Linux Monitoring system resources-memory

Monitor memory usage:

Idea: Use Free-m to extract the relevant data, calculate the amount of memory input to the file, and each calculation is compared with the data in the current file, larger than the data in the file is replaced. Keep the maximum memory usage for the day and send mail each day (you can write a separate script for sending messages). the script can be written to the scheduled task for how long it takes to execute. You can also add a wheel loop background start in the script

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Total of MEM lines: Overall system memory

-/+ Buffers/cache Line used: actual use of memory

-/+ Buffers/cache Line of free: program actually callable memory

#!/bin/bashpath=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.7.0_45/bin:/usr/ java/jdk1.7.0_45/jre/bin:/usr/local/ccdtsoft/mvn_maven/bin:/root/bindays= ' date + '%Y%m%d "' freeDATE= ' date  + "%y-%m-%d--%h:%m:%s" ' data_path=/usr/local/ccdtsoft/data/bulldog/count/${days}file= ' hostname ' _ maxfree.txt# Total Memory total= ' free -m|grep mem|awk  ' {print $2} ' #free  -m  second row of user, Actual memory used= ' free -m|grep buffers/cache|awk  ' {print $3} ' #free  -m  second row of free, The program can invoke the actual memory free= ' free -m|grep buffers/cache|awk  ' {print $4} ' #百分比USED/total (percentage of actual memory used) Usage_ b= ' awk  ' begin{printf  "%.2f%\n", (' $USED '/' $TOTAL ') *100} ' If [ ! -d ${data_path}  ];    then        mkdir -p ${data_ path}fi# for the first time every day   statistics to create a statistical file and enter the first value, the next time the value of the file in the comparison, if it is greater than the percentage of used memory output replace the file content, retain the largest memory usage data if [ ! - F ${data_path}/${file} ];        then             touch ${DATA_PATH}/${FILE}                         echo -e  "${file}\ n Maximum Memory Usage: ${date}\n total memory (m):  ${total}\n Memory actual usage (m):  ${used}\n memory percent Used (m):  ${usage_b}\n---\ n "  > ${DATA_PATH}/${FILE}                  #echo   "Actual memory usage (m):  ${used}"  >> ${DATA_PATH}/${FILE}                  #echo  % used memory ( m):  ${usage_b} " >> ${DATA_PATH}/${FILE}         Else            if [ ${used} -gt   ' cat ${data_path}/${file}|grep  Memory Actual usage |awk  ' {print $2} '  ];                 then                     echo -e  "${file}\n Day Maximum memory usage: ${ date}\n Total Memory (m):  ${total}\n Memory actual usage (m):  ${used}\n memory percent Used (m):  ${usage_b}\n---\ n " > ${ Data_path}/${file}            fifi#mail -s   "${days}-host Nginxload-tomcat Memory usage"   @qq. Com < ${data_path}/${file} #echo  usage_b=$ Usage_b

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What advice and need to correct the place can leave a message, thank you

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Linux Monitoring system resources-memory