https://zhuanlan.zhihu.com/p/78471090
不停地换mirror,为了解决这个问题,在网上搜了好多资料,总结出一个基于aliyun的mirror源
先检查:是否能正常上网,DNS是否正常,网关gw是否正常,若通过ping 不正常,则解决好网络,再进行下面操作.
1. 清除缓存
[root@centos7 ~]# yum clean all 已加载插件：fastestmirror 正在清理软件源： base extras updates Cleaning up everything Maybe you want: rm -rf /var/cache/yum, to also free up space taken by orphaned data from disabled or removed repos Cleaning up list of fastest mirrors
2.元数据建立
[root@centos7 ~]# yum makecache 已加载插件：fastestmirror Determining fastest mirrors * base: mirrors.cn99.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com base | 3.6 kB 00:00:00 extras | 3.4 kB 00:00:00 updates | 3.4 kB 00:00:00 (1/12): base/7/x86_64/group_gz | 166 kB 00:00:01 (2/12): extras/7/x86_64/prestodelta | 100 kB 00:00:00 (3/12): extras/7/x86_64/filelists_db | 603 kB 00:00:02 (4/12): extras/7/x86_64/other_db | 126 kB 00:00:00 (5/12): extras/7/x86_64/primary_db | 205 kB 00:00:01 (6/12): base/7/x86_64/filelists_db | 6.9 MB 00:00:02 (7/12): base/7/x86_64/primary_db | 5.9 MB 00:00:03 (8/12): updates/7/x86_64/prestodelta | 679 kB 00:00:01 (9/12): updates/7/x86_64/other_db | 578 kB 00:00:01 (10/12): updates/7/x86_64/filelists_db | 3.4 MB 00:00:02 (11/12): updates/7/x86_64/primary_db | 6.0 MB 00:00:02 (12/12): base/7/x86_64/other_db | 2.5 MB 00:00:06 元数据缓存已建立
3. 更新
[root@centos7 ~]# yum update 已加载插件：fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.cn99.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com No packages marked for update
4.备份yum源
[root@centos7 ~]# cd /etc/yum.repos.d/ [root@centos7 yum.repos.d]# ls CentOS-Base.repo CentOS-Debuginfo.repo CentOS-Media.repo CentOS-Vault.repo CentOS-CR.repo CentOS-fasttrack.repo CentOS-Sources.repo [root@centos7 yum.repos.d]# mv CentOS-Base.repo CentOS-Base.repo.backup [root@centos7 yum.repos.d]# ls CentOS-Base.repo.backup CentOS-Debuginfo.repo CentOS-Media.repo CentOS-Vault.repo CentOS-CR.repo CentOS-fasttrack.repo CentOS-Sources.repo
5. 下载新的CentOS-Base.repo 到/etc/yum.repos.d/
再创建缓存
[root@centos7 yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo --2018-12-02 17:55:13-- http://mirrors.aliyun.com/repo/Centos-7.repo 正在解析主机 mirrors.aliyun.com (mirrors.aliyun.com)... 183.61.14.235, 183.61.14.231, 183.61.14.236, ... 正在连接 mirrors.aliyun.com (mirrors.aliyun.com)|183.61.14.235|:80... 已连接。 已发出 HTTP 请求，正在等待回应... 200 OK 长度：2523 (2.5K) [application/octet-stream] 正在保存至: “/etc/yum.repos.d/CentOS-Base.repo” 100%[===========================================================>] 2,523 --.-K/s 用时 0s 2018-12-02 17:55:18 (107 MB/s) - 已保存 “/etc/yum.repos.d/CentOS-Base.repo” [2523/2523])
[root@centos7 yum.repos.d]# yum makecache 已加载插件：fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.aliyun.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com http://mirrors.aliyuncs.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed connect to mirrors.aliyuncs.com:80; 拒绝连接" 正在尝试其它镜像。 http://mirrors.cloud.aliyuncs.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.cloud.aliyuncs.com; 未知的错误" 正在尝试其它镜像。 base | 3.6 kB 00:00:00 extras | 3.4 kB 00:00:00 updates | 3.4 kB 00:00:00 元数据缓存已建立