go-proxy

A simple auto docker reverse proxy for home use. Written in Go

In the examples domain x.y.z is used, replace them with your domain

Table of content

• Features
• Why am I making this
• How to use
• Configuration
  • Single Port Configuration
  • Multiple Ports Configuration
  • TCP/UDP Configuration
• Troubleshooting
• Benchmarks
• Memory usage
• Build it yourself
• Getting SSL certs

Features

• subdomain matching (domain name doesn't matter)

• path matching

• HTTP proxy

• TCP/UDP Proxy (experimental, unable to release port on hot-reload)

• Auto hot-reload when container start / die / stop.

• Simple panel to see all reverse proxies and health (visit port :81 of go-proxy https://*.y.z:81)

  

Why am I making this

1. It's fun.
2. I have tried different reverse proxy services, i.e. nginx proxy manager, traefik, nginx-proxy. I have found that traefik is not easy to use, and I don't want to click buttons every time I spin up a new container (nginx proxy manager). For nginx-proxy I found it buggy and quite unusable.

How to use

1. Clone the repo git clone https://github.com/yusing/go-proxy

2. Copy content from compose.example.yml and create your own compose.yml

3. Add networks to make sure it is in the same network with other containers, or make sure proxy.<alias>.host is reachable

4. Modify the path to your SSL certs. See Getting SSL Certs

5. Start go-proxy with docker compose up -d.

6. (Optional) If you are using ufw with vpn that drop all inbound traffic except vpn, run below to allow docker containers to connect to go-proxy

   In case the network of your container is in subnet 172.16.0.0/12 (bridge), and vpn network is under 100.64.0.0/10 (i.e. tailscale)

   sudo ufw allow from 172.16.0.0/12 to 100.64.0.0/10

   You can also list CIDRs of all docker bridge networks by:

   docker network inspect $(docker network ls | awk '$3 == "bridge" { print $1}') | jq -r '.[] | .Name + " " + .IPAM.Config[0].Subnet' -

7. start your docker app, and visit <container_name>.y.z

Configuration

With container name, no label needs to be added.

However, there are some labels you can manipulate with:

• proxy.aliases: comma separated aliases for subdomain matching
  • defaults to container_name
• proxy.<alias>.scheme: container port protocol (http or https)
  • defaults to http
• proxy.<alias>.host: proxy host
  • defaults to container_name
• proxy.<alias>.port: proxy port
  • http/https: defaults to first expose port (declared in Dockerfile or docker-compose.yml)
  • tcp/udp: is in format of [<listeningPort>:]<targetPort>
    • when listeningPort is omitted (not suggested), a free port will be used automatically.
    • targetPort must be a number, or the predefined names (see stream.go)
• proxy.<alias>.path: path matching (for http proxy only)
  • defaults to empty

Single port configuration example

# (default) https://<container_name>.y.z
whoami:
  image: traefik/whoami
  container_name: whoami # => whoami.y.z

# enable both subdomain and path matching:
whoami:
  image: traefik/whoami
  container_name: whoami
  labels:
    - proxy.aliases=whoami,apps
    - proxy.apps.path=/whoami
# 1. visit https://whoami.y.z
# 2. visit https://apps.y.z/whoami

Multiple ports configuration example

minio:
  image: quay.io/minio/minio
  container_name: minio
  ...
  labels:
    proxy.aliases: minio,minio-console
    proxy.minio.port: 9000
    proxy.minio-console.port: 9001

# visit https://minio.y.z to access minio
# visit https://minio-console.y.z/whoami to access minio console

TCP/UDP configuration example

# In the app
app-db:
  image: postgres:15
  container_name: app-db
  ...
  labels:
    # Optional (postgres is in the known image map)
    - proxy.app-db.scheme=tcp

    # Optional (first free port will be used for listening port)
    - proxy.app-db.port=20000:postgres  

# In go-proxy
go-proxy:
  ...
  ports:
    - 80:80
    ...
    - 20000:20000/tcp
    # or 20000-20010:20000-20010/tcp to declare large range at once

# access app-db via <*>.y.z:20000

Troubleshooting

Q: How to fix when it shows "no matching route for subdomain <subdomain>"?

A: Make sure the container is running, and <subdomain> matches any container name / alias

Benchmarks

Benchmarked with wrk connecting traefik/whoami's /bench endpoint

Direct connection

% wrk -t20 -c100 -d10s --latency http://homelab:4999/bench
Running 10s test @ http://homelab:4999/bench
  20 threads and 100 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     3.74ms    1.19ms  19.94ms   81.53%
    Req/Sec     1.35k   103.96     1.60k    73.60%
  Latency Distribution
     50%    3.46ms
     75%    4.16ms
     90%    4.98ms
     99%    8.04ms
  269696 requests in 10.01s, 32.41MB read
Requests/sec:  26950.35
Transfer/sec:      3.24MB

With go-proxy reverse proxy

% wrk -t20 -c100 -d10s --latency https://whoami.mydomain.com/bench
Running 10s test @ https://whoami.6uo.me/bench
  20 threads and 100 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     4.02ms    2.13ms  47.49ms   95.14%
    Req/Sec     1.28k   139.15     1.47k    91.67%
  Latency Distribution
     50%    3.60ms
     75%    4.36ms
     90%    5.29ms
     99%    8.83ms
  253874 requests in 10.02s, 24.70MB read
Requests/sec:  25342.46
Transfer/sec:      2.47MB

Memory usage

It takes ~ 0.1-0.4MB for each HTTP Proxy, and <2MB for each TCP/UDP Proxy

Build it yourself

1. Install go if not already

2. get dependencies with sh scripts/get.sh

3. build binary with sh scripts/build.sh

4. start your container with docker compose up -d

Getting SSL certs

I personally use nginx-proxy-manager to get SSL certs with auto renewal by Cloudflare DNS challenge. You may symlink the certs from nginx-proxy-manager to somewhere else, and mount them to go-proxy's /certs