spark报错——无法访问WebUI

        笔者在安装spark，并配置spark高可用后，发现无法访问spark的WebUI，即无法访问http://localhost:8080，并且spark启动无报错，shell登入正常，唯独无法访问WebUI，通过日志最后发现，并非无法访问WebUI，而是spark在启动中，无法绑定到端口8080，导致spark绑定到其他端口，所以无法通过8080访问WebUI。同时，无法访问WebUI也有很多原因，如进程启动失败等导致，建议读者通过日志记录查找问题，最后通过搜索引擎解决问题。

        关于进程启动失败，而无法访问WebUI，请看笔者这篇文章

hadoop报错——ResourceManager无法启动

2023-04-17 00:50:12 WARN  Utils:66 - Service 'MasterUI' could not bind on port 8080. Attempting port 8081.
2023-04-17 00:50:12 INFO  AbstractConnector:278 - Started ServerConnector@46484b5a{HTTP/1.1,[http/1.1]}{0.0.0.0:8081}
2023-04-17 00:50:12 INFO  Utils:54 - Successfully started service 'MasterUI' on port 8081.
2023-04-17 00:50:12 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@5e20ffdd{/app,null,AVAILABLE,@Spark}
2023-04-17 00:50:12 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@43e624f0{/app/json,null,AVAILABLE,@Spark}
2023-04-17 00:50:12 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@26fed2bc{/,null,AVAILABLE,@Spark}
2023-04-17 00:50:12 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@386e4c9c{/json,null,AVAILABLE,@Spark}
2023-04-17 00:50:12 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@4a5d3ec5{/static,null,AVAILABLE,@Spark}
2023-04-17 00:50:12 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@1108cb1{/app/kill,null,AVAILABLE,@Spark}
2023-04-17 00:50:12 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@65f4283c{/driver/kill,null,AVAILABLE,@Spark}
2023-04-17 00:50:12 INFO  MasterWebUI:54 - Bound MasterWebUI to 0.0.0.0, and started at http://hadoop01:8081

2023-04-17 00:50:45 WARN  Utils:66 - Service 'MasterUI' could not bind on port 8080. Attempting port 8081.
2023-04-17 00:50:45 WARN  Utils:66 - Service 'MasterUI' could not bind on port 8081. Attempting port 8082.
2023-04-17 00:50:45 INFO  AbstractConnector:278 - Started ServerConnector@757cfe25{HTTP/1.1,[http/1.1]}{0.0.0.0:8082}
2023-04-17 00:50:45 INFO  Utils:54 - Successfully started service 'MasterUI' on port 8082.
2023-04-17 00:50:45 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@655e308{/app,null,AVAILABLE,@Spark}
2023-04-17 00:50:45 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@1d0b89ed{/app/json,null,AVAILABLE,@Spark}
2023-04-17 00:50:45 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@4df72772{/,null,AVAILABLE,@Spark}
2023-04-17 00:50:45 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@1f208e55{/json,null,AVAILABLE,@Spark}
2023-04-17 00:50:45 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@5e2538bd{/static,null,AVAILABLE,@Spark}
2023-04-17 00:50:45 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@4bd3f384{/app/kill,null,AVAILABLE,@Spark}
2023-04-17 00:50:45 INFO  ContextHandler:781 - Started o.s.j.s.ServletContextHandler@44748657{/driver/kill,null,AVAILABLE,@Spark}
2023-04-17 00:50:45 INFO  MasterWebUI:54 - Bound MasterWebUI to 0.0.0.0, and started at http://hadoop02:8082