方法一、docker pull httpd
查找 Docker Hub 上的 httpd 镜像:

可以通过 Sort by 查看其他版本的 httpd,默认是最新版本 httpd:latest。
此外,我们还可以用 docker search httpd 命令来查看可用版本:
runoob@runoob:~/apache$ docker search httpd
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
httpd The Apache HTTP Server .. 524 [OK]
centos/httpd 7 [OK]
rgielen/httpd-image-php5 Docker image for Apache... 1 [OK]
microwebapps/httpd-frontend Httpd frontend allowing... 1 [OK]
lolhens/httpd Apache httpd 2 Server 1 [OK]
publici/httpd httpd:latest 0 [OK]
publicisworldwide/httpd The Apache httpd webser... 0 [OK]
rgielen/httpd-image-simple Docker image for simple... 0