why does this error log keeps on when the server workers correctly?

[ghost]

[2019-12-05T16:25:27,483][INFO ][org.logstash.beats.Server][main] Starting server on port: 5044 [2019-12-05T16:25:33,700][ERROR][logstash.javapipeline ][main] A plugin had an unrecoverable error. Will restart this plugin. Pipeline_id:main Plugin: <LogStash::Inputs::Beats ssl_certificate=>"/etc/logstash/certs/server.crt", ssl_key=>"/etc/logstash/certs/logstash.p8", ssl_verify_mode=>"none", port=>5044, host=>"192.168.0.150", id=>"c14f985e894cad105368187d4b90507c21e8788df0eb8b01025e8cdfa0e0ae54", ssl=>true, enable_metric=>true, codec=><LogStash::Codecs::Plain id=>"plain_64f1b2aa-e822-4014-92da-7bde58051e25", enable_metric=>true, charset=>"UTF-8">, add_hostname=>false, ssl_peer_metadata=>false, include_codec_tag=>true, ssl_handshake_timeout=>10000, tls_min_version=>1, tls_max_version=>1.2, cipher_suites=>["TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384", "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384", "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256", "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256", "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384", "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384", "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256", "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256"], client_inactivity_timeout=>60, executor_threads=>4> Error: Address already in use Exception: Java::JavaNet::BindException Stack: sun.nio.ch.Net.bind0(Native Method) sun.nio.ch.Net.bind(sun/nio/ch/Net.java:461) sun.nio.ch.Net.bind(sun/nio/ch/Net.java:453) sun.nio.ch.ServerSocketChannelImpl.bind(sun/nio/ch/ServerSocketChannelImpl.java:227) io.netty.channel.socket.nio.NioServerSocketChannel.doBind(io/netty/channel/socket/nio/NioServerSocketChannel.java:130) io.netty.channel.AbstractChannel$AbstractUnsafe.bind(io/netty/channel/AbstractChannel.java:558) io.netty.channel.DefaultChannelPipeline$HeadContext.bind(io/netty/channel/DefaultChannelPipeline.java:1358) io.netty.channel.AbstractChannelHandlerContext.invokeBind(io/netty/channel/AbstractChannelHandlerContext.java:501) io.netty.channel.AbstractChannelHandlerContext.bind(io/netty/channel/AbstractChannelHandlerContext.java:486) io.netty.channel.DefaultChannelPipeline.bind(io/netty/channel/DefaultChannelPipeline.java:1019) io.netty.channel.AbstractChannel.bind(io/netty/channel/AbstractChannel.java:254) io.netty.bootstrap.AbstractBootstrap$2.run(io/netty/bootstrap/AbstractBootstrap.java:366) io.netty.util.concurrent.AbstractEventExecutor.safeExecute(io/netty/util/concurrent/AbstractEventExecutor.java:163) io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(io/netty/util/concurrent/SingleThreadEventExecutor.java:404) io.netty.channel.nio.NioEventLoop.run(io/netty/channel/nio/NioEventLoop.java:462) io.netty.util.concurrent.SingleThreadEventExecutor$5.run(io/netty/util/concurrent/SingleThreadEventExecutor.java:897) io.netty.util.concurrent.FastThreadLocalRunnable.run(io/netty/util/concurrent/FastThreadLocalRunnable.java:30) java.lang.Thread.run(java/lang/Thread.java:834) [2019-12-05T16:25:34,701][INFO ][org.logstash.beats.Server][main] Starting server on port: 45004 [2019-12-05T16:25:40,920][ERROR][logstash.javapipeline ][main] A plugin had an unrecoverable error. Will restart this plugin. Pipeline_id:main Plugin: <LogStash::Inputs::Beats ssl_certificate=>"/etc/logstash/certs/server.crt", ssl_key=>"/etc/logstash/certs/logstash.p8", ssl_verify_mode=>"none", port=>5044, host=>"192.168.0.56", id=>"c14f985e894cad105368187d4b90507c21e8788df0eb8b01025e8cdfa0e0ae54", ssl=>true, enable_metric=>true, codec=><LogStash::Codecs::Plain id=>"plain_64f1b2aa-e822-4014-92da-7bde58051e25", enable_metric=>true, charset=>"UTF-8">, add_hostname=>false, ssl_peer_metadata=>false, include_codec_tag=>true, ssl_handshake_timeout=>10000, tls_min_version=>1, tls_max_version=>1.2, cipher_suites=>["TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384", "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384", "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256", "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256", "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384", "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384", "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256", "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256"], client_inactivity_timeout=>60, executor_threads=>4> Error: Address already in use Exception: Java::JavaNet::BindException Stack: sun.nio.ch.Net.bind0(Native Method) sun.nio.ch.Net.bind(sun/nio/ch/Net.java:461) sun.nio.ch.Net.bind(sun/nio/ch/Net.java:453) sun.nio.ch.ServerSocketChannelImpl.bind(sun/nio/ch/ServerSocketChannelImpl.java:227) io.netty.channel.socket.nio.NioServerSocketChannel.doBind(io/netty/channel/socket/nio/NioServerSocketChannel.java:130) io.netty.channel.AbstractChannel$AbstractUnsafe.bind(io/netty/channel/AbstractChannel.java:558) io.netty.channel.DefaultChannelPipeline$HeadContext.bind(io/netty/channel/DefaultChannelPipeline.java:1358) io.netty.channel.AbstractChannelHandlerContext.invokeBind(io/netty/channel/AbstractChannelHandlerContext.java:501) io.netty.channel.AbstractChannelHandlerContext.bind(io/netty/channel/AbstractChannelHandlerContext.java:486) io.netty.channel.DefaultChannelPipeline.bind(io/netty/channel/DefaultChannelPipeline.java:1019) io.netty.channel.AbstractChannel.bind(io/netty/channel/AbstractChannel.java:254) io.netty.bootstrap.AbstractBootstrap$2.run(io/netty/bootstrap/AbstractBootstrap.java:366) io.netty.util.concurrent.AbstractEventExecutor.safeExecute(io/netty/util/concurrent/AbstractEventExecutor.java:163) io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(io/netty/util/concurrent/SingleThreadEventExecutor.java:404) io.netty.channel.nio.NioEventLoop.run(io/netty/channel/nio/NioEventLoop.java:462) io.netty.util.concurrent.SingleThreadEventExecutor$5.run(io/netty/util/concurrent/SingleThreadEventExecutor.java:897) io.netty.util.concurrent.FastThreadLocalRunnable.run(io/netty/util/concurrent/FastThreadLocalRunnable.java:30) java.lang.Thread.run(java/lang/Thread.java:834) [2019-12-05T16:25:41,921][INFO ][org.logstash.beats.Server][main] Starting server on port: 5044

[jsvd]

do you have two beats input in with the same port in your configuration?

[ghost]

do you have two beats input in with the same port in your configuration?

no

[jsvd]

then another process is already binding that port (running netstat -an | grep 5044) may help here. you can also run logstash with --log.level=debug --config.debug and post the result here

[bizmate]

Just to add that if you deploy a separate configuration exposing beats but do not remove the default one then you might end up with two beat inputs on port 5044. This happens if you use for sure the default config of the docker images docker.elastic.co/logstash/logstash and add a separate configuration for your app.