Why do we need clean yum cache during bootstrap?

Hi Douglas,

Why do we need clean yum cache before installing packages during host 
installation?  It could cause a ssh timeout somtimes.  On my test VM, it 
needs several minutes do download yum metatada. Please see the test below:

[root@host1 tmp]# time yum update qemu-kvm
Loaded plugins: langpacks, presto, refresh-packagekit
fedora/metalink                                                                           
                             
| 8.6 kB     00:00
fedora                                                                                    
                             
| 4.2 kB     00:00
fedora/primary_db                                                                         
                             
|  14 MB     00:11
fedora/group_gz                                                                           
                             
| 434 kB     00:00
ovirt-nightly                                                                             
                             
| 1.3 kB     00:00
ovirt-nightly/primary                                                                     
                             
|  31 kB     00:00
ovirt-stable                                                                              
                             
| 1.3 kB     00:00
ovirt-stable/primary                                                                      
                             
|  15 kB     00:00
updates/metalink                                                                          
                             
| 4.6 kB     00:00
updates                                                                                   
                             
| 4.7 kB     00:00
updates/primary_db                                                                        
                             
| 5.9 MB     03:28
updates/group_gz                                                                          
                             
| 434 kB     00:21
ovirt-nightly                                                                             
                                            
183/183
ovirt-stable                                                                              
                                              
69/69
No Packages marked for Update

real    4m33.527s
user    0m5.741s
sys    0m0.772s

[root@host1 tmp]# time yum update qemu-kvm
Loaded plugins: langpacks, presto, refresh-packagekit
No Packages marked for Update

real    0m1.184s
user    0m1.048s
sys    0m0.115s


Thanks!
Mark

[Alon Bar-Lev]

Adding Doron,

I found one reason - if local repository files are updated, and hashes needs to be
re-generated.

Alon

----- Original Message -----
>  From: "Mark Wu" <wudxw(a)linux.vnet.ibm.com&gt;
>  To: "Douglas Schilling Landgraf" <dougsland(a)redhat.com&gt;
>  Cc: "VDSM Project Development" <vdsm-devel(a)lists.fedorahosted.org&gt;
>  Sent: Friday, September 21, 2012 11:41:57 AM
>  Subject: [vdsm] Why do we need clean yum cache during bootstrap?
>  
>  Hi Douglas,
>  
>  Why do we need clean yum cache before installing packages during host
>  installation?  It could cause a ssh timeout somtimes.  On my test VM,
>  it
>  needs several minutes do download yum metatada. Please see the test
>  below:
>  
>  [root@host1 tmp]# time yum update qemu-kvm
>  Loaded plugins: langpacks, presto, refresh-packagekit
>  fedora/metalink
>  | 8.6 kB     00:00
>  fedora
>  | 4.2 kB     00:00
>  fedora/primary_db
>  |  14 MB     00:11
>  fedora/group_gz
>  | 434 kB     00:00
>  ovirt-nightly
>  | 1.3 kB     00:00
>  ovirt-nightly/primary
>  |  31 kB     00:00
>  ovirt-stable
>  | 1.3 kB     00:00
>  ovirt-stable/primary
>  |  15 kB     00:00
>  updates/metalink
>  | 4.6 kB     00:00
>  updates
>  | 4.7 kB     00:00
>  updates/primary_db
>  | 5.9 MB     03:28
>  updates/group_gz
>  | 434 kB     00:21
>  ovirt-nightly
>  183/183
>  ovirt-stable
>  69/69
>  No Packages marked for Update
>  
>  real    4m33.527s
>  user    0m5.741s
>  sys    0m0.772s
>  
>  [root@host1 tmp]# time yum update qemu-kvm
>  Loaded plugins: langpacks, presto, refresh-packagekit
>  No Packages marked for Update
>  
>  real    0m1.184s
>  user    0m1.048s
>  sys    0m0.115s
>  
>  
>  Thanks!
>  Mark
>  
>  _______________________________________________
>  vdsm-devel mailing list
>  vdsm-devel(a)lists.fedorahosted.org
>  https://lists.fedorahosted.org/mailman/listinfo/vdsm-devel
>

On 09/21/2012 04:46 AM, Alon Bar-Lev wrote:
>  Adding Doron,
>
>  I found one reason - if local repository files are updated, and hashes needs to be
> re-generated.
>
>  Alon
>  
Running 'yum clean expire-cache' seems like a more efficient way to 
accomplish this.  I'd hope that in a typical "install os, install vdsm" 
scenario we wouldn't need a more heavy-handed cleanup.

Greg

>  ----- Original Message -----
> > From: "Mark Wu" <wudxw(a)linux.vnet.ibm.com&gt;
> > To: "Douglas Schilling Landgraf" <dougsland(a)redhat.com&gt;
> > Cc: "VDSM Project Development" <vdsm-devel(a)lists.fedorahosted.org&gt;
> > Sent: Friday, September 21, 2012 11:41:57 AM
> > Subject: [vdsm] Why do we need clean yum cache during bootstrap?
> >
> > Hi Douglas,
> >
> > Why do we need clean yum cache before installing packages during host
> > installation?  It could cause a ssh timeout somtimes.  On my test VM,
> > it
> > needs several minutes do download yum metatada. Please see the test
> > below:
> >
> > [root@host1 tmp]# time yum update qemu-kvm
> > Loaded plugins: langpacks, presto, refresh-packagekit
> > fedora/metalink
> > | 8.6 kB     00:00
> > fedora
> > | 4.2 kB     00:00
> > fedora/primary_db
> > |  14 MB     00:11
> > fedora/group_gz
> > | 434 kB     00:00
> > ovirt-nightly
> > | 1.3 kB     00:00
> > ovirt-nightly/primary
> > |  31 kB     00:00
> > ovirt-stable
> > | 1.3 kB     00:00
> > ovirt-stable/primary
> > |  15 kB     00:00
> > updates/metalink
> > | 4.6 kB     00:00
> > updates
> > | 4.7 kB     00:00
> > updates/primary_db
> > | 5.9 MB     03:28
> > updates/group_gz
> > | 434 kB     00:21
> > ovirt-nightly
> > 183/183
> > ovirt-stable
> > 69/69
> > No Packages marked for Update
> >
> > real    4m33.527s
> > user    0m5.741s
> > sys    0m0.772s
> >
> > [root@host1 tmp]# time yum update qemu-kvm
> > Loaded plugins: langpacks, presto, refresh-packagekit
> > No Packages marked for Update
> >
> > real    0m1.184s
> > user    0m1.048s
> > sys    0m0.115s
> >
> >
> > Thanks!
> > Mark
> >
> > _______________________________________________
> > vdsm-devel mailing list
> > vdsm-devel(a)lists.fedorahosted.org
> > https://lists.fedorahosted.org/mailman/listinfo/vdsm-devel
> >
>  _______________________________________________
>  vdsm-devel mailing list
>  vdsm-devel(a)lists.fedorahosted.org
>  https://lists.fedorahosted.org/mailman/listinfo/vdsm-devel
>