Building a Kubernetes Platform at Pinterest

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Pinterest
Pinterest is a social bookmarking site where users collect and share photos of their favorite events, interests and hobbies. One of the fastest growing social networks online, Pinterest is the third-largest such network behind only Facebook and Twitter.

By Lida Li, June Liu, Rodrigo Menezes, Suli Xu, Harry Zhang, Roberto Rodriguez Alcala | Pinterest Software Engineers, Cloud Management Platform

Why Kubernetes?

Over the years, 300 million Pinners have saved more than 200 billion Pins on Pinterest across more than 4 billion boards. To serve this vast user base and content pool, we’ve developed thousands of services, ranging from microservices of a handful CPUs to huge monolithic services that occupy a whole VM fleet. There are also various kinds of batch jobs from all kinds of different frameworks, which can be CPU, memory or I/O intensive.

To support these diverse workloads, the infrastructure team at Pinterest is facing multiple challenges:

  • Engineers don’t have a unified experience when launching their workload. Stateless services, stateful services and batch jobs are deployed and managed by totally different tech stacks. This has created a steep learning curve for our engineers, as well as huge maintenance and customer support burdens for the infrastructure team.
  • Engineers managing their own VM fleets is creating a huge maintenance load for the infra team. Simple operations such as an OS or AMI upgrade can take weeks to months. Production workloads are also disturbed during those processes, which are supposed to be transparent to them.
  • It’s hard to build infrastructure governance tools on top of separated management systems. It’s even more difficult for us to determine who owns which machines and if they can be safely recycled.

Container orchestration systems provide a way to unify workload management. They also pave the way to faster developer velocity and easier infra governance since all running resources are managed by a centralized system.

Figure 1: Infrastructure priorities (Service Reliability, Developer Productivity and Infra Efficiency)

The Cloud Management Platform team at Pinterest started their journey on Kubernetes back in 2017. We dockerized most of our production workloads, including the core API and Web fleets, by the first half of 2017. Extensive evaluation on different container orchestration systems was then done by building prod clusters and operating real workloads on them. By the end of 2017, we decided to go down the path of Kubernetes because of its flexibility and extensive community support.

So far, we’ve built our own cluster bootstrap tools based on Kops and integrated existing infrastructure components into our Kubernetes cluster, such as network, security, metrics, logging, identity management and traffic. We introduced Pinterest-specific custom resources to model our unique workloads while hiding the runtime complexity from developers. We’re now focusing on cluster stability, scalability, and customer onboarding.

Kubernetes, the Pinterest way

Running Kubernetes to support workloads at Pinterest scale, while also making it a platform loved by our engineers, has many challenges.

As a large organization, we have invested heavily in infrastructure tools, such as security tools that handle certificates and key distribution, traffic components that enable service registration and discovery, and visibility components that ship logs and metrics. These are components built on lessons learned the hard way, so we want to integrate them into Kubernetes instead of reinventing the wheel. This also makes migration much easier, as the required support is already there for our internal applications.

On the other hand, the Kubernetes native workload model, such as deployment, jobs and daemonsets, are not enough for modeling our own workloads. Usability issues are huge blockers on the way to adopt Kubernetes. For example, we’ve heard service developers complaining about missing or misconfigured ingress messing up their endpoints. We’ve also seen batch job users using template tools to generate hundreds of copies of the same job specification and ending up with a debugging nightmare.

Runtime support for the workloads is also evolving, so it would be extremely hard to support different versions on the same Kubernetes cluster. Just imagine the complexity of customer support if we needed to face many versions of the runtime, together with the difficulties of upgrading or bug-patching for them.

Pinterest custom resources and controllers

In order to pave an easier way for our engineers to adopt Kubernetes and make infra development faster and smoother, we designed our own Custom Resource Definitions (CRDs).

The CRDs provide the following functionalities:

  1. Bundle various native Kubernetes resources together so they work as a single workload. For example, the PinterestService resource puts together a deployment, a service, an ingress and a configmap, so service developer will not need to worry about setting up DNS for their service.
  2. Inject necessary runtime support for the applications. The user only needs to focus on the container spec for their own business logic, while the CRD controller injects necessary sidecars, init containers, environment variables and volumes into their pod spec. This provides an out-of-box experience to the application engineers.
  3. CRD controllers also do life cycle management for the native resources and handle visibility and debuggability. This includes but is not limited to reconciling the desired spec and the actual spec, CRD status updating and event recording. Without CRDs, app engineers must manage a much larger set of resources, and this process has proved to be error prone.

Here’s an example of PinterestService and the native resource translated by our controller:

Figure 2: CRD to native resources. The left is the Pinterest CR written by user, and the right is the native resource definition generated by the controller.

As shown, to support a user’s container, we need to insert an init container and several sidecars for security, visibility and network traffic. Additionally, we introduced configuration map templates and PVC template support on batch jobs, as well as many environment variables to track identity, resource utilization, and garbage collection.

It’s hard to imagine engineers would be willing to hand-write these configuration files without CRD support, let alone maintain and debug the configurations.

Application Deploy Workflow

Figure 3: Pinterest CRD Overview

Figure 3 shows how to deploy a Pinterest custom resource to the Kubernetes cluster:

  1. Developers interact with our Kubernetes cluster via CLI and UI.
  2. The CLI/UI tools retrieve workflow configuration YAML files and other build properties (such as version ID) from Artifactory and send them to the Job Submission Service. This ensures only reviewed and landed workloads will be submitted to the Kubernetes cluster.
  3. The Job Submission service is the gateway to various computing platforms, including Kubernetes. User authentication, quota enforcement and partial Pinterest CRD configuration validation happens here.
  4. Once the CRD passes the Job Submission service validation, it’s sent to the Kubernetes API.
  5. Our CRD controller watches events on all custom resources. It transforms the CR into Kubernetes native resources, adds necessary sidecars into user defined pods, sets appropriate environment variables and does other necessary housekeeping work to ensure the user’s application containers have enough infrastructure support.
  6. The CRD controller then writes the resulting native resources back to the Kubernetes API so they can be picked up by the scheduler and start to run.

Note: This is the pre-release deploy workflow used by early adopters of the new Kubernetes-based Compute Platform. We are in the process of revamping this experience to be fully integrated with our new CI/CD platform to avoid exposing a lot of Kubernetes-specific details. We look forward to sharing the motivation, progress and subsequent impact in an upcoming blog post — “Building a CI/CD platform for Pinterest.”

Custom Resource Types

Based on Pinterest’s specific needs, we designed the following CRDs that suit different workflows:

  • PinterestService is the long running stateless service. Many core systems are based on a set of such services.
  • PinterestJobSet models the batch jobs that run to completion. A very common pattern within Pinterest is that multiple jobs runs the same containers in parallel, each grabbing a fraction of a workload without depending on each other.
  • PinterestCronJob is widely adopted by teams with lightweight periodic workloads. PinterestCronJob is a wrapper around the native cron job, with Pinterest-specific support such as security, traffic, log and metrics.
  • PinterestDaemon is limited to the infrastructure-related daemons. The family of PinterestDaemon is still growing as we are adding more support on our clusters.
  • PinterestTrainingJob wraps around Tensorflow and Pytorch jobs, providing the same level of runtime support as all other CRDs. Since Pinterest is a heavy user of Tensorflow and other machine learning frameworks, it makes sense to build a dedicated CRD around them.

We also have PinterestStatefulSet under construction, which will soon be adopted for storage and other stateful systems.

Runtime Support

When an application pod starts on Kubernetes, it automatically gets a certificate to identify itself. This cert is used to access the secrets store or talk to other services via mTLS. Meanwhile, the config management init containers and daemon will ensure all necessary dependencies downloaded before the application container starts. When the application container is ready, the traffic sidecar and daemon will register the pod IP to our Zookeeper in order to make it discoverable by clients. Networking has been set up for the pod by network daemon before the pod even starts.

The above are examples of typical runtime support for service workloads. Other workload types may need slightly different support, but they all come in the form of pod-level sidecars, node-level daemonsets or VM-level daemons. We make sure all of them are deployed by the infrastructure team so they are consistent between all applications, which greatly reduces the maintenance and customer support burden for us.

Testing and QA

We built an end-to-end test pipeline on top of the native Kubernetes test infra. These tests are deployed to all clusters. This pipeline has caught many regression before they reach the production cluster.

Besides the testing infra, there is also monitoring and alerting systems that watch the system components’ health status, resource utilization and other critical metrics consistently, notifying us when human intervention is needed.

Alternatives

We considered some alternatives to custom resources, such as mutation admission controllers and templating systems. However, the alternatives all come with major issues, so we chose the path of CRDs.

  • Mutating admission controller has been used to inject sidecars, environment variables and other runtime support. However, it has difficulties bundling resources together as well as managing their life cycle, whereas CRD comes with reconciling, status update and lifecycle management.
  • Templating systems such as Helm charts are also widely used to launch applications with similar configurations. However, our workloads are too diverse to be managed by templates. We also need to support continuous deployment, which would be extremely error prone with templates.

Future Work

Currently, we are running mixed workloads on all of our Kubernetes clusters. In order to support workloads of different sizes and types, we are working on the following areas:

  • Cluster Federation spreads large applications over different clusters for scalability and stability.
  • Cluster Stability, Scalability and Visibility that makes sure applications reach their SLA.
  • Resource and Quota Management to make sure applications do not step on each other’s feet and the cluster scale is under control.
  • New CI/CD Platform to support Application Deployment on Kubernetes

Acknowledgements

Many engineers at Pinterest helped build the platform from the ground up. Micheal Benedict and Yongwen Xu, who lead our engineering productivity effort, have worked together on setting the direction of the compute platform, discussing the design and helping with feature prioritization from the very beginning. Jasmine Qin and Kaynan Lalone helped on the Jenkins and Artifactory integration support. Fuyuan Bie, Brain Overstreet, Wei Zhu, Ambud Sharma, Yu Yang, Jeremy Karch, Jayme Cox, and many others helped build the config management, metrics, logging, security, networking and other infra support. Jooseong Kim and George Wu helped build the Submission Service. Lastly, our early adopters Prasun Ghosh, Michael Permana, Jinfeng Zhuang and Ashish Singh provided a lot of useful feedback and feature requirements.

This post was originally posted on the Pinterest Engineering Blog

Pinterest
Pinterest is a social bookmarking site where users collect and share photos of their favorite events, interests and hobbies. One of the fastest growing social networks online, Pinterest is the third-largest such network behind only Facebook and Twitter.
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<div class="content-intro"><p><strong>About Pinterest</strong><span style="font-weight: 400;">:&nbsp;&nbsp;</span></p><p>Millions of people across the world come to Pinterest to find new ideas every day. It’s where they get inspiration, dream about new possibilities and plan for what matters most. Our mission is to help those people find their inspiration and create a life they love.&nbsp;In your role, you’ll be challenged to take on work that upholds this mission and pushes Pinterest forward. You’ll grow as a person and leader in your field, all the while helping&nbsp;Pinners&nbsp;make their lives better in the positive corner of the internet.</p><p><em>Our new progressive work model is called PinFlex, a term that’s uniquely Pinterest to describe our flexible approach to living and working. Visit our </em><a href="https://www.pinterestcareers.com/pinflex/" target="_blank"><em><u>PinFlex</u></em></a><em> landing page to learn more.&nbsp;</em></p></div><p><strong>What you’ll do:</strong></p><ul><li style="font-weight: 400;"><span style="font-weight: 400;">Build product features into existing VOCHI app to enrich it with a lot of video/audio editing tools&nbsp; (effects, filters, canvas, trim/split/merge, audio effects, speed and other)</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Knit across teams by collaborating with Product managers and designers and other functions to build smooth Feed and Video editor experience</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Prototype and create integrative solutions that can be utilized both in VOCHI and Pinterest mobile clients</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Contribute best-in-class programming skills to develop highly innovative consumer-facing mobile products</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Contribute to and lead each step of the product development process, from ideation to implementation to release; from rapidly prototyping, running A/B test, to architecting and building solutions that can scale to support millions of users</span></li></ul><p><strong>What we’re looking for:</strong></p><ul><li style="font-weight: 400;"><span style="font-weight: 400;">6+ years of software engineering experience</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">4+ years of industry experience in developing iOS applications</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Deep understanding of developing on iOS devices in Swift</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Deep understanding of Clean Architecture principles, and different design patterns</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Strong skills and great product sense</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Knowledge on multi-threading, memory management and caching on mobile application</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Strong communication skills</span></li></ul><p>&nbsp;</p><div class="content-conclusion"><p><strong>Our Commitment to Diversity:</strong></p><p>At Pinterest, our mission is to bring everyone the inspiration to create a life they love—and that includes our employees. We’re taking on the most exciting challenges of our working lives, and we succeed with a team that represents an inclusive and diverse set of identities and backgrounds.</p></div>
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San Francisco, CA, US; Palo Alto, CA, US; Seattle, WA, US
<div class="content-intro"><p><strong>About Pinterest</strong><span style="font-weight: 400;">:&nbsp;&nbsp;</span></p><p>Millions of people across the world come to Pinterest to find new ideas every day. It’s where they get inspiration, dream about new possibilities and plan for what matters most. Our mission is to help those people find their inspiration and create a life they love.&nbsp;In your role, you’ll be challenged to take on work that upholds this mission and pushes Pinterest forward. You’ll grow as a person and leader in your field, all the while helping&nbsp;Pinners&nbsp;make their lives better in the positive corner of the internet.</p><p><em>Our new progressive work model is called PinFlex, a term that’s uniquely Pinterest to describe our flexible approach to living and working. Visit our </em><a href="https://www.pinterestcareers.com/pinflex/" target="_blank"><em><u>PinFlex</u></em></a><em> landing page to learn more.&nbsp;</em></p></div><p><span style="font-weight: 400;">You will lead a data science ML engineering organization that is responsible for data driven insights and ML solutions that aim to optimize the Ads marketplace at Pinterest spanning the both advertiser life-cycle and ads delivery funnel. Using your strong analytical skill sets, thorough understanding of machine learning, online auctions and experience in managing large engineering organizations you’ll advance the state of the art in ML and auction theory while at the same time </span><span style="font-weight: 400;">unlocking</span><span style="font-weight: 400;">&nbsp;Pinterest’s monetization potential.&nbsp; In short, this is a unique position, where you’ll get the freedom to work across the organization to bring together pinners, content creators and advertisers in this unique marketplace.</span></p><p><strong>What you’ll do:</strong></p><ul><li style="font-weight: 400;"><span style="font-weight: 400;">Manage a large organization of ML engineers, data scientists and economists responsible for data drive insights and ML solutions that power the monetization efforts at Pinterest</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Provide technical and organizational leadership to grow the organization in alignment with the business needs</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Manage and grow managers of managers and principal ML experts</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Collaborate with engineering and product leadership to define and execute the Monetization vision for Pinterest&nbsp;</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Build strong and effective XFN collaborations across the company with Sales, BizOps, Data eng and Core</span></li></ul><p><strong>What we’re looking for:</strong></p><ul><li style="font-weight: 400;"><span style="font-weight: 400;">MSc. or Ph.D. degree in Economics, Statistics, Computer Science or related field</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">12+ years of relevant industry experience</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">8+ years of management experience</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">XFN collaborator and a strong communicator</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Bridge builder who drives alignment across the engineering and product organization at Pinterest</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Hands-on experience building large-scale ML systems and/or Ads domain knowledge</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Strong mathematical skills with knowledge of statistical models</span></li></ul><p>#LI-TG1</p><div class="content-conclusion"><p><strong>Our Commitment to Diversity:</strong></p><p>At Pinterest, our mission is to bring everyone the inspiration to create a life they love—and that includes our employees. We’re taking on the most exciting challenges of our working lives, and we succeed with a team that represents an inclusive and diverse set of identities and backgrounds.</p></div>
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Toronto, ON, CA
<div class="content-intro"><p><strong>About Pinterest</strong><span style="font-weight: 400;">:&nbsp;&nbsp;</span></p><p>Millions of people across the world come to Pinterest to find new ideas every day. It’s where they get inspiration, dream about new possibilities and plan for what matters most. Our mission is to help those people find their inspiration and create a life they love.&nbsp;In your role, you’ll be challenged to take on work that upholds this mission and pushes Pinterest forward. You’ll grow as a person and leader in your field, all the while helping&nbsp;Pinners&nbsp;make their lives better in the positive corner of the internet.</p><p><em>Our new progressive work model is called PinFlex, a term that’s uniquely Pinterest to describe our flexible approach to living and working. Visit our </em><a href="https://www.pinterestcareers.com/pinflex/" target="_blank"><em><u>PinFlex</u></em></a><em> landing page to learn more.&nbsp;</em></p></div><p><span style="font-weight: 400;">Shopping is at the core of Pinterest’s mission to help people create a life they love. The shopping product team at Pinterest is inventing a brand new, more visual and personalized shopping experience for 350M+ users worldwide. The team is responsible for inspiring Pinners to shop, helping them find the best product and </span><span style="font-weight: 400;">providing </span><span style="font-weight: 400;">seamless checkout </span><span style="font-weight: 400;">experience.&nbsp;</span></p><p><span style="font-weight: 400;">You’ll be responsible for building an Android application that enables Pinners to create the life they love with product discovery and decision experiences that guide from inspiration to purchase. </span><span style="font-weight: 400;">Working closely with the design team, you’ll build beautiful </span><span style="font-weight: 400;">Android</span><span style="font-weight: 400;"> shopping applications for phones and tablets.</span></p><p><strong>What you'll do:</strong></p><ul><li style="font-weight: 400;"><span style="font-weight: 400;">Build features to power the future of Shopping on Pinterest</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Contribute to and lead each step of the product development process, from ideation to implementation to release; from rapidly prototyping, running A/B tests, to architecting and building solutions that can scale to support millions of users</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Work with cross functional peers (PM, Design) to define the product roadmap</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Analyze and visualize data to drive product insights and to inform our decisions</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Contribute best-in-class programming skills to develop highly innovative consumer-facing mobile products</span></li></ul><p><strong>What we're looking for:</strong></p><ul><li style="font-weight: 400;"><span style="font-weight: 400;">2+ years of industry </span><span style="font-weight: 400;">Android</span><span style="font-weight: 400;"> application development experience&nbsp;</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Experience in building consumer facing products on </span><span style="font-weight: 400;">Android</span><span style="font-weight: 400;"> platforms for a rapidly iterating product</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Holistic knowledge and passion for the </span><span style="font-weight: 400;">Android</span><span style="font-weight: 400;"> platform</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Strong command of data that could help improve the user experience</span></li><li style="font-weight: 400;"><span style="font-weight: 400;">Strong communication skills and great product intuition</span></li></ul><p><span style="font-weight: 400;"><span data-sheets-value="{&quot;1&quot;:2,&quot;2&quot;:&quot;#LI-NO1&quot;}" data-sheets-userformat="{&quot;2&quot;:14524,&quot;5&quot;:{&quot;1&quot;:[{&quot;1&quot;:2,&quot;2&quot;:0,&quot;5&quot;:{&quot;1&quot;:2,&quot;2&quot;:0}},{&quot;1&quot;:0,&quot;2&quot;:0,&quot;3&quot;:3},{&quot;1&quot;:1,&quot;2&quot;:0,&quot;4&quot;:1}]},&quot;6&quot;:{&quot;1&quot;:[{&quot;1&quot;:2,&quot;2&quot;:0,&quot;5&quot;:{&quot;1&quot;:2,&quot;2&quot;:0}},{&quot;1&quot;:0,&quot;2&quot;:0,&quot;3&quot;:3},{&quot;1&quot;:1,&quot;2&quot;:0,&quot;4&quot;:1}]},&quot;7&quot;:{&quot;1&quot;:[{&quot;1&quot;:2,&quot;2&quot;:0,&quot;5&quot;:{&quot;1&quot;:2,&quot;2&quot;:0}},{&quot;1&quot;:0,&quot;2&quot;:0,&quot;3&quot;:3},{&quot;1&quot;:1,&quot;2&quot;:0,&quot;4&quot;:1}]},&quot;8&quot;:{&quot;1&quot;:[{&quot;1&quot;:2,&quot;2&quot;:0,&quot;5&quot;:{&quot;1&quot;:2,&quot;2&quot;:0}},{&quot;1&quot;:0,&quot;2&quot;:0,&quot;3&quot;:3},{&quot;1&quot;:1,&quot;2&quot;:0,&quot;4&quot;:1}]},&quot;10&quot;:2,&quot;14&quot;:{&quot;1&quot;:2,&quot;2&quot;:0},&quot;15&quot;:&quot;Calibri&quot;,&quot;16&quot;:12}">#LI-NO1</span></span></p><div class="content-conclusion"><p><strong>Our Commitment to Diversity:</strong></p><p>At Pinterest, our mission is to bring everyone the inspiration to create a life they love—and that includes our employees. We’re taking on the most exciting challenges of our working lives, and we succeed with a team that represents an inclusive and diverse set of identities and backgrounds.</p></div>
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