Actual combat simulation monitor MySQL Service shell script summary _linux Shell

1 Port Judgment ==> only for database local use

Method for judging the 1:if condition of law

[Root@oldboy scripts]# cat check_db01.sh
#!/bin/sh
#created by Oldboy
#mail: oldboy521@gmail.com
portnum= ' Netstat-lnt|grep 3306|wc-l '
if [$PortNum-eq 1]
then
 echo "Mysqld is running."
else
 echo "Mysqld is stoped."
Fi

Method 2: Conditional expression usage

[Root@oldboy scripts]# cat check_db01_1.sh
#!/bin/sh
#created by Oldboy
#mail: oldboy521@gmail.com
 
portnum= ' netstat-lnt|grep 3306|wc-l '
#PortNum = ' nmap 10.0.0.189-p 3306|grep ' open|wc-l '
[$PortNum-eq 1] && echo "Mysqld is running." | | echo "Mysqld is stoped."

Method 3: Using the System function display method

[Root@oldboy scripts]# cat check_db01_2.sh
#!/bin/sh
#created by Oldboy
#mail: oldboy521@gmail.com
# Load functions
[-f/etc/init.d/functions] &&/etc/init.d/functions
portnum= ' Netstat-lnt|grep 3306| Wc-l '
if [$PortNum-eq 1]
then
 action mysqld is running. '/bin/true
else
 action ' mysqld is Stope D. "/bin/false
fi

2 process plus port judgment ==> only for database local use

[Root@oldboy scripts]# cat check_db02.sh
#!/bin/sh
#created by Oldboy
#mail: oldboy521@gmail.com
 
portnum= ' Netstat-lnt|grep 3306|wc-l '
Processnum= ' Ps-ef|grep mysql|grep-v grep| Wc-l '
#echo $PortNum $ProcessNum
#exit 1
 
if [$PortNum-eq 1-a $ProcessNum-eq 2]
then
 echo "M Ysqld is running. "
else
 echo "Mysqld is stoped."
Fi

Tip: If you are not assured, you can also add analog user access.

Tip: Scripting Debugging Tips

1 grep filtered string, do not include in the filename, example: grep mysql, file name for check_mysql.sh is not very good. Better file names such as:
-rw-r--r--1 root 236 Sep 9 22:19 check_db01.sh
-rw-r--r--1 root 293 Sep 9 22:34 check_db02.sh
-rw-r--r--1 root 212 Sep 9 22:49 check_db03.sh
2 when the syntax is no problem but the results are not correct, you can use the following methods to troubleshoot:
(a) Print the variable results after the definition of the variable to see if it is consistent with the actual result, such as:
Echo $PortNum $ProcessNum
Exit 1
b sh-x check_db02.sh Way, tracking script execution process, more debugging scenarios see later shell script debugging.
3 the way to determine whether the remote MySQL service is normal

Method 1: Port check ==> is suitable for use on remote server (local also suitable)

[Root@oldboy scripts]# cat check_db03.sh
#!/bin/sh
#created by Oldboy
#mail: oldboy521@gmail.com
Portnum= ' nmap 10.0.0.189-p 80|grep open|wc-l '
if [$PortNum-eq 1]
then
 echo "Mysqld is running."
else
 echo "Mysqld is stoped."
Fi

Tip: There are a number of ways to use the port, including 3 methods that are not limited to the following address, http://oldboy.blog.51cto.com/2561410/942530
For example: You can also use the Nagios check_tcp Plug-ins and other methods.
Act 2: Simulate user (including Web server) access method ==> is suitable for remote server use (local also appropriate)

[Root@oldboy scripts]# cat check_db04.sh
#!/bin/sh
#created by Oldboy
#mail: oldboy521@gmail.com
 
Mysql-s/data/3306/mysql.sock-e "select version ();" >/dev/null 2>&1
if [$-eq 0]
then
 echo "Mys Qld is running. "
else
 echo "Mysqld is stoped."
Fi

Skills:
1 Use a Web Connection account to simulate access.
Law 3: Simulate the way users use the program URL to judge

<?php
/* #this scripts is created by Oldboy
#oldboy qq:31333741
#site: http:// www.etiantian.org
#blog: http://oldboy.blog.51cto.com
#oldboy trainning QQ group:208160987 226199307 44246017
* *
  $link _id=mysql_connect (' 10.0.0.4 ', ' Oldboy ', ' oldboy123 ') or mysql_error ();
  if ($link _id) {
   echo "MySQL successful by Oldboy!";
  } else{
   Echo mysql_error ();
>

The above method is just a simple judgment, then the following gives a set of judgment, processing, and alarm in a more professional MySQL check processing script.
4) More professional MySQL check processing script solution

#!/bin/bash #created by Oldboy QQ 49000448 #date: 20100918 myuser=root mypass= "Oldboy" Mysock=/data/3306/mysql.sock mysql_startup= "/data/3306/mysql" log_path=/tmp log_file=${log_path}/mysqllogs_ ' Date +%f '. LOG MYSQL_PATH=/usr/local 
/mysql/bin mysql_cmd= "$MYSQL _path/mysql-u$myuser-p$mypass-s $MYSOCK" #→ whole variable definition way, appear more professional. 
$MYSQL _cmd-e "select version ();" >/dev/null 2>&1 if [$-eq 0] then echo "MYSQL is running!" 
Exit 0 Else $MySQL _startup Start > $LOG _file#→ log is also a variable. 
Sleep 5; $MYSQL _cmd-e "select version ();" >/dev/null 2>&1 if [$-ne 0] then for num in ' seq 10 ' #→ kill mysqld through A for loop, 
The real kill then exits the cycle or kills every two seconds, killing 10 times altogether. 
Do killall mysqld>/dev/null 2>&1 [$-ne 0] && break; Sleep 2 $MySQL _startup start >> $LOG _file fi $MYSQL _cmd-e "select version ();" >/dev/null 2>&1 &am p;& status= "restarted" | | 
Status= "Unknown" #→ this logic is more accurate. echo "MySQL status is $Status" >> $LOG _file mail-s "MySQL status is $Status"31333741@qq.com < $LOG _file #→ the above status as the result of the title to the message, of course you can do SMS, voice call alarm."  Fi exit