Always be shippingMicroservice application Continuous Deployment with Docker

Linux Day Roma 2015

Oct 24th 2015

David Rossi e Francesco Uliana

demo code: github.com/francescou/docker-continuous-deployment1 / 66

Who we areFrancesco UlianaTechnologist at CNR - Reti e Sistemi Informativi

Java dev, FP languages, DevOps, IoT

@warrior10111 | www.uliana.it/francesco | github.com/francescou

David RossiSysadmin at CNR - Reti e Sistemi Informativi

GNU\Linux & FOSS evangelist

david.rossi@cnr.it

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Software deployment maturity

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Software deployment maturity - level 0build on developer machine

little/no SCM usage (e.g. git, svn)

deploy over FTP

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Software deployment maturity- level 1building automation tool (e.g. GNU Makefile, Ant, Maven,Rake)

proficient SCM usage (branches, tags)

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Software deployment maturity- level 2Unit testing (e.g. jUnit, TestNG)

Continuous Integration (e.g. Jenkins, Bamboo, CircleCI)

Artifact Repository

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Software deployment maturity- level 3externalized (and versioned) application configuration

extensive (and up to date) documentation about the releaseprocess

how to scale?

how to diff instances?

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Continuous Deployment

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Continuous Deploymentbuild software in such a way that it can be released toproduction at any time. (Martin Fowler)

short cycles

software can be reliably released at any time

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Key pointsautomated testing

Continuous Integration (CI)

rapidly, reliably and repeatedly push outenhancements/bugfixes at low risk and with minimal manualoverhead

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Benefits1. Accelerated Time to Market

2. Improved Productivity and Efficiency

3. Reliable Releases

4. Improved Product Quality

               

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Requirements and constraints1. good knowledge of several tools

2. less "agility"

3. team maturity

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Tools of the trade

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lightweight

Linux

containers

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Diagram source: Docker Inc.

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Dockerdeployment of applications inside software containers

layer of abstraction and automation of operating-system-level virtualization

> 25k stars on github

> 1100 contributors

RESTful API

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Inside a Docker Container1. your application code

2. runtime

3. system tools

4. system libraries

5. configuration

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Hands on

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Steps1. Create a Dockerfile

2. Build container image

3. Run the image

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Docker Build (1/3)francesco ~/consul-template-nginx $ ls -ltotal 12-rw-r--r-- 1 francesco francesco 498 6 ago 15.19 Dockerfile-rw-r--r-- 1 francesco francesco 507 6 ago 15.43 nginx.conf.tpl-rw-r--r-- 1 francesco francesco 93 6 ago 15.19 README.md

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Docker Build (2/3)francesco ~/consul-template-nginx $ cat Dockerfile

FROM nginx:1.9.3

WORKDIR /opt/consul-template-nginx

RUN apt-get update && apt-get install -y curl

RUN curl --location-trusted https://github.com/hashicorp/consul-template/.../consul-template_....tar.gz | tar -xz

COPY nginx.conf.tpl ./

CMD service nginx start && ./consul-template/consul-template -consul consul:8500 -template './nginx.conf.tpl:/etc/nginx/nginx.conf:service nginx reload'

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Docker Build (3/3)francesco ~/consul-template-nginx $ docker build -t myapplication:1.0 .

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Docker Rundocker run --name my-nginx -p 8080:80 myapplication:1.0

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Just a single container?

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usually...multiple services

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multiple processes

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multiple containers!

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Case study: web application4 Containers:

1. web frontend (e.g. apache, nginx)

2. web backend

3. cache (e.g. redis)

4. Database (e.g. mysql, postgres)

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Docker Compose

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docker-compose.ymlweb: image: node volumes: - ./app:/opt/ links: - db ports: - "3000:3000" command: node /opt/app/index.jsdb: image: mongo ports: - "27017:27017"

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More complex docker-compose.ymlpostgresql: image: sameersbn/postgresql:9.4-3 environment: - DB_USER=gitlab - DB_PASS=password - DB_NAME=gitlabhq_production volumes: - /srv/docker/gitlab/postgresql:/var/lib/postgresqlgitlab: image: sameersbn/gitlab:8.0.4 links: - redis:redisio - postgresql:postgresql ports: - "10080:80" - "10022:22" environment: - TZ=Asia/Kolkata - GITLAB_TIMEZONE=Kolkata - .............. volumes: - /srv/docker/gitlab/gitlab:/home/git/dataredis: image: sameersbn/redis:latest volumes: - /srv/docker/gitlab/redis:/var/lib/redis

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Manual Docker Compose deployment

docker-compose up -d

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...but(few seconds) downtime!

you still need manual intervention

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Automated application Deploymentcontinuous integration tool (e.g. Jenkins) should performdocker-compose up -d on each "release" build

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Docker Compose UI

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Docker Compose UIgithub.com/francescou/docker-compose-ui

docker-compose REST API wrapper

open source (MIT)

93 stars, 12 forks

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Continuous Deployment Lifecycle(dev perspective)git clone myrepo.gitgit co -b awesomefeatureimplement featuremerge requestmerge request acceptance triggers Jenkins Build

mvn clean installdocker build -t application:1.1curl -X POST http://docker:5000/api/v1/projects --data'{"id":"myapp"}' -H'Content-type: application/json'

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Zero downtime deployments

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Live Demosee github.com/francescou/docker-continuous-deployment

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Once in productionmonitoring

alerting

log analysis

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HA, a philosophy...

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by xkcd.com

# Last step...yum erase openssh-server

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Habits are changing...Sysadmin scope of interest becomes broader

OS is the last part, like installing java

Sysadmin needs developers procedural skills

Keyword: Automation and Planning

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Production1. Provisioning Bare Metal

2. Hardware Lifecycle management

The sysadmin must support different vendors andheterogeneous tecnologies

Use abstraction from hardware (VMs help a lot!)

Avoid lock-in tecnologies !!!

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Service must be Continuous1. Automation and planning

2. Monitoring and alerting

3. Backup & Restore

4. Failure (Hardware & Software) solving

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Context Separation1. Production, Staging, Development, ...

For the sysadmin... all is CRITICALDevelopers does't feel happy when their builds fail

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Planning1. Scheduled to... NOW!

Time is a thing you cannot buy in black market!

Infrastructure automation gives flexibility shortening timeto production

Dev and Ops can plan time for a beer... :)

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Opensource tools:1. Provisioning and configuration management service

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2. Hardware inventory service

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Opensource tools:3. Discovery, monitoring, metrics database and alertingservice

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4. Log service and log parsing dashboard

+

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ELK

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Zabbix: Cassandra nodes storage

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Zabbix: Apache metrics

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Machine Lifecycle1. Foreman builds machine (metal or VMs) with dynamictemplates

2. High monitoring automation with Zabbix low discoveryrules and templates

3. Metrics exposed to third party tools (like Grafana)

4. Production: log server configured for docker containers

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Enterprise

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Habits to avoid (-)(-) Server is a holy place but Ssh is allowed

(-) Environment separation only at physical level (when planned)

(-) Lack of strategy for log services.

(-) Limited sharing of the know-how between teams. Cooperation is limitedto problem solving

(-) Vertical scaling. Expensive hardware. Complexity increases exponentialy

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Habits to acquire (+)(+) Ssh is not to be used in production

(+) Containers permits isolation, icc off

(+) Use version control system and build environment for infrastructure

(+) Common tecnologies permit coral planning and better relationshipsbetween Ops and Dev

(+) Horizontal scaling. Commodity hardware. Complexity increases linearly

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Google commodity server

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Links:Syslog-ng server and compose ui

http://bitfieldconsulting.com/category/tags/devops

http://www.slideshare.net/albertspijkers/linux-containers-and-redhat-7pdf

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TakeawaysImmutable containers are awesome

Automate all the things

Abstract from Hardware

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Q&A time

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