版本：4.0.0-rc
操作系统：CentOS Linux release 7.4.1708 (Core) x86_64
机器分派：
[tidb_servers]
10.189.66.17
[tikv_servers]
10.189.66.18
10.189.66.19
10.189.66.36
[pd_servers]
10.189.66.18
[spark_master]
[spark_slaves]
[lightning_server]
[importer_server]
[monitoring_servers]
10.189.66.17
[grafana_servers]
10.189.66.17
[monitored_servers]
10.189.66.17
10.189.66.18
10.189.66.19
10.189.66.36
执行环境准备命令时：ansible-playbook bootstrap.yml
报如下错误：
TASK [check_system_static : Get systemd version] ***************************************************************************************************** fatal: [10.189.66.17]: FAILED! => changed=false msg: |- Error from repoquery: [’/usr/bin/repoquery’, ‘–show-duplicates’, ‘–plugins’, ‘–quiet’, ‘–disablerepo’, ‘’, ‘–enablerepo’, ‘’, ‘–qf’, ‘%{name}|%{epoch}|%{version}|%{release}|%{arch}|%{repoid}’, ‘systemd’]: Could not match packages: Cannot find a valid baseurl for repo: base/7/x86_64 fatal: [10.189.66.36]: FAILED! => changed=false msg: |- Error from repoquery: [’/usr/bin/repoquery’, ‘–show-duplicates’, ‘–plugins’, ‘–quiet’, ‘–disablerepo’, ‘’, ‘–enablerepo’, ‘’, ‘–qf’, ‘%{name}|%{epoch}|%{version}|%{release}|%{arch}|%{repoid}’, ‘systemd’]: Could not match packages: Cannot find a valid baseurl for repo: base/7/x86_64 fatal: [10.189.66.18]: FAILED! => changed=false msg: |- Error from repoquery: [’/usr/bin/repoquery’, ‘–show-duplicates’, ‘–plugins’, ‘–quiet’, ‘–disablerepo’, ‘’, ‘–enablerepo’, ‘’, ‘–qf’, ‘%{name}|%{epoch}|%{version}|%{release}|%{arch}|%{repoid}’, ‘systemd’]: Could not match packages: Cannot find a valid baseurl for repo: base/7/x86_64 fatal: [10.189.66.19]: FAILED! => changed=false msg: |- Error from repoquery: [’/usr/bin/repoquery’, ‘–show-duplicates’, ‘–plugins’, ‘–quiet’, ‘–disablerepo’, ‘’, ‘–enablerepo’, ‘’, ‘–qf’, ‘%{name}|%{epoch}|%{version}|%{release}|%{arch}|%{repoid}’, ‘systemd’]: Could not match packages: Cannot find a valid baseurl for repo: base/7/x86_64