added prometheus blackbox

Author: asim3

data/prometheus/targets.md

@@ -1,12 +1,51 @@
 [demo targets](https://demo.promlabs.com/targets)
 
 
+## Config
+`nano ./config/prometheus.yml`
+```yaml
+global:
+  scrape_interval: 5s # Default is every 1 minute.
+
+scrape_configs:
+  - job_name: "my-target_job"
+    metrics_path: /metrics
+    scheme: http
+    static_configs:
+      - targets:
+        - localhost:9090
+
+  # blackbox
+  - job_name: 'blackbox'
+    metrics_path: /probe
+    params:
+      module:
+        - my_http_2xx_example
+    static_configs:
+      - targets:
+        - http://prometheus.io
+        - https://prometheus.io
+        - http://example.com:8080
+        - http://asim3.github.io
+        - https://asim3.github.io
+        - http://asim3.github.io/notes
+        - https://asim3.github.io/notes
+    relabel_configs:
+      - source_labels: [__address__]
+        target_label: __param_target
+      - source_labels: [__param_target]
+        target_label: instance
+      - target_label: __address__
+        replacement: 192.168.197.131:9200
+```
+
+
 ## Node Exporter
 [download](https://github.com/prometheus/node_exporter/releases)
 ```bash
 cd /tmp
-curl -Lo node_exporter.linux-amd64.tar.gz https://github.com/prometheus/node_exporter/releases/download/v1.6.1/node_exporter-1.6.1.linux-amd64.tar.gz
-tar xvfz node_exporter.linux-amd64.tar.gz
+curl -Lo node_exporter.tar.gz https://github.com/prometheus/node_exporter/releases/download/v1.6.1/node_exporter-1.6.1.linux-amd64.tar.gz
+tar xvfz node_exporter.tar.gz
 
 /tmp/node_exporter-1.6.1.linux-amd64/node_exporter --help
 
@@ -15,9 +54,31 @@ tar xvfz node_exporter.linux-amd64.tar.gz
 ```
 
 
+## website monitoring
+[download](https://github.com/prometheus/blackbox_exporter/releases)
+```bash
+cd /tmp
+curl -Lo blackbox_exporter.tar.gz https://github.com/prometheus/blackbox_exporter/releases/download/v0.24.0/blackbox_exporter-0.24.0.linux-amd64.tar.gz
+tar xvfz blackbox_exporter.tar.gz
 
+/tmp/blackbox_exporter-0.24.0.linux-amd64/blackbox_exporter --help
 
+# run Node Exporter
+/tmp/blackbox_exporter-0.24.0.linux-amd64/blackbox_exporter --config.file="/tmp/my_blackbox_conf.yml" --web.listen-address=:9200
+```
 
+## blackbox config
+`nano /tmp/my_blackbox_conf.yml`
+```yml
+modules:
+  my_http_2xx_example:
+    prober: http
+    timeout: 5s
+    http:
+      valid_http_versions: ["HTTP/1.1", "HTTP/2.0"]
+      valid_status_codes: []
+      method: GET
+```