Chaos Engine App

ChaosEngine app nominate randomly a different MoD and On-call person for every Gameday. The On-Call person is different from the normal process, so the team can practice and act independently when the time comes.

The Chaos Engine App is integrated in Mattermost and you can create:

• Chaos Configure /chaos-engine configure --scheme "<sqlite3 | postgres | postgresql>" --url "<valid database URL for the specified scheme>"
• Chaos Teams create /chaos-engine team create --name sre --member @spiros
• Chaos Teams add another member /chaos-engine team create --name sre --member @bar
• Chaos Teams list /chaos-engine team list
• Chaos Gamedays create /chaos-engine gameday create --name "Chaos: K8s Node failures" --team sre --schedule-at "2021-25-08 07:00:00"
• Chaos Gameday Start /chaos-engine gameday start --id nopcyfhsd7fhpf3g1978mibd3w
• Chaos Gameday Complete /chaos-engine gameday complete --id nopcyfhsd7fhpf3g1978mibd3w
• Chaos Gameday Cancel /chaos-engine gameday cancel --id nopcyfhsd7fhpf3g1978mibd3w
• Chaos Gameday list /chaos-engine gameday list

Running

Here are available configuration to run the app:

Name	Default	Description
debug	false	debug logging
address	:3000	listening address
app.type	http	mattermost app type
app.root_url	http://localhost:3000	the root url of the app
app.secret	secretkey	The secret key to install the app in Mattermost and JWT authentication
db.scheme	nil	the scheme, supports sqlite3, postgres, postgresql
db.url	nil	the database URL which can be sqlite DB or Postgres DSN e.g: sqlite3://engine.db
db.idle_conns	2	the number of idle connections
db.max_open_conns	1	the max number of open connections
db.max_conn_lifetime	1	the max connection lifetime

Run the server:

make run

By default the application if you run will use sqlite3 database (for local dev only) and will listen to :3000 and the root url will be http://localhost:3000

Overriding defaults

There are two ways to override the defaults.

• config.yml file only for local development
• environment variables with prefix CHAOS_ENGINE_*

An example with config.yml for local dev only:

debug: true
environment: prod
address: ":3001"
# mattermost app config
app:
 type: http
 root_url: "http://localhost:3000"
# database config
db:
 scheme: sqlite3
 url: "sqlite3://mytestdb.db"

An example with environment variables:

CHAOS_ENGINE_DEBUG=true
CHAOS_ENGINE_ADDRESS=":3000"
CHAOS_ENGINE_APP_TYPE="http"
CHAOS_ENGINE_DB_SCHEME="sqlite3"

Lint

Linting the codebase:

make lint

Test

Run the tests:

make test

DEV env with Mattermost

You can run this docker-compose to run Mattermost and install your app with the following slash command.

/apps install http http://localhost:3000/manifest