监控数据库的shell脚本经典案例
安装mysql，和开启mysql服务
yum install mariadb-server -y
systemctl start mariadb
firewall-cmd --add-service=mysql
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1. 检测端口命令
方法一
[root@localhost sbin]# netstat -antlpe|grep 3306|awk -F "[ :]+" '{print $5}'
3306
[root@localhost sbin]# ss -antlpe | grep mysql |wc -l
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方法二：lsof
[root@localhost sbin]# yum whatprovides */lsof
Loaded plugins: langpacks
rhel-7.3/filelists_db | 3.3 MB 00:00
lsof-4.87-4.el7.x86_64 : A utility which lists open files on a
: Linux/UNIX system
Repo : rhel-7.3
Matched from:
Filename : /usr/sbin/lsof
lsof-4.87-4.el7.x86_64 : A utility which lists open files on a
: Linux/UNIX system
Repo : @rhel_dvd
Matched from:
Filename : /usr/sbin/lsof
[root@localhost sbin]# yum install lsof-4.87-4.el7.x86_64 -y
Loaded plugins: langpacks
Package lsof-4.87-4.el7.x86_64 already installed and latest version
Nothing to do
[root@localhost sbin]# lsof -i tcp:3306
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
mysqld 11023 mysql 14u IPv4 86649 0t0 TCP *:mysql (LISTEN)
[root@localhost sbin]# lsof -i tcp:3306|wc -l # 包含第一行的标题栏
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方法三：ss与netstat类似
[root@localhost init.d]# ss -antlpe|grep mysql
LISTEN 0 50 *:3306 *:* users:(("mysqld",6348,14)) uid:27 ino:33847 sk:ffff88007bdecf00 <->
[root@localhost init.d]# ss -antlpe|grep mysql|wc -l
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2. 远程服务器检测本地端口
yum install nmap-6.40-7.el7.x86_64 -y
yum install telnet nc -y
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方法一：使用nmap命令
# 查看远程端口是否开启，开启的话state状态是open
[root@server2 ~]# nmap 172.25.60.251 -p 3306
Starting Nmap 6.40 ( http://nmap.org ) at 2020-02-16 23:01 EST
Nmap scan report for 172.25.60.251
Host is up (0.00031s latency).
PORT STATE SERVICE
3306/tcp open mysql
MAC Address: 52:54:00:00:05:0A (QEMU Virtual NIC)
Nmap done: 1 IP address (1 host up) scanned in 13.43 seconds
[root@server2 ~]# nmap 172.25.60.251 -p 3306|grep open
3306/tcp open mysql
[root@server2 ~]# nmap 172.25.60.251 -p 3306|grep open|wc -l
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方法二：telnet命令
telnet是常用来监测远程服务器端口是否通畅的一个命令，在非交互式需要采用特殊写法。过滤的关键字为Connected，返回1，说明3306端口是通的。
[root@server2 ~]# telnet 172.25.60.251 3306
Trying 172.25.60.251...
Connected to 172.25.60.251.
Escape character is '^]'.
H Host '172.25.60.252' is not allowed to connect to this MariaDB serverConnection closed by foreign host.
[root@server2 ~]# telnet 172.25.60.251 3306|grep Connected
Connected to 172.25.60.251.
Connection closed by foreign host.
[root@server2 ~]# telnet 172.25.60.251 3306|grep Connected|wc -l
Connection closed by foreign host.
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3. 对服务进程或进程数进行监控（适合本地服务器）
[root@localhost sbin]# ps -ef|grep mysql|wc -l # 此处把过滤的动作也当作了一个进程
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[root@localhost sbin]# ps -ef|grep mysql
mysql 10864 1 0 03:15 ? 00:00:00 /bin/sh /usr/bin/mysqld_safe --basedir=/usr
mysql 11023 10864 0 03:15 ? 00:00:00 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --log-error=/var/log/mariadb/mariadb.log --pid-file=/var/run/mariadb/mariadb.pid --socket=/var/lib/mysql/mysql.sock
root 17200 3406 0 03:59 pts/1 00:00:00 grep --color=auto mysql
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过滤掉grep那句，只剩下mysql的进程
[root@localhost sbin]# ps -ef|grep mysql|grep -v grep
mysql 10864 1 0 03:15 ? 00:00:00 /bin/sh /usr/bin/mysqld_safe --basedir=/usr
mysql 11023 10864 0 03:15 ? 00:00:00 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --log-error=/var/log/mariadb/mariadb.log --pid-file=/var/run/mariadb/mariadb.pid --socket=/var/lib/mysql/mysql.sock
[root@localhost sbin]# ps -ef|grep mysql|grep -v grep|wc -l
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4. 开发监控mysql数据库的脚本
脚本一
[root@localhost 监控mysql数据库]# cat check_01.sh
#!/bin/bash
if [ "`netstat -antlpe | grep 3306 | awk -F '[ :]+' '{print $5}'`" = "3306" ]
then
echo "mysql is running"
else
echo "mysql is stop,now start it"
systemctl start mariadb
fi
[root@localhost 监控mysql数据库]# sh check_01.sh
mysql is running
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脚本二
[root@localhost 监控mysql数据库]# cat check_02.sh
#!/bin/bash
if [ `netstat -antlpe | grep 3306 | wc -l` -eq 1 ]
then
echo "mysql is running"
else
echo "mysql is stop,now start it"
systemctl start mariadb
fi
[root@localhost 监控mysql数据库]# sh check_02.sh
mysql is running
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脚本三
[root@localhost 监控mysql数据库]# cat check_03.sh
#!/bin/bash
if [ `lsof -i tcp:3306 | wc -l` -eq 2 ]
then
echo "mysql is running"
else
echo "mysql is stop,now start it"
systemctl start mariadb
fi
[root@localhost 监控mysql数据库]# sh check_03.sh
mysql is running
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脚本四
[root@localhost 监控mysql数据库]# cat check_04.sh
#!/bin/bash
if [ `ss -antlpe |grep mysql| wc -l` -eq 1 ]
then
echo "mysql is running"
else
echo "mysql is stop,now start it"
systemctl start mariadb
fi
[root@localhost 监控mysql数据库]# sh check_04.sh
mysql is running
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