Zero Downtime Deployment Golden Rules

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Zero Downtime Deployment Golden Rules Tugberk Ugurlu Redgate Software @tourismgeek http://tugberkugurlu.com #itakeunconf

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@tourismgeek tugberkugurlu.com github.com/tugberkugurlu stackoverflow.com/users/463785/tugberk

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@redgate

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#itakeunconf Example HTTP APIs v1 Example Android iPhone Example Android Client Example Web Client Example HTTP APIs v1.1

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Why Should I Care? #itakeunconf

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http://customers.agriya.com/products/private-shop/features/maintenance-course #itakeunconf

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https://twitter.com/tourismgeek/status/580270772402393088 #itakeunconf

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Continuous Delivery #itakeunconf

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#itakeunconf

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Type of Products #itakeunconf

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Type of Applications • HTTP Services • Web Sites #itakeunconf

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Write Down the Deployment Strategy #itakeunconf

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#itakeunconf

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Script out the Deployment Strategy #itakeunconf

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#itakeunconf

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Release Management Software https://octopus.com/ #itakeunconf

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#itakeunconf

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True Staging Environment #itakeunconf

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example-api-v0-6786234 example Products example-api-v0-6327638 example Products Router v0.example.com

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Blue-green Deployment http://martinfowler.com/bliki/BlueGreenDeployment.html #itakeunconf

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Router v0.example.com #itakeunconf example-api-v0-6327638 example Products example-api-v0-6786234 example Products

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Drain Requests #itakeunconf

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Router v0.example.com #itakeunconf example-api-v0-6327638 example Products example-api-v0-6786234 example Products

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Router v0.example.com #itakeunconf example-api-v0-6327638 example Products example-api-v0-6786234 example Products

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SemVer Your Software http://www.tugberkugurlu.com/archive/versioning-software-builds-based-on-git-tags-and-semantic-versioning-semver #itakeunconf

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SemVer Your Software • See semver.org • Support 2 Major versions of the HTTP Service, not 1, not 3. • Define a support policy for support lifetime for versions #itakeunconf

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Type of Changes • Patch: No user facing changes, all internal. • Minor: Add functionality in a backwards-compatible manner • Major: Introducing incompatible changes • See semver.org for more information #itakeunconf

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Minor-Patch Releases • No breaking changes #itakeunconf

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example-api-v0-6327638 example-api-v0-7814219 example-api-v0-9528392 LB v0.example.com example Products example Products example Products example-api-v0-6786234 example-api-v0-3266280 example-api-v0-8429842 example Products example Products example Products

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DEMO https://github.com/tugberkugurlu/aspnetcoresamples/tree/itakeu16/haproxy-zero-downtime-sample #itakeunconf

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HAProxy Config Reload http://engineeringblog.yelp.com/2015/04/true-zero-downtime-haproxy-reloads.html #itakeunconf

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Internal LB-1 LB-1 Internal LB-2 server1 server2 server3 server4 server5 server6 server7 server8 server9 server10 client client client client client client #itakeunconf

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Multiple Load Balancer Nodes http://robert.penz.name/386/howto-setup-a-haproxy-as-fault-tolerant-high-available-load-balancer-for-multiple-caching-web-proxies-on-rhelcentossl/ #itakeunconf

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#itakeunconf http://robert.penz.name/386/howto-setup-a-haproxy-as-fault-tolerant-high-available-load-balancer-for-multiple-caching-web-proxies-on-rhelcentossl/

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Major Releases • Breaking Changes • First Major Release • Non-first Major Releases #itakeunconf

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example-api-v0-6327638 example-api-v0-7814219 example-api-v0-9528392 LB v0.example.com example Products example Products example Products example-api-v1-2276168 example-api-v1-5677802 example Products example Products LB v1.example.com example-api-v1-7182721 example Products

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Prefer Fast-forward Database Changes #itakeunconf

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#itakeunconf Id Make Model Colour 1 Renault Clio Red 2 Mercedes GLA Black 3 Volkswagen Polo White 4 Toyota Yaris Yellow Id Make Model Colour 1 Renault Clio Red 2 Mercedes GLA Black 3 Volkswagen Polo White 4 Toyota Yaris Yellow v1 v2

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Do Not Override Client Side Assets #itakeunconf

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#itakeunconf v1 v1.1

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#itakeunconf v1 v1.1

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Be Aware of the Context #itakeunconf

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Be Aware of the Context • Cookies • Sessions • Authentication Tokens

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Sticky Sessions http://blog.haproxy.com/2012/03/29/load-balancing-affinity-persistence-sticky-sessions-what-you-need-to-know/

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Helpful Tools • HAProxy • Octopus Deploy • node-semver CLI • Docker • Docker Cloud (a.k.a. Tutum) • DLM Automation Tools from Redgate #itakeunconf