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

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