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Add support for CORS in HAProxy stats dashboard

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- Introduced `HAPROXY_STATS_CORS_ORIGIN` environment variable for enabling CORS in HAProxy stats.
- Updated HAProxy configuration template to handle CORS preflight and response headers.
- Added tests for static configuration mode with CORS enabled.
- Updated documentation to include new CORS configuration details and examples.
This commit is contained in:
Joao Gilberto Magalhaes 2026-02-16 20:41:49 -05:00
parent 353fd392f6
commit 491f4a8c09
8 changed files with 203 additions and 23 deletions
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docs/environment-variable.md
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@ -4,21 +4,22 @@ sidebar_position: 12
# Docker environment variables
| Environment Variable | Description | Default |
|--------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------|
| EASYHAPROXY_DISCOVER | How the services will be discovered to create `haproxy.cfg`: `static`, `docker`, `swarm` or `kubernetes` | **required** |
| EASYHAPROXY_LABEL_PREFIX | (Optional) The key will search for matching resources. | `easyhaproxy` |
| EASYHAPROXY_BASE_PATH | (Optional) Base directory for all EasyHAProxy files. All paths (config, certs, plugins, www) are constructed relative to this base. | `/etc/easyhaproxy` |
| EASYHAPROXY_CERTBOT_* | (Optional) Enable Let's Encrypt or any other ACME certificate. See more: [acme](acme.md) | *empty* |
| EASYHAPROXY_SSL_MODE | (Optional) `strict` supports only the most recent TLS version; `default` good SSL integration with recent browsers; `loose` supports all old SSL protocols for old browsers (not recommended). | `default` |
| EASYHAPROXY_REFRESH_CONF | (Optional) Check for new containers/services every N seconds. | 10 |
| EASYHAPROXY_LOG_LEVEL | (Optional) The log level for EasyHAproxy messages. Available: TRACE,DEBUG,INFO,WARN,ERROR,FATAL | DEBUG |
| CERTBOT_LOG_LEVEL | (Optional) The log level for Certbot messages. Available: TRACE,DEBUG,INFO,WARN,ERROR,FATAL | DEBUG |
| HAPROXY_LOG_LEVEL | (Optional) The log level for HAProxy messages. Available: TRACE,DEBUG,INFO,WARN,ERROR,FATAL | INFO |
| HAPROXY_USERNAME | (Optional) The HAProxy username for the statistics endpoint (used only when `HAPROXY_PASSWORD` is set). | `admin` |
| HAPROXY_PASSWORD | (Optional) The HAProxy password to the statistics endpoint. Stats are **disabled** unless this is defined. | *empty* |
| HAPROXY_STATS_PORT | (Optional) The HAProxy port to the statistics. If set to `false`, disable statistics. Only applies when `HAPROXY_PASSWORD` is defined. | `1936` |
| HAPROXY_CUSTOMERRORS | (Optional) If HAProxy will use custom HTML errors. true/false. | `false` |
| Environment Variable | Description | Default |
|---------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------|
| EASYHAPROXY_DISCOVER | How the services will be discovered to create `haproxy.cfg`: `static`, `docker`, `swarm` or `kubernetes` | **required** |
| EASYHAPROXY_LABEL_PREFIX | (Optional) The key will search for matching resources. | `easyhaproxy` |
| EASYHAPROXY_BASE_PATH | (Optional) Base directory for all EasyHAProxy files. All paths (config, certs, plugins, www) are constructed relative to this base. | `/etc/easyhaproxy` |
| EASYHAPROXY_CERTBOT_* | (Optional) Enable Let's Encrypt or any other ACME certificate. See more: [acme](acme.md) | *empty* |
| EASYHAPROXY_SSL_MODE | (Optional) `strict` supports only the most recent TLS version; `default` good SSL integration with recent browsers; `loose` supports all old SSL protocols for old browsers (not recommended). | `default` |
| EASYHAPROXY_REFRESH_CONF | (Optional) Check for new containers/services every N seconds. | 10 |
| EASYHAPROXY_LOG_LEVEL | (Optional) The log level for EasyHAproxy messages. Available: TRACE,DEBUG,INFO,WARN,ERROR,FATAL | DEBUG |
| CERTBOT_LOG_LEVEL | (Optional) The log level for Certbot messages. Available: TRACE,DEBUG,INFO,WARN,ERROR,FATAL | DEBUG |
| HAPROXY_LOG_LEVEL | (Optional) The log level for HAProxy messages. Available: TRACE,DEBUG,INFO,WARN,ERROR,FATAL | INFO |
| HAPROXY_USERNAME | (Optional) The HAProxy username for the statistics endpoint (used only when `HAPROXY_PASSWORD` is set). | `admin` |
| HAPROXY_PASSWORD | (Optional) The HAProxy password to the statistics endpoint. Stats are **disabled** unless this is defined. | *empty* |
| HAPROXY_STATS_PORT | (Optional) The HAProxy port to the statistics. If set to `false`, disable statistics. Only applies when `HAPROXY_PASSWORD` is defined. | `1936` |
| HAPROXY_STATS_CORS_ORIGIN | (Optional) Enable CORS for the HAProxy stats dashboard by specifying the allowed origin (e.g., `http://localhost:3000`). Only applies when `HAPROXY_PASSWORD` is defined. | *empty* |
| HAPROXY_CUSTOMERRORS | (Optional) If HAProxy will use custom HTML errors. true/false. | `false` |
:::tip HAProxy Stats
Statistics are only configured when `HAPROXY_PASSWORD` is set. Without a password, the stats section is not generated.