這篇主要整理作法步驟，此圖講解非常清楚

1. Raspberry pi 安裝 Nginx及擴充module
2. Raspberry pi nginx 增加模組 nginx-module-vts
3. Raspberry pi 安裝 Nginx_vts_exporter
4. Raspberry pi 安裝 Prometheus
5. Raspberry pi 安裝 Grafana

Reference

https://medium.com/@shevtsovav/ready-for-scraping-nginx-metrics-nginx-vts-exporter-prometheus-grafana-26c14816ae7c

https://grafana.com/blog/2019/08/22/homelab-security-with-ossec-loki-prometheus-and-grafana-on-a-raspberry-pi/

直接擴充基本的module

ndk_http_module.so ngx_http_headers_more_filter_module.so
ngx_http_auth_pam_module.so ngx_http_image_filter_module.so ngx_http_xslt_filter_module.so
ngx_http_cache_purge_module.so ngx_http_lua_module.so ngx_mail_module.so
ngx_http_dav_ext_module.so ngx_http_perl_module.so ngx_nchan_module.so
ngx_http_echo_module.so ngx_http_subs_filter_module.so ngx_stream_module.so
ngx_http_fancyindex_module.so ngx_http_uploadprogress_module.so
ngx_http_geoip_module.so ngx_http_upstream_fair_module.so

建議使用此安裝指令方式

$ sudo apt-get nginx nginx-extras nginx-full

再往下新增Grafana Dashboard功能

# 下載 grafana
$ wget wget https://dl.grafana.com/oss/release/grafana-6.5.1.linux-armv7.tar.gz

# 解壓縮
$ tar -zxvf grafana-6.5.1.linux-armv7.tar.gz

# 新增系統服務
$ sudo nano /etc/systemd/system/grafana.service
# 新增以下內容
[Unit]
Description=Grafana UI
After=network.target

[Service]
Type=simple
User=pi
ExecStart=/home/pi/grafana-6.5.1/bin/grafana-server
WorkingDirectory=/home/pi/grafana-6.5.1/
Restart=always
RestartSec=10

[Install]
WantedBy=multi-user.target
 
#完成後，儲存離開
 
# 系統重新讀取服務
$ sudo systemctl daemon-reload
 
# 設定開機自動執行
$ sudo systemctl enable grafana
 
# 啟動prometheus
$ sudo systemctl start grafana
 
# 查詢執行狀況
$ sudo systemctl status grafana

完成後即可以到http://localhost:3000，觀看grafana運行狀況

Default 帳號密碼為 admin/admin

先新增DB

在使用左側＋圖示Create Import

輸入代碼2494，離開輸入框會自動帶入Dashboard資訊

順利完成後如下

Reference

https://medium.com/@shevtsovav/ready-for-scraping-nginx-metrics-nginx-vts-exporter-prometheus-grafana-26c14816ae7c

https://grafana.com/blog/2019/08/22/homelab-security-with-ossec-loki-prometheus-and-grafana-on-a-raspberry-pi/

再往下新增Prometheus功能

# 下載 prometheus
$ wget https://github.com/prometheus/prometheus/releases/download/v2.14.0/prometheus-2.14.0.linux-armv7.tar.gz

# 解壓縮
$ tar -zxvf prometheus-2.14.0.linux-armv7.tar.gz

# 修改 prometheus.yml targets要改成Nginx-vts-exporter輸出網址
$ nano prometheus-2.14.0.linux-armv7/prometheus.yml

# static_configs:
#   - targets: ['localhost:9913']

# 新增系統服務
$ sudo nano /etc/systemd/system/prometheus.service
# 新增以下內容
[Unit]
Description=Prometheus Metrics
After=network.target

[Service]
Type=simple
User=pi
ExecStart=/home/pi/prometheus-2.14.0.linux-armv7/prometheus --storage.tsdb.retention.time=30d
WorkingDirectory=/home/pi/prometheus-2.14.0.linux-armv7/
Restart=always
RestartSec=10

[Install]
WantedBy=multi-user.target
 
#完成後，儲存離開
 
# 系統重新讀取服務
$ sudo systemctl daemon-reload
 
# 設定開機自動執行
$ sudo systemctl enable prometheus
 
# 啟動prometheus
$ sudo systemctl start prometheus
 
# 查詢執行狀況
$ sudo systemctl status prometheus

完成後即可以到http://localhost:9090，觀看prometheus運行狀況

http://localhost:9090/targets

Reference

https://grafana.com/blog/2019/08/22/homelab-security-with-ossec-loki-prometheus-and-grafana-on-a-raspberry-pi/

https://medium.com/@shevtsovav/ready-for-scraping-nginx-metrics-nginx-vts-exporter-prometheus-grafana-26c14816ae7c

再往下新增Nginx_vts_exporter module功能

# 下載nginx-vts-exporter
$ wget https://github.com/hnlq715/nginx-vts-exporter/archive/v0.10.5.tar.gz

# 安裝golang
$ sudo apt update 
$ sudo apt install golang

#解壓縮及安裝
$ tar -xzvf v0.10.5.tar.gz
$ cd nginx-vts-exporter-0.10.5
$ go install nginx_vts_exporter.go

# 查詢 go env 得知GOPATH="/home/pi/go"
$ go env

# 複製程式至系統執行區
$ sudo cp ~/go/bin/nginx_vts_exporter /usr/local/bin

# 新增程式使用者
$ sudo useradd --no-create-home --shell /bin/false nginx_vts_exporter

# 新增系統服務
$ sudo nano /etc/systemd/system/nginx_vts_exporter.service
# 新增以下內容，-nginx.scrape_uri依照Nginx vts的網址
[Unit]
Description=Nginx vts exporter  
Wants=network-online.target
After=network-online.target
[Service]
User=nginx_vts_exporter
Group=nginx_vts_exporter
ExecStart=/usr/local/bin/nginx_vts_exporter -nginx.scrape_uri=http://localhost:9999/format/json
Restart=always
RestartSec=3
[Install]
WantedBy=default.target

#完成後，儲存離開

# 系統重新讀取服務
$ sudo systemctl daemon-reload

# 設定開機自動執行
$ sudo systemctl enable nginx_vts_exporter

# 啟動nginx_vts_exporter
$ sudo systemctl start nginx_vts_exporter

# 查詢執行狀況
$ sudo systemctl status nginx_vts_exporter

完成後即可以到http://localhost:9913/metric，觀看exporter運行狀況

Reference

https://medium.com/@shevtsovav/ready-for-scraping-nginx-metrics-nginx-vts-exporter-prometheus-grafana-26c14816ae7c