CentOS-5（XenCenter6.5）的yum源无法使用解决办法

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1. [root@37wan ~]# yum -y install gcc
   
2. Loaded plugins: fastestmirror
   
3. Determining fastest mirrors
   
4. YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
   
5. Eg. Invalid release/
   
6. removing mirrorlist with no valid mirrors: /var/cache/yum/base/mirrorlist.txt
   
7. Error: Cannot find a valid baseurl for repo: base

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可以看出：URLs不是ftp或http地址，打开yum查看：

1. [base]
   
2. name=CentOS-$releasever - Base
   
3. mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
   
4. #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
   
5. gpgcheck=1
   
6. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

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1. [root@ yum.repos.d]# wget mirrorlist=http://mirrorlist.centos.org/6release=$releasever&arch=$basearch&repo=os  
   
2. [1] 4853  
   
3. [2] 4854  
   
4. [root@ yum.repos.d]# mirrorlist=http://mirrorlist.centos.org/6release=: Unsupported scheme.  

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即源的网址有问题。
更新文件内容，用以下内容替换：

1. # The mirror system uses the connecting IP address of the client and the  
   
2. # update status of each mirror to pick mirrors that are updated to and  
   
3. # geographically close to the client.  You should use this for CentOS updates  
   
4. # unless you are manually picking other mirrors.  
   
5. #  
   
6. # If the mirrorlist= does not work for you, as a fall back you can try the   
   
7. # remarked out baseurl= line instead.  
   
8. #  
   
9. #  
   
10. 
    
11. 
    
12. [base]  
    
13. name=CentOS-$releasever - Base  
    
14. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os  
    
15. #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/  
    
16. baseurl=http://vault.centos.org/5.11/os/$basearch/  
    
17. gpgcheck=1  
    
18. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5  
    
19. 
    
20. 
    
21. #released updates   
    
22. [updates]  
    
23. name=CentOS-$releasever - Updates  
    
24. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates  
    
25. #baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/  
    
26. baseurl=http://vault.centos.org/5.11/updates/$basearch/  
    
27. gpgcheck=1  
    
28. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5  
    
29. 
    
30. 
    
31. #additional packages that may be useful  
    
32. [extras]  
    
33. name=CentOS-$releasever - Extras  
    
34. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras  
    
35. #baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/  
    
36. baseurl=http://vault.centos.org/5.11/extras/$basearch/  
    
37. gpgcheck=1  
    
38. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5  
    
39. 
    
40. 
    
41. 
    
42. 
    
43. #additional packages that extend functionality of existing packages  
    
44. [centosplus]  
    
45. name=CentOS-$releasever - Plus  
    
46. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus  
    
47. #baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/  
    
48. baseurl=http://vault.centos.org/5.11/centosplus/$basearch/  
    
49. gpgcheck=1  
    
50. enabled=0  
    
51. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5  
    
52. 
    
53. 
    
54. 
    
55. 
    
56. #contrib - packages by Centos Users  
    
57. [contrib]  
    
58. name=CentOS-$releasever - Contrib  
    
59. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib  
    
60. #baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/  
    
61. baseurl=http://vault.centos.org/5.11/contrib/$basearch/  
    
62. gpgcheck=1  
    
63. enabled=0  
    
64. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

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最后再将/etc/yum.repos.d/Citrix.repo改名

1. mv Citrix.repo Citrix.repo_bak

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清空yum源缓存：

1. yum clean all #清空yum源缓存
   
2. yum makecache #从新加载新缓存

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通过yum list 测试yum是否可用

1. yum list

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用国内的yum源会出现一下问题，用上述解决办法，也ok，虽然会有一个连接报错

1. http://mirrors.aliyun.com/centos/5/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found

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用浏览器打开http://mirrors.aliyun.com/centos/5/os/x86_64/repodata/repomd.xml，根本找不到这个文件，163…阿里…也是，但是Centos6内有,说明国内也不支持Centos5了！