rpmforgeが必要とのことでレポジトリを追加後，yum install memcached. # rpm -Uhv http://apt.sw.be/redhat/el5/en/x86_64/rpmforge/RPMS//rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm # vi /etc/yum.repos.d/rpmforge.repo ## enable = 1 in rpmforge-ext…