docker - Docker无法在Google Cloud Compute上解析DNS

Question

我已经在GCP Compute机器上设置了Docker 18.09.4。我使用的步骤来自官方Docker文档:https://docs.docker.com/install/linux/docker-ce/ubuntu/(我使用了可以选择安装特定版本的Docker的步骤)。

我想控制守护程序，因此我修改了/etc/docker/daemon.json使其具有以下内容:

{
    "debug": true,
    "dns": ["8.8.8.8", "8.8.4.4" ],
    "iptables": false
}

现在，我尝试了以下命令:

docker运行busybox nslookup google.com

docker run --dns 8.8.8.8 busybox nslookup google.com

他们两个都给我错误:

;; connection timed out; no servers could be reached

然后，我尝试使用以下命令启动一个新的nginx容器:

docker run --name nginx -d nginx

之后，我已连接到它:

docker exec -ti nginx /bin/sh

在容器内，我执行了以下命令，该命令给了我错误:

apt-get update
Err:1 http://deb.debian.org/debian buster InRelease                  
  Temporary failure resolving 'deb.debian.org'

来自 journalctl -fu docker的日志

1. docker run busybox nslookup google.com

Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.731158687Z" level=debug msg="Calling GET /_ping"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.732917319Z" level=debug msg="Calling POST /v1.39/containers/create"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.733295607Z" level=debug msg="form data: {\"AttachStderr\":true,\"AttachStdin\":false,\"AttachStdout\":true,\"Cmd\":[\"nslookup\",\"google.com\"],\"Domainname\":\"\",\"Entrypoint\":null,\"Env\":[],\"HostConfig\":{\"AutoRemove\":false,\"Binds\":null,\"BlkioDeviceReadBps\":null,\"BlkioDeviceReadIOps\":null,\"BlkioDeviceWriteBps\":null,\"BlkioDeviceWriteIOps\":null,\"BlkioWeight\":0,\"BlkioWeightDevice\":[],\"CapAdd\":null,\"CapDrop\":null,\"Cgroup\":\"\",\"CgroupParent\":\"\",\"ConsoleSize\":[0,0],\"ContainerIDFile\":\"\",\"CpuCount\":0,\"CpuPercent\":0,\"CpuPeriod\":0,\"CpuQuota\":0,\"CpuRealtimePeriod\":0,\"CpuRealtimeRuntime\":0,\"CpuShares\":0,\"CpusetCpus\":\"\",\"CpusetMems\":\"\",\"DeviceCgroupRules\":null,\"Devices\":[],\"DiskQuota\":0,\"Dns\":[],\"DnsOptions\":[],\"DnsSearch\":[],\"ExtraHosts\":null,\"GroupAdd\":null,\"IOMaximumBandwidth\":0,\"IOMaximumIOps\":0,\"IpcMode\":\"\",\"Isolation\":\"\",\"KernelMemory\":0,\"Links\":null,\"LogConfig\":{\"Config\":{},\"Type\":\"\"},\"MaskedPaths\":null,\"Memory\":0,\"MemoryReservation\":0,\"MemorySwap\":0,\"MemorySwappiness\":-1,\"NanoCpus\":0,\"NetworkMode\":\"default\",\"OomKillDisable\":false,\"OomScoreAdj\":0,\"PidMode\":\"\",\"PidsLimit\":0,\"PortBindings\":{},\"Privileged\":false,\"PublishAllPorts\":false,\"ReadonlyPaths\":null,\"ReadonlyRootfs\":false,\"RestartPolicy\":{\"MaximumRetryCount\":0,\"Name\":\"no\"},\"SecurityOpt\":null,\"ShmSize\":0,\"UTSMode\":\"\",\"Ulimits\":null,\"UsernsMode\":\"\",\"VolumeDriver\":\"\",\"VolumesFrom\":null},\"Hostname\":\"\",\"Image\":\"busybox\",\"Labels\":{},\"NetworkingConfig\":{\"EndpointsConfig\":{}},\"OnBuild\":null,\"OpenStdin\":false,\"StdinOnce\":false,\"Tty\":false,\"User\":\"\",\"Volumes\":{},\"WorkingDir\":\"\"}"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.798613784Z" level=debug msg="container mounted via layerStore: &{/var/lib/docker/overlay2/80485548dfcf34d534f6299414f5cf425af75eec3248c438a34902e6989e154b/merged 0x557e6de7b4a0 0x557e6de7b4a0}"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.839092703Z" level=debug msg="Calling POST /v1.39/containers/9a648ee0a53651276dd1ade67d8571ab2d9a0e050bceffcb1f65fd477b767151/attach?stderr=1&stdout=1&stream=1"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.839340015Z" level=debug msg="attach: stderr: begin"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.839353672Z" level=debug msg="attach: stdout: begin"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.839814620Z" level=debug msg="Calling POST /v1.39/containers/9a648ee0a53651276dd1ade67d8571ab2d9a0e050bceffcb1f65fd477b767151/wait?condition=next-exit"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.842434668Z" level=debug msg="Calling POST /v1.39/containers/9a648ee0a53651276dd1ade67d8571ab2d9a0e050bceffcb1f65fd477b767151/start"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.843777399Z" level=debug msg="container mounted via layerStore: &{/var/lib/docker/overlay2/80485548dfcf34d534f6299414f5cf425af75eec3248c438a34902e6989e154b/merged 0x557e6de7b4a0 0x557e6de7b4a0}"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.844336549Z" level=debug msg="Assigning addresses for endpoint stoic_saha's interface on network bridge"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.844563290Z" level=debug msg="RequestAddress(LocalDefault/172.17.0.0/16, <nil>, map[])"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.844618426Z" level=debug msg="Request address PoolID:172.17.0.0/16 App: ipam/default/data, ID: LocalDefault/172.17.0.0/16, DBIndex: 0x0, Bits: 65536, Unselected: 65532, Sequence: (0xe0000000, 1)->(0x0, 2046)->(0x1, 1)->end Curr:3 Serial:false PrefAddress:<nil> "
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.865286605Z" level=debug msg="Assigning addresses for endpoint stoic_saha's interface on network bridge"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.871127111Z" level=debug msg="Programming external connectivity on endpoint stoic_saha (74ce5214f6718a6acf89fa4e51049ded4afee75fbc8201fceed460a71a60cbfa)"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.872870334Z" level=debug msg="EnableService 9a648ee0a53651276dd1ade67d8571ab2d9a0e050bceffcb1f65fd477b767151 START"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.872898104Z" level=debug msg="EnableService 9a648ee0a53651276dd1ade67d8571ab2d9a0e050bceffcb1f65fd477b767151 DONE"
Sep 30 13:42:36 my-host dockerd[31794]: time="2019-09-30T13:42:36.877297601Z" level=debug msg="bundle dir created" bundle=/var/run/docker/containerd/9a648ee0a53651276dd1ade67d8571ab2d9a0e050bceffcb1f65fd477b767151 module=libcontainerd namespace=moby root=/var/lib/docker/overlay2/80485548dfcf34d534f6299414f5cf425af75eec3248c438a34902e6989e154b/merged
Sep 30 13:42:37 my-host dockerd[31794]: time="2019-09-30T13:42:37.200006747Z" level=debug msg="sandbox set key processing took 132.698845ms for container 9a648ee0a53651276dd1ade67d8571ab2d9a0e050bceffcb1f65fd477b767151"
Sep 30 13:42:37 my-host dockerd[31794]: time="2019-09-30T13:42:37.557948653Z" level=debug msg=event module=libcontainerd namespace=moby topic=/tasks/create
Sep 30 13:42:37 my-host dockerd[31794]: time="2019-09-30T13:42:37.603537357Z" level=debug msg=event module=libcontainerd namespace=moby topic=/tasks/start
Sep 30 13:42:47 my-host dockerd[31794]: time="2019-09-30T13:42:47.697939023Z" level=debug msg=event module=libcontainerd namespace=moby topic=/tasks/exit
Sep 30 13:42:47 my-host dockerd[31794]: time="2019-09-30T13:42:47.754722408Z" level=debug msg="attach: stdout: end"
Sep 30 13:42:47 my-host dockerd[31794]: time="2019-09-30T13:42:47.754721080Z" level=debug msg=event module=libcontainerd namespace=moby topic=/tasks/delete
Sep 30 13:42:47 my-host dockerd[31794]: time="2019-09-30T13:42:47.754788145Z" level=info msg="ignoring event" module=libcontainerd namespace=moby topic=/tasks/delete type="*events.TaskDelete"
Sep 30 13:42:47 my-host dockerd[31794]: time="2019-09-30T13:42:47.754744392Z" level=debug msg="attach: stderr: end"
Sep 30 13:42:47 my-host dockerd[31794]: time="2019-09-30T13:42:47.754822522Z" level=debug msg="attach done"
Sep 30 13:42:47 my-host dockerd[31794]: time="2019-09-30T13:42:47.755246346Z" level=debug msg="Revoking external connectivity on endpoint stoic_saha (74ce5214f6718a6acf89fa4e51049ded4afee75fbc8201fceed460a71a60cbfa)"
Sep 30 13:42:47 my-host dockerd[31794]: time="2019-09-30T13:42:47.756329538Z" level=debug msg="DeleteConntrackEntries purged ipv4:0, ipv6:0"
Sep 30 13:42:47 my-host dockerd[31794]: time="2019-09-30T13:42:47.858389201Z" level=debug msg="Releasing addresses for endpoint stoic_saha's interface on network bridge"
Sep 30 13:42:47 my-host dockerd[31794]: time="2019-09-30T13:42:47.858447908Z" level=debug msg="ReleaseAddress(LocalDefault/172.17.0.0/16, 172.17.0.3)"
Sep 30 13:42:47 my-host dockerd[31794]: time="2019-09-30T13:42:47.858487071Z" level=debug msg="Released address PoolID:LocalDefault/172.17.0.0/16, Address:172.17.0.3 Sequence:App: ipam/default/data, ID: LocalDefault/172.17.0.0/16, DBIndex: 0x0, Bits: 65536, Unselected: 65531, Sequence: (0xf0000000, 1)->(0x0, 2046)->(0x1, 1)->end Curr:4"

2. docker运行--dns 8.8.8.8 busybox nslookup google.com

Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.687551598Z" level=debug msg="Calling GET /_ping"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.689067144Z" level=debug msg="Calling POST /v1.39/containers/create"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.689449247Z" level=debug msg="form data: {\"AttachStderr\":true,\"AttachStdin\":false,\"AttachStdout\":true,\"Cmd\":[\"nslookup\",\"google.com\"],\"Domainname\":\"\",\"Entrypoint\":null,\"Env\":[],\"HostConfig\":{\"AutoRemove\":false,\"Binds\":null,\"BlkioDeviceReadBps\":null,\"BlkioDeviceReadIOps\":null,\"BlkioDeviceWriteBps\":null,\"BlkioDeviceWriteIOps\":null,\"BlkioWeight\":0,\"BlkioWeightDevice\":[],\"CapAdd\":null,\"CapDrop\":null,\"Cgroup\":\"\",\"CgroupParent\":\"\",\"ConsoleSize\":[0,0],\"ContainerIDFile\":\"\",\"CpuCount\":0,\"CpuPercent\":0,\"CpuPeriod\":0,\"CpuQuota\":0,\"CpuRealtimePeriod\":0,\"CpuRealtimeRuntime\":0,\"CpuShares\":0,\"CpusetCpus\":\"\",\"CpusetMems\":\"\",\"DeviceCgroupRules\":null,\"Devices\":[],\"DiskQuota\":0,\"Dns\":[\"8.8.8.8\"],\"DnsOptions\":[],\"DnsSearch\":[],\"ExtraHosts\":null,\"GroupAdd\":null,\"IOMaximumBandwidth\":0,\"IOMaximumIOps\":0,\"IpcMode\":\"\",\"Isolation\":\"\",\"KernelMemory\":0,\"Links\":null,\"LogConfig\":{\"Config\":{},\"Type\":\"\"},\"MaskedPaths\":null,\"Memory\":0,\"MemoryReservation\":0,\"MemorySwap\":0,\"MemorySwappiness\":-1,\"NanoCpus\":0,\"NetworkMode\":\"default\",\"OomKillDisable\":false,\"OomScoreAdj\":0,\"PidMode\":\"\",\"PidsLimit\":0,\"PortBindings\":{},\"Privileged\":false,\"PublishAllPorts\":false,\"ReadonlyPaths\":null,\"ReadonlyRootfs\":false,\"RestartPolicy\":{\"MaximumRetryCount\":0,\"Name\":\"no\"},\"SecurityOpt\":null,\"ShmSize\":0,\"UTSMode\":\"\",\"Ulimits\":null,\"UsernsMode\":\"\",\"VolumeDriver\":\"\",\"VolumesFrom\":null},\"Hostname\":\"\",\"Image\":\"busybox\",\"Labels\":{},\"NetworkingConfig\":{\"EndpointsConfig\":{}},\"OnBuild\":null,\"OpenStdin\":false,\"StdinOnce\":false,\"Tty\":false,\"User\":\"\",\"Volumes\":{},\"WorkingDir\":\"\"}"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.753539217Z" level=debug msg="container mounted via layerStore: &{/var/lib/docker/overlay2/7733a25fd22c0c446c3efc0d4a42c2b57a1b596777809070d85f0162aae28272/merged 0x557e6de7b4a0 0x557e6de7b4a0}"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.787264168Z" level=debug msg="Calling POST /v1.39/containers/02a8e8580e8b9c7a37af93a19195fb5e8725c545bae0e9d384119bf0811a4e32/attach?stderr=1&stdout=1&stream=1"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.787568195Z" level=debug msg="attach: stderr: begin"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.787571115Z" level=debug msg="attach: stdout: begin"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.788642046Z" level=debug msg="Calling POST /v1.39/containers/02a8e8580e8b9c7a37af93a19195fb5e8725c545bae0e9d384119bf0811a4e32/wait?condition=next-exit"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.790059040Z" level=debug msg="Calling POST /v1.39/containers/02a8e8580e8b9c7a37af93a19195fb5e8725c545bae0e9d384119bf0811a4e32/start"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.791398955Z" level=debug msg="container mounted via layerStore: &{/var/lib/docker/overlay2/7733a25fd22c0c446c3efc0d4a42c2b57a1b596777809070d85f0162aae28272/merged 0x557e6de7b4a0 0x557e6de7b4a0}"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.791909253Z" level=debug msg="Assigning addresses for endpoint wizardly_mirzakhani's interface on network bridge"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.791990693Z" level=debug msg="RequestAddress(LocalDefault/172.17.0.0/16, <nil>, map[])"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.792044255Z" level=debug msg="Request address PoolID:172.17.0.0/16 App: ipam/default/data, ID: LocalDefault/172.17.0.0/16, DBIndex: 0x0, Bits: 65536, Unselected: 65532, Sequence: (0xe0000000, 1)->(0x0, 2046)->(0x1, 1)->end Curr:4 Serial:false PrefAddress:<nil> "
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.802706733Z" level=debug msg="Assigning addresses for endpoint wizardly_mirzakhani's interface on network bridge"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.809600746Z" level=debug msg="Programming external connectivity on endpoint wizardly_mirzakhani (a2cbcc3a67d08696c136487ba80e40c688bd62ad99f6dffaba3a24fe050f835d)"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.811874045Z" level=debug msg="EnableService 02a8e8580e8b9c7a37af93a19195fb5e8725c545bae0e9d384119bf0811a4e32 START"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.811913727Z" level=debug msg="EnableService 02a8e8580e8b9c7a37af93a19195fb5e8725c545bae0e9d384119bf0811a4e32 DONE"
Sep 30 13:46:52 my-host dockerd[31794]: time="2019-09-30T13:46:52.818043209Z" level=debug msg="bundle dir created" bundle=/var/run/docker/containerd/02a8e8580e8b9c7a37af93a19195fb5e8725c545bae0e9d384119bf0811a4e32 module=libcontainerd namespace=moby root=/var/lib/docker/overlay2/7733a25fd22c0c446c3efc0d4a42c2b57a1b596777809070d85f0162aae28272/merged
Sep 30 13:46:53 my-host dockerd[31794]: time="2019-09-30T13:46:53.071556709Z" level=debug msg="sandbox set key processing took 102.179237ms for container 02a8e8580e8b9c7a37af93a19195fb5e8725c545bae0e9d384119bf0811a4e32"
Sep 30 13:46:53 my-host dockerd[31794]: time="2019-09-30T13:46:53.436036670Z" level=debug msg=event module=libcontainerd namespace=moby topic=/tasks/create
Sep 30 13:46:53 my-host dockerd[31794]: time="2019-09-30T13:46:53.482103873Z" level=debug msg=event module=libcontainerd namespace=moby topic=/tasks/start
Sep 30 13:46:58 my-host dockerd[31794]: time="2019-09-30T13:46:58.564159088Z" level=debug msg=event module=libcontainerd namespace=moby topic=/tasks/exit
Sep 30 13:46:58 my-host dockerd[31794]: time="2019-09-30T13:46:58.619382304Z" level=debug msg=event module=libcontainerd namespace=moby topic=/tasks/delete
Sep 30 13:46:58 my-host dockerd[31794]: time="2019-09-30T13:46:58.619428265Z" level=debug msg="attach: stdout: end"
Sep 30 13:46:58 my-host dockerd[31794]: time="2019-09-30T13:46:58.619432344Z" level=info msg="ignoring event" module=libcontainerd namespace=moby topic=/tasks/delete type="*events.TaskDelete"
Sep 30 13:46:58 my-host dockerd[31794]: time="2019-09-30T13:46:58.619436885Z" level=debug msg="attach: stderr: end"
Sep 30 13:46:58 my-host dockerd[31794]: time="2019-09-30T13:46:58.619478361Z" level=debug msg="attach done"
Sep 30 13:46:58 my-host dockerd[31794]: time="2019-09-30T13:46:58.620136579Z" level=debug msg="Revoking external connectivity on endpoint wizardly_mirzakhani (a2cbcc3a67d08696c136487ba80e40c688bd62ad99f6dffaba3a24fe050f835d)"
Sep 30 13:46:58 my-host dockerd[31794]: time="2019-09-30T13:46:58.621288893Z" level=debug msg="DeleteConntrackEntries purged ipv4:0, ipv6:0"
Sep 30 13:46:58 my-host dockerd[31794]: time="2019-09-30T13:46:58.714409171Z" level=debug msg="Releasing addresses for endpoint wizardly_mirzakhani's interface on network bridge"
Sep 30 13:46:58 my-host dockerd[31794]: time="2019-09-30T13:46:58.714475035Z" level=debug msg="ReleaseAddress(LocalDefault/172.17.0.0/16, 172.17.0.3)"
Sep 30 13:46:58 my-host dockerd[31794]: time="2019-09-30T13:46:58.714525792Z" level=debug msg="Released address PoolID:LocalDefault/172.17.0.0/16, Address:172.17.0.3 Sequence:App: ipam/default/data, ID: LocalDefault/172.17.0.0/16, DBIndex: 0x0, Bits: 65536, Unselected: 65531, Sequence: (0xf0000000, 1)->(0x0, 2046)->(0x1, 1)->end Curr:4"

问题是什么？

Answer 1

我在Ubuntu 18.04上的GCP上复制了您的问题，发现您遵循的Docker文档基于Ubuntu，并且可以使其工作:

在GCP上安装实例

在GCP控制台中，我创建了一个带有“Ubuntu 18.04”镜像的实例。您可以在“启动磁盘”类别下指定镜像。默认情况下，所选图像将为Debian 9，请确保对其进行更改。您可以将所有其他设置保留为默认设置。

创建实例，并通过SSH进入实例。

在Ubuntu 18.04上的Docker安装

现在，在安装Docker时，我遵循了您提供的相同文档:
https://docs.docker.com/install/linux/docker-ce/ubuntu

设置存储库。确保安装指南中指示的所有必需软件包。您可以使用以下命令验证是否已全部安装:

    $ dpkg -l apt-transport-https ca-certificates curl gnupg-agent software-properties-common

如上所述添加Docker的官方GPG。

    $ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

不要忘记添加存储库:

    sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

现在安装版本5:18.09.4:

    $ sudo apt-get update
    $ sudo apt-get install docker-ce=5:18.09.4~3-0~ubuntu-bionic docker-ce-cli=5:18.09.4~3-0~ubuntu-bionic containerd.io

验证它是否有效:

    $ sudo docker run hello-world

使用Busybox的Docker内部的DNS解析

我试图复制您的相同错误，但收到“No answer”错误:

    $ sudo docker run --dns 8.8.8.8 busybox nslookup google.com
    Server:         8.8.8.8
    Address:        8.8.8.8:53

    Non-authoritative answer:
    Name:   google.com
    Address: 216.58.206.14

    *** Can't find google.com: No answer

键入“ busybox ”会使用可用图像的最新版本。相反，我尝试使用其他版本，但效果很好:

    $ sudo docker run busybox:glibc nslookup google.com
    Server:         169.254.169.254
    Address:        169.254.169.254:53

    Non-authoritative answer:
    Name:   google.com
    Address: 216.58.208.46

    Non-authoritative answer:
    Name:   google.com
    Address: 2a00:1450:4001:81d::200e

    $ sudo docker run --dns 8.8.8.8 busybox:glibc nslookup google.com
    Server:         8.8.8.8
    Address:        8.8.8.8:53

    Non-authoritative answer:
    Name:   google.com
    Address: 172.217.16.174

    Non-authoritative answer:
    Name:   google.com
    Address: 2a00:1450:4001:821::200e

因此，我认为我们可以确认这是镜像版本的问题。您可以在以下链接上找到有关图像的更多信息:
https://hub.docker.com/_/busybox?tab=description

希望这解决了您的一些疑问。

亲切的问候，