https://docs.gitlab.com/omnibus/update/
https://about.gitlab.com/update/#centos-7
sudo yum install gitlab-ce ... gitlab preinstall: It seems you are upgrading from 10.x version series gitlab preinstall: to 11.x series. It is recommended to upgrade gitlab preinstall: to the last minor version in a major version series first before gitlab preinstall: jumping to the next major version. gitlab preinstall: Please follow the upgrade documentation at https://docs.gitlab.com/ee/policy/maintenance.html#upgrade-recommendations 失敗
→ マイナーバージョンを最新にする
sudo yum install gitlab-ce-10.8.7-ce.0.el7.x86_64
再度更新
sudo yum install gitlab-ce
