Dockerfile: Use multiple stage builds (#23)

* suggestion: Support multiple stage builds

Signed-off-by: Ce Gao <gaoce@caicloud.io>

* docs: Add requiremnet for docker build

Signed-off-by: Ce Gao <gaoce@caicloud.io>

* manifests: Remove the args and use entrypoint

Signed-off-by: Ce Gao <gaoce@caicloud.io>

* Dockerfile: Replace shell format with exec format

Signed-off-by: Ce Gao <gaoce@caicloud.io>

docs/developer-guide.md

@@ -1,5 +1,9 @@
 # Developer Guide
 
+## Requirements
+
+- Docker (17.05 or later.)
+
 ## Build from source code
 
 You can build all images from source.

manifests/vizier/suggestion/grid/deployment.yaml

@@ -18,8 +18,6 @@ spec:
       containers:
       - name: vizier-suggestion-grid
         image: katib/suggestion-grid
-        args:
-          - './grid'
         ports:
         - name: api
           containerPort: 6789

manifests/vizier/suggestion/hyperband/deployment.yaml

@@ -18,8 +18,6 @@ spec:
       containers:
       - name: vizier-suggestion-hyperband
         image: katib/suggestion-hyperband
-        args:
-          - './hyperband'
         ports:
         - name: api
           containerPort: 6789

manifests/vizier/suggestion/random/deployment.yaml

@@ -18,8 +18,6 @@ spec:
       containers:
       - name: vizier-suggestion-random
         image: katib/suggestion-random
-        args:
-          - './random'
         ports:
         - name: api
           containerPort: 6789

suggestion/grid/Dockerfile

@@ -1,10 +1,10 @@
-FROM golang
-RUN : && \
-    go get google.golang.org/grpc && \
-    :
-ADD api $GOPATH/src/github.com/kubeflow/hp-tuning/api
-ADD db $GOPATH/src/github.com/kubeflow/hp-tuning/db
-ADD manager $GOPATH/src/github.com/kubeflow/hp-tuning/manager
-ADD suggestion $GOPATH/src/github.com/kubeflow/hp-tuning/suggestion
-WORKDIR $GOPATH/src/github.com/kubeflow/hp-tuning/suggestion/grid
+FROM golang:alpine AS build-env
+# The GOPATH in the image is /go.
+ADD . /go/src/github.com/kubeflow/hp-tuning
+WORKDIR /go/src/github.com/kubeflow/hp-tuning/suggestion/grid
 RUN go build -o grid
+
+FROM alpine:3.7
+WORKDIR /app
+COPY --from=build-env /go/src/github.com/kubeflow/hp-tuning/suggestion/grid /app/
+ENTRYPOINT ["./grid"]

suggestion/hyperband/Dockerfile

@@ -1,10 +1,10 @@
-FROM golang
-RUN : && \
-    go get google.golang.org/grpc && \
-    :
-ADD api $GOPATH/src/github.com/kubeflow/hp-tuning/api
-ADD db $GOPATH/src/github.com/kubeflow/hp-tuning/db
-ADD manager $GOPATH/src/github.com/kubeflow/hp-tuning/manager
-ADD suggestion $GOPATH/src/github.com/kubeflow/hp-tuning/suggestion
-WORKDIR $GOPATH/src/github.com/kubeflow/hp-tuning/suggestion/hyperband
+FROM golang:alpine AS build-env
+# The GOPATH in the image is /go.
+ADD . /go/src/github.com/kubeflow/hp-tuning
+WORKDIR /go/src/github.com/kubeflow/hp-tuning/suggestion/hyperband
 RUN go build -o hyperband
+
+FROM alpine:3.7
+WORKDIR /app
+COPY --from=build-env /go/src/github.com/kubeflow/hp-tuning/suggestion/hyperband /app/
+ENTRYPOINT ["./hyperband"]

suggestion/random/Dockerfile

@@ -1,10 +1,10 @@
-FROM golang
-RUN : && \
-    go get google.golang.org/grpc && \
-    :
-ADD api $GOPATH/src/github.com/kubeflow/hp-tuning/api
-ADD db $GOPATH/src/github.com/kubeflow/hp-tuning/db
-ADD manager $GOPATH/src/github.com/kubeflow/hp-tuning/manager
-ADD suggestion $GOPATH/src/github.com/kubeflow/hp-tuning/suggestion
-WORKDIR $GOPATH/src/github.com/kubeflow/hp-tuning/suggestion/random
+FROM golang:alpine AS build-env
+# The GOPATH in the image is /go.
+ADD . /go/src/github.com/kubeflow/hp-tuning
+WORKDIR /go/src/github.com/kubeflow/hp-tuning/suggestion/random
 RUN go build -o random
+
+FROM alpine:3.7
+WORKDIR /app
+COPY --from=build-env /go/src/github.com/kubeflow/hp-tuning/suggestion/random /app/
+ENTRYPOINT ["./random"]