[root@centos6.5i386 ~]#  # CentOS 6.x i386の場合
[root@centos6.5i386 ~]# rpm -ivh http://dl.iuscommunity.org/pub/ius/stable/CentOS/6/i386/ius-release-1.0-14.ius.centos6.noarch.rpm

[root@centos6.5x64 ~]# # CentOS 6.x x64の場合
[root@centos6.5x64 ~]# rpm -ivh http://dl.iuscommunity.org/pub/ius/stable/CentOS/6/x86_64/ius-release-1.0-14.ius.centos6.noarch.rpm
http://dl.iuscommunity.org/pub/ius/stable/CentOS/6/i386/ius-release-1.0-14.ius.centos6.noarch.rpm を取得中
警告: /var/tmp/rpm-tmp.99sX6T: ヘッダ V4 DSA/SHA1 Signature, key ID 9cd4953f: NOKEY
準備中...                ########################################### [100%]
   1:ius-release            ########################################### [100%]


[root@centos7.0x64 ~]# # CentOS 7.xの場合
[root@centos7.0x64 ~]# rpm -ivh http://dl.iuscommunity.org/pub/ius/stable/CentOS/7/x86_64/ius-release-1.0-13.ius.centos7.noarch.rpm
http://dl.iuscommunity.org/pub/ius/stable/CentOS/7/x86_64/ius-release-1.0-13.ius.centos7.noarch.rpm を取得中
警告: /var/tmp/rpm-tmp.wyO3Nq: ヘッダー V4 DSA/SHA1 Signature、鍵 ID 9cd4953f: NOKEY
準備しています...              ################################# [100%]
更新中 / インストール中...
   1:ius-release-1.0-13.ius.centos7   ################################# [100%]