yum installation manager not working in centos 6.6 - centos

Question

I'm facing a problem with yum installation manager in centos 6.6
root#mmopuru:~ # cat /etc/*release
CentOS release 6.6 (Final)
CentOS release 6.6 (Final)
CentOS release 6.6 (Final)
root#mmopuru:~ # uname -a
Linux mmopuru.puppetlabs.vm 2.6.32-504.el6.i686 #1 SMP Wed Oct 15 03:02:07 UTC 2014 i686 i686 i386 GNU/Linux
Its throwing following err. I tried clean all but no use.
root#mmopuru:~ # yum install python-pip
Loaded plugins: fastestmirror, security
Setting up Install Process
Repository 'updates' is missing name in configuration, using id
Loading mirror speeds from cached hostfile
* epel: ftp.cuhk.edu.hk
* ius: ftp.neowiz.com
* remi-safe: mirror.innosol.asia
* update: mirror.nbrc.ac.in
http://mirror.centos.org/centos/6/addons/i386/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: addons. Please verify its path and try again
How to resolve this?
When I run yum repolist
root#mmopuru:~ # yum repolist
Loaded plugins: fastestmirror, security
Repository 'updates' is missing name in configuration, using id
Loading mirror speeds from cached hostfile
epel/metalink | 4.0 kB 00:00
* epel: ftp.cuhk.edu.hk
* ius: mirror.amsiohosting.net
* remi-safe: mirrors.thzhost.com
* update: mirror.nbrc.ac.in
http://mirror.centos.org/centos/6/addons/i386/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
http://mirror.centos.org/centos/6/addons/i386/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
epel | 4.3 kB 00:00
epel/primary_db | 4.9 MB 00:05
ius | 2.2 kB 00:00
ius/primary_db | 194 kB 00:01
remi-safe | 2.9 kB 00:00
remi-safe/primary_db | 22 kB 00:00
update | 3.4 kB 00:00
update/primary_db | 3.7 MB 00:01
repo id repo name status
addons CentOS-6 - Addons 0
*epel Extra Packages for Enterprise Linux 6 - i386 9,857
ius IUS Community Packages for Enterprise Linux 6 - i386 356
remi-safe Safe Remi's RPM repository for Enterprise Linux 6 - i386 32
update CentOS-6 - Updates 989
repolist: 11,234
The content of /etc/yum.repos.d/centos-internal.repo is
root#mmopuru:~ # cat /etc/yum.repos.d/centos-internal.repo
# CentOS-Base.repo
#
# This file uses a new mirrorlist system developed by Lance Davis for CentOS.
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/PM-GPG-KEY-CentOS-6
#released updates
enabled=0
[update]
name=CentOS-$releasever - Updates
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/PM-GPG-KEY-CentOS-6
#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever - Addons
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons
#baseurl=http://mirror.centos.org/centos/$releasever/addons/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/PM-GPG-KEY-CentOS-6
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/PM-GPG-KEY-CentOS-6
#additional packages that extend functionality of existing packages
enabled=0
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/PM-GPG-KEY-CentOS-6
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/PM-GPG-KEY-CentOS-6

Answer 1

Remove the "addons" repository definition, which doesn't exists for CentOS 6 (it only exists for CentOS 5, but is empty).

Answer 2

I have just answered a similar question i.e. same error but for EPEL repo. I am answering here, may be it can come helpful for some future SO user.
Solution: The quick fix is to update your SSL certificates:
yum -y upgrade ca-certificates
Chances are the above error may also occur while certificate update, if so, just disable the repo i.e. addons which is causing the error, use the following command:
yum -y upgrade ca-certificates --disablerepo=addons
In case you're getting this same error for a different repo, just put it's name against the --disablerepo=<repo-name> flag.
Note: use sudo if you're not the root user.