CentOS - Dec 2018 - New CentOS7 Install Yum will not work

Hi Everyone:

I have been fighting this all morning.  I did a new (several) installs of
CentOS7.  Yum will not update the system.  I have disabled ipv6, set
yum.conf to use IPv4 only, disabled firewalld, disabled selinux, used both
static ip and dhcp for network connectivity.  I can ping any where on the
Internet, including the mirrors, DNS works and ensured the base URL line
was uncommented.  Any help would be appreciated.

Thanks,
Ed

This is the latest error I am seeing:
[root at localhost ~]# yum check-update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist
http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock
error was
14: curl#7 - "Failed connect to mirrorlist.centos.org:80; Operation now in
progress"
Could not retrieve mirrorlist
http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=extras&infra=stock
error was
14: curl#7 - "Failed connect to mirrorlist.centos.org:80; Operation now in
progress"


 One of the configured repositories failed (Unknown),
 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. Run the command with the repository temporarily disabled
            yum --disablerepo=<repoid> ...

     4. Disable the repository permanently, 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 <repoid>
        or
            subscription-manager repos --disable=<repoid>

     5. 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=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: extras/7/x86_64

On 12/5/18 10:48 AM, Ed Morrison wrote:
> This is the latest error I am seeing:
> [root at localhost ~]# yum check-update
> Could not retrieve mirrorlist
>
http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock
> error was
> 14: curl#7 - "Failed connect to mirrorlist.centos.org:80; Operation
now in
> progress"

What happens if you run "curl http://mirrorlist.centos.org/"?? I see
this:

$ curl http://mirrorlist.centos.org/
arch not specified

Test that, and then use curl on some other url.? "curl 
http://www.google.com/" maybe.

This should establish whether or not you have general network 
connectivity.?? Either way, you'll probably want to talk to your network 
admins regarding the result.

Hi Gordon,

Thanks for the help and sorry for the delay in response.

Curl fails.? This so weird. ? I dumped CentOS and installed Ubuntu, 
Ubuntu is working fine.? I have other CentOS, Windows and Ubuntu Vms 
working fine in the same environment. ? I am using the same IP info for 
Ubuntu that I was using for the CentOS VM.

I needed to get this server up and running, so I am going to keep Ubuntu 
in place for now.? I will try a new CentOS vm as time permits.


Thanks,

Ed


On 12/5/2018 7:37 PM, Gordon Messmer wrote:
> On 12/5/18 10:48 AM, Ed Morrison wrote:
>> This is the latest error I am seeing:
>> [root at localhost ~]# yum check-update
>> Could not retrieve mirrorlist
>>
http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock
>> error was
>> 14: curl#7 - "Failed connect to mirrorlist.centos.org:80;
Operation
>> now in
>> progress"
>
>
> What happens if you run "curl http://mirrorlist.centos.org/"?? I
see
> this:
>
> $ curl http://mirrorlist.centos.org/
> arch not specified
>
> Test that, and then use curl on some other url.? "curl 
> http://www.google.com/" maybe.
>
> This should establish whether or not you have general network 
> connectivity.?? Either way, you'll probably want to talk to your 
> network admins regarding the result.
>
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