Simple implementation method of Linux process monitoring and automatic restart

Purpose:

Under Linux, the server program may be dumped for various reasons, which will affect user use. Here we provide a simple process monitoring and restart function.

Implementation principle:

The script is called by the scheduled task crontab. The script uses ps to check whether the process exists. If it does not exist, it restarts and writes a log.

Crontab modification

# crontab -e
*/5 * * * * /mnt/bindmonitor.sh

Implementation of /mnt/bindmonitor.sh

#!/bin/sh

host_dir=`echo ~` # Current user root directory proc_name="/home/wkubuntu/named/sbin/named" # Process name file_name="/mnt/bindmonitor.log" # Log file pid=0

proc_num() # Calculate the number of processes {
 num=`ps -ef | grep $proc_name | grep -v grep | wc -l`
 return $num
}

proc_id() # process number {
 pid=`ps -ef | grep $proc_name | grep -v grep | awk '{print $2}'`
}

proc_num
number=$?
if [ $number -eq 0 ] # Check if the process exists then 
 /home/wkubuntu/named/sbin/named -c /home/wkubuntu/named/etc/named.conf -n 1 &
              # Command to restart the process, please modify proc_id accordingly # Get the new process ID echo ${pid}, `date` >> $file_name # Record the new process ID and restart time to file

Deleting process tests

a. #killall -15 named

b. After 5 minutes, run cat /mnt/bindmonitor.log to see if there are any new records. The process number should correspond to the process number in # ps -ef |grep named.

Summarize

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