网站管理模块单独升级后，这个模块在也打不开了，重启服务器也没有用的
命令行下运行 yum makecache 看看有报错。 如果没有报错，运行命令：appnode ccenter restart重启下控制中心。
yum makecache
appnode ccenter restart
base | 3.6 kB 00:00:00 epel | 4.7 kB 00:00:00 extras | 3.4 kB 00:00:00 updates | 3.4 kB 00:00:00 (1/21): appnode-agent/x86_64/filelists_db | 162 kB 00:00:00 (2/21): appnode/x86_64/other_db | 1.0 MB 00:00:00 (3/21): appnode-ccenter/x86_64/other_db | 4.5 kB 00:00:00 (4/21): appnode-extras/x86_64/filelists_db | 13 kB 00:00:00 (5/21): appnode-extras/x86_64/other_db | 5.3 kB 00:00:00 (6/21): appnode/x86_64/filelists_db | 2.7 MB 00:00:00 (7/21): base/7/x86_64/filelists_db | 7.1 MB 00:00:01 (8/21): base/7/x86_64/other_db | 2.6 MB 00:00:01 epel/prestodelta FAILED =====================- ] 5.0 MB/s | 17 MB 00:00:04 ETA http://mirrors.pubyun.com/epel/7/x86_64/repodata/23001d47a406409e0c6fafddf3af6003a37b4fcf3b6ccee80fc1f646031ddfa6-prestodelta.xml.gz: [Errno 14] HTTP Error 404 - Not Found Trying other mirror. To address this issue please refer to the below knowledge base article https://access.redhat.com/articles/1320623 If above article doesn't help to resolve this issue please create a bug on https://bugs.centos.org/ (9/21): epel/updateinfo | 956 kB 00:00:00 epel/primary_db FAILED http://mirrors.pubyun.com/epel/7/x86_64/repodata/89884c18fe06cfcc73a503244ffceab9fb7e3c17cde6e45fb1b1448815df0fa4-primary.sqlite.bz2: [Errno 14] HTTP Error 404 - Not Found Trying other mirror. (10/21): extras/7/x86_64/filelists_db | 231 kB 00:00:00 (11/21): extras/7/x86_64/prestodelta | 47 kB 00:00:00 (12/21): extras/7/x86_64/other_db | 118 kB 00:00:00 (13/21): epel/other_db | 3.2 MB 00:00:00 (14/21): epel/filelists_db | 11 MB 00:00:02 (15/21): updates/7/x86_64/filelists_db | 1.9 MB 00:00:00 (16/21): epel/prestodelta | 4.6 kB 00:00:00 (17/21): updates/7/x86_64/other_db | 344 kB 00:00:00 (18/21): updates/7/x86_64/prestodelta | 343 kB 00:00:00 (19/21): epel/primary_db | 6.6 MB 00:00:00 (20/21): appnode-agent/x86_64/other_db | 16 kB 00:00:05 (21/21): appnode-ccenter/x86_64/filelists_db | 258 kB 00:00:05 Determining fastest mirrors * base: centos.ustc.edu.cn * epel: mirrors.sohu.com * extras: centos.ustc.edu.cn * updates: centos.ustc.edu.cn Metadata Cache Created
