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Spotlight on CoreOS

Spotlight on CoreOS

A quick overview of CoreOS, and some quick highlights of what it can do.

Martin Smith

March 18, 2015

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  1. Spotlight on CoreOS
    [email protected]

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  2. The Datacenter as a Computer
    - Focus on applications
    - Design for HW failure
    - No maintenance windows
    - Commodity hardware
    - Warehouse scale

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  3. CoreOS
    - Micro Gentoo/Chrome (Kernel +
    - No package manager, just run in containers
    - Intended for HA clusters
    - Updates are applied automagically
    - SystemD (incl. managing containers)

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  4. Etcd
    - Distributed key-value store
    - RESTful (HTTP + JSON)
    - Service discovery via announcements
    - Similar to Consul or Zookeeper

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  5. Fleet
    - Cluster-level service management
    - Manage etcd and systemd as a single init sys
    - Schedule a specific number of containers,
    reschedule units on failure, placement rules

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  6. Demos!
    - 3 node cluster with vagrant
    - Demo dillinger.io (online markdown editor)
    vagrant ssh core-01
    fleetctl machine-list
    fleetctl list-units
    fleetctl submit dillinger.service
    fleetctl start dillinger.service
    fleetctl journal -follow dillinger.service

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