[SOLVED] Traefik + Vaultwarden 502 Error

Edit: Thanks for the help, issue was solved! Had Traefik’s loadbalancer set to route to port 8081, not the internal port of 80. Whoops.

Intro

HI everyone. I’ve been busy configuring my homelab and have run into issues with Traefik and Vaultwarden running within Podman. I’ve already successfully set up Home Assistant and Homepage but for the life of me cannot get things working. I’m hoping a fresh pair of eyes would be able to spot something I missed or provide some advice. I’ve tried to provide all the information and logs relevant to the situation.

Expected Behavior:

1. Requests for *.fenndev.network are sent to my Traefik server.
2. Incoming HTTPS requests to vault.fenndev.network are forwarded to Vaultwarden
   • HTTP requests are upgraded to HTTPS
3. Vaultwarden is accessible via https://vault.fenndev.network and utilizes the wildcard certificates generated by Traefik.

Quick Facts

Overview

• I’m running Traefik and Vaultwarden in Podman, using Quadlet
• Traefik and Vaultwarden, along with all of my other services, are part of the same fenndev_default network
• Traefik is working correctly with Home assistant, Adguard Home, and Homepage, but returns a 502 Bad Gateway error with Vaultwarden
• I’ve verified that port 8081 is open on my firewall and my service is reachable at {SERVER_IP}:8081.
• 10.89.0.132 is the internal Podman IP address of the Vaultwarden container

Versions

Server: AlmaLinux 9.4

Podman: 4.9.4-rhel

Traefik: v3

Vaultwarden: alpine-latest (1.30.5-alpine I believe)

Error Logs

Traefik Log:

<span style="color:#323232;">2024-05-11T22:09:53Z DBG github.com/traefik/traefik/v3/pkg/server/service/proxy.go:100 > 502 Bad Gateway error="dial tcp 10.89.0.132:8081: connect: connection refused"
</span>

cURL to URL:

<span style="color:#323232;">[fenndev@bastion ~]$ curl -v https://vault.fenndev.network
</span><span style="color:#323232;">*   Trying 192.168.1.169:443...
</span><span style="color:#323232;">* Connected to vault.fenndev.network (192.168.1.169) port 443 (#0)
</span><span style="color:#323232;">* ALPN, offering h2
</span><span style="color:#323232;">* ALPN, offering http/1.1
</span><span style="color:#323232;">*  CAfile: /etc/pki/tls/certs/ca-bundle.crt
</span><span style="color:#323232;">* TLSv1.0 (OUT), TLS header, Certificate Status (22):
</span>

Config Files

vaultwarden.container file:

<span style="color:#323232;">[Unit]
</span><span style="color:#323232;">Description=Password 
</span><span style="color:#323232;">After=network-online.target
</span><span style="color:#323232;">[Service]
</span><span style="color:#323232;">Restart=always
</span><span style="color:#323232;">RestartSec=3
</span><span style="color:#323232;">
</span><span style="color:#323232;">[Install]
</span><span style="color:#323232;"># Start by default on boot
</span><span style="color:#323232;">WantedBy=multi-user.target default.target
</span><span style="color:#323232;">
</span><span style="color:#323232;">[Container]
</span><span style="color:#323232;">Image=ghcr.io/dani-garcia/vaultwarden:latest-alpine
</span><span style="color:#323232;">Exec=/start.sh
</span><span style="color:#323232;">EnvironmentFile=%h/.config/vault/vault.env
</span><span style="color:#323232;">ContainerName=vault
</span><span style="color:#323232;">Network=fenndev_default
</span><span style="color:#323232;">
</span><span style="color:#323232;"># Security Options
</span><span style="color:#323232;">SecurityLabelType=container_runtime_t
</span><span style="color:#323232;">NoNewPrivileges=true                                    
</span><span style="color:#323232;"># Volumes
</span><span style="color:#323232;">Volume=%h/.config/vault/data:/data:Z
</span><span style="color:#323232;">
</span><span style="color:#323232;"># Ports
</span><span style="color:#323232;">PublishPort=8081:80
</span><span style="color:#323232;">
</span><span style="color:#323232;"># Labels
</span><span style="color:#323232;">Label=traefik.enable=true
</span><span style="color:#323232;">Label=traefik.http.routers.vault.entrypoints=web
</span><span style="color:#323232;">Label=traefik.http.routers.vault-websecure.entrypoints=websecure
</span><span style="color:#323232;">Label=traefik.http.routers.vault.rule=Host(`vault.fenndev.network`)
</span><span style="color:#323232;">Label=traefik.http.routers.vault-websecure.rule=Host(`vault.fenndev.network`)
</span><span style="color:#323232;">Label=traefik.http.routers.vault-websecure.tls=true
</span><span style="color:#323232;">Label=traefik.http.routers.vault.service=vault
</span><span style="color:#323232;">Label=traefik.http.routers.vault-websecure.service=vault
</span><span style="color:#323232;">
</span><span style="color:#323232;">Label=traefik.http.services.vault.loadbalancer.server.port=8081
</span><span style="color:#323232;">
</span><span style="color:#323232;">Label=homepage.group="Services"
</span><span style="color:#323232;">Label=homepage.name="Vaultwarden"
</span><span style="color:#323232;">Label=homepage.icon=vaultwarden.svg
</span><span style="color:#323232;">Label=homepage.description="Password Manager"
</span><span style="color:#323232;">Label=homepage.href=https://vault.fenndev.network
</span>

vault.env file:

<span style="color:#323232;">LOG_LEVEL=debug
</span><span style="color:#323232;">DOMAIN=https://vault.fenndev.network 
</span>