selenium hub log

gistfile1.txt

$ composer selenium-server-hub
> ./vendor/bin/selenium-server-standalone -role hub 
08:21:30.005 INFO - Selenium build info: version: '3.7.1', revision: '8a0099a'
08:21:30.007 INFO - Launching Selenium Grid hub
2018-02-07 08:21:30.639:INFO::main: Logging initialized @1075ms to org.seleniumhq.jetty9.util.log.StdErrLog
08:21:30.664 INFO - Will listen on 4444
2018-02-07 08:21:30.736:INFO:osjs.Server:main: jetty-9.4.5.v20170502
2018-02-07 08:21:30.783:INFO:osjs.session:main: DefaultSessionIdManager workerName=node0
2018-02-07 08:21:30.784:INFO:osjs.session:main: No SessionScavenger set, using defaults
2018-02-07 08:21:30.788:INFO:osjs.session:main: Scavenging every 660000ms
2018-02-07 08:21:30.796:INFO:osjsh.ContextHandler:main: Started o.s.j.s.ServletContextHandler@306279ee{/,null,AVAILABLE}
2018-02-07 08:21:30.837:INFO:osjs.AbstractConnector:main: Started ServerConnector@587c290d{HTTP/1.1,[http/1.1]}{0.0.0.0:4444}
2018-02-07 08:21:30.838:INFO:osjs.Server:main: Started @1273ms
08:21:30.839 INFO - Nodes should register to http://192.168.1.3:4444/grid/register/
08:21:30.839 INFO - Selenium Grid hub is up and running
08:21:34.328 INFO - Registered a node http://192.168.1.8:4723
08:22:03.124 INFO - Registered a node http://192.168.1.8:4724
08:24:54.699 INFO - Got a request to create a new session: Capabilities {browserName: Safari, deviceName: iPad, platformName: ios, platformVersion: 11.2.5}
08:24:54.699 INFO - Trying to create a new session on test slot {platformVersion=11.2.5, automationName=XCUITest, browserName=Safari, maxInstances=1, platformName=iOS, deviceName=iPad}
08:24:56.799 INFO - Got a request to create a new session: Capabilities {browserName: Safari, deviceName: iPad, platformName: ios, platformVersion: 11.2.5}
08:24:56.799 INFO - Trying to create a new session on test slot {platformVersion=11.2.5, automationName=XCUITest, browserName=Safari, maxInstances=1, platformName=iOS, deviceName=iPad}
08:24:58.023 INFO - Got a request to create a new session: Capabilities {browserName: Safari, deviceName: iPad, platformName: ios, platformVersion: 11.2.5}
08:24:58.024 INFO - Trying to create a new session on test slot {platformVersion=11.2.5, automationName=XCUITest, browserName=Safari, maxInstances=1, platformName=iOS, deviceName=iPad}
08:25:16.863 INFO - Marking the node http://192.168.1.8:4724 as down: cannot reach the node for 2 tries
08:26:18.192 INFO - Unregistering the node http://192.168.1.8:4724 because it's been down for 61329 milliseconds
08:26:18.192 WARN - Cleaning up stale test sessions on the unregistered node http://192.168.1.8:4724