在Jenkins Docker代理中使用testcontainers：容器无法启动，NoRouteToHostException

Question

我正在使用Docker Agents的Jenkins声明式管道来构建和测试我的软件，包括使用测试容器运行集成测试。我可以在我的开发环境中运行测试容器测试（不使用Jenkins），但它们在Jenkins下会失败。

testcontainers Ryuk资源获取守护程序不工作

16:29:20.255 [testcontainers-ryuk] WARN  o.t.utility.ResourceReaper - Can not connect to Ryuk at 172.17.0.1:32769
java.net.NoRouteToHostException: No route to host (Host unreachable)
    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:403)
    at java.base/java.net.Socket.connect(Socket.java:591)
    at java.base/java.net.Socket.connect(Socket.java:540)
    at java.base/java.net.Socket.<init>(Socket.java:436)
    at java.base/java.net.Socket.<init>(Socket.java:213)
    at org.testcontainers.utility.ResourceReaper.lambda$start$1(ResourceReaper.java:112)
    at java.base/java.lang.Thread.run(Thread.java:834)

我可以通过将环境变量设置为true来禁用守护进程来解决这个问题。但是，一些集成测试仍然一再失败。

使用ElasticsearchContainer的集成测试反复失败：等待HTTP端口响应超时。

17:04:57.595 [main] INFO  d.e.c.7.1] - Starting container with ID: f5c653442103b9073c76f6ed91fc9117f7cb388d576606be8bd85bd9f3b2051d
17:04:58.465 [main] INFO  d.e.c.7.1] - Container docker.elastic.co/elasticsearch/elasticsearch:6.7.1 is starting: f5c653442103b9073c76f6ed91fc9117f7cb388d576606be8bd85bd9f3b2051d
17:04:58.479 [main] INFO  o.t.c.wait.strategy.HttpWaitStrategy - /loving_swartz: Waiting for 240 seconds for URL: http://172.17.0.1:32833/
17:08:58.480 [main] ERROR d.e.c.7.1] - Could not start container
org.testcontainers.containers.ContainerLaunchException: Timed out waiting for URL to be accessible (http://172.17.0.1:32833/ should return HTTP 200)
    at org.testcontainers.containers.wait.strategy.HttpWaitStrategy.waitUntilReady(HttpWaitStrategy.java:197)
    at org.testcontainers.containers.wait.strategy.AbstractWaitStrategy.waitUntilReady(AbstractWaitStrategy.java:35)
    at org.testcontainers.containers.GenericContainer.waitUntilContainerStarted(GenericContainer.java:582)
    at org.testcontainers.containers.GenericContainer.tryStart(GenericContainer.java:259)
    at org.testcontainers.containers.GenericContainer.lambda$doStart$0(GenericContainer.java:212)
    at org.rnorth.ducttape.unreliables.Unreliables.retryUntilSuccess(Unreliables.java:76)
    at org.testcontainers.containers.GenericContainer.doStart(GenericContainer.java:210)
    at org.testcontainers.containers.GenericContainer.start(GenericContainer.java:199)
    at
...
    at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)
17:08:58.513 [main] ERROR d.e.c.7.1] - Log output from the failed container:
OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.

OpenJDK 64-Bit Server VM warning: UseAVX=2 is not supported on this CPU, setting it to UseAVX=0

[2019-04-11T17:05:02,527][INFO ][o.e.e.NodeEnvironment    ] [1a_XhBT] using [1] data paths, mounts [[/ (rootfs)]], net usable_space [1.2tb], net total_space [1.2tb], types [rootfs]

[2019-04-11T17:05:02,532][INFO ][o.e.e.NodeEnvironment    ] [1a_XhBT] heap size [989.8mb], compressed ordinary object pointers [true]

[2019-04-11T17:05:02,536][INFO ][o.e.n.Node               ] [1a_XhBT] node name derived from node ID [1a_XhBTfQZWw1XLZMXrp4A]; set [node.name] to override

[2019-04-11T17:05:02,536][INFO ][o.e.n.Node               ] [1a_XhBT] version[6.7.1], pid[1], build[default/docker/2f32220/2019-04-02T15:59:27.961366Z], OS[Linux/3.10.0-957.10.1.el7.x86_64/amd64], JVM[Oracle Corporation/OpenJDK 64-Bit Server VM/12/12+33]

[2019-04-11T17:05:02,536][INFO ][o.e.n.Node               ] [1a_XhBT] JVM arguments [-Xms1g, -Xmx1g, -XX:+UseConcMarkSweepGC, -XX:CMSInitiatingOccupancyFraction=75, -XX:+UseCMSInitiatingOccupancyOnly, -Des.networkaddress.cache.ttl=60, -Des.networkaddress.cache.negative.ttl=10, -XX:+AlwaysPreTouch, -Xss1m, -Djava.awt.headless=true, -Dfile.encoding=UTF-8, -Djna.nosys=true, -XX:-OmitStackTraceInFastThrow, -Dio.netty.noUnsafe=true, -Dio.netty.noKeySetOptimization=true, -Dio.netty.recycler.maxCapacityPerThread=0, -Dlog4j.shutdownHookEnabled=false, -Dlog4j2.disable.jmx=true, -Djava.io.tmpdir=/tmp/elasticsearch-14081126934203442674, -XX:+HeapDumpOnOutOfMemoryError, -XX:HeapDumpPath=data, -XX:ErrorFile=logs/hs_err_pid%p.log, -Xlog:gc*,gc+age=trace,safepoint:file=logs/gc.log:utctime,pid,tags:filecount=32,filesize=64m, -Djava.locale.providers=COMPAT, -XX:UseAVX=2, -Des.cgroups.hierarchy.override=/, -Des.path.home=/usr/share/elasticsearch, -Des.path.conf=/usr/share/elasticsearch/config, -Des.distribution.flavor=default, -Des.distribution.type=docker]

...

[2019-04-11T17:05:16,338][INFO ][o.e.d.DiscoveryModule    ] [1a_XhBT] using discovery type [single-node] and host providers [settings]

[2019-04-11T17:05:17,795][INFO ][o.e.n.Node               ] [1a_XhBT] initialized

[2019-04-11T17:05:17,795][INFO ][o.e.n.Node               ] [1a_XhBT] starting ...

[2019-04-11T17:05:18,086][INFO ][o.e.t.TransportService   ] [1a_XhBT] publish_address {172.28.0.3:9300}, bound_addresses {0.0.0.0:9300}

[2019-04-11T17:05:18,128][WARN ][o.e.b.BootstrapChecks    ] [1a_XhBT] max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

[2019-04-11T17:05:18,299][INFO ][o.e.h.n.Netty4HttpServerTransport] [1a_XhBT] publish_address {172.28.0.3:9200}, bound_addresses {0.0.0.0:9200}

[2019-04-11T17:05:18,299][INFO ][o.e.n.Node               ] [1a_XhBT] started

[2019-04-11T17:05:18,461][WARN ][o.e.x.s.a.s.m.NativeRoleMappingStore] [1a_XhBT] Failed to clear cache for realms [[]]

[2019-04-11T17:05:18,542][INFO ][o.e.g.GatewayService     ] [1a_XhBT] recovered [0] indices into cluster_state

[2019-04-11T17:05:18,822][INFO ][o.e.c.m.MetaDataIndexTemplateService] [1a_XhBT] adding template [.watch-history-9] for index patterns [.watcher-history-9*]

[2019-04-11T17:05:18,871][INFO ][o.e.c.m.MetaDataIndexTemplateService] [1a_XhBT] adding template [.watches] for index patterns [.watches*]

[2019-04-11T17:05:18,906][INFO ][o.e.c.m.MetaDataIndexTemplateService] [1a_XhBT] adding template [.triggered_watches] for index patterns [.triggered_watches*]

[2019-04-11T17:05:18,955][INFO ][o.e.c.m.MetaDataIndexTemplateService] [1a_XhBT] adding template [.monitoring-logstash] for index patterns [.monitoring-logstash-6-*]

[2019-04-11T17:05:19,017][INFO ][o.e.c.m.MetaDataIndexTemplateService] [1a_XhBT] adding template [.monitoring-es] for index patterns [.monitoring-es-6-*]

[2019-04-11T17:05:19,054][INFO ][o.e.c.m.MetaDataIndexTemplateService] [1a_XhBT] adding template [.monitoring-alerts] for index patterns [.monitoring-alerts-6]

[2019-04-11T17:05:19,100][INFO ][o.e.c.m.MetaDataIndexTemplateService] [1a_XhBT] adding template [.monitoring-beats] for index patterns [.monitoring-beats-6-*]

[2019-04-11T17:05:19,148][INFO ][o.e.c.m.MetaDataIndexTemplateService] [1a_XhBT] adding template [.monitoring-kibana] for index patterns [.monitoring-kibana-6-*]

[2019-04-11T17:05:19,480][INFO ][o.e.l.LicenseService     ] [1a_XhBT] license [17853035-5cf6-49c8-96ca-4d14b26325f6] mode [basic] - valid

然而，Elasticsearch日志文件看起来还可以，它包含了Elasticsearch在启动期间写入的最后一条日志消息（关于许可证）。

手动更改该容器以使用HostPortWaitStrategy而不是默认的HttpWaitStrategy没有帮助。

在尝试调查或解决此问题时，我更改了测试代码以显式启动Docker网络，方法是为test容器Network对象调用network.getId（）。然后使用NoRouteToHostException失败。

如何修复此问题？

Answer 1

在我的例子中，为Docker代理选项添加两个参数就足够了：

• Docker插座作为卷

pipeline {
    agent any
    stages {
        stage('Gradle build') {
            agent {
                docker {
                    reuseNode true
                    image 'openjdk:11.0-jdk-slim'
                    args  '-v /var/run/docker.sock:/var/run/docker.sock --group-add 992'
                }
            }

            steps {
                sh 'env | sort'
                sh './gradlew build --no-daemon --stacktrace'
            }
        }
    } // stages
} // pipeline

Answer 2

经过一些实验，我发现了问题的原因。关键操作是尝试在Docker容器内创建Docker bridge网络（使用Docker network create或testcontainers网络对象），该容器本身在Docker bridge网络中运行。如果这样做，则不会从Docker收到错误消息，Docker守护程序日志文件也不会包含任何有用的消息。但尝试使用网络将导致“没有到主机的路由”。

通过让Jenkins为其Docker run（Docker运行）命令提供一个选项，我修复了这个问题，让我最外层的Docker容器（Jenkins代理）访问主机网络：

pipeline {
    agent {
        dockerfile {
            filename 'Dockerfile.jenkinsAgent'
            additionalBuildArgs  ...
            args '-v /var/run/docker.sock:/var/run/docker.sock ... --network="host" -u jenkins:docker'
       }
    }
    stages {
...

这是可以的，因为Jenkins代理不需要网桥网络提供的隔离级别。