使用zabbix監控mariadb性能狀態

0x01 前言

zabbix內置Mysql的監控模版，由於mariadb和Mysql二者的相關性，因此這個模版也能用在mariadb services上。

0x02 Mysql

首先要在mariadb新建一個帳戶，這個帳戶不須要有任何權限。這個帳戶只是用來登入mariadb獲取服務狀態。

GRANT USAGE ON *.* TO 'zabbix'@'localhost' IDENTIFIED BY 'passwd';
FLUSH PRIVILEGES;

請將如下內容根據實際狀況進行替換：

• user name >>mariadb帳戶名
• server ip >>mariadb服務器IP
• passwd >>mariadb密碼

0x03 Zabbix Agent

完成mariadb的用戶添加後，還要在mariadb服務器安裝Zabbix Agent。經過如下文件能夠得知還須要新建一個文件，並在這個文件內填入mariadb的信息：

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

# 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=/var/lib/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=/var/lib/zabbix mysql -N'

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

而後新建如下文件並進行修改，要注意的是 /var/lib/zabbix 這個路徑可能並不存在，須要手動新建：

#新建文件夾
mkdir -p /var/lib/zabbix

#修改文件
vim /var/lib/zabbix/.my.cnf

#填入內容
[mysql]
user=zabbix
password=zabbix
host=127.0.0.1

[mysqladmin]
user=zabbix
password=zabbix
host=127.0.0.1

完成後須要經過如下命令手動重啓mariadb services和zabbix agent services：

#重啓mariadb
systemctl restart mariadb.service

#重啓zabbix agent
systemctl restart zabbix-agent.service