怎么运行docker容器

蜗牛互联网技术资讯2021-12-134740

本篇内容介绍了“怎么运行docker容器”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

首先我们查看下当前本地docker镜像:

[root@xinsz10 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE

可以看到当前是没有任何镜像的,然后我们执行第二条命令,来拉取一个hello-world镜像

[root@xinsz10 ~]# docker pull hello-world
Using default tag: latest

#相当于给我们的helloworld后面加了一个:latest
latest: Pulling from library/hello-world

#正在拉取library下的一个hello-world
Digest: sha256:b2ba691d8aac9e5ac3644c0788e3d3823f9e97f757f01d2ddc6eb5458df9d801
Status: Image is up to date for hello-world:latest

查看是否下载完成也就是查看本地镜像

[root@xinsz10 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest 05a3bd381fc2 4 weeks ago 1.84kB

注: REPOSITORY 是镜像名

IMAGE ID 是64位的字符串,这里自动被截掉了,只显示了16位,可以唯一标识我们的镜像

CREATED 修改时间

SIZE 大小

镜像的名字在网站上都可以查到,docker 提供了一个镜像仓库,hub.docker.com 默认到这里下载

镜像下载完成后,我们来看看如何运行

具体命令: docker run +选项 IMAGE [:TAG] [命令] [ARG..]
[root@xinsz10 ~]# docker run hello-world
WARNING: IPv4 forwarding is disabled. Networking will not work.

Hello from Docker!
This message shows that your installation appears to be working correctly. #如果这个消息显示出来说明你的安装已经OK了

下面这些英文,是在告诉我们docker运行时经过了那几个步骤
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
https://cloud.docker.com/

For more examples and ideas, visit:
https://docs.docker.com/engine/userguide/
根据上面弹出的英文提示,(关于docker执行docker run时所做的那些操作)
我们用示意图来看看docker pull和docker run的整个流程: