使用 golang (github.com/cosmtrek/air) 在 docker 中热重载不起作用

Question

I've tried everything and nothing has solved my hot reload problem, the containers will load normally and the code will be built, however, after modifying the code, the code will change, but the air package won't do any rebuilds.

This state does not change if edit some code.

if run locally everything works fine.

Dockerfile:

FROM golang:alpine
ENV GO111MODULE=on

EXPOSE 8080

RUN mkdir /app
WORKDIR /app

COPY go.mod .
COPY go.sum .

RUN go mod download
RUN go get github.com/cosmtrek/air

COPY . .

ENTRYPOINT ["air", "-c", ".air.toml"]

docker-compose.yml

   go:
    container_name: go
    build:
      dockerfile: Dockerfile
      context: ./
    volumes:
      - ./:/app
    ports:
      - '8080:8080'

.air.toml

root = "."
testdata_dir = "testdata"
tmp_dir = "tmp"

[build]
  bin = "./tmp/main"
  cmd = "go build -o ./tmp/main ."
  delay = 1000
  exclude_dir = ["assets", "tmp", "vendor", "testdata"]
  exclude_file = []
  exclude_regex = ["_test.go"]
  exclude_unchanged = false
  follow_symlink = false
  full_bin = ""
  include_dir = []
  include_ext = ["go", "tpl", "tmpl", "html"]
  kill_delay = "0s"
  log = "build-errors.log"
  send_interrupt = false
  stop_on_error = true

[color]
  app = ""
  build = "yellow"
  main = "magenta"
  runner = "green"
  watcher = "cyan"

[log]
  time = false

[misc]
  clean_on_exit = false

[screen]
  clear_on_rebuild = false

Answer 1

Simply rebuild container by command docker-compose up -d --build

Answer 2

The problem will be solved when you open your folders in visual studio using wsl

enter image description here

may be helpful: https://code.visualstudio.com/docs/remote/wsl

Answer 3

I see this is an old question but I ran into this problem recently and finally managed to solve it. So I leave my answer here in case it helps other users.

As I have read in some comments, the problem is indeed due to the fact that Air uses event notification (fsnotify) and this does not propagate correctly between the windows system and the docker containers . However, this does work correctly on linux, for this reason the only solution we can currently choose is the following:

Install WSL2 on Windows

WSL2 allows us to install a Linux distribution within our Windows system in order to use its tools, utilities and file system. Thanks to this, we will be able to solve the problem of event propagation by moving our copy of the repository to the linux file system and working on it, but all within the windows operating system.

The steps to follow to achieve this are:

1. Install the Ubuntu distribution from the command line
   wsl --install -d Ubuntu

2. Set ubuntu as the current distribution for WSL2

   wsl --set-version Ubuntu 2

3. Apply WSL integration in docker

   3.1 Go to docker desktop -> settings -> resources -> WSL Integration -> Refresh

   3.2 Activate Ubuntu

   3.3 Apply changes

4. Access the ubuntu filesystem from windows explorer \\wsl$\Ubuntu\ and move the repository copy to it.

5. Install the extension for vscode Remote - WSL

6. Open the working directory in vscode from the new location via remote wsl using:

   ctrl+shift+p -> Open folder in WSL

7. Run the command:

docker-compose up

All this information has been obtained from the open issue today in the air package repository.