Why nginx-based docker image refuses connection in VSCode devcontainer - docker

Question

Consider following setup:
devcontainer.json
{
"name": "Deputy devcontainer",
"dockerComposeFile": "docker-compose.yml",
"service": "go-development",
"settings": {
"go.toolsManagement.checkForUpdates": "local",
"go.useLanguageServer": true,
"go.gopath": "/go"
},
"extensions": [
"golang.Go",
"gitlab.gitlab-workflow",
"GitHub.copilot",
"eamodio.gitlens",
"zxh404.vscode-proto3",
"bungcip.better-toml"
],
"workspaceFolder": "/workspace",
"remoteUser": "vscode"
}
docker-compose.yml
version: '3'
services:
go-development:
image: my-custom-docker-repository/go-development:latest
command: /bin/sh -c "while sleep 1000; do :; done"
volumes:
- ..:/workspace:cached
- ./deputy-cli-configuration.toml:/home/vscode/.deputy/configuration.toml
user: vscode
deputy-package-server:
image: my-custom-docker-repository/deputy-package-server:latest
ports:
- "8080:8080"
volumes:
- ./deputy-packages:/var/opt/deputy/deputy-package-server/package
- ./deputy-repository:/var/opt/deputy/deputy-package-server/repository
environment:
- RUST_LOG=debug
index-repository:
image: my-custom-docker-repository/deputy-repository-server
volumes:
- ./deputy-repository/.git:/srv/git/index.git
ports:
- "8082:80"
Dockerfile for index-repository:
FROM teamfruit/nginx-fcgiwrap
RUN apt-get update && apt-get upgrade -y
RUN apt-get install git-core fcgiwrap -y
COPY nginx.conf /etc/nginx/conf.d/default.conf
nginx.conf in index-repository:
server {
listen 80;
location ~ /git(/.*) {
client_max_body_size 0;
fastcgi_param SCRIPT_FILENAME /usr/lib/git-core/git-http-backend;
include fastcgi_params;
fastcgi_param GIT_HTTP_EXPORT_ALL "";
fastcgi_param GIT_PROJECT_ROOT /srv/git;
fastcgi_param PATH_INFO $1;
fastcgi_pass unix:/var/run/fcgiwrap.socket;
}
}
Dockerfile for go-development:
FROM vscode/devcontainers/go
RUN apt-get update && apt-get upgrade -y
RUN apt-get install protobuf-compiler make debhelper dpkg-dev -y
RUN go install google.golang.org/grpc/cmd/protoc-gen-go-grpc#v1.2
RUN go install google.golang.org/protobuf/cmd/protoc-gen-go#v1.28
RUN chmod 777 -R /go/pkg
When running the vscode-devcontainer, it is impossible to git clone http://index-repository/git/index.git, this fails with connection refused.
However, when I try to clone either directly in the index-repository or host machine, the commands succeeds. Also connecting to deputy-package-server (a simple Rust web-server) works without any issues.
I can also see from the tcpdump that the request actually reaches the nginx-container:
I also used dig to verify that dns is not a problem.
As of right now I am really puzzled as to why the connection keeps getting refused. I am suspecting that the issue may lie somewhere in the nginx configuration, but cannot tell where. What am I doing wrong?

Answer 1

You are mapping the port "8082:80", so you should access the index-repository container by http://localhost:8082 isntead of http://index-repository:8082.
If you want to access the repositroy server container by the domain name index-repository, you should expose the port 80 of the repositroy server container (the hostname would be defaulted in the docker network as same as the service id, eg. index-repository).
Then your dev container can access it as http://index-repository:80