Function main

src/slave/main.cpp:245–812

int main(int argc, char** argv)
{
  // The order of initialization is as follows:
  // * Windows socket stack.
  // * Validate flags.
  // * Logging
  // * Log build information.
  // * Libprocess
  // * Version process
  // * Firewall rules: should be initialized before initializing HTTP endpoints.
  // * Modules: Load module libraries and manifests before they
  //   can be instantiated.
  // * Anonymous modules: Later components such as Allocators, and master
  //   contender/detector might depend upon anonymous modules.
  // * Hooks.
  // * Systemd support (if it exists).
  // * Fetcher, SecretResolver, and Containerizer.
  // * Master detector.
  // * Authorizer.
  // * Garbage collector.
  // * Task status update manager.
  // * Resource estimator.
  // * QoS controller.
  // * `Agent` process.
  //
  // TODO(avinash): Add more comments discussing the rationale behind for this
  // particular component ordering.

  GOOGLE_PROTOBUF_VERIFY_VERSION;

  slave::Flags flags;

  Try<flags::Warnings> load = flags.load("MESOS_", argc, argv);

  if (flags.help) {
    cout << flags.usage() << endl;
    return EXIT_SUCCESS;
  }

  if (flags.version) {
    cout << "mesos" << " " << MESOS_VERSION << endl;
    return EXIT_SUCCESS;
  }

  if (load.isError()) {
    cerr << load.error() << "\n\n"
         << "See `mesos-agent --help` for a list of supported flags." << endl;
    return EXIT_FAILURE;
  }

  logging::initialize(argv[0], true, flags); // Catch signals.

  // Log any flag warnings (after logging is initialized).
  foreach (const flags::Warning& warning, load->warnings) {
    LOG(WARNING) << warning.message;
  }

  // Check that agent's version has the expected format (SemVer).