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This article introduces how to use Shell script to achieve mail monitoring Linux system memory, the content is very detailed, interested friends can refer to, hope to be helpful to you.

First, install a mail client Msmtp software under Linux (similar to a Foxmail tool)

* * 1. Download and install: * * http://downloads.sourceforge.net … 206451&big_mirror=0

# tar jxvf msmtp-1.4.16.tar.bz2# cd msmtp-1.4.16#. / configure-- prefix=/usr/local/msmtp# make# make install

2. Create msmtp configuration file and log file (host is the email domain name, email user name test, password 123456)

# vim ~ / .msmtprcaccount default host 126.com from test@126.com auth login user test password 123456 logfile ~ / .msmtp.log # chmod 123456 ~ / .msmtprc # touch ~ / .msmtp.log

3. Mutt installation configuration: * (generally, mutt is installed by default under linux)

# vim ~ / .muttrcset sendmail= "/ usr/local/msmtp/bin/msmtp" set use_from=yes set realname= "memory" set from=test@126.com set envelope_from=yes set rfc2047_parameters=yes set charset= "utf-8"

4. Email delivery test (- s email title,-a table with attachment)

# echo "message content 123456" | mutt-s "message title Test message"-a / scripts/test.txt test@126.com

Second, use Free command to monitor system memory

1. Use the free command to view the memory usage of the linux system: * * (in M)

# free-m (the execution results are as follows) total used free shared buffers cachedMem: 3952 3414 538 0 168 484 buffers/cache: 2760 1191Swap: 8191 86 8105

2. Check the numerical command to intercept the remaining memory free:

(1) Free value of physical memory: # free-m | grep Mem | awk'{print $4}'(2) Free value of buffer: # free-m | grep-| awk'{print $4}'(3) Free value of Swap partition: # free-m | grep Swap | awk'{print $4}'

3. Write a script file for memory monitoring:

# vim / scriptsAfter freemem.shemeandbinappBash # use the free command to monitor the memory changes of the linux system # fetch the current time of the system (write to the file by append > >) date > > / scripts/date-time.txt# grab the free value of physical memory (write to the file by append > >) echo Mem-free: `free-m | grep Mem | awk'{print $4}'`M > > / scripts/mem-free.txt# grab buffer Free value (write file by append >) echo buffers/cache-free: `free-m | grep-| awk'{print $4}'`M > > / scripts/buffers-free.txt# crawls the free value of Swap partition (write file by append > >) echo Swap-free: `free-m | grep Swap | awk'{print $4}'`M > > / scripts/swap-free.txt# connects the above time and memory-related line data line by line (each rewrite Import file >) paste / scripts/date-time.txt / scripts/mem-free.txt / scripts/buffers-free.txt / scripts/swap-free.txt > / scripts/freemem.txt# chmod aquix / scripts/free-mem.sh# / scripts/free-mem.sh

4. View the result file of memory monitoring:

# cat / scripts/freemem.txt

5. Write the free result file email sending script:

# vim / scriptsAccording to the generated freemem.txt file to the user # extract the IP address information of this server IP= `ifconfig eth0 | grep "inet addr" | cut-f 2-d ":" | cut-f 1-d "`# extract the current date time today= `date-d" 0 date +% Y% m / d%` # send the memory monitoring result echo "this is the memory monitoring report of $IP server $today Please download the attachment. " | | mutt-s "$IP Server $today memory Monitoring report"-a / scripts/freemem.txt test@126.com# chmod adepx / scripts/sendmail-mem.sh |

3. Monitor the exchange partition Swap of the system, and send alarm email when using more than 80%

# vim / scriptsAccording to IP address information extracted from this server: IP= `ifconfig eth0 | grep "inet addr" | cut-f 2-d ":" | cut-f 1-d "`# Total swap_total= `free-m assigned by the system | grep Swap | awk'{swap $2}'` # current remaining free size swap_free= `free-m | grep Swap | awk'{print $4}'`# Used size used swap_used= `free-m | grep Swap | awk'{print $3} '`if ((swap_used! = 0)) Then # if the swap partition has been used, calculate the percentage of the total free of the current remaining swap partition, expressed as a decimal, and add an integer digit 0 swap_per= 0`echo "scale=2;$swap_free/$swap_total" before the decimal point | bc` # set the alarm value of the swap partition to 20% (that is, alarm when more than 80% is used). Compare the current percentage of swap_warn=0.20# remaining swap with the alarm value (1 is returned when the alarm value is greater than 20%, and 0 is returned if less than 20% is left)) swap_now= `expr $swap_per > $swap_ warn` # if the current swap uses more than 80% (that is, the remaining 20% is less than 20%, the above return value is equal to 0), email alarm if (($swap_now= = 0) immediately) Then echo "$IP server swap exchange partition only $swap_free M is unused, the remaining less than 20%, and the utilization rate has exceeded 80%. Please deal with it in a timely manner." | | mutt-s "$IP server memory alarm" test@126.comfi fi # chmod astatx / scripts/swap-warning.sh |

* * 4. Join the task plan: * * memory is checked every 10 minutes, if there is an alarm, email is sent immediately (once every 10 minutes), and the email of memory test result is sent at 8 o'clock every morning.

# crontab-eSplash 10 * / scripts/free-mem.sh * / 10 * / scripts/swap-warning.sh 0 8 * / scripts/sendmail-mem.sh# service crond restart what is the Linux system Linux is a free-to-use and free-spread UNIX-like operating system, is a POSIX-based multi-user, multi-task, multi-thread and multi-CPU operating system Using Linux, you can run major Unix tools, applications, and network protocols.

On how to use Shell script to achieve mail monitoring Linux system memory sharing here, I hope the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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