SolrTest failure when using CloundContainer

[ffang]

This probably only is the problem on non-linux machines.
I got test failures on my Mac when using CloundContainer(SSLContainer and StandaloneContainer are good though)
the error is like

Caused by: org.apache.solr.client.solrj.SolrServerException: IOException occurred when talking to server at: http://172.30.0.4:8983/solr/collection1
	at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:695)
	at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:266)
	at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:248)
	at org.apache.solr.client.solrj.impl.LBSolrClient.doRequest(LBSolrClient.java:369)
	at org.apache.solr.client.solrj.impl.LBSolrClient.request(LBSolrClient.java:297)
	at org.apache.solr.client.solrj.impl.BaseCloudSolrClient.sendRequest(BaseCloudSolrClient.java:1171)
	at org.apache.solr.client.solrj.impl.BaseCloudSolrClient.requestWithRetryOnStaleState(BaseCloudSolrClient.java:934)
	at org.apache.solr.client.solrj.impl.BaseCloudSolrClient.request(BaseCloudSolrClient.java:866)
	at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:214)
	at org.apache.camel.component.solr.SolrProducer.insert(SolrProducer.java:257)
	at org.apache.camel.component.solr.SolrProducer.process(SolrProducer.java:85)
	at org.apache.camel.support.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:66)
	at org.apache.camel.impl.engine.SharedCamelInternalProcessor.process(SharedCamelInternalProcessor.java:217)
	at org.apache.camel.impl.engine.SharedCamelInternalProcessor$1.process(SharedCamelInternalProcessor.java:111)
	at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83)
	at org.apache.camel.impl.engine.SharedCamelInternalProcessor.process(SharedCamelInternalProcessor.java:108)
	at org.apache.camel.support.cache.DefaultProducerCache.send(DefaultProducerCache.java:190)
	at org.apache.camel.impl.engine.DefaultProducerTemplate.send(DefaultProducerTemplate.java:176)
	at org.apache.camel.impl.engine.DefaultProducerTemplate.send(DefaultProducerTemplate.java:172)
	at org.apache.camel.impl.engine.DefaultProducerTemplate.send(DefaultProducerTemplate.java:153)
	at org.apache.camel.impl.engine.DefaultProducerTemplate.sendBodyAndHeader(DefaultProducerTemplate.java:219)
	... 34 more
Caused by: org.apache.http.conn.ConnectTimeoutException: Connect to 172.30.0.4:8983 [/172.30.0.4] failed: connect timed out
	at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:151)
	at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:376)
	at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:393)
	at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
	at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)
	at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
	at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
	at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
	at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:571)
	... 54 more
Caused by: java.net.SocketTimeoutException: connect timed out
	at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)
	at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)
	at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)
	at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.base/java.net.Socket.connect(Socket.java:609)
	at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:75)
	at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
	... 64 more

Notice that 172.30.0.4 is the virtual docker node ip, but on non-linux machines with Docker Desktop, we can't access the virtual docker node ip.

This 172.30.0.4 was passed in org.apache.solr.client.solrj.impl.BaseCloudSolrClient by

sortedReplicas.forEach( replica -> {
        if (seenNodes.add(replica.getNodeName())) {
          theUrlList.add(ZkCoreNodeProps.getCoreUrl(replica.getBaseUrl(), joinedInputCollections));
        }
      });

So if we can find a way(like in cloud-docker-compose.yml configuration) to pass in the well-known hostname "host.docker.internal" on Docker Desktop as the replica nodename, we should be able to make it work.

[ffang]

Eventually I find a way to fix this. And this discussion docker-solr/docker-solr-examples#5 inspired