLE_WEB_DEPS[i]} != "php-json" ]]; then
-                    CENTOS7_PIHOLE_WEB_DEPS+=( "${PIHOLE_WEB_DEPS[i]}" )
-                fi
-            done
-            # re-assign the clean dependency array back to PIHOLE_WEB_DEPS
-            PIHOLE_WEB_DEPS=("${CENTOS7_PIHOLE_WEB_DEPS[@]}")
-            unset CENTOS7_PIHOLE_WEB_DEPS
-        fi
-        # CentOS requires the EPEL repository to gain access to Fedora packages
-        EPEL_PKG="epel-release"
-        rpm -q ${EPEL_PKG} &> /dev/null || rc=$?
-        if [[ $rc -ne 0 ]]; then
-            printf "  %b Enabling EPEL package repository (https://fedoraproject.org/wiki/EPEL)\\n" "${INFO}"
-            "${PKG_INSTALL[@]}" ${EPEL_PKG} &> /dev/null
-            printf "  %b Installed %s\\n" "${TICK}" "${EPEL_PKG}"
-        fi
-
-        # The default php on CentOS 7.x is 5.4 which is EOL
-        # Check if the version of PHP available via installed repositories is >= to PHP 7
-        AVAILABLE_PHP_VERSION=$("${PKG_MANAGER}" info php | grep -i version | grep -o '[0-9]\+' | head -1)
-        if [[ $AVAILABLE_PHP_VERSION -ge $SUPPORTED_CENTOS_PHP_VERSION ]]; then
-            # Since PHP 7 is available by default, install via default PHP package names
-            : # do nothing as PHP is current
-        else
-            REMI_PKG="remi-release"
-            REMI_REPO="remi-php72"
-            rpm -q ${REMI_PKG} &> /dev/null || rc=$?
-        if [[ $rc -ne 0 ]]; then
-            # The PHP version available via default repositories is older than version 7
-            if ! whiptail --defaultno --title "PHP 7 Update (recommended)" --yesno "PHP 7.x is recommended for both security and language features.\\nWould you like to install PHP7 via Remi's RPM repository?\\n\\nSee: https://rpms.remirepo.net for more information" "${r}" "${c}"; then
-                # User decided to NOT update PHP from REMI, attempt to install the default available PHP version
-                printf "  %b User opt-out of PHP 7 upgrade on CentOS. Deprecated PHP may be in use.\\n" "${INFO}"
-                : # continue with unsupported php version
-            else
-                printf "  %b Enabling Remi's RPM repository (https://rpms.remirepo.net)\\n" "${INFO}"
-                "${PKG_INSTALL[@]}" "https://rpms.remirepo.net/enterprise/${REMI_PKG}-$(rpm -E '%{rhel}').rpm" &> /dev/null
-                # enable the PHP 7 repository via yum-config-manager (provided by yum-utils)
-                "${PKG_INSTALL[@]}" "yum-utils" &> /dev/null
-                yum-config-manager --enable ${REMI_REPO} &> /dev/null
-                printf "  %b Remi's RPM repository has been enabled for PHP7\\n" "${TICK}"
-                # trigger an install/update of PHP to ensure previous version of PHP is updated from REMI
-                if "${PKG_INSTALL[@]}" "php-cli" &> /dev/null; then
-                    printf "  %b PHP7 installed/updated via Remi's RPM repository\\n" "${TICK}"
-                else
-                    printf "  %b There was a problem updating to PHP7 via Remi's RPM repository\\n" "${CROSS}"
-                    exit 1
-                fi
-            fi
-        fi
-    fi
-    else
-        # Warn user of unsupported version of Fedora or CentOS
-        if ! whiptail --defaultno --title "Unsupported RPM based distribution" --yesno "Would you like to continue installation on an unsupported RPM based distribution?\\n\\nPlease ensure the following packages have been installed manually:\\n\\n- lighttpd\\n- lighttpd-fastcgi\\n- PHP version 7+" "${r}" "${c}"; then
-            printf "  %b Aborting installation due to unsupported RPM based distribution\\n" "${CROSS}"
-            exit
-        else
-            printf "  %b Continuing installation with unsupported RPM based distribution\\n" "${INFO}"
-        fi
-    fi
 
 # If neither apt-get or yum/dnf package managers were found
 else
@@ -472,6 +389,90 @@ else
 fi
 }
 
+select_rpm_php(){
+# If the host OS is Fedora,
+if grep -qiE 'fedora|fedberry' /etc/redhat-release; then
+    # all required packages should be available by default with the latest fedora release
+    : # continue
+# or if host OS is CentOS,
+elif grep -qiE 'centos|scientific' /etc/redhat-release; then
+    # Pi-Hole currently supports CentOS 7+ with PHP7+
+    SUPPORTED_CENTOS_VERSION=7
+    SUPPORTED_CENTOS_PHP_VERSION=7
+    # Check current CentOS major release version
+    CURRENT_CENTOS_VERSION=$(grep -oP '(?<= )[0-9]+(?=\.?)' /etc/redhat-release)
+    # Check if CentOS version is supported
+    if [[ $CURRENT_CENTOS_VERSION -lt $SUPPORTED_CENTOS_VERSION ]]; then
+        printf "  %b CentOS %s is not supported.\\n" "${CROSS}" "${CURRENT_CENTOS_VERSION}"
+        printf "      Please update to CentOS release %s or later.\\n" "${SUPPORTED_CENTOS_VERSION}"
+        # exit the installer
+        exit
+    fi
+    # php-json is not required on CentOS 7 as it is already compiled into php
+    # verifiy via `php -m | grep json`
+    if [[ $CURRENT_CENTOS_VERSION -eq 7 ]]; then
+        # create a temporary array as arrays are not designed for use as mutable data structures
+        CENTOS7_PIHOLE_WEB_DEPS=()
+        for i in "${!PIHOLE_WEB_DEPS[@]}"; do
+            if [[ ${PIHOLE_WEB_DEPS[i]} != "php-json" ]]; then
+                CENTOS7_PIHOLE_WEB_DEPS+=( "${PIHOLE_WEB_DEPS[i]}" )
+            fi
+        done
+        # re-assign the clean dependency array back to PIHOLE_WEB_DEPS
+        PIHOLE_WEB_DEPS=("${CENTOS7_PIHOLE_WEB_DEPS[@]}")
+        unset CENTOS7_PIHOLE_WEB_DEPS
+    fi
+    # CentOS requires the EPEL repository to gain access to Fedora packages
+    EPEL_PKG="epel-release"
+    rpm -q ${EPEL_PKG} &> /dev/null || rc=$?
+    if [[ $rc -ne 0 ]]; then
+        printf "  %b Enabling EPEL package repository (https://fedoraproject.org/wiki/EPEL)\\n" "${INFO}"
+        "${PKG_INSTALL[@]}" ${EPEL_PKG} &> /dev/null
+        printf "  %b Installed %s\\n" "${TICK}" "${EPEL_PKG}"
+    fi
+
+    # The default php on CentOS 7.x is 5.4 which is EOL
+    # Check if the version of PHP available via installed repositories is >= to PHP 7
+    AVAILABLE_PHP_VERSION=$("${PKG_MANAGER}" info php | grep -i version | grep -o '[0-9]\+' | head -1)
+    if [[ $AVAILABLE_PHP_VERSION -ge $SUPPORTED_CENTOS_PHP_VERSION ]]; then
+        # Since PHP 7 is available by default, install via default PHP package names
+        : # do nothing as PHP is current
+    else
+        REMI_PKG="remi-release"
+        REMI_REPO="remi-php72"
+        rpm -q ${REMI_PKG} &> /dev/null || rc=$?
+    if [[ $rc -ne 0 ]]; then
+        # The PHP version available via default repositories is older than version 7
+        if ! whiptail --defaultno --title "PHP 7 Update (recommended)" --yesno "PHP 7.x is recommended for both security and language features.\\nWould you like to install PHP7 via Remi's RPM repository?\\n\\nSee: https://rpms.remirepo.net for more information" "${r}" "${c}"; then
+            # User decided to NOT update PHP from REMI, attempt to install the default available PHP version
+            printf "  %b User opt-out of PHP 7 upgrade on CentOS. Deprecated PHP may be in use.\\n" "${INFO}"
+            : # continue with unsupported php version
+        else
+            printf "  %b Enabling Remi's RPM repository (https://rpms.remirepo.net)\\n" "${INFO}"
+            "${PKG_INSTALL[@]}" "https://rpms.remirepo.net/enterprise/${REMI_PKG}-$(rpm -E '%{rhel}').rpm" &> /dev/null
+            # enable the PHP 7 repository via yum-config-manager (provided by yum-utils)
+            "${PKG_INSTALL[@]}" "yum-utils" &> /dev/null
+            yum-config-manager --enable ${REMI_REPO} &> /dev/null
+            printf "  %b Remi's RPM repository has been enabled for PHP7\\n" "${TICK}"
+            # trigger an install/update of PHP to ensure previous version of PHP is updated from REMI
+            if "${PKG_INSTALL[@]}" "php-cli" &> /dev/null; then
+                printf "  %b PHP7 installed/updated via Remi's RPM repository\\n" "${TICK}"
+            else
+                printf "  %b There was a problem updating to PHP7 via Remi's RPM repository\\n" "${CROSS}"
+                exit 1
+            fi
+        fi
+    fi    # Warn user of unsupported version of Fedora or CentOS
+    if ! whiptail --defaultno --title "Unsupported RPM based distribution" --yesno "Would you like to continue installation on an unsupported RPM based distribution?\\n\\nPlease ensure the following packages have been installed manually:\\n\\n- lighttpd\\n- lighttpd-fastcgi\\n- PHP version 7+" "${r}" "${c}"; then
+        printf "  %b Aborting installation due to unsupported RPM based distribution\\n" "${CROSS}"
+        exit
+    else
+        printf "  %b Continuing installation with unsupported RPM based distribution\\n" "${INFO}"
+    fi
+fi
+fi
+}
+
 # A function for checking if a directory is a git repository
 is_repo() {
     # Use a named, local variable instead of the vague $1, which is the first argument passed to this function
@@ -1813,6 +1814,8 @@ finalExports() {
     echo "INSTALL_WEB_INTERFACE=${INSTALL_WEB_INTERFACE}"
     echo "LIGHTTPD_ENABLED=${LIGHTTPD_ENABLED}"
     echo "CACHE_SIZE=${CACHE_SIZE}"
+    echo "DNS_FQDN_REQUIRED=true"
+    echo "DNS_BOGUS_PRIV=true"
     }>> "${setupVars}"
     chmod 644 "${setupVars}"
 
@@ -2547,6 +2550,11 @@ main() {
     printf "  %b Checking for / installing Required dependencies for this install script...\\n" "${INFO}"
     install_dependent_packages "${INSTALLER_DEPS[@]}"
 
+    #In case of RPM based distro, select the proper PHP version
+    if [[ "$PKG_MANAGER" == "yum" || "$PKG_MANAGER" == "dnf" ]] ; then
+      select_rpm_php
+    fi
+
     # Check if SELinux is Enforcing
     checkSelinux
 
diff --git a/gravity.sh b/gravity.sh
index ff02e9f3..99d1bcda 100755
--- a/gravity.sh
+++ b/gravity.sh
@@ -122,7 +122,7 @@ gravity_swap_databases() {
   gravityBlocks=$(stat --format "%b" ${gravityDBfile})
   # Only keep the old database if available disk space is at least twice the size of the existing gravity.db.
   # Better be safe than sorry...
-  if [ "${availableBlocks}" -gt "$(("${gravityBlocks}" * 2))" ] && [ -f "${gravityDBfile}" ]; then
+  if [ "${availableBlocks}" -gt "$((gravityBlocks * 2))" ] && [ -f "${gravityDBfile}" ]; then
     echo -e "  ${TICK} The old database remains available."
     mv "${gravityDBfile}" "${gravityOLDfile}"
   else
diff --git a/test/test_automated_install.py b/test/test_automated_install.py
index 593c19d2..9938dd99 100644
--- a/test/test_automated_install.py
+++ b/test/test_automated_install.py
@@ -618,6 +618,7 @@ def test_package_manager_has_pihole_deps(Pihole):
     output = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     install_dependent_packages ${PIHOLE_DEPS[@]}
     ''')
 
@@ -631,6 +632,7 @@ def test_package_manager_has_web_deps(Pihole):
     output = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     install_dependent_packages ${PIHOLE_WEB_DEPS[@]}
     ''')
 
diff --git a/test/test_centos_7_support.py b/test/test_centos_7_support.py
index ed99231a..14f62637 100644
--- a/test/test_centos_7_support.py
+++ b/test/test_centos_7_support.py
@@ -12,6 +12,7 @@ def test_php_upgrade_default_optout_centos_eq_7(Pihole):
     package_manager_detect = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     ''')
     expected_stdout = info_box + (' User opt-out of PHP 7 upgrade on CentOS. '
                                   'Deprecated PHP may be in use.')
@@ -30,6 +31,7 @@ def test_php_upgrade_user_optout_centos_eq_7(Pihole):
     package_manager_detect = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     ''')
     expected_stdout = info_box + (' User opt-out of PHP 7 upgrade on CentOS. '
                                   'Deprecated PHP may be in use.')
@@ -48,6 +50,7 @@ def test_php_upgrade_user_optin_centos_eq_7(Pihole):
     package_manager_detect = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     ''')
     assert 'opt-out' not in package_manager_detect.stdout
     expected_stdout = info_box + (' Enabling Remi\'s RPM repository '
diff --git a/test/test_centos_8_support.py b/test/test_centos_8_support.py
index b8ad9607..bbdbb765 100644
--- a/test/test_centos_8_support.py
+++ b/test/test_centos_8_support.py
@@ -13,6 +13,7 @@ def test_php_upgrade_default_continue_centos_gte_8(Pihole):
     package_manager_detect = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     ''')
     unexpected_stdout = info_box + (' User opt-out of PHP 7 upgrade on CentOS.'
                                     ' Deprecated PHP may be in use.')
@@ -33,6 +34,7 @@ def test_php_upgrade_user_optout_skipped_centos_gte_8(Pihole):
     package_manager_detect = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     ''')
     unexpected_stdout = info_box + (' User opt-out of PHP 7 upgrade on CentOS.'
                                     ' Deprecated PHP may be in use.')
@@ -53,6 +55,7 @@ def test_php_upgrade_user_optin_skipped_centos_gte_8(Pihole):
     package_manager_detect = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     ''')
     assert 'opt-out' not in package_manager_detect.stdout
     unexpected_stdout = info_box + (' Enabling Remi\'s RPM repository '
diff --git a/test/test_centos_common_support.py b/test/test_centos_common_support.py
index 8412173d..0b36cbae 100644
--- a/test/test_centos_common_support.py
+++ b/test/test_centos_common_support.py
@@ -16,6 +16,7 @@ def test_release_supported_version_check_centos(Pihole):
     package_manager_detect = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     ''')
     expected_stdout = cross_box + (' CentOS 6 is not supported.')
     assert expected_stdout in package_manager_detect.stdout
@@ -30,6 +31,7 @@ def test_enable_epel_repository_centos(Pihole):
     package_manager_detect = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     ''')
     expected_stdout = info_box + (' Enabling EPEL package repository '
                                   '(https://fedoraproject.org/wiki/EPEL)')
@@ -54,6 +56,7 @@ def test_php_version_lt_7_detected_upgrade_default_optout_centos(Pihole):
     package_manager_detect = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     ''')
     expected_stdout = info_box + (' User opt-out of PHP 7 upgrade on CentOS. '
                                   'Deprecated PHP may be in use.')
@@ -78,6 +81,7 @@ def test_php_version_lt_7_detected_upgrade_user_optout_centos(Pihole):
     package_manager_detect = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     ''')
     expected_stdout = info_box + (' User opt-out of PHP 7 upgrade on CentOS. '
                                   'Deprecated PHP may be in use.')
@@ -102,6 +106,7 @@ def test_php_version_lt_7_detected_upgrade_user_optin_centos(Pihole):
     package_manager_detect = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     install_dependent_packages PIHOLE_WEB_DEPS[@]
     ''')
     expected_stdout = info_box + (' User opt-out of PHP 7 upgrade on CentOS. '
diff --git a/test/test_fedora_support.py b/test/test_fedora_support.py
index a2ac4c71..3ad84be5 100644
--- a/test/test_fedora_support.py
+++ b/test/test_fedora_support.py
@@ -6,6 +6,7 @@ def test_epel_and_remi_not_installed_fedora(Pihole):
     package_manager_detect = Pihole.run('''
     source /opt/pihole/basic-install.sh
     package_manager_detect
+    select_rpm_php
     ''')
     assert package_manager_detect.stdout == ''