Changing the log level for a selenium node ruing in docker

Our team is deploying a selenium grid within the docker container. The default log level appears to be set at INFO. I'd like to tu them up to SEVERE or completely off. I made two attempts, but neither appear to work:

Method One:

From the selenium client, I've tries to set LoggingPreferences on the RemoteWebDriver within DesiredCapabilities:

DesiredCapabilities desiredCapabilities = DesiredCapabilities.firefox();
LoggingPreferences logs = new LoggingPreferences();
logs.enable(LogType.BROWSER, Level.SEVERE);
logs.enable(LogType.CLIENT, Level.SEVERE);
ogs.enable(LogType.DRIVER, Level.SEVERE);
logs.enable(LogType.SERVER, Level.SEVERE);
desiredCapabilities.setCapability(CapabilityType.LOGGING_PREFS, logs);
desiredCapabilities.setCapability(FirefoxDriver.PROFILE, profile);
WebDriver driver = new RemoteWebDriver(new URL(host:4444/wd/hub"), 
                                           desiredCapabilities);

Method 2: I tried to change the profile preferences:

FirefoxProfile profile = new FirefoxProfile();

profile.setPreference("webdriver.log.driver", "OFF");
profile.setPreference("webdriver.log.file","/dev/null");

Method 3: I tried to modify config.json in the container located in /opt/selenium/config.json:

{
  "capabilities": [
    {
      "browserName": "*firefox",
      "maxInstances": 1,
      "seleniumProtocol": "Selenium"
    },
    {
      "browserName": "firefox",
      "maxInstances": 1,
      "seleniumProtocol": "WebDriver"
    }
  ],
  "configuration": {
      "proxy": "org.openqa.grid.selenium.proxy.DefaultRemoteProxy",
      "maxSession": 1,
      "port": 5555,
      "register": true,
      "registerCycle": 5000,
      "logLevel":FATAL
  }
}

So far I've been unable to do anything that has altered the logging behavior.