Scheduling Applications at Scale with Nomad

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Scheduling Applications at Scale with Nomad Photo by Sašo Tušar on Unsplash @anubhavm 

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@anubhavm Anubhav Mishra Developer Advocate, HashiCorp

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@anubhavm Anubhav Mishra Developer Advocate, HashiCorp has stickers Atlan&s Gopher Artwork by Ashley McNamara

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PROVISION, SECURE AND RUN ANY INFRASTRUCTURE Nomad Consul Vault Vagrant Packer Terraform Consul Enterprise Terraform Enterprise Vault Enterprise PRODUCT SUITE OSS TOOL SUITE RUN Applications SECURE Application Infrastructure PROVISION Infrastructure FOR INDIVIDUALS FOR TEAMS Nomad Enterprise

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Scheduler Photo by Emma Matthews on Unsplash

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Designing

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@anubhavm  !23 Multi-Datacenter Multi-Region Flexible Workloads Job Priorities Bin Packing Large Scale Operationally Simple

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@anubhavm  !26 Cluster Management Gossip Based (P2P) Membership Failure Detection Event System Serf

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@anubhavm  !27 Service Mesh Service Discovery Conﬁguration Coordination (Locking) Central Servers + Distributed Clients

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@anubhavm  !32 Inspired by Google Omega Optimistic Concurrency State Coordination Service & Batch workloads Pluggable Architecture

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Copyright © 2017 HashiCorp @anubhavm  Consul Cluster !33 CLIENT CLIENT CLIENT CLIENT CLIENT CLIENT SERVER SERVER SERVER REPLICATION REPLICATION RPC RPC LAN GOSSIP SERVER SERVER SERVER REPLICATION REPLICATION WAN GOSSIP

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Copyright © 2017 HashiCorp @anubhavm  Single Region Architecture !34 SERVER SERVER SERVER CLIENT CLIENT CLIENT DC1 DC2 DC3 FOLLOWER LEADER FOLLOWER REPLICATION FORWARDING REPLICATION FORWARDING RPC RPC RPC

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Copyright © 2017 HashiCorp @anubhavm  Multi Region Architecture !35 SERVER SERVER SERVER FOLLOWER LEADER FOLLOWER REPLICATION FORWARDING REPLICATION REGION B  GOSSIP REPLICATION REPLICATION FORWARDING REGION FORWARDING  REGION A SERVER FOLLOWER SERVER SERVER LEADER FOLLOWER

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Installing and Configuring

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Terminal $ nomad agent -config=/path/to/config.hcl

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Terminal $ echo "let’s try it?"

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Job File

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@anubhavm  !X job "redis" { datacenters = ["us-east-1"] task "redis" { driver = "docker" config { image = "redis:latest" } resources { cpu = 500 # Mhz memory = 256 # MB network { mbits = 10 port "redis" {} } } } }

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@anubhavm  !X job "webserver" { datacenters = ["us-east-1"] task "webserver" { driver = "exec" config { command = "yet-another-golang-webserver" } artifact { source = "https://github.com/download/../yet-another-golang-webserver" } resources { cpu = 500 # Mhz memory = 128 # MB network { port "http" { static = 8080 } } } } }

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Terminal $ echo "let’s try it?"

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Job Types

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Copyright © 2017 HashiCorp @anubhavm  Service Scheduler Job Type The service scheduler is designed for scheduling long-lived services that should never go down. The service scheduler ranks a large portion of the nodes that meet the jobs constraints and selects the optimal node to place a task group on. Examples: webapp, redis Job Types: Service !54

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Copyright © 2017 HashiCorp @anubhavm  Batch Scheduler Job Type Batch jobs are less sensitive to short-term performance ﬂuctuations and are short lived, ﬁnishing after some period. Examples: billing, data replication Job Types: Batch !55

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Copyright © 2017 HashiCorp @anubhavm  System Scheduler Job Type The system scheduler is used to register jobs that should be run on all clients that meet the job's constraints. The system scheduler is also invoked when clients join the cluster or transition into the ready state. Examples: logging agent, security auditing tool Job Types: System !56

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Drivers

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@anubhavm  !58 Containerized Virtualized Standalone Docker Qemu / KVM Java Jar Static Binaries rkt LXC

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@anubhavm  !59 Containerized Virtualized Standalone Docker Qemu / KVM Java Jar Static Binaries rkt LXC Windows Server Containers Hyper-V Xen C#

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Service Discovery

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Copyright © 2017 HashiCorp @anubhavm  Consul is a free and open-source tool by HashiCorp that implements service discovery. It uses the RAFT and gossip protocols to reach massive scale. It has integrations with health checks, so unhealthy services are not added to the service discovery layer. Similar client-server model to Nomad. Service Discovery using Consul !61

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@anubhavm  !X job "redis" { datacenters = [“us-east-1”] service { name = "redis" port = "redis" check { type = "tcp" port = "redis" interval = "10s" timeout = "5s" } } }

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Terminal $ echo "let’s try it?"

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Advanced Job Strategies

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@anubhavm  !X job "redis" { # Add an update stanza to enable rolling updates of the service update { max_parallel = 1 min_healthy_time = "30s" healthy_deadline = "10m" } ..... }

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@anubhavm  !X job "redis" { # Add an update stanza to enable rolling updates of the service update { max_parallel = 1 canary = 5 min_healthy_time = "30s" auto_revert = true } ..... }

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Terminal $ echo "let’s try it?"

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@anubhavm  !69 Multi-Datacenter Multi-Region Flexible Workloads Job Priorities Bin Packing Large Scale Operationally Simple

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@anubhavm  !70 Multi-Datacenter Multi-Region Flexible Workloads Job Priorities Bin Packing Large Scale Operationally Simple

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Nomad Million Container Challenge 1,000 Jobs 1,000 Tasks per Job 5,000 Hosts on GCE 1,000,000 Containers

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www.hashicorp.com FOR EVERYONE, EVERYWHERE Thank You! I have stickers! Ask me anything. @anubhavm Anubhav Mishra