在使用Docker时我想pull远端仓库的CentOS 6的镜像，我是这样操作的

docker search centos
返回的结果：

NAME DESCRIPTION STARS OFFICIAL AUTOMATED centos The official build of CentOS. 3160 [OK] jdeathe/centos-ssh CentOS-6 6.8 x86_64 / CentOS-7 7.3.1611 x8... 61 [OK] nimmis/java-centos This is docker images of CentOS 7 with dif... 23 [OK] consol/centos-xfce-vnc Centos container with "headless" VNC sessi... 22 [OK] gluster/gluster-centos Official GlusterFS Image [ CentOS-7 + Glu... 18 [OK] million12/centos-supervisor Base CentOS-7 with supervisord launcher, h... 13 [OK] torusware/speedus-centos Always updated official CentOS docker imag... 8 [OK] egyptianbman/docker-centos-nginx-php A simple and highly configurable docker co... 6 [OK] nathonfowlie/centos-jre Latest CentOS image with the JRE pre-insta... 5 [OK] centos/mariadb55-centos7 4 [OK] consol/sakuli-centos-xfce Sakuli JavaScript based end-2-end testing ... 3 [OK] harisekhon/centos-java Java on CentOS (OpenJDK, tags jre/jdk7-8) 2 [OK] harisekhon/centos-scala Scala + CentOS (OpenJDK tags 2.10-jre7 - 2... 2 [OK] centos/redis Redis built for CentOS 2 [OK] blacklabelops/centos CentOS Base Image! Built and Updates Daily! 1 [OK] darksheer/centos Base Centos Image -- Updated hourly 1 [OK] freenas/centos Simple CentOS Linux interactive container 1 [OK] timhughes/centos Centos with systemd installed and running 1 [OK] smartentry/centos centos with smartentry 0 [OK] januswel/centos yum update-ed CentOS image 0 [OK] termbox/centos CentOS 0 [OK] otagoweb/centos Apache (with PHP7), built on CentOS 7 0 [OK] repositoryjp/centos Docker Image for CentOS. 0 [OK] vcatechnology/centos A CentOS Image which is updated daily 0 [OK] labengine/centos Centos image base 0 [OK]

docker pull centos

然后下载下来的时最新的CentOS镜像，为版本7，我想下载版本为6的CentOS镜像，我在search的时候如何查看到tag，就以这里为例，我想下载官方的CentOS6的镜像，我想官方应该有提供CentOS6的镜像，我不知道怎么查看

提示：

{ dir } » docker search --help Usage: docker search [OPTIONS] TERM Search the Docker Hub for images Options: -f, --filter filter Filter output based on conditions provided --help Print usage --limit int Max number of search results (default 25) --no-trunc Don't truncate output

查看了docker search的选项，没有发现与tag相关的

这种问题大家是怎么解决的?