[CentOS] Mirror sync strategy or problem?

Wed Aug 3 11:36:18 UTC 2016
Johnny Hughes <johnny at centos.org>

On 08/03/2016 03:09 AM, Gianluca Cecchi wrote:
> Hello,
> I have a CentOS 7 server, right installed.
> I notice that some packages that are present  at
> http://mirror.centos.org/centos/7/updates/x86_64/Packages/
> are not present yet at some other mirrors (that are the ones my
> fastestmirror plugin picks up... even after a clean):
> http://centos.datente.com/media/7/updates/x86_64/Packages/
> or
> http://ct.mirror.garr.it/mirrors/CentOS/7/updates/x86_64/Packages/
> 
> For example packages like glibc, bash and dbus have updates dated 02 August
> on the main mirror site but not yet at the other two sites.
> if in Centos-Base.repo file, [updates] section, I use baseurl instead of
> mirrorlist entry and run
> 
> sudo yum clean all
> sudo yum update
> 
> I then get these packages' list:
> Dependencies Resolved
> 
> =====================================================================================================================
>  Package                                  Arch
> Version                           Repository         Size
> =====================================================================================================================
> Updating:
>  bash                                     x86_64
> 4.2.46-20.el7_2                   updates           1.0 M
>  dbus                                     x86_64
> 1:1.6.12-14.el7_2                 updates           306 k
>  dbus-libs                                x86_64
> 1:1.6.12-14.el7_2                 updates           151 k
>  dbus-x11                                 x86_64
> 1:1.6.12-14.el7_2                 updates            46 k
>  device-mapper-persistent-data            x86_64
> 0.6.2-1.el7_2                     updates           366 k
>  glibc                                    x86_64
> 2.17-106.el7_2.8                  updates           3.6 M
>  glibc-common                             x86_64
> 2.17-106.el7_2.8                  updates            11 M
>  gssproxy                                 x86_64
> 0.4.1-8.el7_2                     updates            84 k
>  initscripts                              x86_64
> 9.49.30-1.el7_2.3                 updates           429 k
>  iscsi-initiator-utils                    x86_64
> 6.2.0.873-33.el7_2.2              updates           419 k
>  iscsi-initiator-utils-iscsiuio           x86_64
> 6.2.0.873-33.el7_2.2              updates            82 k
>  libblkid                                 x86_64
> 2.23.2-26.el7_2.3                 updates           167 k
>  libgovirt                                x86_64
> 0.3.3-1.el7_2.4                   updates            64 k
>  libgudev1                                x86_64
> 219-19.el7_2.12                   updates            66 k
>  libmount                                 x86_64
> 2.23.2-26.el7_2.3                 updates           169 k
>  libsss_idmap                             x86_64
> 1.13.0-40.el7_2.12                updates           104 k
>  libsss_nss_idmap                         x86_64
> 1.13.0-40.el7_2.12                updates           103 k
>  libtiff                                  x86_64
> 4.0.3-25.el7_2                    updates           169 k
>  libuuid                                  x86_64
> 2.23.2-26.el7_2.3                 updates            74 k
>  mdadm                                    x86_64
> 3.3.2-7.el7_2.1                   updates           393 k
>  microcode_ctl                            x86_64
> 2:2.1-12.el7_2.1                  updates           535 k
>  open-vm-tools                            x86_64
> 9.10.2-5.el7_2                    updates           472 k
>  open-vm-tools-desktop                    x86_64
> 9.10.2-5.el7_2                    updates           161 k
>  sssd-client                              x86_64
> 1.13.0-40.el7_2.12                updates           158 k
>  systemd                                  x86_64
> 219-19.el7_2.12                   updates           5.1 M
>  systemd-libs                             x86_64
> 219-19.el7_2.12                   updates           358 k
>  systemd-python                           x86_64
> 219-19.el7_2.12                   updates            99 k
>  systemd-sysv                             x86_64
> 219-19.el7_2.12                   updates            53 k
>  util-linux                               x86_64
> 2.23.2-26.el7_2.3                 updates           1.9 M
> 
> Transaction Summary
> =====================================================================================================================
> Upgrade  29 Packages
> 
> Total download size: 28 M
> Is this ok [y/d/N]:
> 
> 
> What are typical delays in mirrors' sync? Or is there any problem in
> mirrors updates?

External Mirrors sync at whatever period they choose.  It could be daily
or multiple times per day.

It can certainly take up to 24 hours for the majority of external
mirrors to be updated.

Our script to verify mirrors can take 3-4 hours to run as well to
develop a new mirrorlist.

Yesterday at 2200 UTC, we released 24 SRPMs worth of updates.  That is a
significant amount of information. (around 200 RPMs and 150-200 MB of
info).  Based on the 24 hour period I usually use, I would expect most
mirror to be updated by 2200 UTC today (still 11 hours from now).

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