update dockerfile and build steps

backend/Dockerfile

@@ -1,23 +1,15 @@
 FROM golang:alpine as builder
 
-RUN apk add --no-cache curl git
-RUN curl -fsSL -o /bin/dep https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64 && chmod +x /bin/dep
-
-# Download and install the latest release of dep
-ADD https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64 /usr/bin/dep
-RUN chmod +x /usr/bin/dep
-
 WORKDIR /go/src/github.com/kubeflow/pipelines
 COPY . .
 
-# Needed for github.com/mattn/go-sqlite3
-RUN apk add --update gcc musl-dev
+RUN apk add --no-cache gcc musl-dev
 RUN go build -o /bin/apiserver backend/src/apiserver/*.go
 
 FROM python:3.5 as compiler
 
 RUN apt-get update -y && \
-    apt-get install --no-install-recommends -y -q default-jdk wget 
+    apt-get install --no-install-recommends -y -q default-jdk wget
 
 RUN pip3 install setuptools==40.5.0
 
@@ -42,7 +34,7 @@ COPY ./samples .
 RUN  find . -maxdepth 2 -name '*.py' -type f | while read pipeline; do dsl-compile --py "$pipeline" --output "$pipeline.tar.gz"; done
 
 
-FROM alpine
+FROM alpine:3.8
 
 ARG COMMIT_SHA=unknown
 ENV COMMIT_SHA=${COMMIT_SHA}

backend/Dockerfile.persistenceagent

@@ -1,26 +1,17 @@
 FROM golang:alpine as builder
 
-RUN apk add --no-cache curl git
-RUN curl -fsSL -o /bin/dep https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64 && chmod +x /bin/dep
-
-
-# Download and install the latest release of dep
-ADD https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64 /usr/bin/dep
-RUN chmod +x /usr/bin/dep
-
 WORKDIR /go/src/github.com/kubeflow/pipelines
 COPY . .
 
 # Needed for github.com/mattn/go-sqlite3
 RUN apk add --update gcc musl-dev
 RUN go build -o /bin/persistence_agent backend/src/agent/persistence/*.go
 
-FROM alpine
+FROM alpine:3.8
 WORKDIR /bin
 
 COPY --from=builder /bin/persistence_agent /bin/persistence_agent
 COPY --from=builder /go/src/github.com/kubeflow/pipelines/third_party/license.txt /bin/license.txt
-RUN chmod +x /bin/persistence_agent
 
 CMD persistence_agent \
   --alsologtostderr=true

backend/Dockerfile.scheduledworkflow

@@ -1,25 +1,17 @@
 FROM golang:alpine as builder
 
-RUN apk add --no-cache curl git
-RUN curl -fsSL -o /bin/dep https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64 && chmod +x /bin/dep
-
-# Download and install the latest release of dep
-ADD https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64 /usr/bin/dep
-RUN chmod +x /usr/bin/dep
-
 WORKDIR /go/src/github.com/kubeflow/pipelines
 COPY . .
 
 # Needed for github.com/mattn/go-sqlite3
 RUN apk add --update gcc musl-dev
 RUN go build -o /bin/controller backend/src/crd/controller/scheduledworkflow/*.go
 
-FROM alpine
+FROM alpine:3.8
 WORKDIR /bin
 
 COPY --from=builder /bin/controller /bin/controller
 COPY --from=builder /go/src/github.com/kubeflow/pipelines/third_party/license.txt /bin/license.txt
 RUN chmod +x /bin/controller
 
 CMD /bin/controller -alsologtostderr=true
-

developer_guide.md

@@ -38,28 +38,28 @@ $ cd ml-pipeline && ks delete default
 ### GKE
 To be able to use GKE, the Docker images need to be uploaded to a public Docker repository, such as [GCR](https://cloud.google.com/container-registry/)
 
-To build the API server image and upload it to GCR: 
+To build the API server image and upload it to GCR:
 ```bash
-# Run in the repository root directory 
-$ docker build -t gcr.io/<your-gcp-project>/api-server:latest -f backend/Dockerfile ./backend
+# Run in the repository root directory
+$ docker build -t gcr.io/<your-gcp-project>/api-server:latest -f backend/Dockerfile .
 # Push to GCR
 $ gcloud auth configure-docker
 $ docker push gcr.io/<your-gcp-project>/api-server:latest
 ```
 
-To build the scheduled workflow controller image and upload it to GCR: 
+To build the scheduled workflow controller image and upload it to GCR:
 ```bash
-# Run in the repository root directory 
-$ docker build -t gcr.io/<your-gcp-project>/scheduledworkflow:latest -f backend/Dockerfile.scheduledworkflow ./backend
+# Run in the repository root directory
+$ docker build -t gcr.io/<your-gcp-project>/scheduledworkflow:latest -f backend/Dockerfile.scheduledworkflow .
 # Push to GCR
 $ gcloud auth configure-docker
 $ docker push gcr.io/<your-gcp-project>/scheduledworkflow:latest
 ```
 
-To build the persistence agent image and upload it to GCR: 
+To build the persistence agent image and upload it to GCR:
 ```bash
-# Run in the repository root directory 
-$ docker build -t gcr.io/<your-gcp-project>/persistenceagent:latest -f backend/Dockerfile.persistenceagent ./backend
+# Run in the repository root directory
+$ docker build -t gcr.io/<your-gcp-project>/persistenceagent:latest -f backend/Dockerfile.persistenceagent .
 # Push to GCR
 $ gcloud auth configure-docker
 $ docker push gcr.io/<your-gcp-project>/persistenceagent:latest
@@ -68,7 +68,7 @@ $ docker push gcr.io/<your-gcp-project>/persistenceagent:latest
 ### Minikube
 Minikube can pick your local Docker image so you don't need to upload to remote repository.
 
-For example, to build API server image  
+For example, to build API server image
 ```bash
 $ docker build -t ml-pipeline-api-server backend/src
 ```
@@ -138,7 +138,7 @@ API server logs are located at /tmp directory of the pod. To SSH into the pod, r
 kubectl exec -it -n ${NAMESPACE} $(kubectl get pods -l app=ml-pipeline -o jsonpath='{.items[0].metadata.name}' -n ${NAMESPACE}) -- /bin/bash
 ```
 
-**Q: How to check my cluster status if I am using Minikube?**  
+**Q: How to check my cluster status if I am using Minikube?**
 
 Minikube provides dashboard for deployment
 ```bash