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+[#]: collector: (lujun9972)
+[#]: translator: ( )
+[#]: reviewer: ( )
+[#]: publisher: ( )
+[#]: url: ( )
+[#]: subject: (Bash Script to Automatically Start a Services When it Goes Down on Linux)
+[#]: via: (https://www.2daygeek.com/linux-bash-script-auto-restart-services-when-down/)
+[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
+
+Bash Script to Automatically Start a Services When it Goes Down on Linux
+======
+
+There are many open source monitoring tools are currently available in market to monitor Linux systems performance.
+
+Those are send an email alert when the system reaches the specified threshold limit for CPU, Memory, and Disk space or any service is down.
+
+But, it doesn’t have an intelligence to auto start the services, if it crash/goes down.
+
+There are various reasons for the process to crash, which you can investigate and fix the issue but it may take a while.
+
+If you don’t want to make your service down for a while and if you would like to bring them up immediately whenever it goes down?
+
+If so, what to do in this situation? How to mitigate this?
+
+We can write our own bash script to start a service whenever it goes down. Writing a shell script is not a big deal and you have to understand few things to achieve this.
+
+Once you familiar on this, you can write your own shell script to automate the day to day activities, which will save lots of time.
+
+We had added many useful shell scripts in the past. If you want to check those, navigate to the below link.
+
+  * **[How to automate day to day activities using shell scripts?][1]**
+
+
+
+I have added totally six shell scripts for this usage and you can choose which one is suitable for you.
+
+I had applied different commands and methodology in each shell script.
+
+**`Note:`**` ` You need to change the email id instead of ours.
+
+### 1) How to Automatically Start a Service When it Goes Down on SysVinit Linux System?
+
+Use the following bash script, if you would like to start a single service in SysVinit Linux System.
+
+I have added **`httpd`**` ` service in this script but you can add the service, which you want to monitor.
+
+```
+# vi /opt/scripts/service-monitor.sh
+
+#!/bin/bash
+
+serv=httpd
+
+sstat=stopped
+
+service $serv status | grep -i 'running\|stopped' | awk '{print $3}' | while read output;
+
+do
+
+echo $output
+
+if [ "$output" == "$sstat" ]; then
+
+    service $serv start
+
+    echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
+
+    else
+
+    echo "$serv service is running"
+
+    fi
+
+done
+```
+
+Set an executable permission to **`service-monitor.sh`**` ` file.
+
+```
+$ chmod +x /opt/scripts/service-monitor.sh
+```
+
+Finally add a cronjob to automate this. It will run every 5 minutes.
+
+```
+# crontab -e
+
+*/5 * * * * /bin/bash /opt/scripts/service-monitor.sh
+```
+
+Alternatively, you can use the following script.
+
+```
+# vi /opt/scripts/service-monitor-1.sh
+
+#!/bin/bash
+
+serv=httpd
+
+sstat=$(pidof $serv | wc -l )
+
+if [ $sstat -gt 0 ]
+
+then
+
+echo "$serv is running fine!!!"
+
+else
+
+echo "$serv is down/dead"
+
+service $serv start
+
+echo "$serv service is UP now!!!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
+
+fi
+```
+
+Set an executable permission to **`service-monitor-1.sh`**` ` file.
+
+```
+$ chmod +x /opt/scripts/service-monitor-1.sh
+```
+
+Finally add a cronjob to automate this. It will run every 5 minutes.
+
+```
+# crontab -e
+
+*/5 * * * * /bin/bash /opt/scripts/service-monitor-1.sh
+```
+
+### 2) How to Automatically Start a Service When it Goes Down on systemd Linux System?
+
+Use the following bash script, if you would like to start a single service in systemd Linux System.
+
+I have added **`httpd`**` ` service in this script but you can add the service, which you want to monitor.
+
+```
+# vi /opt/scripts/service-monitor-2.sh
+
+#!/bin/bash
+
+serv=httpd
+
+sstat=dead
+
+systemctl status $serv | grep -i 'running\|dead' | awk '{print $3}' | sed 's/[()]//g' | while read output;
+
+do
+
+echo $output
+
+if [ "$output" == "$sstat" ]; then
+
+    systemctl start $serv
+
+    echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
+
+    else
+
+    echo "$serv service is running"
+
+    fi
+
+done
+```
+
+Set an executable permission to **`service-monitor-2.sh`**` ` file.
+
+```
+$ chmod +x /opt/scripts/service-monitor-2.sh
+```
+
+Finally add a cronjob to automate this. It will run every 5 minutes.
+
+```
+# crontab -e
+
+*/5 * * * * /bin/bash /opt/scripts/service-monitor-2.sh
+```
+
+Alternatively, you can use the following script.
+
+```
+# vi /opt/scripts/service-monitor-3.sh
+
+#!/bin/bash
+
+serv=httpd
+
+sstat=$(pidof $serv | wc -l )
+
+if [ $sstat -gt 0 ]
+
+then
+
+echo "$serv is running fine!!!"
+
+else
+
+echo "$serv is down/dead"
+
+systemctl start $serv
+
+echo "$serv service is UP now!!!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
+
+fi
+```
+
+Set an executable permission to **`service-monitor-3.sh`**` ` file.
+
+```
+$ chmod +x /opt/scripts/service-monitor-3.sh
+```
+
+Finally add a cronjob to automate this. It will run every 5 minutes.
+
+```
+# crontab -e
+
+*/5 * * * * /bin/bash /opt/scripts/service-monitor-3.sh
+```
+
+### 3) How to Automatically Start Multiple Services When it Goes Down on SysVinit Linux System?
+
+Use the following bash script, if you would like to start multiple service in SysVinit Linux System.
+
+I have added **`httpd`**` ` and **`rsyslog`**` ` services in this script but you can add the service, which you want to monitor.
+
+```
+# vi /opt/scripts/service-monitor-4.sh
+
+#!/bin/bash
+
+sstat=stopped
+
+for serv in httpd rsyslog
+
+do
+
+service $serv status | grep -i 'running\|stopped' | awk '{print $3}' | while read output;
+
+do
+
+echo $output
+
+if [ "$output" == "$sstat" ]; then
+
+    service $serv start
+
+    echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
+
+    else
+
+    echo "$serv service is running"
+
+    fi
+
+done
+done
+```
+
+Set an executable permission to **`service-monitor-4.sh`**` ` file.
+
+```
+$ chmod +x /opt/scripts/service-monitor-4.sh
+```
+
+Finally add a cronjob to automate this. It will run every 5 minutes.
+
+```
+# crontab -e
+
+*/5 * * * * /bin/bash /opt/scripts/service-monitor-4.sh
+```
+
+Alternatively, you can use the following script.
+
+```
+# vi /opt/scripts/service-monitor-5.sh
+
+#!/bin/bash
+
+for serv in rsyslog httpd
+
+do
+
+sstat=$(pgrep $serv | wc -l )
+
+if [ $sstat -gt 0 ]
+
+then
+
+echo "$serv is running!!!"
+
+else
+
+echo "$serv is down/dead"
+
+service $serv start
+
+echo "$serv serv is UP now!!!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
+
+fi
+
+done
+```
+
+Set an executable permission to **`service-monitor-5.sh`**` ` file.
+
+```
+$ chmod +x /opt/scripts/service-monitor-5.sh
+```
+
+Finally add a cronjob to automate this. It will run every 5 minutes.
+
+```
+# crontab -e
+
+*/5 * * * * /bin/bash /opt/scripts/service-monitor-5.sh
+```
+
+### 4) How to Automatically Start Multiple Service When it Goes Down on systemd Linux System?
+
+Use the following bash script, if you would like to start multiple services in systemd Linux System.
+
+I have added **`httpd`**` ` and **`rsyslog`**` ` services in this script but you can add the service, which you want to monitor.
+
+```
+# vi /opt/scripts/service-monitor-6.sh
+
+#!/bin/bash
+
+sstat=dead
+
+for serv in httpd rsyslog
+
+do
+
+systemctl status $serv | grep -i 'running\|dead' | awk '{print $3}' | sed 's/[()]//g' | while read output;
+
+do
+
+echo $output
+
+if [ "$output" == "$sstat" ]; then
+
+    systemctl start $serv
+
+    echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
+
+    else
+
+    echo "$serv service is running"
+
+    fi
+
+done
+
+done
+```
+
+Set an executable permission to **`service-monitor-6.sh`**` ` file.
+
+```
+$ chmod +x /opt/scripts/service-monitor-6.sh
+```
+
+Finally add a cronjob to automate this. It will run every 5 minutes.
+
+```
+# crontab -e
+
+*/5 * * * * /bin/bash /opt/scripts/service-monitor-6.sh
+```
+
+Alternatively, you can use the following script.
+
+```
+# vi /opt/scripts/service-monitor-7.sh
+
+#!/bin/bash
+
+for serv in rsyslog httpd
+
+do
+
+sstat=$(pgrep $serv | wc -l )
+
+if [ $sstat -gt 0 ]
+
+then
+
+echo "$serv is running!!!"
+
+else
+
+echo "$serv is down/dead"
+
+systemctl start $serv
+
+echo "$serv serv is UP now!!!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
+
+fi
+
+done
+```
+
+Set an executable permission to **`service-monitor-7.sh`**` ` file.
+
+```
+$ chmod +x /opt/scripts/service-monitor-7.sh
+```
+
+Finally add a cronjob to automate this. It will run every 5 minutes.
+
+```
+# crontab -e
+
+*/5 * * * * /bin/bash /opt/scripts/service-monitor-7.sh
+```
+
+### 5) How to Automatically Start a Service When it Goes Down on systemd and SysVinit Linux System?
+
+Use the following bash script, if you would like to start a service in systemd and SysVinit Linux System.
+
+I have added **`httpd`**` ` service in this script but you can add the service, which you want to monitor.
+
+```
+# vi /opt/scripts/service-monitor-8.sh
+
+#!/bin/bash
+
+smanager=$(ps -p1 | grep "init\|systemd" | awk '{print $4}')
+
+serv=httpd
+
+if (( $(pidof $serv | wc -l) > 0 ))
+
+then
+
+echo "$serv is running!!!"
+
+elif [ "$smanager" == "init" ]
+
+then
+
+service $serv start
+
+echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
+
+else
+
+systemctl start $serv
+
+echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
+
+fi
+```
+
+Set an executable permission to **`service-monitor-8.sh`**` ` file.
+
+```
+$ chmod +x /opt/scripts/service-monitor-8.sh
+```
+
+Finally add a cronjob to automate this. It will run every 5 minutes.
+
+```
+# crontab -e
+
+*/5 * * * * /bin/bash /opt/scripts/service-monitor-8.sh
+```
+
+### 6) How to Automatically Start Multiple Services When it Goes Down on systemd and SysVinit Linux System?
+
+Use the following bash script, if you would like to start multiple services in systemd and SysVinit Linux System.
+
+I have added **`httpd`**` ` and **`rsyslog`**` ` services in this script but you can add the service, which you want to monitor.
+
+```
+# vi /opt/scripts/service-monitor-9.sh
+
+#!/bin/bash
+
+smanager=$(ps -p1 | grep "init\|systemd" | awk '{print $4}')
+
+for serv in rsyslog httpd
+
+do
+
+if (( $(pgrep $serv | wc -l) > 0 ))
+
+then
+
+echo "$serv is running!!!"
+
+elif [ "$smanager" == "init" ]
+
+then
+
+service $serv start
+
+echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
+
+else
+
+systemctl start $serv
+
+echo "$serv service is UP now.!" | mail -s "$serv service is DOWN and restarted now On $(hostname)" [email protected]
+
+fi
+
+done
+```
+
+Set an executable permission to **`service-monitor-9.sh`**` ` file.
+
+```
+$ chmod +x /opt/scripts/service-monitor-9.sh
+```
+
+Finally add a cronjob to automate this. It will run every 5 minutes.
+
+```
+# crontab -e
+
+*/5 * * * * /bin/bash /opt/scripts/service-monitor-9.sh
+```
+
+--------------------------------------------------------------------------------
+
+via: https://www.2daygeek.com/linux-bash-script-auto-restart-services-when-down/
+
+作者：[Magesh Maruthamuthu][a]
+选题：[lujun9972][b]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: https://www.2daygeek.com/author/magesh/
+[b]: https://github.com/lujun9972
+[1]: https://www.2daygeek.com/category/shell-script/