[SOLVED] YumRepo Error: All mirror URLs are not using ftp, h

[stefanopederzani]

Today I discovered with horror I could not update my CentOS 6.10 (Final) anymore.
Here something similar to the error message:
"YumRepo Error: All mirror URLs are not using ftp, http[s] or file"

Using the graphic app is not the best way to solve an error.
Surfing the web I discovered the command line I needed for debug:

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# yum repolist

This is the best way to verify everything is OK.
It was not.
I catch 2 or 3 error on top of the output and 3 on the middle, while it was ending with a list of repo and a column with the number of available mirror sites.
???????????
Going on surfing, I found the address of the main site has changed.
As stackoverflow reported on https://stackoverflow.com/questions/21396508/yumrepo-error-all-mirror-urls-are-not-using-ftp-https-or-file
we have to modify /etc/yum.repos.d/CentOS-Base.repo (I suggest a backup copy, before).
For every repo in that file we must:
1) Comment out "mirrorlist" line
2) Uncomment "baseurl" line
3) Replace in "baseurl" line "mirror.centos.org/centos" with "vault.centos.org".
Yes, we change the address and omit a part of the path, rest of the URL remains unchanged. (also here I suggest to make a copy of the original line).
For example:

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#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
baseurl=http://vault.centos.org/$releasever/updates/$basearch/


If we run again:

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# yum repolist

Most of the errors disappeared!
But it is not completely OK.
Scrolling down the same web page there is an admin still using CentOS 5.4 - an "ancient" version. He claims that substituting "$releasever" with "5.4" directly eliminates last errors.
So I did.

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#baseurl=http://vault.centos.org/$releasever/updates/$basearch/
baseurl=http://vault.centos.org/6.10/updates/$basearch/


And it works flawlessly!

[stefanopederzani]

Now I add in my second post some little helps more.

I personally cannot do a "yum update" from command line, because I cannot update neither Firefox nor Thunderbird for an alleged problem tied to my video board, too long to explain here.
But if you use to do so, "yum update" is what to do next, as well.

Personally I have to run the update via the graphic app, that is from the menu in the top left bar of the desktop: System->Administration->Software Update.
There I can uncheck FF and TB and start the update.
I noticed that everything was very faster than the last time it worked on the older servers.
I suspect the mirrorsite has gone disappearing slowly and relentlessly, until today when there are only the new ones. Maybe in the last days the search in the list of mirror was slowing the update.

Hope it helped!