Docker Technologies for DevOps and Developers学习笔记 - 1

📅 发布于：2018年05月19日🏷️ 标签：Docker

Concepts

Images

• which are read only templates used to create containers.
• are created with the docker build command by docker user.

Containers

• container is an instance of an image(like an instance of a class - a runtime object)

Official Docker images website ->[https://hub.docker.com/]

Basic commands

ls本机上的docker image ->docker images

创建一个有busybox的的docker container 并执行echo "hello docker"->docker run busybox:1.24 echo "hello docker"

ls docker container中的根目录 ->docker run busybox:1.24 ls /

进入docker container ->docker run -i -t busybox:1.24，执行exit可退出container，每一次都是一个新的image

使用docker ps -a来查看创建过的历史container ->

rx:dev reed$ docker ps -a
CONTAINER ID        IMAGE               COMMAND                 CREATED             STATUS                         PORTS               NAMES
d46a47c46f34        busybox:1.24"sleep 1000"3 minutes ago       Up 3 minutes                                       wonderful_shockley
180a27bc3ba4        busybox:1.24"sh"4 minutes ago       Exited (0) 4 minutes ago                           nostalgic_ritchie
901dec3242bb        busybox:1.24"ls /"26 minutes ago      Exited (0) 26 minutes ago                          pensive_keldysh

```bash

新建一个container执行命令，完成后自动删除这个container ->`docker run --rm busybox:1.24 sleep 1`

新建一个指定名字的docker container ->`run --name my_docker_container busybox:1.24 ls`

inspect一个container的底层信息 ->

```text
rx:dev reed$ docker run -d busybox:1.24 sleep 100
7dd3d07d1ae16e0ccd042c62cc08a2523dc3dbf325ea9f957ff49fcf1e414645
rx:dev reed$ docker inspect 7dd3d07d1ae16e0ccd042c62cc08a2523dc3dbf325ea9f957ff49fcf1e414645

```bash

拉取tomcat 8.0 image，并创建一个container，同时将container的8080端口映射到主机的8888端口 ->

- 从国内docker image源中下载tomcat 8.0 image ->`docker pull registry.docker-cn.com/library/tomcat:8.0`
- 创建container并映射端口 ->`docker run -it -p 8888:8080 registry.docker-cn.com/library/tomcat:8.0`
- 运行container并在后台运行 ->`docker run -it -d -p 8888:8080 registry.docker-cn.com/library/tomcat:8.0`执行后会显示container ID
- 查看后台运行的container的运行log ->`docker logs DOCKER_CONTAINER_ID`
- 停止一个后台运行的container ->`docker stop DOCKER_CONTAINER_NAME`

## Run Container in Foreground or Background

run container in foreground -> default mode

run container in background ->`-d`(dispatch) option

建一个container在后台运行，并用`ps`查看运行中的container ->

```text
rx:dev reed$ docker run -d busybox:1.24 sleep 1000
d46a47c46f34cbec69dc6ce04e9674a74f81d5bea17b93a8d441c4a88c8ba056
rx:dev reed$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
d46a47c46f34        busybox:1.24"sleep 1000"1 second ago        Up 2 seconds                            wonderful_shockley