zabbix应用之low-level discovery监控mysql

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　　当一台服务器上MySQL有多个实例的时候，MySQL占用多个不同端口。利用zabbix的low-level discovery可以轻松监控。
　　思路参考：http://dl528888.blog.51cto.com/2382721/1357713

　　下面我写了一个简单的脚本，用于一键部署mysql监控。

　　    一、客户端
　　在被监控端运行此脚本,前提条件已经安装好了zabbix agent(推荐yum安装)。脚本已在CentOS6.2 x86_64环境下测试通过。脚本在附件提供下载。

#!/bin/sh
#
# Filename:  autoMonitorMysql.sh
# Revision:  1.0
# Date:    2014/08/12
# Author:    Qicheng
# Email:
# Website:   http://qicheng0211.blog.51cto.com/
# Description: zabbix low level discovery监控MySQL
# Notes: 在被监控客户端运行此脚本,前提条件已经安装好zabbix agent
#
ROOT_UID=0
if [ "$UID" -ne "$ROOT_UID" ];then
  echo "Error: 必须以root用户运行此程序！"
  exit 1
fi
# 自行修改为你的zabbix agent配置文件路径
AGENT_CONF="/etc/zabbix/zabbix_agentd.conf"
mkdir -p /etc/zabbix/monitor_scripts
# 创建 mysql low-level discovery 脚本
cat > /etc/zabbix/monitor_scripts/mysql_port_discovery.sh << 'EOF'
#!/bin/bash
#Function: mysql low-level discovery
#Script_name: mysql_port_discovery.sh
mysql() {
  port=(`sudo /bin/netstat -tpln | awk -F "[ :]+" '/mysql/ && /0.0.0.0/ {print $5}'`)
  max_index=$[${#port[@]}-1]
  printf '{\n'
  printf '\t"data":['
  for key in ${!port[@]}
  do
    printf '\n\t\t{'
    printf ""{#MYSQLPORT}":"${port[${key}]}"}"
  if [ $key -ne $max_index ];then
      printf ","
    fi
  done
  printf '\n\t]\n'
  printf '}\n'
}
case "$1" in
  mysql)
    "$1"
    ;;
  *)
    echo "Bad Parameter."
    echo "Usage: $0 mysql"
    exit 1
    ;;
esac
EOF
chown -R zabbix:zabbix /etc/zabbix/monitor_scripts
chmod +x /etc/zabbix/monitor_scripts/mysql_port_discovery.sh
# 判断配置文件是否存在
[ -f "${AGENT_CONF}" ] || { echo "ERROR: File ${AGENT_CONF} does not exist.";exit 1;}
include=`grep '^Include' ${AGENT_CONF} | cut -d'=' -f2`
# 在配置文件中添加自定义参数
if [ -d "$include" ];then
  cat > $include/mysql_lld.conf << 'EOF'
UserParameter=mysql_port_discovery
[*],/bin/bash /etc/zabbix/monitor_scripts/mysql_port_discovery.sh $1
UserParameter=mysql_status
[*],mysql -h 127.0.0.1 -P $1 -uzabbix -pzabbix -N -e "show global status  where Variable_name='$2'" 2>/dev/null | cut -f2
UserParameter=mysql_ping
[*],mysqladmin -h 127.0.0.1 -P $1 -uzabbix -pzabbix ping 2>/dev/null | grep -c alive
EOF
else
  grep -q '^UserParameter=mysql_port_discovery' ${AGENT_CONF} || cat >> ${AGENT_CONF} << 'EOF'
UserParameter=mysql_port_discovery
[*],/bin/bash /etc/zabbix/monitor_scripts/mysql_port_discovery.sh $1
UserParameter=mysql_status
[*],mysql -h 127.0.0.1 -P $1 -uzabbix -pzabbix -N -e "show global status  where Variable_name='$2'" 2>/dev/null | cut -f2
UserParameter=mysql_ping
[*],mysqladmin -h 127.0.0.1 -P $1 -uzabbix -pzabbix ping 2>/dev/null | grep -c alive
EOF
fi
# 手动MySQL授权，添加zabbix账户
echo "请在所有MySQL实例中添加zabbix账户，执行> GRANT PROCESS ON *.* TO 'zabbix'@'127.0.0.1' identified BY 'zabbix';flush privileges;"
# 重启agent服务
[ -f '/etc/init.d/zabbix-agent' ] && /etc/init.d/zabbix-agent restart || echo "需手动重启zabbix agent服务."
# 授权zabbix用户无密码运行netstat命令
chmod +w /etc/sudoers 
sed -i 's/^\(Defaults\s\+requiretty\)/#\1/' /etc/sudoers
grep -q '^zabbix ALL=(ALL).*netstat' /etc/sudoers || echo 'zabbix ALL=(ALL)     NOPASSWD: /bin/netstat' >> /etc/sudoers
chmod 440 /etc/sudoers
# 关闭SELinux
setenforce 0
sed -i '/^SELINUX=/c\SELINUX=disabled' /etc/sysconfig/selinux
sed -i '/^SELINUX=/c\SELINUX=disabled' /etc/selinux/config

　　脚本执行完毕后，还需要手动MySQL授权，在所有实例中添加zabbix账户：

mysql> GRANT PROCESS ON *.* TO 'zabbix'@'127.0.0.1' identified BY 'zabbix';
mysql> flush privileges;

　　在zabbix server端执行zabbix_get命令测试：

shell# zabbix_get -s 115.238.xxx.xxx -k 'mysql_port_discovery[mysql]'
{
  "data":[
    {"{#MYSQLPORT}":"3306"}
  ]
}
shell# zabbix_get -s 115.238.xxx.xxx -k 'mysql_status[3306,Uptime]'
1295092
shell# zabbix_get -s 115.238.xxx.xxx -k 'mysql_ping[3306]'
1

　　都能返回数据，说明客户端的MySQL监控部署好了。

　　    二、WEB端
　　1、导入模板
　　下载附件模板文件(Template App MySQL used LLD.xml)后，导入到zabbix里。

　　2、创建主机并链接模板

　　3、数据展示