zabbix agent 3.4 已经默认支持监控，只需要简单配置。

  1. 首先需要给MySQL设置一个zabbix读取数据的用户及密码（过程省略）；

    注意，这个用户不需要任何权限，登陆IP仅限localhost即可

  2. 把MySQL的用户信息写入到zabbix能读到的位置；

    默认源安装的情况，即放置一个.my.cnf文件至/etc/zabbix/目录下

    # /etc/zabbix/.my.cnf

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    [mysql]
    host=localhost
    user=zabbix
    password=zabbix
    socket=/var/lib/mysql/mysql.sock
    [mysqladmin]
    host=localhost
    user=zabbix
    password=zabbix
    socket=/var/lib/mysql/mysql.sock

  3. 修改zabbix监控MySQL数据库自定义脚本

    注意HOME后面的路径需要是zabbix的配置根目录，存在.my.cnf文件

    # /etc/zabbix/zabbix_agentd.d/userparameter_mysql.conf

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    # For all the following commands HOME should be set to the directory that has .my.cnf file with password information.

    # Flexible parameter to grab global variables. On the frontend side, use keys like mysql.status[Com_insert].
    # Key syntax is mysql.status[variable].
    UserParameter=mysql.status[*],echo "show global status where Variable_name='$1';" | HOME=/etc/zabbix mysql -N | awk '{print $$2}'

    # Flexible parameter to determine database or table size. On the frontend side, use keys like mysql.size[zabbix,history,data].
    # Key syntax is mysql.size[<database>,<table>,<type>].
    # Database may be a database name or "all". Default is "all".
    # Table may be a table name or "all". Default is "all".
    # Type may be "data", "index", "free" or "both". Both is a sum of data and index. Default is "both".
    # Database is mandatory if a table is specified. Type may be specified always.
    # Returns value in bytes.
    # 'sum' on data_length or index_length alone needed when we are getting this information for whole database instead of a single table
    UserParameter=mysql.size[*],bash -c 'echo "select sum($(case "$3" in both|"") echo "data_length+index_length";; data|index) echo "$3_length";; free) echo "data_free";; esac)) from information_schema.tables$([[ "$1" = "all" || ! "$1" ]] || echo " where table_schema=\"$1\"")$([[ "$2" = "all" || ! "$2" ]] || echo "and table_name=\"$2\"");" | HOME=/etc/zabbix mysql -N'

    UserParameter=mysql.ping,HOME=/etc/zabbix mysqladmin ping | grep -c alive
    UserParameter=mysql.version,mysql -V

    UserParameter=mysql.uptime,HOME=/etc/zabbix mysqladmin status | cut -f2 -d ":" | cut -f1 -d "T" | tr -d " "
    UserParameter=mysql.threads,HOME=/etc/zabbix mysqladmin status | cut -f3 -d ":" | cut -f1 -d "Q" | tr -d " "
    UserParameter=mysql.questions,HOME=/etc/zabbix mysqladmin status | cut -f4 -d ":"|cut -f1 -d "S" | tr -d " "
    UserParameter=mysql.slowqueries,HOME=/etc/zabbix mysqladmin status | cut -f5 -d ":" | cut -f1 -d "O" | tr -d " "
    UserParameter=mysql.qps,HOME=/etc/zabbix mysqladmin status | cut -f9 -d ":" | tr -d " "

    测试能否获取到数据：

    agent节点上执行

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    azbbix_agentd -t "mysql.status[Com_update]"

    如果有报错显示

    ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

    很显然，.my.cnf中配置的sock路径不对，找对相应的位置再测试即可。

  4. 最后，重启agent service zabbix-agent restart / systemctl restart zabbix-agent；

    并在zabbix web面板上配置添加MySQL的模板。

  5. 喝杯咖啡☕️，就能看见数据图了。