Teach you to use shell script to check whether the server program is running

shell Script timing detection python Whether the program is running

shell Script

#!/bin/bash

echo " Start checking the freight fright_run Whether the program is running ..."

cd /opt/gh2/app/goods-freight-py

processID=$(ps -ef | grep freight_run.py | grep -v "grep" | awk "{print $2}")
echo $processID
#  Judge $processID It's empty , This means if $processID It's empty , So restart 
if [ -z "$processID" ]
then
    #  Start freight fright_run Program 
    echo " The freight fright_run The program is not running ,  Restarting ..."
    #nohup python3 freight_run.py >/dev/null &
    nohup python3 freight_run.py >/store/logs/goods-freight-py/startpy.log &
    echo "fright_run Program restart succeeded ..."
    #  Send E-mail ,  It's better to write absolute path , E-mail restart may fail 
    #cd /opt/gh2/app/goods-freight-py/common
    #python3 send_email.py "fright_run Program restart succeeded ..."
    python3 /opt/gh2/app/goods-freight-py/common/send_email.py "fright_run Program restart succeeded ..." "${ipAdress}"


else
    echo "fright_run The program is running ..."
fi

# ps -ef  Show progress 
# | grep your_keywords  Filter by keyword 
# | grep -v “grep”  shielding grep The process of the program itself 
# | awk ‘{print $2}’  Print only the second column 
# process_id=${ sentence }  Assign the return value of the statement execution to process_id, Note that you can't be free before and after the equal sign 
# [ -z "$process_id”]  Judge $process_id It's empty 
# [[ -z "$process_id”]]  Judge $process_id Not empty  ,  Notice that there are two brackets before and after ,Shell The grammar of is a little strange 
# kill -9 $process_id  Kill variables $process_id Specified process 

linux On crontab start-up sh：
The first shell Put the script in /opt/gh2/app/goods-freight-py
The way 1：vi /etc/crontab Enter editing mode after , Add below
*/1 * * * * sh /opt/gh2/app/goods-freight-py/shell/check_freight_run.sh >/store/logs/goods-freight-py/freightRun.log 2>&1
The way 2： After connecting to the server , direct
crontab -e Enter editing mode after , Add below
*/1 * * * * sh /opt/gh2/app/goods-freight-py/shell/check_freight_run.sh >/store/logs/goods-freight-py/freightRun.log 2>&1

View all scheduled tasks ： crontab -l
see crontab The default log ：tail -f /var/log/cron

matters needing attention ：

If it is window Written in the second part shell Script , Copied to the linux Up operation , Will report a mistake
terms of settlement : vim freight.sh after , On the command line First :set fileformat=unix , And then again :wq
A test run freight.sh: bash freight.sh