Prometheus监控mysql

docker-compose.yml 创建mysql

mkdir/data/mysql -p

cat > /data/mysql/docker-compose.yml << 'EOF'
version: '3.1'
services:
  db:
    image: mysql:8.0
    restart: always
    container_name: mysql
    environment:
      TZ: Asia/Shanghai
      LANG: en_US.UTF-8
      MYSQL_ROOT_PASSWORD: 123456
    command:
      --default-authentication-plugin=mysql_native_password
      --character-set-server=utf8mb4
      --collation-server=utf8mb4_general_ci
      --lower_case_table_names=1
      --performance_schema=1
      --sql-mode=""
      --skip-log-bin
    volumes:
      - /data/mysql/data:/var/lib/mysql
    ports:
      - 3306:3306
EOF

docker-compose up -d

监控mysql

创建用户expoerter
docker exec -it mysql mysql -uroot -p123456

```
CREATE USER 'exporter'@'%' IDENTIFIED BY 'password' WITH MAX_USER_CONNECTIONS 3;
GRANT PROCESS,REPLICATION CLIENT,SELECT ON *.* TO 'exporter'@'%';
```
docker exec -it mysql mysql -uexporter -ppassword

mysqld_exporter 创建

mkdir /data/mysqld_exporter -p
cd /data/mysqld_exporter
cat >docker-compose.yml << 'EOF'
version: '3.3'
services:
  mysqld-exporter:
    image: prom/mysqld-exporter:v0.12.1
    container_name: mysqld-exporter
    restart: always
    command:
      - '--collect.info_schema.processlist'
      - '--collect.info_schema.innodb_metrics'
      - '--collect.info_schema.tablestats'
      - '--collect.info_schema.tables'
      - '--collect.info_schema.userstats'
      - '--collect.engine_innodb_status'
    environment:
      - DATA_SOURCE_NAME=exporter:password@(10.19.1.220:3306)/
    ports:
      - 9104:9104
EOF

docker-compose up -d

增加prometheus/prometheus.yml

  - job_name: 'mysqld-exporter'
    scrape_interval: 30s
    static_configs:
    - targets: ['10.19.1.220:9104']
      labels:
        instance: mysqld服务器

curl -X POST http://localhost:9090/-/reload

触发器设置

cd /opt/data/docker-prometheus

cat >> prometheus/rules/mysqld.yml << 'EOF'
groups:
- name: MYSQL
  rules:
  - alert: MysqlDown
    expr: mysql_up == 0
    for: 30s
    labels:
      severity: critical
    annotations:
      summary: "Mysql Down,实例:{{ $labels.instance }}"
      description: "Mysql_exporter 连不上数据库了，当前状态为{{ $value }}"
EOF

热加载

docker exec -it prometheus promtool check config /etc/prometheus/prometheus.yml
curl -X POST http://localhost:9090/-/reload

dashboard

https://grafana.com/grafana/dashboards/7362