Nomad

HasiCorp Nomad

Cheat sheet

Allocations are like pods, it contains one or more 'tasks'

Tasks are just containers

Job files contain all the information about the deployment.

Task	Command
Start an agent	nomad agent -dev -bind 0.0.0.0 -log-level INFO
Show node status	nomad node status
Show connected members	nomad server members
Create an example job	nomad job init
Run a job	nomad job run example.nomad
Show a job's status	nomad job status example
Examine an allocation	nomad alloc status allocation-id
Examine an allocation's logs	nomad alloc logs allocation-id task-name

Other

Consul integration

Start consul: consul agent -dev

Nomad appears to just detect this automatically, like magic.

NFS Persistent Volumes

• How do I get a container with a persistent volume via NFS?

Traefik load balancing

Configure Traefik with the consulCatalog provider in the traefik.toml configuration file:

# Enable Consul Catalog configuration backend.
[providers.consulCatalog]
    prefix           = "traefik"
    exposedByDefault = false

    [providers.consulCatalog.endpoint]
      address = "127.0.0.1:8500"
      scheme  = "http"

When defining a service within a job in Nomad, specify the following tags:

service {
      name = "demo-webapp"
      port = "http"

      tags = [
        "traefik.enable=true",
        "traefik.http.routers.http.rule=Path(`/myapp`)",
      ]

Traefik will then be notified of the new backends when changes to this service happens via Consul.

Open Questions

• Can we have the load balancing Traefik instance be an external service? If so, how?