Pakaging Temporal app as a docker image

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1

Hello ,
i am new to temporal and trying to understand it by running some examples.
i decided to take things further by packaging a temporal app as a docker image. i have a temporal server running on the host which i setup using docker compose from temporal github and the server works fine. i can access it on port 8088. the problem begins when i try to build my image, to enable communication with my server i use sudo docker build --network=host -t name .
below is my Dockerfile

> FROM golang:alpine
> ENV GO111MODULE=on \
>  CGO_ENABLED=0 \
>  GOOS=linux \
>  GOARCH=amd64
> # Set the Current Working Directory inside the container
> WORKDIR /app
> COPY go.mod ./
> COPY go.sum ./
> # Download all dependencies. Dependencies will be cached if the go.mod and go.sum files are not changed
> RUN go mod download
> RUN go mod tidy
> # Copy the source from the current directory to the Working Directory inside the container
> COPY . ./
> #RUN go run ./worker/main.go
> RUN go run ./starter/main.go

When the build gets to the last line which is RUN go run ./starter/main.go it freezes there and i have to restart my server.
Please any help will be appreciated.

2

Hard to tell as don’t know what your starter code does.
By default when you start a new client like client.NewClient(client.Options{})
it has the HostPort flag set to connect to the frontend service at “localhost:7233”. If your deployed frontend service is exposed on a different host/port you need to set that in your code, for example:

c, err := client.NewClient(client.Options{
		HostPort: "...",
})

note the value is passed directly to gRPC so should have following formats: GRPC Core: gRPC Name Resolution

hope this helps

3

Hello @tihomir thanks for the response. i am not connecting on a different port.

my starter code below, it prints a message

package main

import (
"context"
"log"

"github.com/wafi/hello-workflow/helloworkflow"
"go.temporal.io/sdk/client"
)

func main() {
c, err := client.NewClient(client.Options{})
if err != nil {
log.Fatalln("Unable to make client", err)
}

defer c.Close()

workflowOptions := client.StartWorkflowOptions{
TaskQueue: "hello-world",
}

we, err := c.ExecuteWorkflow(context.Background(), workflowOptions, helloworkflow.Workflow, "victor")
if err != nil {
log.Fatalln("Unable to execute workflow", err)
}

var result string
// store the result of the run
err = we.Get(context.Background(), &result)
if err != nil {
log.Fatalln("Unable to get workflow result", err)
}
log.Println("workflow result:", result)
}

i wonder if i am building the image wrong

4

Not a docker expert, seems tho that you are missing the compile part in your docker file, for example:

RUN go build -o /my-app-name

This might help - Build your Go image | Docker Documentation

5

@tihomir thanks i have resolved the build issue, sorry for taking so long to post here

here’s the my dockerfile below

# syntax=docker/dockerfile:1
FROM golang:1.16-alpine
WORKDIR /app/
COPY . .

RUN go build -o ./main
CMD ["./main" ]