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问题:
I am pretty new to GoLang. I have a pretty simple dockerFile that is trying to build a goLang webservice.
FROM golang:alpine WORKDIR /app/webservice_refArch ADD . /app/webservice_refArch RUN apk add git RUN apk upgrade RUN cd /app/webservice_refArch/ && go get webservice_refArch/restapi RUN cd /app/webservice_refArch/cmd/reference-w-s-server && go build -o ../../server ENTRYPOINT ./goapp
When the build runs it cannot find a local import.
go get webservice_refArch/restapi
The error that I get is:
package webservice_refArch/restapi: unrecognized import path "webservice_refArch/restapi" (import path does not begin with hostname)
When I run that same command on my local (in the same folder) it runs just fine. I am sure that I am missing something stupid but any thoughts on why it fails when running from docker would be appreciated.
回答1:
What is missing is to put your project under $GOPATH and if you have local namespace it should also be under the same namespace $GOPATH/domain.com/.
A proper way also to do that is to have a multi-stage builds. The basic principle involved with Multi-stage involves invoking a temporary container which can facilitate the application build, then copying the built assets out of that space into a container image that has the least amount of components required to run the app.
# builder FROM golang:1-alpine AS builder RUN apk add git ca-certificates --update ENV SERVICE_NAME my_project ENV NAMESPACE mydomain #if you don't use namespace space just ignore it and remove it from the following lines ENV APP /src/${NAMESPACE}/${SERVICE_NAME}/ ENV WORKDIR ${GOPATH}${APP} WORKDIR $WORKDIR ADD . $WORKDIR RUN go build ############################################################### #image FROM alpine RUN apk add ca-certificates --update ENV SERVICE_NAME webservice_refArch ENV NAMESPACE my_domain #if you don't use namespace space just ignore it and remove it from the following lines ENV APP /src/${NAMESPACE}/${SERVICE_NAME}/ ENV GOPATH /go ENV WORKDIR ${GOPATH}${APP} COPY --from=builder ${WORKDIR}${SERVICE_NAME} $WORKDIR CMD ${WORKDIR}${SERVICE_NAME}
回答2:
It isn't surely very nice, but if you have difficulties the first times you could copy only the executable file doing something like this:
FROM golang:alpine RUN apk upgrade COPY goapp . CMD ./goapp
It is surely better to compile code inner the image, but it isn't necessary. So you could compile locally your code, and then move only the executable, and you won't have anymore problem like that.
回答3:
It was because I wasn't copying over to my GOROOT location. As a result, when it was trying to find the local resource it wasn't in the GOROOT spot.
Changing the dockerFile to look like this worked...
FROM golang:alpine WORKDIR /go ADD . /go/src/webservice_refArch RUN apk add git RUN apk upgrade RUN cd /go/src/webservice_refArch/ && go get ./... RUN cd /go/src/webservice_refArch/cmd/reference-w-s-server && go build -o ../../server ENTRYPOINT ./goapp
