add systemd service auto restart for nginx, php-fpm & redis

- for nginx, php-fpm and redis systemd services add support to auto restart their respective services if service fails, crashes or exists. Auto restart will trigger 5 seconds after service failure is detected. The following config files control the settings and if they are custom edited, ensure you do run command = systemctl daemon-reload afterwards

/etc/systemd/system/nginx.service.d/failure-restart.conf
/etc/systemd/system/php-fpm.service.d/failure-restart.conf
/etc/systemd/system/redis.service.d/failure-restart.conf

addons/redis-server-install.sh

@@ -115,6 +115,16 @@ ExecStart=/bin/sh -c "/usr/bin/echo 'never' > /sys/kernel/mm/transparent_hugepag
 WantedBy=multi-user.target
 EOF
 
+cat > "/etc/systemd/system/redis.service.d/failure-restart.conf" <<TDG
+[Unit]
+StartLimitIntervalSec=30
+StartLimitBurst=2
+
+[Service]
+Restart=on-failure
+RestartSec=5s
+TDG
+
 if [ -f /etc/systemd/system/disable-thp.service ]; then
   systemctl daemon-reload
   systemctl start disable-thp

inc/cpcheck.inc

@@ -14,6 +14,19 @@ if [[ "$CENTOS_NINE" = '9' || "$CENTOS_EIGHT" = '8' || "$CENTOS_SEVEN" = '7' ]]
 cat > "/etc/systemd/system/nginx.service.d/openfileslimit.conf" <<TDG
 [Service]
 LimitNOFILE=1048576
+TDG
+        systemctl daemon-reload
+    fi
+    if [[ "$CENTOS_NINE" = '9' || "$CENTOS_EIGHT" = '8' || "$CENTOS_SEVEN" = '7' ]] && [[ ! -f /etc/systemd/system/nginx.service.d/failure-restart.conf ]]; then
+        echo "setup /etc/systemd/system/nginx.service.d/failure-restart.conf"
+cat > "/etc/systemd/system/nginx.service.d/failure-restart.conf" <<TDG
+[Unit]
+StartLimitIntervalSec=30
+StartLimitBurst=2
+
+[Service]
+Restart=on-failure
+RestartSec=5s
 TDG
         systemctl daemon-reload
     fi

inc/nginx_install.inc

@@ -329,6 +329,19 @@ if [[ "$CENTOS_EIGHT" = '8' || "$CENTOS_NINE" = '9' ]] || [[ "$SWITCH_NGINX_SYST
 cat > "/etc/systemd/system/nginx.service.d/openfileslimit.conf" <<TDG
 [Service]
 LimitNOFILE=1048576
+TDG
+        systemctl daemon-reload
+    fi
+    if [[ "$CENTOS_NINE" = '9' || "$CENTOS_EIGHT" = '8' || "$CENTOS_SEVEN" = '7' ]] && [[ ! -f /etc/systemd/system/nginx.service.d/failure-restart.conf ]]; then
+        echo "setup /etc/systemd/system/nginx.service.d/failure-restart.conf"
+cat > "/etc/systemd/system/nginx.service.d/failure-restart.conf" <<TDG
+[Unit]
+StartLimitIntervalSec=30
+StartLimitBurst=2
+
+[Service]
+Restart=on-failure
+RestartSec=5s
 TDG
         systemctl daemon-reload
     fi

inc/php_upgrade.inc

@@ -1220,6 +1220,17 @@ sar_call
 
     if [[ "$CENTOS_SEVEN" -eq '7' || "$CENTOS_EIGHT" -eq '8' || "$CENTOS_NINE" -eq '9' ]] && [[ "$SWITCH_PHPFPM_SYSTEMD" = [yY] && -f "/usr/local/src/centminmod/tools/php-systemd.sh" && ! -f /usr/lib/systemd/system/php-fpm.service ]]; then
       /usr/local/src/centminmod/tools/php-systemd.sh fpm-systemd
+        if [ ! -f /etc/systemd/system/php-fpm.service.d/failure-restart.conf ]; then
+cat > "/etc/systemd/system/php-fpm.service.d/failure-restart.conf" <<TDG
+[Unit]
+StartLimitIntervalSec=30
+StartLimitBurst=2
+
+[Service]
+Restart=on-failure
+RestartSec=5s
+TDG
+        fi
     fi
     cmservice php-fpm restart
     if [ -f /usr/bin/journalctl ]; then

tools/php-systemd.sh

@@ -44,6 +44,17 @@ StartLimitBurst=50
 #CPUSchedulingPriority=99
 EOF
   fi
+        if [ ! -f /etc/systemd/system/php-fpm.service.d/failure-restart.conf ]; then
+cat > "/etc/systemd/system/php-fpm.service.d/failure-restart.conf" <<TDG
+[Unit]
+StartLimitIntervalSec=30
+StartLimitBurst=2
+
+[Service]
+Restart=on-failure
+RestartSec=5s
+TDG
+        fi
 
 CHECK_FPMSYSTEMD=$(php-config --configure-options | grep -o with-fpm-systemd)