通过docker连接golang和redis

Question

我正在尝试使用 docker-compose 通过 Docker 连接 golang 和 reds，但我运气不佳。我已经在 https://github.com/davidwilde/docker-compose-golang-redis/tree/Whosebug_question 发布了我的尝试并在下面列出了日志。

Redis 说它已准备好接受连接，但我使用 gopkg.in/redis.v3 的 golang 应用程序说不。

 ~/workspace/composetest   master ●  docker-compose up
Starting composetest_db_1...
Starting composetest_web_1...
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ur kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.
db_1  | 1:M 20 Nov 05:58:33.371 * DB loaded from disk: 0.000 seconds
db_1  | 1:M 20 Nov 05:58:33.371 * The server is now ready to accept connections on port 6379
web_1 | panic: dial tcp [::1]:6379: getsockopt: connection refused
web_1 |
web_1 | goroutine 1 [running]:
web_1 | main.main()
web_1 |     /go/src/app/app.go:19 +0x131
web_1 |
web_1 | goroutine 17 [syscall, locked to thread]:
web_1 | runtime.goexit()
web_1 |     /usr/local/go/src/runtime/asm_amd64.s:1696 +0x1
web_1 | panic: dial tcp [::1]:6379: getsockopt: connection refused
web_1 |
web_1 | goroutine 1 [running]:
web_1 | main.main()
web_1 |     /go/src/app/app.go:19 +0x131
web_1 |
web_1 | goroutine 17 [syscall, locked to thread]:
web_1 | runtime.goexit()
web_1 |     /usr/local/go/src/runtime/asm_amd64.s:1696 +0x1

Answer 1

所以我们有两个不同的容器，这意味着在这种情况下有两个不同的"localhost"。

client := redis.NewClient(&redis.Options{
    Addr: "localhost:6379",
    Password: "",
    DB: 0,
})

因此，您的应用正在向它自己的沙盒容器发出请求，而不是向您的 "other" 包含 redis 的沙盒容器发出请求。

您有两个选择；

在您的撰写文件中提供映射，例如 redisdb:db 并传递该信息而不是本地主机。

或者，使用“--net=host”选项以便在不更改代码的情况下为您的容器提供通用网络。

编辑：打字错误

Answer 2

@Gladmir 的回答很棒。只是为了扩展 his/her 答案，我不需要从我的 Golang 代码中删除 localhost：

client := redis.NewClient(&redis.Options{
    Addr:     "localhost:6379",
    Password: "",
    DB:       0,
})

我更改了 Docker Compose 文件以使用 network_mode: "host":

version: "3.9"
services:
  web:
    build:
      context: .
    network_mode: "host"
  redis:
    container_name: "redis"
    image: "redis:alpine"
    command: redis-server /usr/local/etc/redis/redis.conf
    ports:
      - "6379:6379"
    volumes:
      - $PWD/configs/redis.conf:/usr/local/etc/redis/redis.conf

通过docker连接golang和redis

Connecting golang and redis through docker

go

redis

docker

docker-compose