【prometheus】- Blackbox_exporter监控web页面

Blackbox_exporter概述

blackbox exporter是允许在

HTTP

,

HTTPS

,

DNS

,

TCP

and

ICMP

等协议的端点进行黑盒探测的采取器

官方github: https://github.com/prometheus/blackbox_exporter

Blackbox_exporter 部署

blackbox exporter二进制部署

获取包

wget https://github.com/prometheus/blackbox_exporter/releases/download/v0.12.0/blackbox_exporter-0.12.0.linux-amd64.tar.gz scp blackbox_exporter monitor:/usr/local/bin/

创建用户

useradd -M -u 8004 -s /sbin/nologin blackbox_exporter
chown blackbox_exporter.blackbox_exporter /usr/local/bin/blackbox_exporter
mkdir /etc/blackbox_exporter
chown -R blackbox_exporter.blackbox_exporter /etc/blackbox_exporter/

服务启动脚本

cat >> /usr/lib/systemd/system/blackbox_exporter.service << EOF
[Unit]
Description=Prometheus blackbox exporter
After=local-fs.target network-online.target network.target
Wants=local-fs.target network-online.target network.target

[Service]
User=blackbox_exporter
Group=blackbox_exporter
Type=simple
ExecStart=/usr/local/bin/blackbox_exporter \\
--config.file=/etc/blackbox_exporter/blackbox.yml
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

启动服务

systemctl daemon-reload
systemctl enable blackbox_exporter
systemctl start blackbox_exporter

docker方式部署

git clone https://github.com/prometheus/blackbox_exporter.git docker build -t blackbox_exporter .
docker run -d -p 9115:9115 --name blackbox_exporter -v `pwd`:/config blackbox_exporter --config.file=/config/blackbox.yml

blackbox_exporter configure

配置文件为

/etc/blackbox_exporter/blackbox.yml

blackbox_exporter通过配置文件和命令行标志（例如要加载什么配置文件，监听哪个端口以及日志记录格式和级别）进行配置。

同时可以运行时动态的重新加载配置文件，当重新加载配置文件失败时，不影响在运行的配置

重载方式：

curl -XPOST http://127.0.0.1:9115/-/reload[/code] 
blackbox_ex
4000
porter 的超时时间由Prometheus配置中的scrape_timeout自动确定，略微减少以允许网络延迟.默认是10s

示例配置:
https://github.com/prometheus/blackbox_exporter/blob/master/example.yml

监控http
vim /etc/blackbox_exporter/blackbox.yml
modules:
http_2xx:  # http 监测模块
prober: http
http:
http_post_2xx: # http post 监测模块
prober: http
http:
method: POST
tcp_connect: # tcp 监测模块
prober: tcp
ping: # icmp 检测模块
prober: icmp
timeout: 5s
icmp:
preferred_ip_protocol: "ip4"


一般情况下都会以非root用户运行blackbox_exporter,Wie了使用icmp prober，需要设置CAP_NET_RAW，即对可执行文件blackbox_exporter执行下面的命令：setcap cap_net_raw+ep /usr/local/bin/blackbox_exporter

prometheus configure
- job_name: 'http_k8s_master'
scrape_interval: 30s
metrics_path: /probe
params:
module: [http_2xx]
static_configs:
- targets:
- http://api.k8s.love - http://api.local:8675 relabel_configs:
- source_labels: [__address__]
target_label: __param_target
- source_labels: [__param_target]
target_label: instance
- target_label: __address__
replacement: monitor:9115
curl -XPOST http://127.0.0.1:9090/-/reload[/code] 
参考
http://blog.fleeto.us/content/kubernetes-blackbox-shi-xian-dui-web-he-dns-de-jian-dan-jian-kong

https://github.com/prometheus/blackbox_exporter/blob/master/CONFIGURATION.md