centos 6.5 错误提示 No more mirrors to try. 如何解决

安装openstack最后到dashboard的时候报错：[Errno 256] No more mirrors to try.

很简单：

1.yum clean metadata

2.yum clean all

搞定！

至此，openstack也差不多一个个组件都正常了。接下来准备跑个vyos（电脑是真的有点hold不住）。

后面写个质量高一点的文章“How vRouter live in a cloud?”



YUM安装遭遇: [Errno 256] No more mirrors to try

把YUM配置好后，使用yum命令进行安装时，出现了如下错误：

Downloading Packages:
ftp://192.168.220.46/RHEL6.2/x64/Server/libaio-devel-0.3.107-10.el6.x86_64.rpm: [Errno 14] PYCURL ERROR 19 - "Given file does not exist"
Trying other mirror.


Error Downloading Packages:
  libaio-devel-0.3.107-10.el6.x86_64: failure: libaio-devel-0.3.107-10.el6.x86_64.rpm from RHEL6.2-Server-X64: [Errno 256] No more mirrors to try.

最开始以为是客户端的yum源配置缓存的问题，使用yum clean all命令清除后还是出现同样的错误。

最后竟然发现我的RHEL6.2操作系统原理没有默认安装ftp工具，坑爹啊！没办法只能从光盘再安装一下ftp工具：

[root@instsvr1 Packages]# rpm -ivh ftp-0.17-51.1.el6.x86_64.rpm
warning: ftp-0.17-51.1.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing...                ########################################### [100%]
   1:ftp                    ########################################### [100%]


顺便把telnet工具和服务也给装上了：

[root@instsvr1 Packages]# rpm -ivh telnet-*
warning: telnet-0.17-47.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing...                ########################################### [100%]
   1:telnet-server          ########################################### [ 50%]
   2:telnet                 ########################################### [100%]

安装了工具后结果还是报错，整了半天，才发现原来"Given file does not exist"信息是正确的，目录RHEL6.2/x64/Server下的确是没有libaio-devel-0.3.107-10.el6.x86_64.rpm这个文件，原来 在创建repodata时指定的是RPM包目录是RHEL6.2/x64/Packages，而yum工具会直接从RHEL6.2/x64/Server/目录下去寻找安装包，所以在RHEL6.2/x64/Server/目录下把Packages包下相应的文件link过来就可以了。

太粗心了！！！！！！！！




配置RHEL6.2的YUM源

服务器端：
1、    由于yum安装支持三种协议：file://、ftp://和http://，因此如果是使用本地文件作为源，则可直接使用file:\协议，否则需要先准备好ftp或者http服务。这次测试的是ftp源，因此需要配置好ftp服务，并且要把ftp服务配置为可匿名登录，并且要把rpm包都放在ftp匿名登录的root目录下面。Vsftp匿名登录的配置为：
anonymous_enable=YES
anon_root=/share（这个为vsftp匿名登录的root目录，并且其属性不能为/etc/vsftp/ftpusers，/etc/vsftp/user_list文件中所配置的用户，否则不能匿名登录）
如果不配置匿名登录或者匿名登录root目录设置不对会出现如下错误：
[root@srcbdc yum.repos.d]# yum list
Loaded plugins: aliases, rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
ftp://yumserver/RHEL/Server/repodata/repomd.xml: [Errno 4] IOError: [Errno ftp error] 550 Failed to change directory.
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: RHEL-Server. Please verify its path and try again
2、    先检查yum是否已安装，如果没有安装可以从光盘里面安装
[root@srcbdc ~]# rpm -qa|grep yum
yum-security-1.1.16-13.el5
yum-rhn-plugin-0.5.4-13.el5
yum-metadata-parser-1.1.2-3.el5
yum-updatesd-0.9-2.el5
yum-aliases-1.1.16-13.el5
yum-3.2.22-20.el5
3、    安装另一个用于yum的包createrepo
[root@srcbdc Server]# rpm -ivh createrepo-0.4.11-3.el5.noarch.rpm
warning: createrepo-0.4.11-3.el5.noarch.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
Preparing...                ########################################### [100%]
   1:createrepo             ########################################### [100%]
这个工具主要是用来生产yum所需要用到的安装包关系的数据库。
4、    把系统盘中的Server目录和VT目录拷贝到新的目录里面，我的是从ISO文件里面复制出来的
先挂载ISO文件
[root@srcbdc ~]# mount -o loop /instsvr/ISO/rhel-server-6.2-x86_64-dvd.iso /mnt
Copy文件
[root@srcbdc ~]# mkdir -p /instsvr/RHEL6.2/x64
[root@srcbdc ~]# cp -r /mnt/ /instsvr/RHEL6.2/x64
5、    创建rpm关系数据库
[root@srcbdc ~]# createrepo -g /instsvr/RHEL6.2/x64/Server/repodata/*comps-rhel6-Server.xml -o /instsvr/RHEL6.2/x64/Server -i /instsvr/RHEL6.2/x64/Server/listing /instsvr/RHEL6.2/x64/Packages/
[root@srcbdc ~]# createrepo -g /instsvr/RHEL6.2/x64/HighAvailability/repodata/*comps-rhel6-HighAvailability.xml -o /instsvr/RHEL6.2/x64/HighAvailability -i /instsvr/RHEL6.2/x64/HighAvailability/listing /instsvr/RHEL6.2/x64/Packages/
[root@srcbdc ~]# createrepo -g /instsvr/RHEL6.2/x64/LoadBalancer/repodata/*comps-rhel6-LoadBalancer.xml -o /instsvr/RHEL6.2/x64/LoadBalancer -i /instsvr/RHEL6.2/x64/LoadBalancer/listing /instsvr/RHEL6.2/x64/Packages/
[root@srcbdc ~]# createrepo -g /instsvr/RHEL6.2/x64/ResilientStorage/repodata/*comps-rhel6-ResilientStorage.xml -o /instsvr/RHEL6.2/x64/ResilientStorage -i /instsvr/RHEL6.2/x64/ResilientStorage/listing /instsvr/RHEL6.2/x64/Packages/
[root@srcbdc ~]# createrepo -g /instsvr/RHEL6.2/x64/ScalableFileSystem/repodata/*comps-rhel6-ScalableFileSystem.xml -o /instsvr/RHEL6.2/x64/ScalableFileSystem -i /instsvr/RHEL6.2/x64/ScalableFileSystem/listing /instsvr/RHEL6.2/x64/Packages/

创建rpm包的link文件：

[root@srcbdc ~]# cd /instsvr/RHEL6.2/x64/Server
[root@srcbdc ScalableFileSystem]# for i in `cat listing`; do ln -s ../Packages/$i $i; done
[root@srcbdc ~]# cd /instsvr/RHEL6.2/x64/HighAvailability
[root@srcbdc ScalableFileSystem]# for i in `cat listing`; do ln -s ../Packages/$i $i; done
[root@srcbdc ~]# cd /instsvr/RHEL6.2/x64/LoadBalancer
[root@srcbdc ScalableFileSystem]# for i in `cat listing`; do ln -s ../Packages/$i $i; done
[root@srcbdc ~]# cd /instsvr/RHEL6.2/x64/ResilientStorage
[root@srcbdc ScalableFileSystem]# for i in `cat listing`; do ln -s ../Packages/$i $i; done
[root@srcbdc ~]# cd /instsvr/RHEL6.2/x64/ScalableFileSystem
[root@srcbdc ScalableFileSystem]# for i in `cat listing`; do ln -s ../Packages/$i $i; done


6、    清除yum缓存信息
[root@srcbdc yum.repos.d]# yum clean all
Loaded plugins: aliases, rhnplugin, security
Cleaning up Everything
7、    再使用yum list名称查看rpm包，正常的话会列出所有的rpm包

客户端：

客户端就比较好配置了，只需要在/etc/yum.d.repo/目录小添加本地yum源配置文件即可

[root@instsvr1 yum.repos.d]# cat rhel6.2-x64.repo
[RHEL6.2-Server-X64]
name=Red Hat Enterprise Linux Install Server
baseurl=ftp://192.168.220.46/RHEL6.2/x64/Server
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-RedHat-release
[RHEL6.2-HighAvailability-X64]
name=Red Hat Enterprise Linux Install Server
baseurl=ftp://192.168.220.46/RHEL6.2/x64/HighAvailability/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[RHEL6.2-LoadBalancer-X64]
name=Red Hat Enterprise Linux Install Server
baseurl=ftp://192.168.220.46/RHEL6.2/x64/LoadBalancer/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[RHEL6.2-ResilientStorage-X64]
name=Red Hat Enterprise Linux Install Server
baseurl=ftp://192.168.220.46/RHEL6.2/x64/ResilientStorage/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[RHEL6.2-ScalableFileSystem-X64]
name=Red Hat Enterprise Linux Install Server
baseurl=ftp://192.168.220.46/RHEL6.2/x64/ScalableFileSystem/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[RHEL-RPMS]
name=Red Hat Enterprise Linux Install Server
baseurl=ftp://192.168.220.46/rpms
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release