Documentation Refactor
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docs/ssl.md
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docs/ssl.md
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---
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sidebar_position: 10
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---
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# Setup custom certificates
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You can use your own certificates with EasyHAProxy instead of (or in addition to) automatic ACME/Certbot certificates.
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:::info How SSL Termination Works
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SSL termination happens at the **HAProxy level**, NOT in your backend containers.
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- Your backend containers should **only** expose HTTP (port 80), not HTTPS
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- HAProxy handles all SSL/TLS encryption and decryption
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- Backend containers receive plain HTTP traffic from HAProxy
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- Do NOT configure SSL in your backend application when using EasyHAProxy
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This is the **correct design** - it centralizes SSL management at the proxy layer.
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:::
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:::info Certificate Types
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EasyHAProxy supports two certificate sources:
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- **ACME/Certbot automatic certificates** - Issued automatically via Let's Encrypt or other ACME providers (see [ACME documentation](./acme.md))
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- **Manual/custom certificates** - Your own certificates loaded via volume mount (recommended) or labels (this page)
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Both can be used simultaneously. Per domain, ACME certificates (if `certbot=true` label is set) take precedence over manual certificates.
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:::
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There are two ways to provide custom certificates:
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- [Map the certificate as a docker volume](#map-the-certificate-as-a-docker-volume)
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- [Setup certificate as a label definition](#setup-certificate-as-a-label-definition-in-docker-container)
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## Map the certificate as a docker volume
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EasyHAProxy stores the certificates inside the container folder `/etc/easyhaproxy/certs/haproxy`.
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1. Run EasyHAProxy with the volume for the certificates:
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```bash title="Create and mount certificate volume"
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docker volume create certs_haproxy
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docker run \
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/* other parameters */
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-v certs_haproxy:/etc/easyhaproxy/certs/haproxy \
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-d byjg/easy-haproxy
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```
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2. Create a single PEM from the certificate and the key.
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```bash title="Combine certificate and key"
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cat example.com.crt example.com.key > single.pem
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cat single.pem
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-----BEGIN CERTIFICATE-----
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MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQC5ZheHqmBnEJP+
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U9r1gxYWKLzdqrMrcxtQN6M1hIH9n0peuJeIrybdcV7sMbStMXI=
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-----END CERTIFICATE-----
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-----BEGIN PRIVATE KEY-----
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MIIEojCCA4qgAwIBAgIUegW2BimwuL4RzRZ2WYkHA6U5nkAwDQYJKoZIhvcNAQEL
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3j4wz8/I5fdsk090j4s5KA==
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-----END PRIVATE KEY-----
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```
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3. Copy this certificate to EasyHAProxy volume:
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```bash title="Copy certificate to container"
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# IMPORTANT: Filename must match the domain!
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docker cp single.pem easyhaproxy:/etc/easyhaproxy/certs/haproxy/example.com.pem
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```
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:::warning Important Notes
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- The filename **must match the domain name**: `example.com.pem` for domain `example.com`
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- When using volume-mounted certificates, **do NOT** use the `easyhaproxy.[definition].sslcert` label
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- The volume mount method and the label method are **mutually exclusive** per domain
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- SSL termination happens at HAProxy - your backend containers should only serve HTTP
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:::
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4. Configure your backend container (no sslcert label needed):
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```yaml
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services:
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easyhaproxy:
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image: byjg/easy-haproxy:6.0.0
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volumes:
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- /var/run/docker.sock:/var/run/docker.sock
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- certs_haproxy:/etc/easyhaproxy/certs/haproxy
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ports:
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- "80:80"
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- "443:443"
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myapp:
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image: nginx
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labels:
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easyhaproxy.web.host: example.com
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easyhaproxy.web.port: 80 # Frontend port (HAProxy listens here)
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easyhaproxy.web.localport: 80 # Backend port (your container)
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# NO sslcert label when using volume method!
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volumes:
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certs_haproxy:
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```
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## Setup certificate as a label definition in docker container
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:::info Alternative Method
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This method embeds certificates directly in container labels. Use it when you want certificates in version control or don't want to manage external files. **Volume method is recommended for most use cases.**
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:::
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1. Create a single PEM from the certificate and key:
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```bash title="Combine certificate and key"
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cat example.com.crt example.com.key > single.pem
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```
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2. Convert the `single.pem` to BASE64 in a single line:
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```bash title="Convert to BASE64"
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cat single.pem | base64 -w0
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```
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3. Add the Base64 string to your container label:
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```yaml
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services:
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myapp:
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image: nginx
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labels:
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easyhaproxy.web.host: example.com
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easyhaproxy.web.port: 80
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easyhaproxy.web.localport: 80
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easyhaproxy.web.sslcert: "LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0t..." # Base64 certificate
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```
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:::warning When Using Label Method
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- **There is no necessary to** mount the `/etc/easyhaproxy/certs/haproxy` volume for this domain
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- Using `sslcert` label means the volume-mounted certificate will be **ignored**
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- Certificate is visible in `docker inspect` output (less secure)
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- Updating requires container redeployment
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:::
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----
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[Open source ByJG](http://opensource.byjg.com)
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