Lab - Source-to-Image

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Step 1 - Create a new Project Space

In the Wetty terminal, create a new project.

oc new-project s2i-userYOUR#

Step 2 - Go Get S2I Library

cd ~

go get github.com/openshift/source-to-image

Step 3 - Build the S2I Tooling

cd $GOPATH/src/github.com/openshift/source-to-image

hack/build-go.sh

export PATH=$PATH:${GOPATH}/src/github.com/openshift/source-to-image/_output/local/bin/linux/amd64/

Step 4 - Create the S2I Project

cd ~

s2i create golang-s2i golang-s2i

Now let’s inspect the project directory

tree -a golang-s2i

Step 5 - Edit the Dockerfile

cd ~

cat /dev/null > ~/golang-s2i/Dockerfile

vi ~/golang-s2i/Dockerfile

Copy the following text and paste it in to the editor.

# golang-s2i
FROM fedora

ENV BUILDER_VERSION 1.0
ENV HOME /opt/app-root
ENV GOPATH $HOME/gopath
ENV PATH $PATH:$GOROOT/bin:$GOBIN

LABEL io.k8s.description="Platform for building go based programs" \
      io.k8s.display-name="gobuilder 0.0.1" \
      io.openshift.expose-services="8080:http" \
      io.openshift.tags="gobuilder,0.0.1" \
      io.openshift.s2i.scripts-url="image:///usr/local/s2i" \
      io.openshift.s2i.destination="/opt/app-root/destination"

RUN yum clean all && \
    yum install -y git-remote-bzr \
                   golang \
		           glide && \
    yum clean all && rm -rf /var/cache/yum/*

COPY ./s2i/bin/ /usr/local/s2i
RUN useradd -u 1001 -r -g 0 -d ${HOME} -s /sbin/nologin -c "Default Application User" default && \
    mkdir -p /opt/app-root/destination/{src,artifacts} && \ 
    chown -R 1001:0 $HOME && \
    chmod -R og+rwx ${HOME}

WORKDIR ${HOME}
USER 1001
EXPOSE 8080

To exit vi:

shift+z

shift+z

Step 6 - Edit the Assemble Script

cat /dev/null > ~/golang-s2i/s2i/bin/assemble

vi ~/golang-s2i/s2i/bin/assemble

Copy the following into the editor.

#!/bin/bash
#
# S2I assemble script for the 'golang-s2i' image.
export GO_REPO=$(echo $OPENSHIFT_BUILD_SOURCE | sed --expression='s/\.git//g' | sed --expression='s/https:\/\///g')
if [ -z "$GO_REPO" ]; then
  export GO_REPO=$(grep ^package /opt/app-root/destination/src/glide.yaml | sed 's/package: //')
fi

mkdir -p $GOPATH/src/$GO_REPO

# Copy the source
cp -ar /opt/app-root/destination/src/* $GOPATH/src/$GO_REPO
rm -rf /opt/app-root/destination/src/*

# Restore build artifacts
if [ "$(ls /opt/app-root/destination/artifacts/ 2>/dev/null)" ]; then
    echo "Using artifacts from previous build."
    mv /opt/app-root/destination/artifacts/vendor $GOPATH/src/$GO_REPO/vendor
else
    pushd $GOPATH/src/$GO_REPO
    echo "Obtaining artifacts."
    glide install -v
    popd

fi

go build -o goexec $GO_REPO

To exit vi:

shift+z

shift+z

Step 7 - Edit the Run Script

cat /dev/null > ~/golang-s2i/s2i/bin/run

vi ~/golang-s2i/s2i/bin/run

Copy the following into the editor.

#!/bin/bash
exec /opt/app-root/goexec $ARGS

To exit vi:

shift+z

shift+z

Step 8 - Edit the Save Artifacts Script

cat /dev/null > ~/golang-s2i/s2i/bin/save-artifacts

vi ~/golang-s2i/s2i/bin/save-artifacts

Copy the following into the editor.

#!/bin/bash

export GO_REPO=$(echo $OPENSHIFT_BUILD_SOURCE | sed --expression='s/\.git//g' | sed --expression='s/https:\/\///g')
if [ -z "$GO_REPO" ]; then
  export GO_REPO=$(grep ^package /opt/app-root/destination/src/glide.yaml | sed 's/package: //')
fi
cd $GOPATH/src/$GO_REPO
tar cf - vendor

To exit vi:

shift+z

shift+z

Step 9 - Edit the Usage Script

cat /dev/null > ~/golang-s2i/s2i/bin/usage

vi ~/golang-s2i/s2i/bin/usage

Create your own script! Use the following as an example.

#!/bin/bash

echo "Hello Golang"

To exit vi:

shift+z

shift+z

Step 10 - Create the Golang S2I Builder Image

Create a new build for the Golang S2I builder image

cd ~

oc new-build golang-s2i/ --to=golang-s2i

Start the new build for the Golang S2I builder image

oc start-build golang-s2i --from-dir=golang-s2i/

Step 11 - Wait for Build to Complete

Watch the deployment

oc logs -f bc/golang-s2i

Step 12 - Deploy the App from the S2I Builder Image

oc new-app https://github.com/kevensen/openshift-gochat-client.git --image-stream=golang-s2i --env ARGS="-host :8080 -chatServer gochat-server.gochat-server.svc.cluster.local:8080 -templatePath /opt/app-root/gopath/src/github.com/kevensen/openshift-gochat-client/templates -logtostderr -insecure"

Step 13 - Expose the App

oc expose svc openshift-gochat-client

Step 14 - Annotate the Service Account to Use OpenShift Authorization

As in the previous lab, we must annotate the service account for the Gochat Client to communicate to the OpenShift API for user credential verification.

oc annotate sa/default serviceaccounts.openshift.io/oauth-redirectreference.1='{"kind":"OAuthRedirectReference","apiVersion":"v1","reference":{"kind":"Route","name":"openshift-gochat-client"}}' --overwrite

oc annotate sa/default serviceaccounts.openshift.io/oauth-redirecturi.1=auth/callback/openshift --overwrite

Step 15 - Sign in to the App

Click the blue “Login” button.

Gochat Signin

OpenShift WebUI Login

Step 16 - Test the App

Send a message!

Step 17 - Logout

Gochat Logout

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