I'm trying to install mongodb on a completely newly-built machine. Worked yesterday, but today does not.

1. cat /etc/yum.repos.d/mongodb.repo
   [mongodb]
   name=MongoDB Repository
   baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/x86_64/
   gpgcheck=0
   enabled=1

1. yum install mongodb-org
   Loaded plugins: fastestmirror, langpacks
   base | 3.6 kB 00:00:00
   extras | 3.4 kB 00:00:00
   hpsum | 2.5 kB 00:00:00
   mongodb | 951 B 00:00:00
   updates | 3.4 kB 00:00:00
   mongodb/primary FAILED
   http://downloads-distro.mongodb.org/repo/redhat/os/x86_64/repodata/primary.xml.gz: [Errno -1] Metadata file does not match checksum 0.0 B/s | 0 B 00:00:00
   Trying other mirror.
   Loading mirror speeds from cached hostfile

• base: centos-distro.cavecreek.net
• extras: centos.escapemg.com
• updates: centos-distro.cavecreek.net
  mongodb/primary | 39 kB 00:00:00
  http://downloads-distro.mongodb.org/repo/redhat/os/x86_64/repodata/primary.xml.gz: [Errno -1] Metadata file does not match checksum
  Trying other mirror.

One of the configured repositories failed (MongoDB Repository),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:

1. Contact the upstream for the repository and get them to fix the problem.

2. Reconfigure the baseurl/etc. for the repository, to point to a working
upstream. This is most often useful if you are using a newer
distribution release than is supported by the repository (and the
packages for the previous distribution release still work).

3. Disable the repository, so yum won't use it by default. Yum will then
just ignore the repository until you permanently enable it again or use
--enablerepo for temporary usage:

yum-config-manager --disable mongodb

4. Configure the failing repository to be skipped, if it is unavailable.
Note that yum will try to contact the repo. when it runs most commands,
so will have to try and fail each time (and thus. yum will be be much
slower). If it is a very temporary problem though, this is often a nice
compromise:

yum-config-manager --save --setopt=mongodb.skip_if_unavailable=true

failure: repodata/primary.xml.gz from mongodb: [Errno 256] No more mirrors to try.
http://downloads-distro.mongodb.org/repo/redhat/os/x86_64/repodata/primary.xml.gz: [Errno -1] Metadata file does not match checksum