"Couldn't resolve host 'mirrors.aliyun.com'"

1.yum 安装出错

[root@iz25m0z7ik3z ~]#yum install mysql

[root@iZ25m0z7ik3Z ~]#yum install mysqlLoaded plugins: securityhttp://mirrors.aliyun.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.aliyun.com'"Trying other mirror.http://mirrors.aliyuncs.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.aliyuncs.com'"Trying other mirror.http://mirrors.aliyun.com/epel/6/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.aliyun.com'"Trying other mirror.http://mirrors.aliyuncs.com/epel/6/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.aliyuncs.com'"Trying other mirror.http://mirrors.aliyun.com/centos/6/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.aliyun.com'"Trying other mirror.http://mirrors.aliyuncs.com/centos/6/extras/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.aliyuncs.com'"Trying other mirror.http://mirrors.aliyun.com/centos/6/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.aliyun.com'"Trying other mirror.http://mirrors.aliyuncs.com/centos/6/updates/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.aliyuncs.com'"Trying other mirror.Setting up Install ProcessPackage mysql-5.1.73-5.el6_6.x86_64 already installed and latest versionNothing to do

2. 修改dns

[root@iz25m0z7ik3z ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0

文末添加

DNS1=8.8.8.8
DNS2=8.8.4.4

3. 重启network 服务

[root@iz25m0z7ik3z ~]# service network restart

Shutting down interface eth0:  Device state: 3 (disconnected)                                                           [  OK  ]Shutting down interface eth1:                              [  OK  ]Shutting down loopback interface:                          [  OK  ]FATAL: Module off not found.Bringing up loopback interface:                            [  OK  ]Bringing up interface eth0:  Active connection state: activatedActive connection path: /org/freedesktop/NetworkManager/ActiveConnection/2                                                           [  OK  ]Bringing up interface eth1:  RTNETLINK answers: File existsRTNETLINK answers: File exists                                                           [  OK  ]FATAL: Module off not found.

4. 如下提示表示network  服务 与 NetworkManager服务冲突

Bringing up interface eth0:  Active connection state: activatedActive connection path: /org/freedesktop/NetworkManager/ActiveConnection/2                                                           [  OK  ]

应该是之前安装了图形界面“X Window System”导致。

5. 停止NetworkManager

[root@iz25m0z7ik3z ~]#  service NetworkManager stop

Stopping NetworkManager daemon:                            [  OK  ]

6. 再次重启 network 服务

[root@iz25m0z7ik3z ~]#  service network restart

Shutting down interface eth0:                              [  OK  ]Shutting down interface eth1:                              [  OK  ]Shutting down loopback interface:                          [  OK  ]FATAL: Module off not found.Bringing up loopback interface:                            [  OK  ]Bringing up interface eth0:  Determining if ip address 10.44.153.37 is already in use for device eth0...                                                           [  OK  ]Bringing up interface eth1:  Determining if ip address 101.200.188.182 is already in use for device eth1...RTNETLINK answers: File exists                                                           [  OK  ]FATAL: Module off not found.

7. 该警告一般是由于网卡解析arp协议导致的，可在网卡的配置文件中加入ARPCHECK=NO参数来屏蔽该检查

[root@iz25m0z7ik3z ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0

文末添加

ARPCHECK=no

再次启动网卡

Shutting down interface eth0:                              [  OK  ]Shutting down interface eth1:                              [  OK  ]Shutting down loopback interface:                          [  OK  ]FATAL: Module off not found.Bringing up loopback interface:                            [  OK  ]Bringing up interface eth0:                                [  OK  ]Bringing up interface eth1:  RTNETLINK answers: File exists                                                           [  OK  ]FATAL: Module off not found.

至此yum update 一切正常。