prometheus 监控mysql_Prometheus 监控MySQL

0、简介

文中主要监控MySQL/MySQL主从信息

版本：mysql-5.7，mysql_exporter-0.12.1

1、mysql_exporter部署

1.下载mysql_exporter并解压

$ tar xf /opt/src/mysqld_exporter-0.12.1.linux-amd64.tar.gz

// 将mysql_exporter二进制文件拷贝至/usr/local/bin

$ cp /opt/src/mysqld_exporter-0.12.1.linux-amd64/mysqld_exporter /usr/local/bin/

2.需要授权用户给exporter使用

> CREATE USER 'exporter'@'localhost' IDENTIFIED BY 'abc12345' WITH MAX_USER_CONNECTIONS 5;

// 可查看主从运行情况查看线程，及所有数据库。

> GRANT PROCESS, REPLICATION CLIENT, SELECT ON *.* TO 'exporter'@'localhost';

为该用户设置最大连接数为了避免监控数据过大导致服务器超载

3.修改mysql配置文件，添加刚才创建的exporter用户和密码

$ vim /etc/my.cnf

[client]

user=exporter

password=abc12345

4.启动exporter客户端，需指定mysql配置文件，读取exporter用户和密码

$ mysqld_exporter --config.my-cnf=/etc/my.cnf

常用参数：

// 选择采集innodb

--collect.info_schema.innodb_cmp

// innodb存储引擎状态

--collect.engine_innodb_status

// 指定配置文件

--config.my-cnf="/etc/my.cnf"

5.添加system系统服务

$ vim /usr/lib/systemd/system/mysql_exporter.service

[Unit]

Description=Prometheus

Wants=network-online.target

After=network-online.target

[Service]

User=root

Group=root

Type=simple

ExecStart=/usr/local/bin/mysqld_exporter \

--config.my-cnf=/etc/my.cnf

[Install]

WantedBy=multi-user.target

6.启动添加的system服务

$ systemctl daemon-reload

$ systemctl start mysql_exporter.service

$ systemctl enable mysql_exporter.service

// mysql_export默认端口 - 9104

$ netstat -lntup | grep "9104"

tcp6 0 0 :::9104 :::* LISTEN 34137/mysqld_export

7.curl查看捕获mysql数据

curl http://localhost:9104/metrics

8.prometheus配置加入mysql节点

$ vim /usr/local/prometheus/prometheus.yml

- job_name: 'mysql'

scrape_interval: 5s

# 静态添加node

static_configs:

- targets: ['10.4.7.12:9104']

9.查看监控端是否接入

10.Granfana导入MySQL监控图表

去grafana dashboard下载对应的图表或者直接在grafana导入图表输入ID下载

图表下载地址：https://grafana.com/grafana/dashboards/7362

图表ID：11796

11.查看mysql dashboard

2、mysql报警规则

1.配置alertmanager报警,添加prometheus配置：

rule_files:

...

- "/data/etc/mysql*.rules"

2.配置mysql报警规则

groups:

- name: MySQLStatsAlert

rules:

- alert: MySQL is down

expr: mysql_up == 0

for: 1m

labels:

severity: critical

annotations:

summary: "Instance {{ $labels.instance }} MySQL is down"

description: "MySQL database is down. This requires immediate action!"

- alert: open files high

expr: mysql_global_status_innodb_num_open_files > (mysql_global_variables_open_files_limit) * 0.75

for: 1m

labels:

severity: warning

annotations:

summary: "Instance {{ $labels.instance }} open files high"

description: "Open files is high. Please consider increasing open_files_limit."

- alert: Read buffer size is bigger than max. allowed packet size

expr: mysql_global_variables_read_buffer_size > mysql_global_variables_slave_max_allowed_packet

for: 1m

labels:

severity: warning

annotations:

summary: "Instance {{ $labels.instance }} Read buffer size is bigger than max. allowed packet size"

description: "Read buffer size (read_buffer_size) is bigger than max. allowed packet size (max_allowed_packet).This can break your replication."

- alert: Sort buffer possibly missconfigured

expr: mysql_global_variables_innodb_sort_buffer_size <256*1024 or mysql_global_variables_read_buffer_size > 4*1024*1024

for: 1m

labels:

severity: warning

annotations:

summary: "Instance {{ $labels.instance }} Sort buffer possibly missconfigured"

description: "Sort buffer size is either too big or too small. A good value for sort_buffer_size is between 256k and 4M."

- alert: Thread stack size is too small

expr: mysql_global_variables_thread_stack <196608

for: 1m

labels:

severity: warning

annotations:

summary: "Instance {{ $labels.instance }} Thread stack size is too small"

description: "Thread stack size is too small. This can cause problems when you use Stored Language constructs for example. A typical is 256k for thread_stack_size."

- alert: Used more than 80% of max connections limited

expr: mysql_global_status_max_used_connections > mysql_global_variables_max_connections * 0.8

for: 1m

labels:

severity: warning

annotations:

summary: "Instance {{ $labels.instance }} Used more than 80% of max connections limited"

description: "Used more than 80% of max connections limited"

- alert: InnoDB Force Recovery is enabled

expr: mysql_global_variables_innodb_force_recovery != 0

for: 1m

labels:

severity: warning

annotations:

summary: "Instance {{ $labels.instance }} InnoDB Force Recovery is enabled"

description: "InnoDB Force Recovery is enabled. This mode should be used for data recovery purposes only. It prohibits writing to the data."

- alert: InnoDB Log File size is too small

expr: mysql_global_variables_innodb_log_file_size < 16777216

for: 1m

labels:

severity: warning

annotations:

summary: "Instance {{ $labels.instance }} InnoDB Log File size is too small"

description: "The InnoDB Log File size is possibly too small. Choosing a small InnoDB Log File size can have significant performance impacts."

- alert: InnoDB Flush Log at Transaction Commit

expr: mysql_global_variables_innodb_flush_log_at_trx_commit != 1

for: 1m

labels:

severity: warning

annotations:

summary: "Instance {{ $labels.instance }} InnoDB Flush Log at Transaction Commit"

description: "InnoDB Flush Log at Transaction Commit is set to a values != 1. This can lead to a loss of commited transactions in case of a power failure."

- alert: Table definition cache too small

expr: mysql_global_status_open_table_definitions > mysql_global_variables_table_definition_cache

for: 1m

labels:

severity: page

annotations:

summary: "Instance {{ $labels.instance }} Table definition cache too small"

description: "Your Table Definition Cache is possibly too small. If it is much too small this can have significant performance impacts!"

- alert: Table open cache too small

expr: mysql_global_status_open_tables >mysql_global_variables_table_open_cache * 99/100

for: 1m

labels:

severity: page

annotations:

summary: "Instance {{ $labels.instance }} Table open cache too small"

description: "Your Table Open Cache is possibly too small (old name Table Cache). If it is much too small this can have significant performance impacts!"

- alert: Thread stack size is possibly too small

expr: mysql_global_variables_thread_stack < 262144

for: 1m

labels:

severity: page

annotations:

summary: "Instance {{ $labels.instance }} Thread stack size is possibly too small"

description: "Thread stack size is possibly too small. This can cause problems when you use Stored Language constructs for example. A typical is 256k for thread_stack_size."

- alert: InnoDB Buffer Pool Instances is too small

expr: mysql_global_variables_innodb_buffer_pool_instances == 1

for: 1m

labels:

severity: page

annotations:

summary: "Instance {{ $labels.instance }} InnoDB Buffer Pool Instances is too small"

description: "If you are using MySQL 5.5 and higher you should use several InnoDB Buffer Pool Instances for performance reasons. Some rules are: InnoDB Buffer Pool Instance should be at least 1 Gbyte in size. InnoDB Buffer Pool Instances you can set equal to the number of cores of your machine."

- alert: InnoDB Plugin is enabled

expr: mysql_global_variables_ignore_builtin_innodb == 1

for: 1m

labels:

severity: page

annotations:

summary: "Instance {{ $labels.instance }} InnoDB Plugin is enabled"

description: "InnoDB Plugin is enabled"

- alert: Binary Log is disabled

expr: mysql_global_variables_log_bin != 1

for: 1m

labels:

severity: warning

annotations:

summary: "Instance {{ $labels.instance }} Binary Log is disabled"

description: "Binary Log is disabled. This prohibits you to do Point in Time Recovery (PiTR)."

- alert: Binlog Cache size too small

expr: mysql_global_variables_binlog_cache_size < 1048576

for: 1m

labels:

severity: page

annotations:

summary: "Instance {{ $labels.instance }} Binlog Cache size too small"

description: "Binlog Cache size is possibly to small. A value of 1 Mbyte or higher is OK."

- alert: Binlog Statement Cache size too small

expr: mysql_global_variables_binlog_stmt_cache_size <1048576 and mysql_global_variables_binlog_stmt_cache_size > 0

for: 1m

labels:

severity: page

annotations:

summary: "Instance {{ $labels.instance }} Binlog Statement Cache size too small"

description: "Binlog Statement Cache size is possibly to small. A value of 1 Mbyte or higher is typically OK."

- alert: Binlog Transaction Cache size too small

expr: mysql_global_variables_binlog_cache_size <1048576

for: 1m

labels:

severity: page

annotations:

summary: "Instance {{ $labels.instance }} Binlog Transaction Cache size too small"

description: "Binlog Transaction Cache size is possibly to small. A value of 1 Mbyte or higher is typically OK."

- alert: Sync Binlog is enabled

expr: mysql_global_variables_sync_binlog == 1

for: 1m

labels:

severity: page

annotations:

summary: "Instance {{ $labels.instance }} Sync Binlog is enabled"

description: "Sync Binlog is enabled. This leads to higher data security but on the cost of write performance."

- alert: IO thread stopped

expr: mysql_slave_status_slave_io_running != 1

for: 1m

labels:

severity: critical

annotations:

summary: "Instance {{ $labels.instance }} IO thread stopped"

description: "IO thread has stopped. This is usually because it cannot connect to the Master any more."

- alert: SQL thread stopped

expr: mysql_slave_status_slave_sql_running == 0

for: 1m

labels:

severity: critical

annotations:

summary: "Instance {{ $labels.instance }} SQL thread stopped"

description: "SQL thread has stopped. This is usually because it cannot apply a SQL statement received from the master."

- alert: SQL thread stopped

expr: mysql_slave_status_slave_sql_running != 1

for: 1m

labels:

severity: critical

annotations:

summary: "Instance {{ $labels.instance }} Sync Binlog is enabled"

description: "SQL thread has stopped. This is usually because it cannot apply a SQL statement received from the master."

- alert: Slave lagging behind Master

expr: rate(mysql_slave_status_seconds_behind_master[1m]) >30

for: 1m

labels:

severity: warning

annotations:

summary: "Instance {{ $labels.instance }} Slave lagging behind Master"

description: "Slave is lagging behind Master. Please check if Slave threads are running and if there are some performance issues!"

- alert: Slave is NOT read only(Please ignore this warning indicator.)

expr: mysql_global_variables_read_only != 0

for: 1m

labels:

severity: page

annotations:

summary: "Instance {{ $labels.instance }} Slave is NOT read only"

description: "Slave is NOT set to read only. You can accidentally manipulate data on the slave and get inconsistencies..."

3.最后需要重启prometheus即可