【发布时间】：2019-12-25 10:25:51
【问题描述】：
在 Jean-Baptiste Onofré 的博客文章 Apache Karaf & Docker 中，他展示了如何在 Docker 容器中设置和运行 Apache Karaf。
我通过运行使用his build.sh script 创建了一个容器：
build.sh --from-release --karaf-version 4.2.7 --image-name karaf
然后，我在容器中运行 Karaf 控制台：
docker-compose run karaf
当我尝试启用 Web 控制台时，我得到：
__ __ ____
/ //_/____ __________ _/ __/
/ ,< / __ `/ ___/ __ `/ /_
/ /| |/ /_/ / / / /_/ / __/
/_/ |_|\__,_/_/ \__,_/_/
Apache Karaf (4.2.7)
Hit '<tab>' for a list of available commands
and '[cmd] --help' for help on a specific command.
Hit '<ctrl-d>' or type 'system:shutdown' or 'logout' to shutdown Karaf.
karaf@root()> feature:install webconsole
org.apache.karaf.features.internal.util.MultiException: Error:
Error downloading mvn:org.apache.karaf.webconsole/org.apache.karaf.webconsole.instance/4.2.7
at org.apache.karaf.features.internal.download.impl.MavenDownloadManager$MavenDownloader.<init>(MavenDownloadManager.java:91)
at org.apache.karaf.features.internal.download.impl.MavenDownloadManager.createDownloader(MavenDownloadManager.java:72)
at org.apache.karaf.features.internal.region.Subsystem.downloadBundles(Subsystem.java:457)
at org.apache.karaf.features.internal.region.Subsystem.downloadBundles(Subsystem.java:452)
at org.apache.karaf.features.internal.region.Subsystem.downloadBundles(Subsystem.java:452)
at org.apache.karaf.features.internal.region.SubsystemResolver.resolve(SubsystemResolver.java:224)
at org.apache.karaf.features.internal.service.Deployer.deploy(Deployer.java:393)
at org.apache.karaf.features.internal.service.FeaturesServiceImpl.doProvision(FeaturesServiceImpl.java:1062)
at org.apache.karaf.features.internal.service.FeaturesServiceImpl.lambda$doProvisionInThread$13(FeaturesServiceImpl.java:998)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Suppressed: java.io.IOException: Error downloading mvn:org.apache.karaf.webconsole/org.apache.karaf.webconsole.instance/4.2.7
at org.apache.karaf.features.internal.download.impl.AbstractRetryableDownloadTask.run(AbstractRetryableDownloadTask.java:77)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
... 3 more
Caused by: java.io.IOException: Error resolving artifact org.apache.karaf.webconsole:org.apache.karaf.webconsole.instance:jar:4.2.7: [Could not transfer artifact org.apache.karaf.webconsole:org.apache.karaf.webconsole.instance:jar:4.2.7 from/to central (http://repo1.maven.org/maven2/): repo1.maven.org]
at org.ops4j.pax.url.mvn.internal.AetherBasedResolver.configureIOException(AetherBasedResolver.java:803)
at org.ops4j.pax.url.mvn.internal.AetherBasedResolver.resolve(AetherBasedResolver.java:774)
at org.ops4j.pax.url.mvn.internal.AetherBasedResolver.resolve(AetherBasedResolver.java:657)
at org.ops4j.pax.url.mvn.internal.AetherBasedResolver.resolve(AetherBasedResolver.java:598)
at org.ops4j.pax.url.mvn.internal.AetherBasedResolver.resolve(AetherBasedResolver.java:565)
at org.apache.karaf.features.internal.download.impl.MavenDownloadTask.download(MavenDownloadTask.java:52)
at org.apache.karaf.features.internal.download.impl.AbstractRetryableDownloadTask.run(AbstractRetryableDownloadTask.java:60)
... 6 more
Suppressed: shaded.org.eclipse.aether.transfer.ArtifactTransferException: Could not transfer artifact org.apache.karaf.webconsole:org.apache.karaf.webconsole.instance:jar:4.2.7 from/to central (http://repo1.maven.org/maven2/): repo1.maven.org
at shaded.org.eclipse.aether.connector.basic.ArtifactTransportListener.transferFailed(ArtifactTransportListener.java:52)
at shaded.org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run(BasicRepositoryConnector.java:368)
at shaded.org.eclipse.aether.util.concurrency.RunnableErrorForwarder$1.run(RunnableErrorForwarder.java:75)
at shaded.org.eclipse.aether.connector.basic.BasicRepositoryConnector$DirectExecutor.execute(BasicRepositoryConnector.java:642)
at shaded.org.eclipse.aether.connector.basic.BasicRepositoryConnector.get(BasicRepositoryConnector.java:262)
at shaded.org.eclipse.aether.internal.impl.DefaultArtifactResolver.performDownloads(DefaultArtifactResolver.java:489)
at shaded.org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:390)
at shaded.org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:215)
at shaded.org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:192)
at shaded.org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:247)
at org.ops4j.pax.url.mvn.internal.AetherBasedResolver.resolve(AetherBasedResolver.java:767)
... 11 more
Caused by: shaded.org.apache.maven.wagon.TransferFailedException: repo1.maven.org
at shaded.org.apache.maven.wagon.shared.http.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:1184)
at shaded.org.apache.maven.wagon.shared.http.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:1072)
at shaded.org.apache.maven.wagon.StreamWagon.getInputStream(StreamWagon.java:126)
at shaded.org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:88)
at shaded.org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61)
at shaded.org.eclipse.aether.transport.wagon.WagonTransporter$GetTaskRunner.run(WagonTransporter.java:567)
at shaded.org.eclipse.aether.transport.wagon.WagonTransporter.execute(WagonTransporter.java:435)
at shaded.org.eclipse.aether.transport.wagon.WagonTransporter.get(WagonTransporter.java:412)
at shaded.org.eclipse.aether.connector.basic.BasicRepositoryConnector$GetTaskRunner.runTask(BasicRepositoryConnector.java:456)
at shaded.org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run(BasicRepositoryConnector.java:363)
... 20 more
Caused by: java.net.UnknownHostException: repo1.maven.org
at java.base/java.net.InetAddress$CachedAddresses.get(Unknown Source)
at java.base/java.net.InetAddress.getAllByName0(Unknown Source)
at java.base/java.net.InetAddress.getAllByName(Unknown Source)
at java.base/java.net.InetAddress.getAllByName(Unknown Source)
at shaded.org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
at shaded.org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:112)
at shaded.org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:373)
at shaded.org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:394)
at shaded.org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
at shaded.org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
at shaded.org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
at shaded.org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
at shaded.org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at shaded.org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.ops4j.pax.url.mvn.internal.wagon.ConfigurableHttpWagon.execute(ConfigurableHttpWagon.java:162)
at shaded.org.apache.maven.wagon.shared.http.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:1095)
... 29 more
Caused by: shaded.org.eclipse.aether.resolution.ArtifactResolutionException: Error resolving artifact org.apache.karaf.webconsole:org.apache.karaf.webconsole.instance:jar:4.2.7
at shaded.org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:413)
at shaded.org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:215)
at shaded.org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:192)
at shaded.org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:247)
at org.ops4j.pax.url.mvn.internal.AetherBasedResolver.resolve(AetherBasedResolver.java:767)
... 11 more
Error executing command: Error:
Error downloading mvn:org.apache.karaf.webconsole/org.apache.karaf.webconsole.instance/4.2.7
karaf@root()>
造成这种情况的根本原因似乎是：
Caused by: java.net.UnknownHostException: repo1.maven.org
有什么方法可以修改我的容器，使其在尝试访问外部 maven 存储库时不会引发此异常？
【问题讨论】：
标签： maven docker apache-karaf