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

1.yum Installation Error

[root@iz25m0z7ik3z ~] #yum install MySQL

[root@iz25m0z7ik3z ~] #yum install MySQL Loaded plugins:security http://mirrors.aliyun.com/centos/6/os/x86_64/
Repodata/repomd.xml: [Errno] 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] 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] 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] 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] 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] 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] 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] Pycurl ERROR 6-"couldn ' t resolve
Host ' mirrors.aliyuncs.com ' trying other mirror.
 Setting up Install Process Package mysql-5.1.73-5.el6_6.x86_64 already installed and latest version

2. Modify DNS

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

Add at the end of the article

dns1=8.8.8.8
dns2=8.8.4.4

3. Restart Network Service

[root@iz25m0z7ik3z ~]# Service Network restart

Shutting down interface eth0:  Device state:3 (disconnected)
                                                           [  OK  ]
shutting down interface eth1:< c5/>[  OK  ]
shutting down loopback interface:                          [  OK  ]
fatal:module from not found.
Bringing up loopback interface:                            [  OK  ]
Bringing Up interface eth0:  Active connection state: Activated
Active connection path:/ORG/FREEDESKTOP/NETWORKMANAGER/ACTIVECONNECTION/2
                                                           [  OK  ]
Bringing Up interface eth1:  Rtnetlink Answers:file exists
rtnetlink answers:file exists
                                                           [  OK  ]
fatal:module off Found.

4. The following hint indicates that the network service conflicts with the NetworkManager service

Bringing up interface eth0:  active Connection state:activated
active connection path:/org/freedesktop/ NETWORKMANAGER/ACTIVECONNECTION/2
                                                           [  OK  ]

It should have been previously installed with the graphical interface "X Window System" caused.

5. Stop NetworkManager

[root@iz25m0z7ik3z ~]# service NetworkManager stop

Stopping NetworkManager daemon:                            [  OK  ]

6. Restart Network Service again

[root@iz25m0z7ik3z ~]# Service Network restart

Shutting down interface eth0:                              [  OK  ]
shutting down interface eth1:                              [  OK  ]
shutting Down loopback interface:                          [  OK  ]
fatal:module out 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 was already in use for dev Ice eth1
... Rtnetlink Answers:file exists
                                                           [  OK  ]
fatal:module off not found.

7. This warning is generally due to the NIC resolution ARP protocol, can be in the network card configuration file to add Arpcheck=no parameters to screen the check

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

Add at the end of the article

Arpcheck=no

Start the network card again

Shutting down interface eth0:                              [  OK  ]
shutting down interface eth1:                              [  OK  ]
shutting Down loopback interface:                          [  OK  ]
fatal:module out 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.

So yum update all normal.