【gitlab安装问题集】yum安装报错"Couldn't resolve host 'mirror.centos.org'"

首先上报错信息：

Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package git.x86_64 0:1.7.1-3.el6_4.1 will be installed
--> Processing Dependency: perl-Git = 1.7.1-3.el6_4.1 for package: git-1.7.1-3.el6_4.1.x86_64
--> Processing Dependency: rsync for package: git-1.7.1-3.el6_4.1.x86_64
--> Processing Dependency: perl(Git) for package: git-1.7.1-3.el6_4.1.x86_64
--> Processing Dependency: perl(Error) for package: git-1.7.1-3.el6_4.1.x86_64
--> Processing Dependency: openssh-clients for package: git-1.7.1-3.el6_4.1.x86_64
--> Running transaction check
---> Package openssh-clients.x86_64 0:5.3p1-104.el6_6.1 will be installed
--> Processing Dependency: openssh = 5.3p1-104.el6_6.1 for package: openssh-clients-5.3p1-104.el6_6.1.x86_64
--> Processing Dependency: libedit.so.0()(64bit) for package: openssh-clients-5.3p1-104.el6_6.1.x86_64
---> Package perl-Error.noarch 1:0.17015-4.el6 will be installed
---> Package perl-Git.noarch 0:1.7.1-3.el6_4.1 will be installed
---> Package rsync.x86_64 0:3.0.6-12.el6 will be installed
--> Running transaction check
---> Package libedit.x86_64 0:2.11-4.20080712cvs.1.el6 will be installed
---> Package openssh.x86_64 0:5.3p1-94.el6 will be updated
--> Processing Dependency: openssh = 5.3p1-94.el6 for package: openssh-server-5.3p1-94.el6.x86_64
---> Package openssh.x86_64 0:5.3p1-104.el6_6.1 will be an update
--> Running transaction check
---> Package openssh-server.x86_64 0:5.3p1-94.el6 will be updated
---> Package openssh-server.x86_64 0:5.3p1-104.el6_6.1 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

===============================================================================================================================================================================================
 Package                                         Arch                                   Version                                                  Repository                               Size
===============================================================================================================================================================================================
Installing:
 git                                             x86_64                                 1.7.1-3.el6_4.1                                          base                                    4.6 M
Installing for dependencies:
 libedit                                         x86_64                                 2.11-4.20080712cvs.1.el6                                 base                                     74 k
 openssh-clients                                 x86_64                                 5.3p1-104.el6_6.1                                        updates                                 437 k
 perl-Error                                      noarch                                 1:0.17015-4.el6                                          base                                     29 k
 perl-Git                                        noarch                                 1.7.1-3.el6_4.1                                          base                                     28 k
 rsync                                           x86_64                                 3.0.6-12.el6                                             base                                    335 k
Updating for dependencies:
 openssh                                         x86_64                                 5.3p1-104.el6_6.1                                        updates                                 272 k
 openssh-server                                  x86_64                                 5.3p1-104.el6_6.1                                        updates                                 321 k

Transaction Summary
===============================================================================================================================================================================================
Install       6 Package(s)
Upgrade       2 Package(s)

Total download size: 6.1 M
Downloading Packages:
(1/8): git-1.7.1-3.el6_4.1.x86_64.rpm                                                                                                                                   | 4.6 MB     00:00     
(2/8): libedit-2.11-4.20080712cvs.1.el6.x86_64.rpm                                                                                                                      |  74 kB     00:00     
(3/8): openssh-5.3p1-104.el6_6.1.x86_64.rpm                                                                                                                             | 272 kB     00:00     
(4/8): openssh-clients-5.3p1-104.el6_6.1.x86_64.rpm                                                                                                                     | 437 kB     00:00     
(5/8): openssh-server-5.3p1-104.el6_6.1.x86_64.rpm                                                                                                                      | 321 kB     00:00     
(6/8): perl-Error-0.17015-4.el6.noarch.rpm                                                                                                                              |  29 kB     00:00     
(7/8): perl-Git-1.7.1-3.el6_4.1.noarch.rpm                                                                                                                              |  28 kB     00:00     
(8/8): rsync-3.0.6-12.el6.x86_64.rpm                                                                                                                                    | 335 kB     00:00     
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                                          4.0 MB/s | 6.1 MB     00:01     
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA256 Signature, key ID c105b9de: NOKEY
Retrieving key from http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6


GPG key retrieval failed: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror.centos.org'"

出现此问题在于： 虚拟机的DNS配置不对，需对/etc/resovl.conf文件进行修改！

修改前的DNS配置文件信息：

; generated by /sbin/dhclient-script
search localdomain
nameserver 192.168.31.1

修改后的DNS配置文件信息：

; generated by /sbin/dhclient-script
search localdomain
nameserver 192.168.31.1
nameserver 8.8.8.8

即在配置文件中增加了行nameserver 8.8.8.8