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VGCN infrastructure management

This repository defines and manages the Virtual Galaxy Compute Nodes on bwCloud/de.NBI-cloud for usegalaxy.eu

The compute nodes are defined in resources.yaml, which conforms to schema.yaml. userdata.yaml.j2 contains actions that will be run by cloud-init during the first boot of the virtual machines (see cloud-init docs).

The Jenkins project vgcn-infrastructure runs synchronize.py periodically to deploy the configured compute nodes.

resources.yaml

This file defines the resources that should be allocated on the cluster, and it is used to scale the infrastructure accordingly. An example is shown below

training_event:
    count: 4
    flavor: c.c10m55
    tag: training-fallhts2017
    start: 2017-10-01
    end:  2017-10-02

The label training_event is arbitrary but must be unique in the file. We specify that count: 4 VMs of the flavor c.c10m55 should be running. If there are fewer than this number, the vgcn-infrastructure Jenkins project will launch synchronize.py to ensure the actual capacity matches the definition.

Additionally, start and end parameters may be supplied. VMs will be launched after the start date, and will be killed after the end date. This permits defining resources ahead of the time they will be needed and releases them automatically when they are no longer in use.

A formal definition of the schema is available within schema.yaml.

Multiple flavors

Unfortunately, only a single flavor can be assigned to a group. As a workaround to using multiple flavors in a group, just create N different groups with different tags. E.g.

compute_nodes_small:
    count: 10
    flavor: c.c10m55
    tag: compute-small

compute_nodes_large:
    count: 10
    flavor: c.c24m120
    tag: compute-large