"Shell scripting system monitoring-------Email alerts"

Like many of my classmates, I was confused shell programming before I learned shell programming, but I didn't know what it could do, but I felt I could use a different way to manage the system. Now I slowly understand the importance of the shell for a small room inside a small shell monitor enough, of course, large-scale computer room can not use the shell to monitor the system, because large computer room monitoring machine has a lot of, and their status is to report and graphical interface form to report problems.

Next I write an article about how to use the shell to monitor the system and send messages.

Create a file:

Vim monitor.sh

#/bin/bash             ----Default Execution method # The following is the variable: HOST= ' hostname '         ---Output the machine name of the current system sys= ' uname -a '           ---Output current system Information date= ' date  "+%f %h:%m:%s" '         ---Output current system time web=/var/www/html/$HOST .html        --- Create a Web page for the current system's Web site (named after the script) cpu= ' cat /proc/cpuinfo |grep processor | wc -l '      ---Output the current system's CPU information (as a judgment information) id= ' vmstat | awk  ' nr==3{print $15 } '          ----Output The current system CPU IP number wa= ' vmstat | awk  ' nr==3{print $16  } '         ---The waiting percentage of the I/O for the output system load= ' w | awk  ' nr==1{ print $8} '  |awk -F  ', '   ' {print $1} '        -- -Output system Load value disk= ' df -h |awk  ' nr==3{print $4} '  |awk -F  '% '   ' {print $1} '      ---output hard drive value free= ' free -m | awk  ' nr==2{print $4} '          ----Output Memory idle value cache= ' free -m | awk  ' nr==2{print $7} '         ----Output Memory cache value tcp= ' NETSTAT&NBSP;-ATUNLP '              ----Output The current system's network link status if= ' iftop -i eth0 -p -nn -l  100 -s 1 -t >> $WEB '         --- The state of the Eth0 interface of the output system # The following is the output of the variables executed above # Here the number of threads on the CPU, the load of the CPU, the state of the system disk, the memory remaining. These four to do a mail alarm echo  "Design for leoheng" echo  "######---hostname---##########" echo hostname= " echo  $HOST ' echo  ' ######---system parameters---######## "echo system= ' echo  $SYS '          echo  "######---Number of CPU threads---#######" echo processor=' echo  $CPU ' if [  $CPU  -eq 4 ];then ' echo  ' wa= $WA  and id= $ID   Cpu processor is ok " | mail -s " $HOST  cpu " [email protected] ' Else ' echo  "wa= $WA  and id= $ID  cpu processor have problem"  | mail  -s  "$HOST  cpu"  [email protected] ' fiecho  "######---CPU ID---#########" echo  Cpu~id= ' echo  $ID ' echo  ' ######---CPU wa---######### ' echo cpu~wa= ' echo  $WA ' echo  ' ###### ---CPU load---####### "echo cpu-load= ' echo  $LOAD ' if [  $LOAD  > 0.05 ];then ' echo  ' cpu-load is beyond the rate  | mail -s  ' cpu-load '  [ Email protected] ' Else ' echo  "Cpu-load is ok"  | mail -s  "Cpu-load"   [email protected] ' fiecho  ' ######---system disk status---# # "echo disk-status= ' echo  $DISK ' if [   $DISK &NBSP;&GT; 80 ];then ' echo  "system-disk is beyond the 80%"  | mail -s   "System-disk"  [email protected] ' Else ' echo  "System-disk is ok"  | mail  -s  "System-disk"  [email protected] ' fiecho  "######---memory remaining---########" echo memory = ' echo  ($FREE + $CACHE)  kb '      memory=$ (($FREE + $CACHE)) echo  $memoryif  [  $memory  < 1000 ];then ' echo  "system-memory less than 1000m   " | mail -s " System-memory " [email protected"          else                  ' echo  "System-memory is ok"  | mail -s  "System-memory"  [email protected] '         fi                         echo  "######--- TCP-related connection status----# "echo tcp-status= ' echo  $TCP ' echo " ######---eth0 traffic---###### "echo  $IFecho   "END"

# # # # # # # # # # # # # # # # # #---##### #部分同学的邮件无法发出 after exiting the shell, probably for two reasons 1. MAILX package is not installed Yum install-y mailx sendmail2. System Setup does not do the following to Inet_ The interfaces option changes to all, as follows vim/etc/postfix/main.cfinet_interfaces = All

This article is from the "Leoheng" blog, make sure to keep this source http://leoheng.blog.51cto.com/12202141/1955773

"Shell scripting system monitoring-------Email alerts"