CloudAtlas

Running

The agent, fetcher, and interpreter take optional -Dflagname=flagvalue argument. Otherwise those values are set to default ones, as described below.

Query Signer

# start rmiregistry
./scripts/registry
# generate keys
./scripts/generate_keys.sh
# run Query Signer
./gradlew runQuerySigner

Relies on generation of public and private keys by scripts/generate_keys.sh.

Flags:

• java.rmi.server.hostname - RMI registry hostname, default: localhost
• querySignerHostname - query signer public RMI API hostname, default: localhost
• publicKeyFilename - path to public key file, relative to root of project, default: build/tmp/query_signer.pub
• privateKeyFilename - path to private key file, relative to root of project, default: build/tmp/query_signer

Agent

# start rmiregistry
./scripts/registry
# start agent to bind API
./gradlew runAgent

Relies on keys generated during query signer setup.

Flags:

• java.rmi.server.hostname - RMI registry hostname, default: localhost
• freshnessPeriod - data refresh period, default: 60 * 1000
• queryPeriod - query rerun period, default: 5 * 1000
• gossipPeriod - gossiping period, default: 5 * 1000
• hostname - public UDP server hostname, default: hostname
• port - public UDP port, default: 5999
• timeout - UDP server timeout, default: 5 * 1000
• bufsize - UDP message buffer size, default: 512
• zoneSelectionStrategy - zone selection strategy for gossiping, default: RandomUniform, available options: RoundRobinExp, RoundRobinUniform, RandomExp, RandomUniform
• zonePath - zone pathname of agent, default: /uw/violet07
• publicKeyFilename - path to public key file, relative to root of project, default: build/tmp/query_signer.pub

Client

./gradlew runClient

Exposes a web application on localhost:8082.

Relies on a running agent with fetcher.

Flags:

• hostname - agent RMI API hostname, default: localhost
• zonePath - zone pathname of agent, default: /uw/violet07
• querySignerHostname - query signer RMI API hostname, default: localhost

Fetcher

./gradlew runFetcher

Sends system information to an agent.

Relies on a running agent.

Flags:

• hostname - agent RMI API hostname, default: localhost
• zonePath - zone pathname of agent, default: /uw/violet07
• ownAddr - public IP address or domain name of agent/fetcher machine
• fallbackContacts - initialize fallback contacts, default: {}, example: {"/uw/violet07":[192,168,0,11]}

Interpreter

./gradlew runInterpreter
# to suppress Gradle's output
./gradlew runInterpreter --quiet

Reads queries from standard input and outputs results to standard output, using a hard-coded test hierarchy.

Tests

./gradlew test
# test individual components
./gradlew test --tests AgentTest
./gradlew test --tests InterpreterTests.fileTest13

Generates an HTML test report at build/reports/tests/test/index.html.

Demo setup

The scripts/ directory contains a bundle of scripts that can be helpful when setting up a simple hierarchy.

Envrionment Variables

The scripts assume that there are 5 machines with hostnames rainbow01, ..., rainbow05. Each machine should have the following environment variables available:

• NODE_NUMBER: ranging from 01 to 05
• ZONE: a level-1 zone name (e.g. uw)

For example, if rainbow01 corresponds to node /uw/rainbow01 in the hierarchy, it should have NODE_NUMBER=01 and ZONE=uw.

RMI registry

Each node should have an RMI registry running, started with

./scripts/registry

Query signer

The scripts assume that the query signer runs on rainbow01. Before first starting it, run

./scripts/generate_keys.sh

to generate keys.

If rainbow01 has ssh access to the other machines, the public key can then be distributed with

./scripts/copyKey.sh

Finally, start the query signer on rainbow01 with

./scripts/runQuerySigner.sh

Agent and fetcher

On each machine, the agent and fetcher components should be started with

./scripts/runAgent.sh
./scripts/runFetcher.sh

Client (optional)

A client connected to the local agent can be optionally started with

./scripts/runClient.sh