397 lines
15 KiB
Plaintext
397 lines
15 KiB
Plaintext
---
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description: |-
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Nomad is a highly available, distributed, data-center aware cluster and
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application scheduler designed to support the modern datacenter with support
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for long-running services, batch jobs, and much more.
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---
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<header>
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<div class="container hero">
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<div class="row">
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<div class="col-md-offset-2 col-md-8">
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<%= inline_svg "logo-hashicorp.svg", height: 120, class: "logo" %>
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<h1>Easily Deploy Applications at Any Scale</h1>
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<a class="button primary" href="/intro/index.html">Get Started</a>
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<a class="button" href="/downloads.html">Download <%= latest_version %></a>
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</div>
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</div>
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</div>
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</header>
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<section id="features" class="marketing green">
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<div class="container">
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<div class="row">
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<div class="col-sm-12">
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<h2>Simple and Lightweight</h2>
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<p class="lead">
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Nomad is a single binary that schedules applications and services on
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Linux, Windows, and Mac. It is an open source scheduler that uses a
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declarative job file for scheduling virtualized, containerized, and
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standalone applications.
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</p>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-6">
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<h3>1. Declare Jobs</h3>
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<p>
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Users compose and submit high-level job files. Nomad handles the
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scheduling, deploying, and upgrading of the applications over time.
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</p>
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<p>
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This flexibilty makes it easy to deploy one container, dozens of
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containers, or even <a
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href="https://www.hashicorp.com/c1m/">millions</a>.
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</p>
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</div>
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<div class="col-sm-6">
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<h3>2. Plan Changes</h3>
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<p>
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With the built-in dry-run execution, Nomad shows what scheduling
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decisions it will take, before it takes them. Operators can approve or
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deny these changes to create a safe and reproducible workflow.
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</p>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-6">
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<h3>3. Run Applications</h3>
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<p>
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Nomad runs applications and ensures they keep running in failure
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scenarios. In addition to long-running services, Nomad can schedule
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batch jobs, distributed cron jobs, or parameterized jobs.
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</p>
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</div>
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<div class="col-sm-6">
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<h3>4. Monitor Progress</h3>
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<p>
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Stream logs, send signals, and interact with the filesystem of
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scheduled applications. These operator-friendly commands bring the
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familiar debugging tools to a scheduled world.
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</p>
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</div>
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</div>
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</div>
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</section>
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<section id="hybrid-multi-cloud" class="marketing">
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<div class="container">
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<div class="row">
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<div class="col-sm-12">
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<span class="callout">Combine</span>
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<h2>Hybrid & Multi Cloud</h2>
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<p class="lead">
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As more organizations migrate to cloud technologies, the desire to
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run in multiple datacenters and multiple regions becomes critical.
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Nomad can span public and private clouds and treat all your
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infrastructure as a pool of resources.
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</p>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-12">
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<%= inline_svg "feature-public-private-clouds.svg" %>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-6">
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<h3>Hybrid Cloud</h3>
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<p>
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Nomad can bridge the gap between the public and private cloud,
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creating a unified interface for developers to deploy and run any
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application on any platform. Easily run services across your internal
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private cloud and external public cloud transparently to application
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developers.
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</p>
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</div>
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<div class="col-sm-6">
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<h3>Multi Cloud</h3>
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<p>
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As more organizations migrate to cloud technologies, the desire to run
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applications simultaneously across multiple clouds increases. Nomad
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combines the power of all cloud providers into a single, unified
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interface for deploying applications and running services.
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</p>
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</div>
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</div>
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</div>
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</section>
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<section id="simplify" class="marketing green">
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<div class="container">
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<div class="row">
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<div class="col-sm-12">
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<span class="callout">Maintain</span>
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<h2>Simplify Operations</h2>
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<p class="lead">
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Nomad simplifies operations by supporting blue/green deployments,
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automatically handling machine failures, and providing a single
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workflow to deploy applications.
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</p>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-6">
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<%= inline_svg "feature-simplify.svg" %>
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</div>
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<div class="col-sm-6">
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<h3>Blue/Green Deployments</h3>
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<p>
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Nomad supports blue/green and canary deployments through the
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declarative job file syntax. By specifying multiple task groups,
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Nomad allows for easily changing the quantity and parameters of
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each group to perform automatic or manual rolling deploys.
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</p>
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<h3>Automatic Machine Failures</h3>
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<p>
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Because it knows the state of all nodes and applications, if a
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node becomes unhealthy, Nomad will automatically reschedule the
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applications that were previously running on the unhealthy host
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onto a new, healthy host if capacity exists. As new clients are
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added to the cluster, they can share the responsibility of
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running applications and services.
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</p>
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</div>
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</div>
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</div>
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</section>
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<section id="flexible-workloads" class="marketing">
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<div class="container">
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<div class="row">
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<div class="col-sm-12">
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<span class="callout">Support</span>
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<h2>Flexible Workloads</h2>
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<p class="lead">
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In addition to supporting Linux, Windows, and Mac, Nomad has
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extensible support for containerized, virtualized, and standalone
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applications. Easily start Docker containers, VMs, or application
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runtimes like Java.
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</p>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-12">
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<%= inline_svg "feature-flexible-workloads.svg" %>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-6">
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<h3>Diverse Technologies</h3>
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<p>
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By supporting a wide range of technologies such as Docker, RKT, and
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LXC, Nomad does not force you into a single technology. Easily use
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multiple container or virtualization runtimes simultaneously.
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Applications with their own runtime such as Java or Golang can be
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scheduled directly without the overhead of a container.
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</p>
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</div>
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<div class="col-sm-6">
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<h3>Multi OS</h3>
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<p>
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The Nomad client runs on Linux, Windows, and Mac OS. This diverse
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operating system support enables using the same application scheduler
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for all your scheduling and runtime needs.
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</p>
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</div>
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</div>
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</div>
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</section>
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<section id="binpacking" class="marketing black">
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<div class="container">
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<div class="row">
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<div class="col-sm-12">
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<span class="callout">Maximize</span>
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<h2>Increase Utilization & Reduce Costs</h2>
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<p class="lead">
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Nomad uses bin packing to optimize application placement onto servers
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to maximize resource utilization, increase density, and help reduce
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costs.
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</p>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-12">
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<%= inline_svg "feature-binpacking.svg" %>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-6">
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<h3>Increase Density</h3>
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<p>
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Nomad places applications and services based on a bin packing
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algorithm, which is used to optimize the resource utilization and
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density of applications, but is also augmented by affinity and
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anti-affinity rules. This algorithm ensures maximum utilization of
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resources such as CPU, memory, and disk.
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</p>
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</div>
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<div class="col-sm-6">
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<h3>Reduce Costs</h3>
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<p>
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By maximizing resource utilization, Nomad can help remove unused or
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under-utilized machines in the cluster, reducing overall costs.
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Additionally, Nomad enables organizations to utilize larger, more
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cost-effective compute devices which can be less expensive at scale.
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</p>
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</div>
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</div>
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</div>
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</section>
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<section id="examples" class="marketing gray">
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<div class="container">
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<div class="row">
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<div class="col-sm-12">
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<h2>Examples</h2>
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<h3>Create and Submit Jobs</h3>
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<p>
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Easily create, validate, submit, and check the status of jobs using
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the Nomad CLI.
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</p>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-12">
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<div class="terminal">
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<span class="circle"><%= inline_svg "terminal-circle.svg" %></span>
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<span class="circle"><%= inline_svg "terminal-circle.svg" %></span>
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<span class="circle"><%= inline_svg "terminal-circle.svg" %></span>
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<div class="terminal-content">
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<span>
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<span class="text-green">admin@hashicorp.com:</span>
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<span>nomad init</span>
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</span>
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<span>Example job file written to example.nomad</span>
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<span> </span>
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<span>
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<span class="text-green">admin@hashicorp.com:</span>
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<span>nomad validate example.nomad</span>
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</span>
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<span>Job validation successful</span>
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<span> </span>
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<span>
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<span class="text-green">admin@hashicorp.com:</span>
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<span>nomad run example.nomad</span>
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</span>
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<span>==> Monitoring evaluation "feb23392"</span>
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<span class="pre"> Evaluation triggered by job "example"</span>
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<span class="pre"> Evaluation within deployment: "7ffa7ed1"</span>
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<span class="pre"> Allocation "a2f24fcf" created: node "3714a84a", group "cache"</span>
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<span class="pre"> Evaluation status changed: "pending" -> "complete"</span>
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<span>==> Evaluation "feb23392" finished with status "complete"</span>
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<span> </span>
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<span>
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<span class="text-green">admin@hashicorp.com:</span>
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<span>nomad status</span>
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</span>
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<span class="pre">ID Type Priority Status Submit Date</span>
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<span class="pre">example service 50 running <%= Time.now.strftime("%m/%d/%y %H:%M:%S %Z") %></span>
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</div>
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</div>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-12">
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<h3>Plan Changes</h3>
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<p>
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Perform a dry-run execute to check application placement, scheduling
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decisions, and visualize failures before they happen.
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</p>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-12">
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<div class="terminal">
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<span class="circle"><%= inline_svg "terminal-circle.svg" %></span>
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<span class="circle"><%= inline_svg "terminal-circle.svg" %></span>
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<span class="circle"><%= inline_svg "terminal-circle.svg" %></span>
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<div class="terminal-content">
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<span>
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<span class="text-green">admin@hashicorp.com:</span>
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<span>nomad plan example.nomad</span>
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</span>
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<span class="pre"><span class="text-orange">+/-</span> <span class="text-bold">Job: "example"</span></span>
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<span class="pre"><span class="text-bold text-orange">+/-</span> <span class="text-bold">Task Group: "cache"</span> (<span class="text-green">2 create</span>, <span class="text-blue">1 in-place update</span>)</span>
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<span class="pre"> <span class="text-orange">+/-</span> Count: "1" => "3" (<span class="text-green">forces create</span>)</span>
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<span class="pre"> <span class="text-bold">Task: "redis"</span></span>
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<span> </span>
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<span class="pre"><span class="text-bold">Scheduler dry-run:</span></span>
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<span class="pre"><span class="text-bold text-green">- All tasks successfully allocated.</span></span>
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<span> </span>
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<span class="pre"><span class="text-bold">Job Modify Index: 7</span></span>
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<span> </span>
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<span>
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<span class="text-green">admin@hashicorp.com:</span>
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<span>nomad run -check-index 7 example.nomad</span>
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</span>
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<span>==> Monitoring evaluation "e338a6ae"</span>
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<span class="pre"> Evaluation triggered by job "example"</span>
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<span class="pre"> Evaluation within deployment: "43310206"</span>
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<span class="pre"> Allocation "991a0d89" created: node "c5916a99", group "cache"</span>
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<span class="pre"> Allocation "daee8be1" created: node "c5916a99", group "cache"</span>
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<span class="pre"> Allocation "83f29312" modified: node "c5916a99", group "cache"</span>
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<span class="pre"> Evaluation status changed: "pending" -> "complete"</span>
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<span>==> Evaluation "e338a6ae" finished with status "complete"</span>
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</div>
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</div>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-12">
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<h3>View Application Logs</h3>
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<p>
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Stream application logs directly in the terminal to help analyze and
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debug applications.
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</p>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-12">
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<div class="terminal">
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<span class="circle"><%= inline_svg "terminal-circle.svg" %></span>
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<span class="circle"><%= inline_svg "terminal-circle.svg" %></span>
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<span class="circle"><%= inline_svg "terminal-circle.svg" %></span>
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<div class="terminal-content">
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<span>
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<span class="text-green">admin@hashicorp.com:</span>
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<span>nomad logs -tail -job example</span>
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</span>
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<span><%= Time.now.strftime("%d %b %H:%M:%S") %> # Server started, Redis version 3.2.9</span>
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<span><%= Time.now.strftime("%d %b %H:%M:%S") %> * The server is now ready to accept connections on port 6379</span>
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</div>
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</div>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-12 col-lg-8 col-lg-offset-2">
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<p class="lead" align="center">
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The introduction contains a walkthrough guide, glossary, and a range
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of examples to experiment with Terraform.
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</p>
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<p align="center">
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<a href="/intro/index.html" class="button primary">Get Started</a>
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</p>
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</div>
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</div>
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</div>
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</section>
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