请问阿里云默认centos7上怎么安装php啊？

我用以下命令安装，一直报错，请问如何解决？谢谢啦。

[root@ixxxx opt]# yum install php54 php54-mysql php54-common php54-gd php54-mbstring php54-mcrypt php54-devel
Loaded plugins: langpacks
Could not retrieve mirrorlist htt://mirrors.iuscommunity.org/mirrorlist?repo=ius-centos6&arch=x86_64&protocol=http error was
14: curl#7 - "Failed to connect to 2001:4802:7901:0:4ccc:ff11:0:4: Network is unreachable"




One of the configured repositories failed (Unknown),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:


     1. Contact the upstream for the repository and get them to fix the problem.


     2. Reconfigure the baseurl/etc. for the repository, to point to a working
        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).


     3. Disable the repository, so yum won't use it by default. Yum will then
        just ignore the repository until you permanently enable it again or use
        --enablerepo for temporary usage:


            yum-config-manager --disable <repoid>


     4. Configure the failing repository to be skipped, if it is unavailable.
        Note that yum will try to contact the repo. when it runs most commands,
        so will have to try and fail each time (and thus. yum will be be much
        slower). If it is a very temporary problem though, this is often a nice
        compromise:


            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true


Cannot find a valid baseurl for repo: ius/x86_64