CentOS - Apr 2010 - Could not retrieve mirror list while using yum command

Hi

I wanted to download and install the net-snmp package. Usually on my 
other CentOS boxes i use the following command to do it:

yum install net-snmp

I was able to successfully install net-snmp on 4 of my CentOS boxes but 
not on one of them. It reports me the following error message:

[root at localhost yum.repos.d]# yum install net-snmp
Loaded plugins: fastestmirror
Determining fastest mirrors
Could not retrieve mirrorlist 
http://mirrorlist.centos.org/?release=5&arch=i386&repo=os error was
[Errno 4] IOError: <urlopen error (110, 'Connection timed out')>
Error: Cannot find a valid baseurl for repo: base


Other output that can be some use is :

[root at localhost yum.repos.d]# ls
CentOS-Base.repo  CentOS-Media.repo


Can someone please let me know what the issue is ? and how to get it 
working ?

Thanks
Jatin

These are my contents of the CentOS-Base.repo file:

[root at localhost yum.repos.d]# vi CentOS-Base.repo
#released updates
[updates]
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=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#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=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#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=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#additional packages that extend functionality of existing packages
[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=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#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=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5


Thanks
Jatin

On 4/2/2010 9:08 AM, Jatin Davey wrote:
> Hi
>
> I wanted to download and install the net-snmp package. Usually on my
> other CentOS boxes i use the following command to do it:
>
> yum install net-snmp
>
> I was able to successfully install net-snmp on 4 of my CentOS boxes but
> not on one of them. It reports me the following error message:
>
> [root at localhost yum.repos.d]# yum install net-snmp
> Loaded plugins: fastestmirror
> Determining fastest mirrors
> Could not retrieve mirrorlist
> http://mirrorlist.centos.org/?release=5&arch=i386&repo=os error was
> [Errno 4] IOError:<urlopen error (110, 'Connection timed
out')>
> Error: Cannot find a valid baseurl for repo: base
>
>
> Other output that can be some use is :
>
> [root at localhost yum.repos.d]# ls
> CentOS-Base.repo  CentOS-Media.repo
>
>
> Can someone please let me know what the issue is ? and how to get it
> working ?
>
> Thanks
> Jatin
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>
>

On Thu, Apr 1, 2010 at 11:38 PM, Jatin Davey <jashokda at cisco.com>
wrote:
> Hi
>
> I wanted to download and install the net-snmp package. Usually on my
> other CentOS boxes i use the following command to do it:
>
> yum install net-snmp
>
> I was able to successfully install net-snmp on 4 of my CentOS boxes but
> not on one of them. It reports me the following error message:
>
> [root at localhost yum.repos.d]# yum install net-snmp
> Loaded plugins: fastestmirror
> Determining fastest mirrors
> Could not retrieve mirrorlist
> http://mirrorlist.centos.org/?release=5&arch=i386&repo=os error was
> [Errno 4] IOError: <urlopen error (110, 'Connection timed
out')>
> Error: Cannot find a valid baseurl for repo: base
>
Can you access the internet from that machine? Do you require a proxy
to connect?

Hi Kwan

I executed the following on the host that was having problem:

[root at localhost yum.repos.d]# wget http://www.google.com
--22:14:25--  http://www.google.com/
Resolving www.google.com... 74.125.19.105, 74.125.19.99, 74.125.19.106, ...
Connecting to www.google.com|74.125.19.105|:80... failed: Connection 
timed out.
Connecting to www.google.com|74.125.19.99|:80... failed: Connection 
timed out.

Which shows that i am not getting connected to the internet.

Now coming to the second point on whether i am using a proxy or not ? , 
I really dont know whether i am using a proxy or not. When i used a 
similar CentOS box on which i was successful in connecting to the 
internet i issues the same command as mentioned above and it got 
connected and downloaded the web file.

How do i find whether i have proxy configured on the host that is 
connecting to the internet ?
If you can guide me through this then i can replicate the configuration 
from the above host to the hosts that are not getting connected to the 
internet.

Thanks
Jatin

On 4/2/2010 10:28 AM, Kwan Lowe wrote:
> On Thu, Apr 1, 2010 at 11:38 PM, Jatin Davey<jashokda at cisco.com> 
wrote:
>    
>> Hi
>>
>> I wanted to download and install the net-snmp package. Usually on my
>> other CentOS boxes i use the following command to do it:
>>
>> yum install net-snmp
>>
>> I was able to successfully install net-snmp on 4 of my CentOS boxes but
>> not on one of them. It reports me the following error message:
>>
>> [root at localhost yum.repos.d]# yum install net-snmp
>> Loaded plugins: fastestmirror
>> Determining fastest mirrors
>> Could not retrieve mirrorlist
>> http://mirrorlist.centos.org/?release=5&arch=i386&repo=os error
was
>> [Errno 4] IOError:<urlopen error (110, 'Connection timed
out')>
>> Error: Cannot find a valid baseurl for repo: base
>>
>>      
> Can you access the internet from that machine? Do you require a proxy
> to connect?
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>
>

Ok, i  figured out the issue , Did some google on it and found this 
useful link on usage of proxy.

http://www.cyberciti.biz/faq/linux-unix-set-proxy-environment-variable/

Thanks Kwan , Thanks kwan for questioning me on the proxy usage.

Thanks
Jatin

On 4/2/2010 10:51 AM, Jatin Davey wrote:
> Hi Kwan
>
> I executed the following on the host that was having problem:
>
> [root at localhost yum.repos.d]# wget http://www.google.com
> --22:14:25--  http://www.google.com/
> Resolving www.google.com... 74.125.19.105, 74.125.19.99, 74.125.19.106, ...
> Connecting to www.google.com|74.125.19.105|:80... failed: Connection
> timed out.
> Connecting to www.google.com|74.125.19.99|:80... failed: Connection
> timed out.
>
> Which shows that i am not getting connected to the internet.
>
> Now coming to the second point on whether i am using a proxy or not ? ,
> I really dont know whether i am using a proxy or not. When i used a
> similar CentOS box on which i was successful in connecting to the
> internet i issues the same command as mentioned above and it got
> connected and downloaded the web file.
>
> How do i find whether i have proxy configured on the host that is
> connecting to the internet ?
> If you can guide me through this then i can replicate the configuration
> from the above host to the hosts that are not getting connected to the
> internet.
>
> Thanks
> Jatin
>
> On 4/2/2010 10:28 AM, Kwan Lowe wrote:
>    
>> On Thu, Apr 1, 2010 at 11:38 PM, Jatin Davey<jashokda at
cisco.com>   wrote:
>>
>>      
>>> Hi
>>>
>>> I wanted to download and install the net-snmp package. Usually on
my
>>> other CentOS boxes i use the following command to do it:
>>>
>>> yum install net-snmp
>>>
>>> I was able to successfully install net-snmp on 4 of my CentOS boxes
but
>>> not on one of them. It reports me the following error message:
>>>
>>> [root at localhost yum.repos.d]# yum install net-snmp
>>> Loaded plugins: fastestmirror
>>> Determining fastest mirrors
>>> Could not retrieve mirrorlist
>>> http://mirrorlist.centos.org/?release=5&arch=i386&repo=os
error was
>>> [Errno 4] IOError:<urlopen error (110, 'Connection timed
out')>
>>> Error: Cannot find a valid baseurl for repo: base
>>>
>>>
>>>        
>> Can you access the internet from that machine? Do you require a proxy
>> to connect?
>> _______________________________________________
>> CentOS mailing list
>> CentOS at centos.org
>> http://lists.centos.org/mailman/listinfo/centos
>>
>>
>>      
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>
>

Thanks Cornel.

Thanks
Jatin

On 4/2/2010 11:22 AM, cornel panceac wrote:
>
>
> 2010/4/2 Jatin Davey <jashokda at cisco.com <mailto:jashokda at
cisco.com>>
>
>     Ok, i  figured out the issue , Did some google on it and found this
>     useful link on usage of proxy.
>
>     http://www.cyberciti.biz/faq/linux-unix-set-proxy-environment-variable/
>
> or even better:
>
> http://www.centos.org/docs/5/html/yum/sn-yum-proxy-server.html
>
>
>
> -- 
> Among the maxims on Lord Naoshige's wall, there was this one:
"Matters
> of great concern should be treated lightly." Master Ittei commented, 
> "Matters of small concern should be treated seriously."
> (Ghost Dog : The Way of The Samurai)
>
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>    
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