运维监控系统之Prometheus-MySQL监控

湛蓝之海

Prometheus 是一个开源的服务监控系统和时间序列数据库。本文主要为大家介绍运维监控系统之Prometheus-MySQL监控，有需要的朋友可以参考下
简介
mysqld_exporter是用于获取mysql实例的指标服务。
安装

mysql授权

CREATE USER exporter@localhost identified by "mima"; 
GRANT PROCESS, REPLICATION CLIENT, SELECT ON *.* TO 'exporter'@'localhost' WITH MAX_USER_CONNECTIONS 3; 
flush privileges;

直接通过命令下载就可以了。

wget -t 1000 -c https://github.com/prometheus/mysqld_exporter/releases/download/v0.12.1/mysqld_exporter-0.12.1.linux-amd64.tar.gz 
tar zxvf  mysqld_exporter-0.12.1.linux-amd64.tar.gz -C /opt/ 
cd /opt/mysqld_exporter-0.12.1.linux-amd64 
export DATA_SOURCE_NAME='exporter:mima@(localhost:3306)/' 
./mysqld_exporter

这里设置用户名密码是通过环境变量的形式，也可以用配置文件，默认找的配置文件是~/.my.cnf，也可以使用参数--config.my-cnf="/opt/mysqld_exporter/.my.cnf" 进行设置。

./mysqld_exporter --config.my-cnf="/opt/mysqld_exporter/.my.cnf"

其他参数

usage: mysqld_exporter [<flags>] 
 
Flags: 
  -h, --help           Show context-sensitive help (also try --help-long and --help-man). 
    --exporter.lock_wait_timeout=2   
                 Set a lock_wait_timeout on the connection to avoid long metadata locking. 
    --exporter.log_slow_filter   
                 Add a log_slow_filter to avoid slow query logging of scrapes. NOTE: Not supported by Oracle MySQL. 
    --collect.heartbeat.database="heartbeat"   
                 Database from where to collect heartbeat data 
    --collect.heartbeat.table="heartbeat"   
                 Table from where to collect heartbeat data 
    --collect.info_schema.processlist.min_time=0   
                 Minimum time a thread must be in each state to be counted 
    --collect.info_schema.processlist.processes_by_user   
                 Enable collecting the number of processes by user 
    --collect.info_schema.processlist.processes_by_host   
                 Enable collecting the number of processes by host 
    --collect.info_schema.tables.databases="*"   
                 The list of databases to collect table stats for, or '*' for all 
    --collect.mysql.user.privileges   
                 Enable collecting user privileges from mysql.user 
    --collect.perf_schema.eventsstatements.limit=250   
                 Limit the number of events statements digests by response time 
    --collect.perf_schema.eventsstatements.timelimit=86400   
                 Limit how old the 'last_seen' events statements can be, in seconds 
    --collect.perf_schema.eventsstatements.digest_text_limit=120   
                 Maximum length of the normalized statement text 
    --collect.perf_schema.file_instances.filter=".*"   
                 RegEx file_name filter for performance_schema.file_summary_by_instance 
    --collect.perf_schema.file_instances.remove_prefix="/var/lib/mysql/"   
                 Remove path prefix in performance_schema.file_summary_by_instance 
    --web.listen-address=":9104"   
                 Address to listen on for web interface and telemetry. 
    --web.telemetry-path="/metrics"   
                 Path under which to expose metrics. 
    --timeout-offset=0.25  Offset to subtract from timeout in seconds. 
    --config.my-cnf="/home/jalright/.my.cnf"   
                 Path to .my.cnf file to read MySQL credentials from. 
    --collect.mysql.user   Collect data from mysql.user 
    --collect.info_schema.tables   
                 Collect metrics from information_schema.tables 
    --collect.info_schema.innodb_tablespaces   
                 Collect metrics from information_schema.innodb_sys_tablespaces 
    --collect.info_schema.innodb_metrics   
                 Collect metrics from information_schema.innodb_metrics 
    --collect.global_status  Collect from SHOW GLOBAL STATUS 
    --collect.global_variables   
                 Collect from SHOW GLOBAL VARIABLES 
    --collect.slave_status   Collect from SHOW SLAVE STATUS 
    --collect.info_schema.processlist   
                 Collect current thread state counts from the information_schema.processlist 
    --collect.perf_schema.tablelocks   
                 Collect metrics from performance_schema.table_lock_waits_summary_by_table 
    --collect.perf_schema.eventsstatements   
                 Collect metrics from performance_schema.events_statements_summary_by_digest 
    --collect.perf_schema.eventsstatementssum   
                 Collect metrics of grand sums from performance_schema.events_statements_summary_by_digest 
    --collect.perf_schema.eventswaits   
                 Collect metrics from performance_schema.events_waits_summary_global_by_event_name 
    --collect.auto_increment.columns   
                 Collect auto_increment columns and max values from information_schema 
    --collect.binlog_size  Collect the current size of all registered binlog files 
    --collect.perf_schema.tableiowaits   
                 Collect metrics from performance_schema.table_io_waits_summary_by_table 
    --collect.perf_schema.indexiowaits   
                 Collect metrics from performance_schema.table_io_waits_summary_by_index_usage 
    --collect.info_schema.userstats   
                 If running with userstat=1, set to true to collect user statistics 
    --collect.info_schema.clientstats   
                 If running with userstat=1, set to true to collect client statistics 
    --collect.info_schema.tablestats   
                 If running with userstat=1, set to true to collect table statistics 
    --collect.info_schema.schemastats   
                 If running with userstat=1, set to true to collect schema statistics 
    --collect.perf_schema.file_events   
                 Collect metrics from performance_schema.file_summary_by_event_name 
    --collect.perf_schema.file_instances   
                 Collect metrics from performance_schema.file_summary_by_instance 
    --collect.perf_schema.replication_group_member_stats   
                 Collect metrics from performance_schema.replication_group_member_stats 
    --collect.perf_schema.replication_applier_status_by_worker   
                 Collect metrics from performance_schema.replication_applier_status_by_worker 
    --collect.engine_innodb_status   
                 Collect from SHOW ENGINE INNODB STATUS 
    --collect.heartbeat    Collect from heartbeat 
    --collect.slave_hosts  Scrape information from 'SHOW SLAVE HOSTS' 
    --collect.info_schema.innodb_cmp   
                 Collect metrics from information_schema.innodb_cmp 
    --collect.info_schema.innodb_cmpmem   
                 Collect metrics from information_schema.innodb_cmpmem 
    --collect.info_schema.query_response_time   
                 Collect query response time distribution if query_response_time_stats is ON. 
    --collect.engine_tokudb_status   
                 Collect from SHOW ENGINE TOKUDB STATUS 
    --log.level="info"     Only log messages with the given severity or above. Valid levels: [debug, info, warn, error, fatal] 
    --log.format="logger:stderr"   
                 Set the log target and format. Example: "logger:syslog?appname=bob&local=7" or "logger:stdout?json=true" 
    --version        Show application version.

部署服务
直接注册成systemd服务。

```bash 
#!/bin/bash 
 
VERSION="0.12.1" 
 
wget  -t 100  -c  https://github.com/prometheus/mysqld_exporter/releases/download/v${VERSION}/mysqld_exporter-${VERSION}.linux-amd64.tar.gz 
 
if [ ! -e mysqld_exporter-${VERSION}.linux-amd64.tar.gz ] 
then 
  echo "安装包下载失败" 
  exit 1 
fi 
tar xvfz mysqld_exporter-${VERSION}.linux-amd64.tar.gz -C /opt/ 
cd /opt 
ln -s mysqld_exporter-${VERSION}.linux-amd64  mysqld_exporter 
cat > /etc/systemd/system/mysqld_exporter.service <<EOF 
 
[Unit] 
Description=mysqld_exporter 
After=network.target 
 
[Service] 
Type=simple 
WorkingDirectory=/opt/mysqld_exporter 
ExecStart=/opt/mysqld_exporter/mysqld_exporter --config.my-cnf="/opt/mysqld_exporter/.my.cnf" 
LimitNOFILE=65536 
PrivateTmp=true 
RestartSec=2 
StartLimitInterval=0 
Restart=always 
 
[Install] 
WantedBy=multi-user.target 
EOF 
​``` 
systemctl daemon-reload 
systemctl enable mysqld_exporter 
systemctl start mysqld_exporter

配置prometheus Job
默认端口是9104

- job_name: 'mysqld_exporter' 
 
  # metrics_path defaults to '/metrics' 
  # scheme defaults to 'http'. 
 
  static_configs: 
  - targets: ['localhost:9104']

指标展示
指标可以通过prometheus的WebUI进行查看

http://[promethe server ip]:9090

如果需要画图，可以直接使用grafana，有人已经配置好了图形可以通过grafana官方下的dashboard找到mysqld_exporter相关的dashboard就可以直接使用了，配置好prometheus数据源，直接导入grafana就可以直接展示了。

原文地址：https://www.toutiao.com/i6911310105698943491/