Prometheus_exporter安裝與使用

• 2021 年 12 月 4 日
• 筆記
• Prometheus

Promethues概述：可以看一下更詳細的介紹，以下為轉載的博客，原文鏈接,支持原創，請多多支持！！:閆世成的博客園

Prometheus-node-exporter

1、簡介：

• 內核公開的硬件和操作系統指標的 Prometheus 導出器，用 Go 編寫，帶有可插入的指標收集器。

2、安裝部署：

wget //github.com/prometheus/node_exporter/releases/download/v1.2.2/node_exporter-1.2.2.linux-amd64.tar.gz
tar xf node_exporter-1.2.2.linux-amd64.tar.gz -C /opt/
ln -s node_exporter-1.2.2.linux-amd64 node_exporter
配置文件
cat > /usr/lib/systemd/system/node_exporter.service << EOF
[Unit]
Description=Node Exporter
Wants=network-online.target
After=network-online.target
[Service]
ExecStart=/opt/node_exporter/node_exporter
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=node_exporter
[Install]
WantedBy=default.target
EOF
systemctl start node_exporter.service 
ss -lnt瀏覽器訪問//192.168.168.106:9100/metrics

3、瀏覽器訪問：

//192.168.117.128:9100/metrics

4、node_exporter黑白名單

• 黑名單：不採集某一個指標的信息

--no-collector.<name> flag
例如不採集CPU信息
 ./node_exporter --no-collector.cpu

• 白名單：設置node_exporter只採集某些採集項

--collector.disable-defaults --collector.<name> 
# 只開啟mem採集
 ./node_exporter --collector.disable-defaults --collector.meminfo
# 只開啟mem 和cpu 採集
./node_exporter --collector.disable-defaults --collector.meminfo --collector.cpu

4、node_exporter各個指標含義

• 訪問自身的http情況

# HELP promhttp_metric_handler_errors_total Total number of internal errors encountered by the promhttp metric handler.
# TYPE promhttp_metric_handler_errors_total counter
promhttp_metric_handler_errors_total{cause="encoding"} 0
promhttp_metric_handler_errors_total{cause="gathering"} 0
# HELP promhttp_metric_handler_requests_in_flight Current number of scrapes being served.
# TYPE promhttp_metric_handler_requests_in_flight gauge
promhttp_metric_handler_requests_in_flight 1
# HELP promhttp_metric_handler_requests_total Total number of scrapes by HTTP status code.
# TYPE promhttp_metric_handler_requests_total counter
promhttp_metric_handler_requests_total{code="200"} 0
promhttp_metric_handler_requests_total{code="500"} 0
promhttp_metric_handler_requests_total{code="503"} 0

Prometheus監控mysql

mysql_exporter是用來收集MysQL或者Mariadb數據庫相關指標的,mysql_exporter需要連接到數據庫並有相關權限

1、Mysql創建權限賬戶

1、mysql -uroot -p123456
2、CREATE USER 'zhangsan'@'localhost' IDENTIFIED BY 'super';
3、GRANT PROCESS, REPLICATION CLIENT, SELECT ON *.* TO 'zhangsan'@'localhost';
4、FLUSH PRIVILEGES;

2、部署

下載軟件：
1、wget //github.com/prometheus/mysqld_exporter/releases/download/v0.13.0/mysqld_exporter-0.13.0.linux-amd64.tar.gz
2、tar xf mysqld_exporter-0.13.0.linux-amd64.tar.gz -C /opt/
3、ln -s /opt/mysqld_exporter-0.13.0.linux-amd64 /opt/mysqld_exporter

3、準備啟動文件

[root@ops opt]# cat /usr/lib/systemd/system/mysqld_exporter.service 
[Unit]
Description=mysqld_exporter Exporter
Wants=network-online.target
After=network-online.target
[Service]
Environment=DATA_SOURCE_NAME=exporter:devops@tcp/
ExecStart=/opt/mysqld_exporter/mysqld_exporter
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=mysqld_exporter
[Install]
WantedBy=default.target

4、啟動服務

systemctl start mysqld_exporter.service 
systemctl enable mysqld_exporter.service
systemctl status mysqld_exporter.service