27bb2da5ee
Nomad communicates with CSI plugin tasks via gRPC. The plugin supervisor hook uses this to ping the plugin for health checks which it emits as task events. After the first successful health check the plugin supervisor registers the plugin in the client's dynamic plugin registry, which in turn creates a CSI plugin manager instance that has its own gRPC client for fingerprinting the plugin and sending mount requests. If the plugin manager instance fails to connect to the plugin on its first attempt, it exits. The plugin supervisor hook is unaware that connection failed so long as its own pings continue to work. A transient failure during plugin startup may mislead the plugin supervisor hook into thinking the plugin is up (so there's no need to restart the allocation) but no fingerprinter is started. * Refactors the gRPC client to connect on first use. This provides the plugin manager instance the ability to retry the gRPC client connection until success. * Add a 30s timeout to the plugin supervisor so that we don't poll forever waiting for a plugin that will never come back up. Minor improvements: * The plugin supervisor hook creates a new gRPC client for every probe and then throws it away. Instead, reuse the client as we do for the plugin manager. * The gRPC client constructor has a 1 second timeout. Clarify that this timeout applies to the connection and not the rest of the client lifetime. |
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README.md
Nomad 
Nomad is a simple and flexible workload orchestrator to deploy and manage containers (docker, podman), non-containerized applications (executable, Java), and virtual machines (qemu) across on-prem and clouds at scale.
Nomad is supported on Linux, Windows, and macOS. A commercial version of Nomad, Nomad Enterprise, is also available.
- Website: https://nomadproject.io
- Tutorials: HashiCorp Learn
- Forum: Discuss
- Mailing List: Google Groups
- Gitter: hashicorp-nomad
Nomad provides several key features:
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Deploy Containers and Legacy Applications: Nomad’s flexibility as an orchestrator enables an organization to run containers, legacy, and batch applications together on the same infrastructure. Nomad brings core orchestration benefits to legacy applications without needing to containerize via pluggable task drivers.
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Simple & Reliable: Nomad runs as a single binary and is entirely self contained - combining resource management and scheduling into a single system. Nomad does not require any external services for storage or coordination. Nomad automatically handles application, node, and driver failures. Nomad is distributed and resilient, using leader election and state replication to provide high availability in the event of failures.
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Device Plugins & GPU Support: Nomad offers built-in support for GPU workloads such as machine learning (ML) and artificial intelligence (AI). Nomad uses device plugins to automatically detect and utilize resources from hardware devices such as GPU, FPGAs, and TPUs.
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Federation for Multi-Region, Multi-Cloud: Nomad was designed to support infrastructure at a global scale. Nomad supports federation out-of-the-box and can deploy applications across multiple regions and clouds.
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Proven Scalability: Nomad is optimistically concurrent, which increases throughput and reduces latency for workloads. Nomad has been proven to scale to clusters of 10K+ nodes in real-world production environments.
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HashiCorp Ecosystem: Nomad integrates seamlessly with Terraform, Consul, Vault for provisioning, service discovery, and secrets management.
Quick Start
Testing
See Learn: Getting Started for instructions on setting up a local Nomad cluster for non-production use.
Optionally, find Terraform manifests for bringing up a development Nomad cluster on a public cloud in the terraform directory.
Production
See Learn: Nomad Reference Architecture for recommended practices and a reference architecture for production deployments.
Documentation
Full, comprehensive documentation is available on the Nomad website: https://www.nomadproject.io/docs
Guides are available on HashiCorp Learn.
Contributing
See the contributing directory for more developer documentation.