我有一个使用golang构建的Web服务器。
I have a web server built using golang. It works successfully when I test it locally.
但是,当我为Web服务器构建docker映像时,它无法连接到正在运行的Postgres容器。
However, when I build a docker image for my web server, it can't connect to a running Postgres container.
这是我的 docker-compose.yml :
version: '2' services: go: image: golang:1.7 volumes: - ./:/server/http ports: - "80:8080" links: - postgres - mongodb - redis environment: DEBUG: 'true' PORT: '8080' postgres: image: onjin/alpine-postgres:9.5 restart: unless-stopped ports: - "5432:5432" environment: LC_ALL: C.UTF-8 POSTGRES_USER: user POSTGRES_PASSWORD: pass POSTGRES_DB: mydb mongodb: image: mvertes/alpine-mongo:3.2.3 restart: unless-stopped ports: - "27017:27017" redis: image: sickp/alpine-redis:3.2.2 restart: unless-stopped ports: - "6379:6379"我的 Dockerfile :
FROM golang:1.7 RUN mkdir -p /home/app WORKDIR /home/app COPY . /home/app RUN make deps && make ENTRYPOINT ["./bin/api-test"] EXPOSE 8080我正在使用的Postgres连接字符串:
The Postgres connection string I am using:
postgresql://user:pass@host/mydb?sslmode=disable对于主机,我尝试使用 localhost 并返回以下错误:
For host, I tried localhost and it returns the following error:
dial tcp [::1]:5432: getsockopt: connection refused尝试 postgres 并返回以下内容:
Tried postgres and it returns the following:
dial tcp 202.71.99.194:5432: getsockopt: connection refused尝试运行此命令的IP地址,该命令返回 172.19.0.3 :
Tried the IP address I get running this command which returns 172.19.0.3:
docker inspect apitest_postgres_1 | grep IPAddress其中 apitest_postgres_1 是Postgres容器名称。它还返回了此错误:
where apitest_postgres_1 is Postgres container name. It also returned this error:
dial tcp 172.19.0.3:5432: getsockopt: connection timed out你能告诉我我在这里想念的吗?我对Docker缺乏经验,这花了很长时间研究解决方案。
Can you please tell me what I am missing here? I am inexperienced with docker and this took a long time investigating for a solution.
编辑: 我使用以下命令运行golang docker该命令:
I run my golang docker using this command:
docker run --env-file ./example.env --rm -it -p 8080:8080 api-testexample.env 是文件
编辑2: 我将连接字符串更改为以下内容:
Edit 2: I changed the connection string to the following:
postgresql://user:pass@postgres:5432?sslmode=disable它将返回以下错误:
dial tcp: lookup postgres on 192.168.65.1:53: no such host我的主意是我的Mac是这里的问题。我的默认DNS是 8.8.8.8 ,这应该没问题。
I'm getting the idea that my mac is the issue here. My default DNS is 8.8.8.8 which should not be a problem.
推荐答案看起来像是拉图像而不是构建自己的图像。
Looks like you're pulling go image instead of building you're own image.
而不是 image:golang:1.7 替换为 build:。来构建并使用您的 Dockerfile 。
Instead of image: golang:1.7 replace it with build: . to build and use your Dockerfile.
另外,您可能需要传递postgres环境变量 DB_HOST , DB_USER , DB_PASS 等。您可以实现这一点,但是创建例如 docker.env 文件,然后添加 env_file 在您的go app docker-compose.yml 文件下:
Also you might need to pass postgres environment variables DB_HOST, DB_USER, DB_PASS etc. you can achieve that but creating for example docker.env file and then add env_file under your go app docker-compose.yml file:
docker.env示例:
Example docker.env :
DB_HOST=postgres DB_USER=user DB_PASS=pass DB_NAME=mydb正确的docker-compose.yml:
Corrected docker-compose.yml :
version: '2' services: app: build: . volumes: - ./:/server/http ports: - "80:8080" links: - postgres - mongodb - redis environment: DEBUG: 'true' PORT: '8080' env_file: - docker.env postgres: image: onjin/alpine-postgres:9.5 restart: unless-stopped ports: - "5432:5432" environment: LC_ALL: C.UTF-8 POSTGRES_USER: user POSTGRES_PASSWORD: pass POSTGRES_DB: mydb mongodb: image: mvertes/alpine-mongo:3.2.3 restart: unless-stopped ports: - "27017:27017" redis: image: sickp/alpine-redis:3.2.2 restart: unless-stopped ports: - "6379:6379"更多推荐
无法从Golang容器连接到Postgres Docker容器
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