查找镜像
我们可以从 Docker Hub 网站来搜索镜像，Docker Hub 网址为： https://hub.docker.com/
我们也可以使用 docker search 命令来搜索镜像。比如我们需要一个 httpd 的镜像来作为我们的 web 服务。我们可以通过 docker search 命令搜索 httpd 来寻找适合我们的镜像。
lusifer@UbuntuBase:~$ docker search ubuntu
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
ubuntu Ubuntu is a Debian-based Linux operating s... 6759 [OK]
dorowu/ubuntu-desktop-lxde-vnc Ubuntu with openssh-server and NoVNC 141 [OK]
rastasheep/ubuntu-sshd Dockerized SSH service, built on top of of... 114 [OK]
ansible/ubuntu14.04-ansible Ubuntu 14.04 LTS with ansible 88 [OK]
ubuntu-upstart Upstart is an event-based replacement for ... 80 [OK]
neurodebian NeuroDebian provides neuroscience research... 40 [OK]
ubuntu-debootstrap debootstrap --variant=minbase --components... 32 [OK]
nuagebec/ubuntu Simple always updated Ubuntu docker images... 22 [OK]
tutum/ubuntu Simple Ubuntu docker images with SSH access 19
1and1internet/ubuntu-16-nginx-php-phpmyadmin-mysql-5 ubuntu-16-nginx-php-phpmyadmin-mysql-5 17 [OK]
ppc64le/ubuntu Ubuntu is a Debian-based Linux operating s... 11
aarch64/ubuntu Ubuntu is a Debian-based Linux operating s... 9
i386/ubuntu Ubuntu is a Debian-based Linux operating s... 8
darksheer/ubuntu Base Ubuntu Image -- Updated hourly 3 [OK]
codenvy/ubuntu_jdk8 Ubuntu, JDK8, Maven 3, git, curl, nmap, mc... 3 [OK]
1and1internet/ubuntu-16-nginx-php-5.6-wordpress-4 ubuntu-16-nginx-php-5.6-wordpress-4 2 [OK]
1and1internet/ubuntu-16-apache-php-7.0 ubuntu-16-apache-php-7.0 1 [OK]
smartentry/ubuntu ubuntu with smartentry 0 [OK]
1and1internet/ubuntu-16-healthcheck ubuntu-16-healthcheck 0 [OK]
pivotaldata/ubuntu-gpdb-dev Ubuntu images for GPDB development 0
thatsamguy/ubuntu-build-image Docker webapp build images based on Ubuntu 0
ossobv/ubuntu Custom ubuntu image from scratch (based on... 0
1and1internet/ubuntu-16-sshd ubuntu-16-sshd 0 [OK]
pivotaldata/ubuntu A quick freshening-up of the base Ubuntu d... 0
defensative/socat-ubuntu 0 [OK]
说明：
- NAME：镜像仓库源的名称
- DESCRIPTION：镜像的描述
- OFFICIAL：是否docker官方发布