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Orchestration at scales

Preparation:

  • Create VMs with docker-fundamentals script.

  • Put ips.txt file in prepare-vms directory.

  • Generate HTML file.

  • Open it in Chrome.

  • Transform to PDF.

  • Print it.

  • Make sure that you have SSH keys loaded (ssh-add -l).

  • Source rc.

  • Run pcopykey.

  • Source postprep.rc. (This will install a few extra packages, add entries to /etc/hosts, generate SSH keys, and deploy them on all hosts.)

  • Set one group of machines for instructor's use.

  • Remove it from ips.txt.

  • Log into the first machine.

  • Git clone this repo.

  • Put up the web server.

  • Use cli53 to add an A record for view.dckr.info.

Description

Chaos Monkey.

App: pseudo-cryptocurrency?

  • datastore: redis
  • rng: microservice generating randomness
  • hasher: microservice computing hashes (really just computing sha256sum)
  • worker: microservice using the previous two to "mine" currency; a coin is a random string whose hash starts with at least one zero; they are stored in the datastore
  • webui: display statistics

(Details: use map sha256->randorigin; also maintain a list of length 1000 containing timestamps; compute hash speed by CARD/(NOW()-oldest_ts))

Initial worker has a bug, and takes only 4 first bytes of seed

Intro to the environment

  • SSH with password
  • SSH with keys
  • docker run blahblah
  • sudo
  • parallel-ssh example

Intro to the app

Deploy app on single machine

  • Docker Compose
  • frontend, backend, worker, datastore
  • check CPU usage with docker top; docker stats; top
  • cadvisor
  • introduce ambassador/balancer
  • scale appropriately
  • fix bug, redeploy

Clean up

  • Stop all containers

Get started with Swarm

  • Explain that machine would take care of this
  • Enable SSL certs everywhere
  • Create token
  • Start swarm master on node1
  • Start swarm agent everywhere
  • Point CLI to swarm master
  • Check docker info, docker version
  • Run a few hello worlds

Deploy with Swarm

  • compose up -> doesn't work because build
  • docker-compose-tag + push
  • docker-compose-pull
  • replace each "linked-to" service by ambassador + single service
    • workers: as is
    • redis: single service + amba
    • backend: scaled + lb; lb is haproxy with net:container
  • scale up and see results
  • check cadvisor

Deploy with Mesos

TODO

  • write pseudo miner
  • write deployment scripts
  • write chaos monkey
  • docker-compose-tag
  • docker-compose-pull
  • haproxy ambassador
  • docker-compose 1.3