An error is reported when the parameter skywalking.collector.backend_service is set to the domain name

[daipeng2019]

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Question

I am trying to run with this cmd

java  -Duser.timezone=Asia/Shanghai -Xms512M -Xmx512M -javaagent:/agent/skywalking-agent.jar -Dskywalking.agent.service_name=xxx-xxxx-xxxx -Dskywalking.collector.backend_service=sky_backend_service:11800 
-jar yqftwd-modules-file.jar --spring.profiles.active=test

got the error

ERROR 2021-08-23 14:39:19:931 SkywalkingAgent-12-GRPCChannelManager-0 GRPCChannelManager : Create channel to sky_backend_service:11800 fail. 
java.lang.IllegalArgumentException: Invalid host or port: sky_backend_service 11800
	at org.apache.skywalking.apm.dependencies.io.grpc.internal.GrpcUtil.authorityFromHostAndPort(GrpcUtil.java:515)
	at org.apache.skywalking.apm.dependencies.io.grpc.netty.NettyChannelBuilder.<init>(NettyChannelBuilder.java:142)
	at org.apache.skywalking.apm.dependencies.io.grpc.netty.NettyChannelBuilder.forAddress(NettyChannelBuilder.java:128)
	at org.apache.skywalking.apm.agent.core.remote.GRPCChannel.<init>(GRPCChannel.java:38)
	at org.apache.skywalking.apm.agent.core.remote.GRPCChannel.<init>(GRPCChannel.java:29)
	at org.apache.skywalking.apm.agent.core.remote.GRPCChannel$Builder.build(GRPCChannel.java:101)
	at org.apache.skywalking.apm.agent.core.remote.GRPCChannelManager.run(GRPCChannelManager.java:138)
	at org.apache.skywalking.apm.util.RunnableWithExceptionProtection.run(RunnableWithExceptionProtection.java:33)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.URISyntaxException: Illegal character in hostname at index 5: //sky_backend_service:11800
	at java.net.URI$Parser.fail(URI.java:2847)
	at java.net.URI$Parser.parseHostname(URI.java:3386)
	at java.net.URI$Parser.parseServer(URI.java:3235)
	at java.net.URI$Parser.parseAuthority(URI.java:3154)
	at java.net.URI$Parser.parseHierarchical(URI.java:3096)
	at java.net.URI$Parser.parse(URI.java:3062)
	at java.net.URI.<init>(URI.java:673)
	at org.apache.skywalking.apm.dependencies.io.grpc.internal.GrpcUtil.authorityFromHostAndPort(GrpcUtil.java:513)
	... 14 more

What shall I do?