安装Mongo db 4 CentOS 6.1失败

Question

我正在运行CentOS 6.1-

# lsb_release -d  
Description:    CentOS release 6.10 (Final)

发行版是6-

# python -c 'import yum, pprint; yb = yum.YumBase(); pprint.pprint(yb.conf.yumvar, width=1)'
Loaded plugins: fastestmirror
{'arch': 'ia32e',
 'basearch': 'x86_64',
 'infra': 'stock',
 'releasever': '6',
 'uuid': 'af2ec701-1921-42b0-95b1-4ec3ba0f92b7'}

回忆录-

# cat /etc/yum.repos.d/mongodb-org-4.0.repo
[mongodb-org-4.0]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.0/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.0.asc

运行更新

yum  update
Loaded plugins: fastestmirror
Setting up Update Process
Loading mirror speeds from cached hostfile
 * base: ftp.cvut.cz
 * epel: mirrors.nic.cz
 * extras: ftp.cvut.cz
 * updates: ftp.cvut.cz
No Packages marked for Update

我从https://docs.mongodb.com/manual/tutorial/install-mongodb-on-red-hat/开始-

# yum install -y mongodb-org
Loaded plugins: fastestmirror
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: mirror.karneval.cz
 * epel: mirrors.nic.cz
 * extras: mirror.karneval.cz
 * updates: mirror.karneval.cz
No package mongodb-org available.
Error: Nothing to do

https://repo.mongodb.org/yum/redhat/6/mongodb-org/4.0/x86_64/存在

那为什么会失败？

谢谢