Step 1 Download blackbox_exporter

download_blackbox.sh

export http_proxy=http://192.168.0.80:8080
export https_proxy=http://192.168.0.80:8080
wget https://github.com/prometheus/blackbox_exporter/releases/download/v0.14.0/blackbox_exporter-0.14.0.linux-amd64.tar.gz

tar -xvf blackbox_exporter-0.14.0.linux-amd64.tar.gz
mv blackbox_exporter-0.14.0.linux-amd64 blackbox

Step 2 Add blackbox.service

edit /etc/systemd/system/blackbox.service

[Unit]
Description=Blackbox Exporter
Wants=network-online.target
After=network-online.target

[Service]
User=root
Grouup=root
Type=simple
ExecStart=/blackbox/path/blackbox_exporter --config.file /blackbox/path/blackbox.yml

[Install]
WantedBy=multi-user.target

Step 3 Edit blackbox.yml

edit /blackbox/path/blackbox.yml

modules:
  tcp_connect:
    prober: tcp
    timeout: 5s
  icmp:
    prober: icmp
    timeout: 5s
    icmp:
      preferred_ip_protocol: ip4

Step 4 Start Service

sysctl -p && systemctl start blackbox.service

Step 5 Go To Prometheus And Setting

edit prometheus.yml

global:
  scrape_interval: 15s
  evaluation_interval: 15s
  external_labels:
    monitor: master
rule_files:
- "/prometheus/path/alert.rules"
scrape_configs:
  - job_name: "blackbox_demo"
    scrape_interval: 30s
    metrics_path: /probe
    params:
      module: [tcp_connect]
    file_sd_configs:
      - files:
        - '/prometheus/path/yaml/blackbox_demo.yml'
    relabel_configs:
      - source_labels: [__address__]
        target_label: __param_target
      - source_labels: [__param_target]
        target_label: instance
      - target_label: __address__
        replacement: 8.8.8.8:9115

edit blackbox_demo.yml (target can use IP or FQDN)

- labels:
    module: tcp_connect
  targets:
    - 11.1.1.1:80
    - 11.1.1.2:443 
    - 11.1.1.3:5672  
    - 11.1.1.4:18964  
    - 11.1.1.5:18964  
    - 11.1.1.6:18964

Step 6 Restart Prometheus Service

systemctl restart prometheus