I'm currently evaluating the blackbox exporter.
My docker-compose.yml looks like:
```
version: "3"
services:
prometheus:
image: prom/prometheus
restart: unless-stopped
volumes:
- "$PWD/shared/prometheus/etc/prometheus.yml:/etc/prometheus/prometheus.yml"
ports:
- 9090:9090
command:
- --config.file=/etc/prometheus/prometheus.yml
blackbox:
image: prom/blackbox-exporter:master
restart: unless-stopped
volumes:
- "$PWD/shared/blackbox/config:/config"
ports:
- 9115:9115
command:
- --config.file=/config/blackbox.yml
```
The prometheus configuration looks like:
```
global:
# How frequently to scrape targets
scrape_interval: 10s
# How frequently to evaluate rules
evaluation_interval: 10s
scrape_configs:
- job_name: "blackbox"
metrics_path: /probe
params:
module: [http_2xx] # Look for a HTTP 200 response.
static_configs:
- targets:
- www.google.com
relabel_configs:
- source_labels: [__address__]
target_label: __param_target
- source_labels: [__param_target]
target_label: instance
- target_label: __address__
replacement: blackbox:9115 # The blackbox exporter's real
hostname:port.
```
The stack can be brought up correctly.
When accessing the blackbox exporter from my machine, it works as expected:
However, prometheus is unable to reach blackbox exporter: server returned
HTTP status 400 Bad Request
When I connect into the prometheus container, I can check that the port
9115 is correctly open and that blackbox is reachable:
```
$ nc -nv blackbox 9115
blackbox (172.20.0.2:9115) open
```
Connections to the blackbox main page works fine:
```
/prometheus $ wget http://blackbox:9115
Connecting to blackbox:9115 (172.20.0.2:9115)
saving to 'index.html'
index.html 100%
|************************************************| 651 0:00:00 ETA
'index.html' saved
```
But connecting to the /probe fails:
```
/prometheus $ wget
http://blackbox:9115/probe?target=sti.epfl.ch&module=http_2xx_example&debug=t
rue
/prometheus $ Connecting to blackbox:9115 (172.20.0.2:9115)
wget: server returned error: HTTP/1.1 400 Bad Request
```
Did I miss something from the blackbox's configuration to make it accept
connections from prometheus?
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