Docker - Build an application to an image and run it

Dockerfile:

# Build stage
FROM golang:1.21.5-alpine3.18 AS builder
WORKDIR /app 
COPY . .
RUN go env -w GOPROXY=https://goproxy.io,direct
RUN go build -o main main.go

# Run stage
FROM alpine:3.18
WORKDIR /app
COPY --from=builder /app/main .
COPY app.env .

EXPOSE 8080
CMD [ "/app/main"]

 

zzh@ZZHPC:/zdata/Github/zimplebank$ docker build -t zimplebank:latest .

 

zzh@ZZHPC:/zdata/Github/zimplebank$ docker images
REPOSITORY   TAG       IMAGE ID       CREATED              SIZE
zimplebank   latest    1ab108eea809   About a minute ago   25.4MB

 

Use network to connect two standalone containers (postgres16 and zimplebank):

zzh@ZZHPC:/zdata/Github/zimplebank$ docker network create zbank-network

zzh@ZZHPC:/zdata/Github/zimplebank$ docker network connect zbank-network postgres16

 

Run the container with --network:

zzh@ZZHPC:/zdata/Github/zimplebank$ docker run --name zimplebank --network zbank-network -p 8080:8080 -e GIN_MODE=release -e DB_SOURCE="postgresql://root:aaa@postgres16:5432/zimple_bank?sslmode=disable" zimplebank:latest

 

zzh@ZZHPC:~$ docker network inspect zbank-network

......
        "Containers": {
            "5d50a55a684a6c14e1c04e6416b0c7380b2cce308a96c7fd27bbe02c47703a46": {
                "Name": "zimplebank",
                "EndpointID": "4fccd5618a1721e37d440d473677029e1ea2643c6eebce4beb469412553e8061",
                "MacAddress": "02:42:ac:12:00:03",
                "IPv4Address": "172.18.0.3/16",
                "IPv6Address": ""
            },
            "7a740db38f9844c63bb5b5b4ab8ebd8dc51b0403b669cbd55612b30cbf3b86a5": {
                "Name": "postgres16",
                "EndpointID": "c6f4c3a44bbfb98c186ef685be02e119730ad676bb9f2e2acaee026b951eb3ac",
                "MacAddress": "02:42:ac:12:00:02",
                "IPv4Address": "172.18.0.2/16",
                "IPv6Address": ""
            }
        },
......