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在centOS 7系统上搭建Mysql服务器时，报以下错误： Error downloading packages: vsftpd-3.0.2-22.el7.x86_64: [Errno 256] No more mirrors to try. [root@localhost ~]# 解决方式： 1、yum clean all 2、yum makecache [root@localhost ~]# yum clean all 已加载插件：fastestmirror 正在清理软件源： base extras updates Cleaning up everything [root@localhost ~]# yum makecache 已加载插件：fastestmirror base | 3.6 kB 00:00 extras | 3.4 kB 00:00 updates | 3.4 kB 00:00 (1/12): base/7/x86_64/group_gz | 166 kB 00:00 (2/12): extras/7/x86_64/filelists_db | 603 kB 00:02 (3/12): extras/7/x86_64/prestodelta | 100 kB 00:02 (4/12): extras/7/x86_64/primary_db | 205 kB 00:00 (5/12): extras/7/x86_64/other_db | 126 kB 00:00 (6/12): base/7/x86_64/filelists_db | 6.9 MB 00:07 (7/12): updates/7/x86_64/filelists_db | 3.4 MB 00:05 (8/12): updates/7/x86_64/other_db | 578 kB 00:02 (9/12): base/7/x86_64/primary_db | 5.9 MB 00:12 (10/12): updates/7/x86_64/primary_db | 6.0 MB 00:05 (11/12): base/7/x86_64/other_db | 2.5 MB 00:15 updates/7/x86_64/prestodelta FAILED http://mirrors.njupt.edu.cn/centos/7.5.1804/updates/x86_64/repodata/8ee07a5e1fde5231fed8ce55547405923af529a0902e57aeee1676035ae7a367-prestodelta.xml.gz: [Errno 12] Timeout on http://10.10.254.10/cache/2/02/mirrors.njupt.edu.cn/a8bc5955244fcfe9599025498ceada44/8ee07a5e1fde5231fed8ce55547405923af529a0902e57aeee1676035ae7a367-prestodelta.xml.gz: (28, 'Connection timed out after 31022 milliseconds') 正在尝试其它镜像。 (12/12): updates/7/x86_64/prestodelta | 679 kB 00:00 Determining fastest mirrors * base: mirrors.nwsuaf.edu.cn * extras: centos.ustc.edu.cn * updates: mirror.lzu.edu.cn 元数据缓存已建立 3.完了也可以再给yum来个升级【可选】。 yum -y update 然后重新安装就ok。