CoreOS and (The) Edge of Tomorrow

Presentation from the first inaugural CoreOS Meetup in London (http://www.meetup.com/CoreOS-London/)

Transcript

1. CoreOS and (The) Edge of Tomorrow
   CoreOS meetup, London
   
   13th October, 2014
   

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2. About me…
   • SysAdmin by trade (10+ years)
   
   • Programming language tourist, mostly Go, exploring
   Rust
   
   • I blog about Linux containers https://containerops.org/
   
   • Twitter: @milosgajdos
   

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3. Road to CoreOS
   “What I’m about to tell
   you sounds crazy, but you
   have to listen to me! Your
   very lives depend on it…”,
   Cage, Edge of Tomorrow
   

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4. Road to CoreOS
   Part 1 - Wake up
   

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5. Every day felt like the same day
   
   Broken HW, debugging bash scripts….
   

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6. You got in, picked up your weapons and fought
   
   Albeit the weapons were Nagios, ssh for loops….
   

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7. You learnt how to use your weapons
   
   You became a very skilful soldier
   

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8. Road to CoreOS
   Part 2 - Meet Rita
   

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9. There are smart people who care just like you do.
   
   There is hope!
   

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10. You find out about configuration management, better
    tooling and monitoring, continuos delivery etc.
    

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11. You put together a DevOps team and fight together,
    hoping some day you won’t have to fight any more….
    

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12. Road to CoreOS
    Part 3 - Grenade
    

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13. With all the infrastructure tooling you build a massive
    DevOps ship - surely you’re gonna win now!
    

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14. But the infrastructures are getting even more complex:
    
    You hazz MICROSERVICES now!
    

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15. Then you discover Docker! Surely this is it!
    
    You take it and throw it all over the infrastructure hoping to win
    once and for all!
    

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16. Road to CoreOS

    Epilogue - Evolution
    • Robot soldiers -> 

    (Micro)service delivery men
    
    • Delivering Applications -> 

    delivering Distributed Platforms
    
    • Ultimate evolution:

    SysAdmin + Devs -> DevOps -> DistOps
    • ULTIMATE QUESTION:
    • Have the OS’ evolved ?
    

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17. OS as a Service
    

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18. CoreOS
    Opening credits
    • Originally based on Chrome OS
    • Apps as Docker containers
    
    • Started with read only /, now
    read only ext4 /usr and btrfs /
    
    • etcd, systemd, fleet
    
    • Automatic updates (inspired by
    Omaha project)
    

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19. CoreOS
    Scene 1 - etcd
    • Distributed k-v store written in Go,
    
    • HTTP API (JSON)
    
    • SSL optional, ACLs in the future
    
    • TTL support
    
    • “Watch” support via HTTP long-
    polling - no push!
    
    • etcdctl client
    
    • missing proper benchmark
    information :-(
    

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20. CoreOS
    Scene 2 - fleet
    • Distributed init system built on top of
    systemd
    
    • It schedules services across the cluster
    
    • fleetd service has 2 components: 

    engine and agent
    • Service lifecycle:
    create (submit) -> schedule (load) ->run (start) -> remove (destroy)
    • fleetctl client
    

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21. CoreOS
    Scene 3 - Updates and security
    • No package manager \o/ YESSSS!
    
    • Dual partition scheme: active (live) and
    passive (for updates)
    
    • Atomic (no partial upgrade!) and
    automatic (not just available!)
    
    • signed and verified
    
    • updateservicectl to control and test
    update service
    
    • SSH key auth only BUT sudo without
    password for core user
    
    • No SELinux/AppArmor etc., YET
    

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22. CoreOS
    Closing credits
    • Still fairly young project - first stable
    release July 2014 - HUGE
    POTENTIAL
    
    • Extensive docs but some of the
    concepts are not easy to grasp
    
    • Few “??”
    
    • Security
    
    • Backup and Restore
    
    • Networking: flannel, WEAVE
    • Storage: FLOCKER
    

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23. –Rita, Edge of Tomorrow
    “Every time you die, you get smarter and you’re
    gonna make sure we will win!”
    

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24. –Bret Victor
    “The most dangerous thought you can have as
    a creative person is to think that you know
    what you are doing”
    

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