Centos:无法检索镜像列表

Question

我无法使用yum命令安装任何服务。当我尝试通过输入以下命令安装httpd时

[root@kstest /]# yum install httpd
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was
14: PYCURL ERROR 7 - "Failed to connect to 2a02:2498:1:3d:5054:ff:fed3:e91a: Network is unreachable"
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=extras error was
14: PYCURL ERROR 7 - "Failed to connect to 2a02:2498:1:3d:5054:ff:fed3:e91a: Network is unreachable"
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=updates error was
14: PYCURL ERROR 7 - "Failed to connect to 2a02:2498:1:3d:5054:ff:fed3:e91a: Network is unreachable"
 * base: centos.aol.in
 * extras: centos-hn.viettelidc.com.vn
 * updates: centos.aol.in
http://centos.aol.in/6.5/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://centos.aol.in/6.5/os/x86_64/repodata/repomd.xml: (28, 'connect() timed out!')
Trying other mirror.

之后，当我尝试使用yum命令时，它会显示

Existing lock /var/run/yum.pid: another copy is running as pid 2063.
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum
    Memory :  22 M RSS (219 MB VSZ)
    Started: Mon Jul 21 05:09:53 2014 - 01:09 ago
    State  : Traced/Stopped, pid: 2063

来解锁我输入的

ps aux | grep yum
kill -9 <pid number>

当我尝试通过输入以下命令来更新yum时

yum update -y

我得到了以下信息

[root@kstest etc]# yum update -y
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: centos.aol.in
 * extras: centos-hn.viettelidc.com.vn
 * updates: centos.aol.in
http://centos.aol.in/6.5/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://centos.aol.in/6.5/os/x86_64/repodata/repomd.xml: (28, 'connect() timed out!')
Trying other mirror.

如何解决此问题？如何安装httpd？

我的yum.repos.d文件在etc/中是空的。我的yum.conf文件是

[main]
proxy=http://proxy.com:8000
cachedir=/var/cache/yum/$basearch/$releasever
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
installonly_limit=5
bugtracker_url=http://bugs.centos.org/set_project.php?project_id=16&ref=http://bugs.centos.org/bug_report_page.php?category=yum
distroverpkg=centos-release

代理我已经添加了它。它以前就不在那里了。

Answer 1

我从6.4开始就遇到了同样的问题，我仍然对没有一个容易找到的解决方案感到震惊。快速的解决办法是注释掉所有的镜像列表行，并取消注释所有的baseurl行，但根据一些论坛中的一些人的说法，这并不是一件好事。

Answer 2

此问题可以通过修复您的网络设置来解决。IPv6镜像并不是在所有设置中都能工作。我使用Ansible做的事情是禁用IPv6，并使用谷歌的公共解析器。攻略假定SELinux已禁用。

---
- hosts: all
  user: vagrant
  sudo: True
  tasks:


  - name: "disable ipv6"
    shell: echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6

  - name: "disable ipv6"
    shell: echo 1 > /proc/sys/net/ipv6/conf/default/disable_ipv6

  - name: "restart network"
    service: name=network state=restarted

  - name: "add public resolver"
    lineinfile: dest=/etc/resolv.conf regexp='^nameserver' 
              line='nameserver 8.8.8.8' state=present

  - name: "clean yum"
    shell: yum clean all

  - name: "warmup Yum"
    shell: yum search libselinux-python

  - name: "use Yum"
    yum: name={{ item }} state=installed
    with_items: 
      - libselinux-python

  - name: "Enable SELinux"
    selinux: policy=targeted state=permissive

Answer 3

如果您在/etc/yum.conf，中定义了一个代理服务器，那么在使用yum时，所有用户都会使用这些详细信息连接到代理服务器。要启用所有yum操作以使用代理服务器，请在/etc/yum.conf中指定代理服务器详细信息。

在/etc/yum.conf中添加如下条目，以使yum能够使用代理(这里的代理服务器: abc.mydomain.com，连接到端口8080)

proxy=http://abc.mydomain.com:8080