笺注:这是在 CentOS8编译安装Zabbix4.4.5 的基础上进行的,监控本机的MariaDB
配置本机的MariaDB数据库:( 使用数据库管理员root@localhost )
[root@centos8 ~]# mysql -u"root" -h"localhost"
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 100
Server version: 10.3.17-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
注释:
此时,数据库管理员root@localhost没有设置密码;
-h"localhost" 是可以省略的;
查看当前登录的数据库用户:
MariaDB [(none)]> Select user();
+----------------+
| user() |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.001 sec)
MariaDB [(none)]>
再授权数据库用户zbx_monitor@localhost(数据库用户可以不要密码的),只能本地登录,对所有的库有完全控制的权限:
MariaDB [(none)]> create user zbx_monitor@localhost;
Query OK, 0 rows affected (0.001 sec)
MariaDB [(none)]> grant all on *.* to zbx_monitor@localhost;
Query OK, 0 rows affected (0.000 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.001 sec)
MariaDB [(none)]>
查看本地数据库用户zbx_monitor@localhost的权限:
MariaDB [(none)]> show grants for zbx_monitor@localhost;
+----------------------------------------------------------+
| Grants for zbx_monitor@localhost |
+----------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'zbx_monitor'@'localhost' |
+----------------------------------------------------------+
1 row in set (0.001 sec)
MariaDB [(none)]>
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修改Zabbix服务器的Agent配置文件:
[root@centos8 ~]# find / -name zabbix_agentd.conf
/root/zabbix-4.4.5/conf/zabbix_agentd.conf
/usr/local/zabbix/etc/zabbix_agentd.conf
[root@centos8 ~]#
[root@centos8 ~]# vi /usr/local/zabbix/etc/zabbix_agentd.conf
# UnsafeUserParameters=0
修改为:(启用该功能)
UnsafeUserParameters=1
接着插入:
UserParameter=mysql.get_status_variables[*], mysql -u"zbx_monitor" -h"$1" -P"$2" -sNX -e "show global status"
UserParameter=mysql.version[*], mysqladmin -u"zbx_monitor" -s -h"$1" -P"$2" version
UserParameter=mysql.db.discovery[*], mysql -u"zbx_monitor" -h"$1" -P"$2" -sN -e "show databases"
UserParameter=mysql.dbsize[*], mysql -u"zbx_monitor" -h"$1" -P"$2" -sN -e "SELECT SUM(DATA_LENGTH + INDEX_LENGTH) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA='$3'"
UserParameter=mysql.replication.discovery[*], mysql -u"zbx_monitor" -h"$1" -P"$2" -sNX -e "show slave status"
UserParameter=mysql.slave_status[*], mysql -u"zbx_monitor" -h"$1" -P"$2" -sNX -e "show slave status"
保存好配置文件后,重启一下Zabbix本机的客户端和服务端:
pkill -9 -U zabbix
/usr/local/zabbix/sbin/zabbix_agentd
/usr/local/zabbix/sbin/zabbix_server
本地测试:
使用命令mysqladmin检测MariaDB服务有没有在运行中:(没有运行时)
[root@centos8 ~]# systemctl stop mysql
[root@centos8 ~]#
[root@centos8 ~]# mysqladmin -u"zbx_monitor" ping
mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)'
Check that mysqld is running and that the socket: '/var/lib/mysql/mysql.sock' exists!
[root@centos8 ~]#
使用命令mysqladmin检测MariaDB服务有没有在运行中:(在运行时)
[root@centos8 ~]# systemctl start mysql
[root@centos8 ~]#
[root@centos8 ~]# mysqladmin -u"zbx_monitor" ping
mysqld is alive
[root@centos8 ~]#
使用命令mysqladmin查看MariaDB的版本信息等等:
[root@centos8 ~]# mysqladmin -u"zbx_monitor" -s version
mysqladmin Ver 9.1 Distrib 10.3.17-MariaDB, for Linux on x86_64
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Server version 10.3.17-MariaDB
Protocol version 10
Connection Localhost via UNIX socket
UNIX socket /var/lib/mysql/mysql.sock
Uptime: 170 days 22 hours 10 min 2 sec
Threads: 33 Questions: 58590 Slow queries: 0 Opens: 140 Flush tables: 1 Open tables: 134 Queries per second avg: 0.003
[root@centos8 ~]#
注释:这里可以看到目前MariaDB服务运行了170天22小时10分2秒;
使用命令mysql显示MariaDB里的全部库:
[root@centos8 ~]# mysql -u"zbx_monitor" -sN -e "show databases"
db1
information_schema
mysql
performance_schema
zabbix
[root@centos8 ~]#
使用命令mysql显示库zabbix的大小:(返回值以字节为单位;不保留小数;使用模板的格式)
[root@centos8 ~]# mysql -u"zbx_monitor" -h"localhost" -P"3306" -sN -e "SELECT SUM(DATA_LENGTH + INDEX_LENGTH) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA='zabbix'"
15548416
[root@centos8 ~]#
使用命令mysql显示库zabbix的大小:(返回值以字节为单位;保留两位小数,是四舍五入)
[root@centos8 ~]# mysql -u"zbx_monitor" -h"localhost" -P"3306" -sN -e "select concat(round(sum(DATA_LENGTH),2)) as data from information_schema.TABLES where table_schema = 'zabbix';"
9764864.00
[root@centos8 ~]#
[root@centos8 ~]# mysql -u"zbx_monitor" -h"localhost" -P"3306" -sN -e "select concat(round(sum(DATA_LENGTH + INDEX_LENGTH),2)) as data from information_schema.TABLES where table_schema = 'zabbix';"
15548416.00
[root@centos8 ~]#
使用命令mysql显示库zabbix的大小:(返回值以MB为单位;保留两位小数,是四舍五入)
[root@centos8 ~]# mysql -u"zbx_monitor" -h"localhost" -P"3306" -sN -e "select concat(round(sum(DATA_LENGTH/1024/1024),2)) as data from information_schema.TABLES where table_schema = 'zabbix';"
9.31
[root@centos8 ~]#
[root@centos8 ~]# mysql -u"zbx_monitor" -h"localhost" -P"3306" -sN -e "select concat(round(sum(DATA_LENGTH/1024/1024 + INDEX_LENGTH/1024/1024),2)) as data from information_schema.TABLES where table_schema = 'zabbix';"
14.83
[root@centos8 ~]#
注释:
data_length + index_length 等于库的表的总大小:
data_length: 数据的实际大小
index_length: 表索引的大小
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在Zabbix服务器测试,验证能否获取本机(127.0.0.1)的键值:
检测本机MariaDB服务有没有在运行中:(没有运行时)
[root@centos8 ~]# /usr/local/zabbix/bin/zabbix_get -s 127.0.0.1 -k mysql.ping["localhost","3306"]
mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)'
Check that mysqld is running and that the socket: '/var/lib/mysql/mysql.sock' exists!
[root@centos8 ~]#
检测本机MariaDB服务有没有在运行中:(在运行时)
[root@centos8 ~]# /usr/local/zabbix/bin/zabbix_get -s 127.0.0.1 -k mysql.ping["localhost","3306"]
mysqld is alive
[root@centos8 ~]#
输出本机MariaDB里的全部库:
[root@centos8 ~]# /usr/local/zabbix/bin/zabbix_get -s 127.0.0.1 -k mysql.db.discovery["localhost","3306"]
db1
information_schema
mysql
performance_schema
zabbix
[root@centos8 ~]#
##################Zabbix添加被监控主机:
配置》主机》创建主机(主机名称无需与被监控主机的真实主机名一致;群组可以随便选)