要安装最新的64位MongoDB 2.6.0版，步骤如下：
1、创建mongodb.repo文件
在/etc/yum.repos.d/目录下创建文件mongodb.repo，它包含MongoDB仓库的配置信息，内容如下：
[mongodb]
name=MongoDB Repository
baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/x86_64/
gpgcheck=0
enabled=1
2、执行安装命令
$ sudo yum install mongodb-org
Loaded plugins: security
base | 3.7 kB 00:00
base/primary_db | 4.4 MB 00:01
extras | 3.4 kB 00:00
extras/primary_db | 19 kB 00:00
mongodb | 951 B 00:00
mongodb/primary | 24 kB 00:16
mongodb 155/155
openlogic | 1.3 kB 00:00
openlogic/primary | 273 kB 00:00
openlogic 24/24
updates | 3.4 kB 00:00
updates/primary_db | 2.6 MB 00:00
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package mongodb-org.x86_64 0:2.6.0-1 will be installed
--> Processing Dependency: mongodb-org-tools = 2.6.0 for package: mongodb-org-2.6.0-1.x86_64
--> Processing Dependency: mongodb-org-shell = 2.6.0 for package: mongodb-org-2.6.0-1.x86_64
--> Processing Dependency: mongodb-org-server = 2.6.0 for package: mongodb-org-2.6.0-1.x86_64
--> Processing Dependency: mongodb-org-mongos = 2.6.0 for package: mongodb-org-2.6.0-1.x86_64
--> Running transaction check
---> Package mongodb-org-mongos.x86_64 0:2.6.0-1 will be installed
---> Package mongodb-org-server.x86_64 0:2.6.0-1 will be installed
---> Package mongodb-org-shell.x86_64 0:2.6.0-1 will be installed
---> Package mongodb-org-tools.x86_64 0:2.6.0-1 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
============================================================================================
Package Arch Version Repository Size
============================================================================================
Installing:
mongodb-org x86_64 2.6.0-1 mongodb 4.6 k
Installing for dependencies:
mongodb-org-mongos x86_64 2.6.0-1 mongodb 6.8 M
mongodb-org-server x86_64 2.6.0-1 mongodb 8.9 M
mongodb-org-shell x86_64 2.6.0-1 mongodb 4.2 M
mongodb-org-tools x86_64 2.6.0-1 mongodb 88 M
Transaction Summary
============================================================================================
Install 5 Package(s)
Total download size: 108 M
Installed size: 274 M
Is this ok [y/N]: y