Linux process automatically monitors bash shell scripts

The purpose of this script:

Mainly used to monitor the Linux VPS server load and memory footprint, such as MySQl, PHP-FPM, when the load or memory consumption reached the set value, it will automatically restart the process to avoid downtime.

The code is as follows:

# Set maximum memory occupancy percentage

pid_mem_max= "85"

# Set Maximum system load

sys_load_max= "3"

# Set the name of the service that needs to be monitored

name_list= "PHP-FPM MySQL"

For NAME in $NAME _list

Todo

# Initialize Memory statistics

Pid_mem_sum=0

# get the total process number of the program

pid_num_sum= ' ps aux | grep $NAME | Wc-l '

# list percent per process memory footprint

pid_mem_list= ' ps aux | grep $NAME | awk ' {print $} '

# Calculate total memory footprint for all processes

For Pid_mem in $PID _mem_list

Todo

Pid_mem_sum= ' echo $PID _mem_sum + $PID _mem | BC '

Done

# get the last minute system load

Sys_load= ' Uptime | awk ' {print $ (NF-2)} ' | Sed ' s/,//'

# Compare memory footprint and system load over thresholds

Mem_vule= ' awk ' begin{print (' $PID _mem_sum "' >= '" $PID _mem_max ""? " 1 ": 0")} '

Load_vule= ' awk ' begin{print (' $SYS _load "' >= '" $SYS _load_max ""? " 1 ": 0")} '

# If the system memory footprint and system load exceed the threshold, do the following.

if [$MEM _vule = 1] | | [$LOAD _vule = 1]; then

# Write Log

echo $ (date + "%y-%m-%d%h:%m:%s") "Killall $NAME" (MEM: $PID _mem_sum,load: $SYS _load) ">>/var/log/autoreboot.log

# Normal Stop Service

/etc/init.d/$NAME Stop

Sleep 3

# Force Close

Pkill $NAME

# reboot

/etc/init.d/$NAME Start

#写入日志

echo $ (date + "%y-%m-%d%h:%m:%s") "Start $NAME" (MEM: $PID _mem_sum,load: $SYS _load) ">>/var/log/autoreboot.log

Else

echo "$NAME very health! (MEM: $PID _mem_sum,load: $SYS _load) ">/dev/null

Fi

Done

End of code

The above code is saved as a file, for example: auto_reboot.sh

To add a scheduled task, set the check once per minute

Crontab-e

* * * * */bin/bash/root/auto_reboot.sh * * *

Note that the location of the file should be correct.