经过测试的基础架构
| 平台 | 实例数 | 阅读时间 |
|---|---|---|
| Play with Docker | 1 | 5 分钟 |
先决条件
运行Hello World示例
$ docker run hello-world
解释
此图像是有效使用划痕图像的典型示例。请参阅 https://github.com/docker-library/hello-world 中的 hello.c，了解此图像中包含的 hello 二进制文件的源代码。
那么这里发生了什么呢？我们调用了 docker 运行命令，该命令负责启动容器。
参数 hello-world 是某人在 dockerhub 上为我们创建的图像的名称。它将首先在本地搜索“你好世界”图像，然后在Dockerhub中搜索。
下载映像后，Docker 会将映像转换为正在运行的容器并执行它。
您知道吗？
- Hello World Docker映像的大小仅为 1.84 KB。
[node1] (local) root@192.168.0.18 ~ $ docker images REPOSITORY TAG IMAGE ID CREATED SIZE hello-world latest 4ab4c602aa5e 6 weeks ago 1.84kB
- 运行命令时，它不显示任何正在运行的容器。原因 – 它被执行一次并立即退出。
docker ps
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS
PORTS NAMES
- 您可以使用命令来检查此特定 Docker 映像。
docker inspect <imagename>
$ docker inspect 4ab
[
{
"Id": "sha256:4ab4c602aa5eed5528a6620ff18a1dc4faef0e1ab3a5eddeddb410714478c67f",
"RepoTags": [
"hello-world:latest"
],
"RepoDigests": [
"hello-world@sha256:0add3ace90ecb4adbf7777e9aacf18357296e799f81cabc9fde470971e499788"
],
"Parent": "",
"Comment": "",
"Created": "2018-09-07T19:25:39.809797627Z",
"Container": "15c5544a385127276a51553acb81ed24a9429f9f61d6844db1fa34f46348e420",
"ContainerConfig": {
"Hostname": "15c5544a3851",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": [
"/bin/sh",
"-c",
"#(nop) ",
"CMD [\"/hello\"]"
],
"ArgsEscaped": true,
"Image": "sha256:9a5813f1116c2426ead0a44bbec252bfc5c3d445402cc1442ce9194fc1397027",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {}
},
"DockerVersion": "17.06.2-ce",
"Author": "",
"Config": {
"Hostname": "",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": [
"/hello"
],
"ArgsEscaped": true,
"Image": "sha256:9a5813f1116c2426ead0a44bbec252bfc5c3d445402cc1442ce9194fc1397027",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": null
},
"Architecture": "amd64",
"Os": "linux",
"Size": 1840,
"VirtualSize": 1840,
"GraphDriver": {
"Data": {
"MergedDir": "/var/lib/docker/overlay2/e494ae30abc49ad403ef5c2a32bcb894629ea4da6d4d226fbca70d27ed9a74d8/merged",
"UpperDir": "/var/lib/docker/overlay2/e494ae30abc49ad403ef5c2a32bcb894629ea4da6d4d226fbca70d27ed9a74d8/diff",
"WorkDir": "/var/lib/docker/overlay2/e494ae30abc49ad403ef5c2a32bcb894629ea4da6d4d226fbca70d27ed9a74d8/work"
},
"Name": "overlay2"
},
"RootFS": {
"Type": "layers",
"Layers": [
"sha256:428c97da766c4c13b19088a471de6b622b038f3ae8efa10ec5a37d6d31a2df0b"
]
},
"Metadata": {
"LastTagTime": "0001-01-01T00:00:00Z"
}
}
]
