Golang based Solace client in Docker
Hi,
I am trying to create a docker image that would contain the golang based subscriber. The subscriber is based on https://github.com/SolaceSamples/solace-samples-go/blob/main/patterns/direct_subscriber.go
The DockerFile looks like the following.
FROM golang:1.18.0-alpine3.15 as builder
WORKDIR /app
#bring the go project dependencies
RUN apk add --update --no-cache ca-certificates git
RUN apk add build-base
# Copy the local package files to the container's workspace.
COPY patterns/direct_subscriber.go ./direct_subscriber.go
COPY go.mod go.sum ./
RUN go mod download
RUN ls /app
# RUN go build -o main .
#build the go project
WORKDIR /app
RUN CGO_ENABLED=0 GOOS=linux go build -o main .
#main image
# FROM scratch
FROM alpine:3.15.2
ENV APP_USER app
ENV APP_HOME /app
ENV GROUP_ID 3000
ENV USER_ID 1000
RUN addgroup -g ${GROUP_ID} -S ${APP_USER} && adduser -u ${USER_ID} -S ${APP_USER} -G ${APP_USER}
RUN mkdir -p $APP_HOME
WORKDIR $APP_HOME
# Copy the output from builder image to main image
COPY --from=builder /app ./
RUN chown -R $APP_USER:$APP_USER $APP_HOME
USER $APP_USER
# Run the sync agent executable by default when the container starts.
ENTRYPOINT ["./main"]
The docker build fails with the following error.
=> ERROR [builder 10/10] RUN CGO_ENABLED=0 GOOS=linux go build -o main . 0.4s ------ > [builder 10/10] RUN CGO_ENABLED=0 GOOS=linux go build -o main .: #19 0.251 # solace.dev/go/messaging/pkg/solace/subcode #19 0.251 /go/pkg/mod/solace.dev/go/messaging@v1.0.1/pkg/solace/subcode/subcode.go:41:15: undefined: ccsmp.SolClientSubCodeToString #19 0.251 /go/pkg/mod/solace.dev/go/messaging@v1.0.1/pkg/solace/subcode/subcode.go:41:46: undefined: ccsmp.SolClientSubCode #19 0.289 # solace.dev/go/messaging/internal/impl/constants #19 0.289 /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/impl/constants/default_properties.go:35:8: undefined: ccsmp.SolClientSessionPropTopicDispatch #19 0.289 /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/impl/constants/default_properties.go:36:8: undefined: ccsmp.SolClientSessionPropSendBlocking #19 0.289 /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/impl/constants/default_properties.go:37:8: undefined: ccsmp.SolClientSessionPropReapplySubscriptions #19 0.289 /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/impl/constants/default_properties.go:38:8: undefined: ccsmp.SolClientSessionPropIgnoreDupSubscriptionError #19 0.289 /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/impl/constants/default_properties.go:39:8: undefined: ccsmp.SolClientSessionPropReconnectRetries #19 0.289 /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/impl/constants/default_properties.go:40:8: undefined: ccsmp.SolClientSessionPropGuaranteedWithWebTransport #19 0.289 /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/impl/constants/default_properties.go:41:8: undefined: ccsmp.SolClientSessionPropPubWindowSize ------ executor failed running [/bin/sh -c CGO_ENABLED=0 GOOS=linux go build -o main .]: exit code: 2
Could you please help in what could be missing ?
Best Answer
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Hi @subhoatg
Unfortunately, we don’t currently support Alpine, but support will be coming soon in the next version of the Go API! You’ll have to switch to another base image for now such as golang:buster and ubuntu:latest for your build and main images respectively.
In addition, the Solace PubSub+ Go API uses C code under the hood for performance, thus requires CGO_ENABLED=1 when building.
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Answers
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Hi @subhoatg
Unfortunately, we don’t currently support Alpine, but support will be coming soon in the next version of the Go API! You’ll have to switch to another base image for now such as golang:buster and ubuntu:latest for your build and main images respectively.
In addition, the Solace PubSub+ Go API uses C code under the hood for performance, thus requires CGO_ENABLED=1 when building.
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@amackenzie Thanks for your reply.
I tried with the below Dockerfile.
FROM golang:1.18-buster as builder WORKDIR /app RUN apt update RUN apt install build-essential -y COPY patterns/direct_subscriber.go ./direct_subscriber.go COPY go.mod go.sum ./ RUN go mod download RUN ls /app WORKDIR /app RUN CGO_ENABLED=1 GOOS=linux go build -o main . #main image FROM ubuntu:latest ENV APP_USER app ENV APP_HOME /app RUN mkdir -p $APP_HOME WORKDIR $APP_HOME # Copy the output from builder image to main image COPY --from=builder /app ./ RUN chown -R $APP_USER:$APP_USER $APP_HOME USER $APP_USER # Run the sync agent executable by default when the container starts. ENTRYPOINT ["./main"]
But now I am getting a different error.
=> ERROR [builder 10/10] RUN CGO_ENABLED=1 go build -o main . 2.3s ------ > [builder 10/10] RUN CGO_ENABLED=1 go build -o main .: #18 2.250 # solace.dev/go/messaging/internal/ccsmp #18 2.250 /usr/bin/ld: /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/ccsmp/lib/linux/libsolclient.a(solClient.o): Relocations in generic ELF (EM: 62) #18 2.250 /usr/bin/ld: /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/ccsmp/lib/linux/libsolclient.a(solClient.o): Relocations in generic ELF (EM: 62) #18 2.250 /usr/bin/ld: /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/ccsmp/lib/linux/libsolclient.a(solClient.o): Relocations in generic ELF (EM: 62) #18 2.250 /usr/bin/ld: /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/ccsmp/lib/linux/libsolclient.a(solClient.o): Relocations in generic ELF (EM: 62) #18 2.250 /usr/bin/ld: /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/ccsmp/lib/linux/libsolclient.a(solClient.o): Relocations in generic ELF (EM: 62) #18 2.250 /usr/bin/ld: /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/ccsmp/lib/linux/libsolclient.a(solClient.o): Relocations in generic ELF (EM: 62) #18 2.250 /usr/bin/ld: /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/ccsmp/lib/linux/libsolclient.a(solClient.o): Relocations in generic ELF (EM: 62) #18 2.250 /usr/bin/ld: /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/ccsmp/lib/linux/libsolclient.a(solClient.o): Relocations in generic ELF (EM: 62) #18 2.250 /usr/bin/ld: /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/ccsmp/lib/linux/libsolclient.a(solClient.o): Relocations in generic ELF (EM: 62) #18 2.250 /usr/bin/ld: /go/pkg/mod/solace.dev/go/messaging@v1.0.1/internal/ccsmp/lib/linux/libsolclient.a: error adding symbols: file in wrong format #18 2.250 collect2: error: ld returned 1 exit status ------ executor failed running [/bin/sh -c CGO_ENABLED=1 go build -o main .]: exit code: 2
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That seems like it could do with not supporting M1 Apple chips... yet. Again, it's coming soon, but we do not yet support M1 chips.
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@amackenzie thanks. Do you have any timeline for support of alpine images ?
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@murat are you able to comment on the Alpine and M1 timelines?
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Hello,
may I ask if we are now enabled to use Alpine with MUSL to statically link our dependencies?
I think static linking with glibc will also cause licencing issues if one plans to distribute a piece of software to customers thats using solace internally ?
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Hi @subhoatg ,
We had announced the C API support for Alpine (which is required for the Go API) and that announcement was made here: https://solace.community/discussion/1498/pubsub-messaging-api-for-c-alpine-linux-support
As for the Go API it officially supports Alpine Linux as of version 1.1.0 (with the current version being v.1.2.0)
This concludes support for Alpine, however support for Mac M series is still pending and expected on or before June 2023. Similarly to the the Alpine support, I will be making another community post once it is released for general awareness.
Thank you,
MV
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