Listing images on the host 列举主机上的镜像 🔗
- 查看当前所有镜像
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
ubuntu 14.04 1d073211c498 3 days ago 187.9 MB
busybox latest 2c5ac3f849df 5 days ago 1.113 MB
training/webapp latest 54bb4e8718e8 5 months ago 348.7 MB
- 使用镜像的不同
TAG，启动不同容器
docker run -t -i ubuntu:14.04 /bin/bash
docker run -t -i ubuntu:12.04 /bin/bash
docker run -t -i ubuntu /bin/bash
如果不使用TAG默认使用latest 如 ubuntu:latest
Getting a new image 从远程(镜像仓库)拉取新的镜像 🔗
$ docker pull centos
Using default tag: latest
Pulling repository centos
b7de3133ff98: Pulling dependent layers
5cc9e91966f7: Pulling fs layer
511136ea3c5a: Download complete
ef52fb1fe610: Download complete
. . .
Status: Downloaded newer image for centos
# 交互式启动容器
$ docker run -t -i centos /bin/bash
bash-4.1#
Finding images 查找镜像 🔗
-
web 查找 Docker Hub
-
命令查找
$ docker search sinatra
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
training/sinatra Sinatra training image 0 [OK]
marceldegraaf/sinatra Sinatra test app 0
mattwarren/docker-sinatra-demo 0 [OK]
luisbebop/docker-sinatra-hello-world 0 [OK]
bmorearty/handson-sinatra handson-ruby + Sinatra for Hands on with D... 0
subwiz/sinatra 0
bmorearty/sinatra 0
. . .
Pulling our image 从远程拉取镜像 🔗
$ docker pull training/sinatra
$ docker run -t -i training/sinatra /bin/bash
root@a8cb6ce02d85:/#
Creating our own images 创建镜像 🔗
- 从镜像启动一个容器修改容器，提交为另一个镜像
docker run -t -i training/sinatra /bin/bash
容器内命令
root@0b2616b0e5a8:/#
root@0b2616b0e5a8:/# apt-get install -y ruby2.0-dev
root@0b2616b0e5a8:/# gem2.0 install json
$ docker commit -m "Added json gem" -a "Kate Smith" \
0b2616b0e5a8 ouruser/sinatra:v2
- 查看结果
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
training/sinatra latest 5bc342fa0b91 10 hours ago 446.7 MB
ouruser/sinatra v2 3c59e02ddd1a 10 hours ago 446.7 MB
ouruser/sinatra latest 5db5f8471261 10 hours ago 446.7 MB
$ docker run -t -i ouruser/sinatra:v2 /bin/bash
root@78e82f680994:/#
- 用
Dockerfile构建镜像
mkdir sinatra
cd sinatra
touch Dockerfile
Dockerfile 文件内容
# This is a comment
FROM ubuntu:14.04
MAINTAINER Kate Smith <ksmith@example.com>
RUN apt-get update && apt-get install -y ruby ruby-dev
RUN gem install sinatra
Dockerfile 命令格式
INSTRUCTION statement
# 注释
从 Dockerfile 构建镜像
$ docker build -t ouruser/sinatra:v2 .
$ docker run -t -i ouruser/sinatra:v2 /bin/bash
root@8196968dac35:/#
Setting tags on an image 为镜像添加 TAG 🔗
$ docker tag 5db5f8471261 ouruser/sinatra:devel
$ docker images ouruser/sinatra
REPOSITORY TAG IMAGE ID CREATED SIZE
ouruser/sinatra latest 5db5f8471261 11 hours ago 446.7 MB
ouruser/sinatra devel 5db5f8471261 11 hours ago 446.7 MB
ouruser/sinatra v2 5db5f8471261 11 hours ago 446.7 MB
Image Digests 镜像摘要 🔗
$ docker images --digests | head
REPOSITORY TAG DIGEST IMAGE ID CREATED SIZE
ouruser/sinatra latest sha256:cbbf2f9a99b47fc460d422812b6a5adff7dfee951d8fa2e4a98caa0382cfbdbf 5db5f8471261 11 hours ago 446.7 MB
# 2.0 registry
$ docker pull ouruser/sinatra@sha256:cbbf2f9a99b47fc460d422812b6a5adff7dfee951d8fa2e4a98caa0382cfbdbf
Push an image to Docker Hub 推送到远程镜像仓库 🔗
$ docker push ouruser/sinatra
The push refers to a repository [ouruser/sinatra] (len: 1)
Sending image list
Pushing repository ouruser/sinatra (3 tags)
后续介绍推送到私有仓库
Remove an image from the host 删除本地镜像 🔗
需要没基于此镜像的容器才能删除
也可以加 -f 参数连同容器一起删除
$ docker rmi training/sinatra
Untagged: training/sinatra:latest
Deleted: 5bc342fa0b91cabf65246837015197eecfa24b2213ed6a51a8974ae250fedd8d
Deleted: ed0fffdcdae5eb2c3a55549857a8be7fc8bc4241fb19ad714364cbfd7a56b22f
Deleted: 5c58979d73ae448df5af1d8142436d81116187a7633082650549c52c3a2418f0
查看镜像依赖层级关系 🔗
docker inspect --format='{{.Id}} {{.Parent}}' $(docker images --filter since=f50f9524513f -q)
docker inspect --format='{{.Id}} {{.Parent}}' $(docker images --filter since=bf85b4b89889 -q)
docker inspect --format='{{.RepoDigests}} {{.Parent}}' $(docker images --filter since=bf85b4b89889 -q)
docker images --filter since=9c7cc63dd540
docker images --filter since=9c7cc63dd540 -q