It's an HTTP companion to Facebook's McRouter.

It allows CRUD operation on McRouter config JSON as well as providing live stats.

# Prerequisites:
#   * It must be run on the same box where mcrouter is running.
#   * netcat command line tool must be installed.
#
# MCRHUB_CENTRAL_URLS is only useful if you want to have central daemons. That setting is optional.
#
MCROUTER_ADDR=localhost:5000 \
MCROUTER_CONFIG_FILE=./tests/mcrouter.json \
MCRHUB_CENTRAL_URLS=http://localhost:5002 \
/path/to/mcrouter-hub

The agent mode allows mcrouter-hub to collect live information about McRouter. It can also modify the configuration of local McRouter.

While in agent mode, mcrouter-hub has the following required configurations:

• MCROUTER_ADDR: McRouter host and port address.

• MCROUTER_CONFIG_FILE: Path to McRouter config file.

MCRHUB_MODE=central \
/path/to/mcrouter-hub

While in central mode, mcrouter-hub can receives configuration or stats data from all mcrouter-hub agents.

• MCROUTER_ADDR: McRouter host and port address (Required for agent mode).

• MCROUTER_CONFIG_FILE: Path to McRouter config file (Required for agent mode).

• MCRHUB_MODE: 2 modes: agent or central. Default: "agent"

• MCRHUB_READ_ONLY: Read only flag. When true, POST endpoints are disabled. Default: Agent: true, Central: false

• MCRHUB_LOG_LEVEL: Log level. Default: "info"

• MCRHUB_ADDR: The HTTP server host and port. Default: Agent: ":5001", Central: ":5002"

• MCRHUB_CERT_FILE: Path to cert file. Default: ""

• MCRHUB_KEY_FILE: Path to key file. Default: ""

• MCRHUB_TOKENS_DIR: Directory of token files. If it is not empty, each line on the file will be treated as one token. These tokens will be used for HTTP POST actions from agent to central. Tokens that exist on both sides are considered valid. Default: ""

  # Token is passed as HTTP user. Example on updating config in agent mode:
  curl -H "Content-Type: application/json" -X POST \
  -d '{"the": "json config"}' \
  -u 0b79bab50daca910b000d4f1a2b675d604257e42: https://localhost:5001/config
  

• MCRHUB_CENTRAL_URLS: URLs to mcrouter-hub central. mcrouter-hub does not use persistent storage, therefore agents report to one or more central daemons (agent mode only). Default: ""

• MCRHUB_REPORT_INTERVAL: The frequency of agent reporting (agent mode only). Default: "3s"

• NR_INSIGHTS_URL: New Relic Insights URL endpoint (agent mode only). Example: https://insights-collector.newrelic.com/v1/accounts/{AccountID}/events. Default: ""

• NR_INSIGHTS_INSERT_KEY: New Relic Insights insert key (agent mode only). Default: ""