Who?

Lin Jen-Shin (godfat)

• 2001~2004: C
• 2004~2009: ActionScript
• 2005~2008: C++
• 2006~2017: Ruby
• 2007~2017: (learning) Haskell

GitLab?

GKE?

• Google Kubernetes Engine

GKE?

• Google Kubernetes Container Engine
• GCE = Google Compute Engine
• There are only 17,000 three-letter acronyms." -- Paul Boutin

Kubernetes?

• Open source container cluster manager
• Originally designed by Google
• Usually container = Docker

It's The Future

-Yeah, I was saying about Kubernetes.

-That let’s you orchestrate all your services.

Overview

Prepare GKE

• Reserve static IP
• Add A records (e.g. *.gitlab.godfat.org) on your DNS
• Create cluster
• Connect to the cluster via kubectl proxy
• http://localhost:8001/ui

Setup GitLab on GKE

git clone https://gitlab.com/gitlab-org/kubernetes-gitlab-demo.git

env GITLAB_GKE_IP=104.199.210.42 \
    GITLAB_GKE_DOMAIN=gitlab.godfat.org \
    GITLAB_LEGO_EMAIL=jen-shin@gitlab.com \
    bash generate.bash

kubectl create -f gitlab-gitlab-godfat-org.yml

https://gitlab.gitlab.godfat.org/

What's installed

• GitLab Community Edition
• GitLab Runner
• Container Registry
• Mattermost
• Prometheus
• Let's Encrypt

Let's play

• https://gitlab.gitlab.godfat.org/
• Setup admin
• Setup group
• Setup project (import from ↓)
• https://gitlab.com/gitlab-examples/minimal-ruby-app.git

server.rb

require 'webrick'

server = WEBrick::HTTPServer.new :Port => 5000

server.mount_proc '/' do |request, response|
  response.body = 'Hello, world!'
end

server.start

Dockerfile

FROM ruby:2.4.0-alpine
ADD ./ /app/
WORKDIR /app
ENV PORT 5000
EXPOSE 5000

CMD ["sh", "-c",
     "while :; do ruby ./server.rb; done"]

Setup Kubernetes for CI/CD

• TODO: Configure this automatically
• Go to Project Settings > Integrations
• Scroll to Project Services
• Select Kubernetes

Copy Kubernetes API endpoint

• Go to GCP, Container Engine tab
• Click on cluster
• Copy Endpoint to API URL in GitLab, making it an HTTPS URL
  (Try https://gitlab.godfat.org)

Copy Kubernetes credentials

• Go to Kubernetes Dashboard that is proxied on your localhost
• Navigate to Secrets > Config on the left
• Click on default-token-xxx for the default namespace
• Copy token (last item) to Service token in GitLab
• Copy ca.crt (first item, including BEGIN and END lines) to
  Custom CA bundle in GitLab

Setup Mattermost command

• TODO: Configure this automatically #23964, #25269
• Go to Project Settings > Integrations
• Scroll to Project Services
• Select Mattermost Command
• Click Add to Mattermost

Setup Mattermost team

• Click join a team link
• Click create a new team
• Go back to GitLab
• Refresh (or Click Go Back)

Setup GitLab Auto-Deploy

• TODO: Configure this automatically #26453, #28496, #28497
• Go to Project, click Set up auto deploy
• Choose Kubernetes template
• Change KUBE_DOMAIN from
  domain.example.com to gitlab.godfat.org
• Change Target Branch to master

Idea to production

Idea (Chat)

• Go to Mattermost https://mattermost.gitlab.godfat.org
• Type: Let's improve the homepage!
• Type: /minimal-ruby-app help

/minimal-ruby-app issue new Make homepage more descriptive

Currently it is just Hello World.

Issue (Tracker)

• Click on the link that starts with #1

Plan (Board)

• Go to Issues > Board
• Add default lists
• Drag issue from Backlog to Doing

Code (Terminal)

• TODO: #23966, #23968, #27336
• Go to Pipelines
• Go to Environments
• Click Staging
• Click Terminal button (on the upper right, 1st on right)

Program online

• ls
• vi server.rb
• i (to insert)
• Update text to Updated Hello World
• esc (to go back to normal mode)
• ZZ (to save and close)
• killall ruby
• Click external URL link on top right (2nd from right)

Commit (Repo)

• Go to Repository
• Go to server.rb
• Click Edit button
• Add Updated in front of Hello, world!
• Set target branch to 1-homepage

Test (CI)

• TODO: #26941
• Click on Pipelines
• Click on first (top) pipeline's status

Runner progress (for fun)

• Go to Kubernetes Dashboard
• Change Namespace to default
• Click on Pods
• Change the Namespace drop-down to minimal-ruby-app
• Click on Pods

Review (MR)

• Go back to the Merge Request and go to the tab Changes
• Click on a change line to show ability to comment
• Comment Looks good to me
• Go to Discussion tab to see comment
• Click on external link to review app
  (if it is not updated, go to the review app deployment history, find the second-last item and re-deploy)
• Merge to master

Staging (CD)

• Go to Pipelines
• Click on Merge Requests, Merged, and click on !1
• Click on Staging URL to show that changes got deployed

Production (ChatOps)

• Go to Mattermost https://mattermost.gitlab.godfat.org
• Type /minimal-ruby-app deploy staging to production
• Click on the link
• Wait until it is done
• Go to Environments
• Click production link (1st on right, beside production)

Feedback (Cycle Analytics)

• Click Cycle Analytics

Feedback (Monitoring)

• Prometheus Monitoring https://prometheus.gitlab.godfat.org
• Copy 1 - rate(node_cpu{mode="idle"}[5m])
  into the Expression bar. Hit enter
• Click Graph
• Copy (1 - ((node_memory_MemFree + node_memory_Cached) / node_memory_MemTotal)) * 100
  into the Expression bar. Hit enter