Software Delivery in 2016 - A Continuous Delivery Approach

Software Delivery in 2016 - A Continuous Delivery Approach

The speech "Software Delivery in 2016" was held by Giovanni Toraldo (Lead Developer at ClouDesire) on July 1st 2016 in Pisa, Italy.
Event: Apericoder
Organizer: Coders TUG

#coderstug #cloudesire #devops #continuousdelivery #CD #jenkins #chef #flyway #git

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Giovanni Toraldo

July 01, 2016
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Transcript

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    Who am I? Giovanni Toraldo (gionn) Lead developer ClouDesire. com

    -- Lord of Jenkins Protector of the build Watcher of the stacktraces
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    What is ClouDesire? Application Marketplace to help software vendors to

    sell and provision applications • Web Applications: ◦ provision VM ◦ on multiple cloud providers ◦ deploy/upgrade docker containers ◦ application logging ◦ resource monitoring • With multi-tenant applications/SaaS: ◦ expose REST hooks and API for billing lifecycle • manage subscriptions, billing, pay-per-use, invoicing, payments. 3
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    What is Continuous Delivery? “Continuous delivery (CD) is a software

    engineering approach in which teams produce software in short cycles, ensuring that the software can be reliably released at any time. It aims at building, testing, and releasing software faster and more frequently. The approach helps reduce the cost, time, and risk of delivering changes by allowing for more incremental updates to applications in production.” https://en.wikipedia.org/wiki/Continuous_delivery
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    The road to enlightenment • Configuration Management • Data management

    • Continuous Integration • Automated Deployment
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    Configuration Management • Keep *everything* in VCS. • Managed software

    dependencies • Your application should be configurable • Avoid long-living branches
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    Data management • Scripted schema migrations • Dataset for development

    • Be backward and forward compatible (when possible)
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    Continuous Integration • Requirements: ◦ Versioned sources ◦ Build tool

    ◦ Automated tests • Features ◦ Early feedback on how things are going ◦ Feedback shared with all the team ◦ Keep track on how things are going ◦ Dashboard for automation
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    Jenkins for the CI • Easy installation: Just run java

    -jar jenkins.war, or deploy it in a servlet container, or system packages. • Easy configuration: via friendly web GUI with on-the-fly error checks and inline help. • Extensibility: Most parts of Jenkins can be extended and modified, and there plugins for every needs. • Distributed builds: Jenkins can distribute build/test loads to multiple computers with different operating systems.
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    What is a pipeline? “is an automated manifestation of your

    process for getting software from version control into the hands of your users.” Jez Humble and David Farley - Continuous Delivery
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    One job “pipeline” for simple java app Prerequisites: • Version

    Control System (GIT, Mercurial, SVN..) • Dependency management (NPM, Gem, Composer, …) • Build system (Maven, Gradle, ...) Jenkins will: 1. Grab the latest code 2. Execute commands you want 3. Report status
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    Pipeline with different stages Every stage is a different job,

    for example: 1. Compilation / dependencies check job (faster) 2. Static analysis job (fast) 3. Unit test job (fastest) 4. Component test job (slowish) 5. Integration test job (slow) 6. Packaging job (fast)
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    Configure multiple jobs pipeline • Configure different jobs, each with

    different commands • Enable notification of another job upon completion • If a job fail, pipeline is interrupted
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    More complex pipelines (parallelization) • Parallel job execution ◦ Speed-up

    feedback loop • Per-node limit to avoid job clash via Throttle Concurrent Builds Plugin
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    More complex pipelines (diamond job) Execute multiple build in parallel,

    wait for completion, then execute another job. • Join plugin
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    Static analysis reports (Java centric) • Checkstyle: coding standards •

    FindBugs: find bugs on bytecode • PMD: find bugs on source code • CPD: copy-paste detector • Open task: scan for FIXME, HACK, XXX...
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    Building GH pull requests Pull requests are great for: •

    Enabling code review • Execute all the tests before merging to master GitHub pull request builder plugin
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    Code review Pros: • Ensure use-cases are respected • Catch

    bugs early • Catch distraction errors • Enforce coding quality • Rise the bar among developers
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    Automated Deployment • Requirements: ◦ Versioned sources ◦ Build tool

    ◦ Automated tests • Features ◦ Automated deploy procedure ◦ Easy roll-back when things go wrong ◦ Easy management of multiple environments
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    Chef-zero (ex Chef-Solo) • Ruby DSL • Recipes organized in

    cookbooks • Everything is versioned in a git repository • Environment management • Single node management • Data in JSON
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    Chef cookbooks tests and packaging • Multiple cookbooks for multiple

    stacks ◦ Test-kitchen ▪ GCE backend 1. Each cookbook job notifies downstream cookbooks. 2. Every cookbook notifies the gatekeeper job 3. If gatekeeper is green, cookbook-builder job build a tar.gz with all the current cookbooks and upload via SCP.
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    Push parameters while notifying job Build another job, with a

    chosen environment variable populated.
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    Multi-cloud integration tests 50+ parallels tests: • of different applications

    with different stacks ◦ Wordpress php+mysql ◦ ... ◦ Docker applications • on multiple cloud providers ◦ Empty VM ◦ Sample applications
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