• VMware

    Learn about VMware virtualization for its products like vsphere ESX and ESXi, vCenter Server, VMware View, VMware P2V and many more

  • Linux

    Step by step configuration tutorials for many of the Linux services like DNS, DHCP, FTP, Samba4 etc including many tips and tricks in Red Hat Linux.

  • Database

    Learn installation and configuration of databases like Oracle, My SQL, Postgresql, etc including many other related tutorials in Linux.

  • How to use yum locally without internet connection using cache?

    yum is an short abbreviation for Yellowdog Updater Modified

    What is yum?

    yum  is  an  interactive, rpm based, package manager. It can automatically perform system updates, including dependency analysis and obsolete processing based on "repository" metadata. It can also perform installation of  new  packages,  removal  of  old packages and perform queries on the installed and/or available packages among many other commands/services.

    How to use yum without internet connection?

    By default, yum deletes downloaded data files when they are no longer needed after a successful operation. This minimizes the amount of storage space that yum uses.

    However, you can enable caching, so that the package files downloaded by yum stay in cache directories. By using cached data, you can carry out certain operations without a network connection, you can also copy packages stored in the caches and reuse them elsewhere

    yum stores temporary files in the /var/cache/yum/$basearch/$releasever/directory, where $basearch and $releasever are Yum variables refering to base architecture of the system and the release version of Red Hat Enterprise Linux.

    You can find the values for the $basearch and $releasever variables in the output of the yum version command.
    # yum version
    Loaded plugins: fastestmirror, refresh-packagekit, security
    Warning: RPMDB altered outside of yum.
    Installed: 6/i386                  1143:95f0fe20d81af24850e6364a81367b66c9f4a1e2
    Group-Installed: yum                 14:3224f04a082a6cc0af5bc42667a6c5315ca35e96
    version

    Enabling the Caches






    To retain the cache of packages after a successful installation, add the following text to the [main] section of /etc/yum.conf.
    keepcache = 1 Once you enabled caching, every yum operation may download package data from the configured repositories.
    To download and make usable all the metadata for the currently enabled yum repositories, type:
    # yum makecache
    Loaded plugins: fastestmirror, refresh-packagekit, security
    Loading mirror speeds from cached hostfile
     * base: mirrors.ispros.com.bd
     * extras: mirror.digistar.vn
     * updates: mirror.vietoss.com
    base                                                     | 3.7 kB     00:00
    base/group_gz                                            | 214 kB     00:11
    base/filelists_db                                        | 5.1 MB     07:31
    base/primary_db                                          | 3.6 MB     08:58
    base/other_db                                            | 2.2 MB     05:25
    extras                                                   | 3.3 kB     00:00
    extras/filelists_db                                      |  31 kB     00:00
    extras/prestodelta                                       |   78 B     00:00
    extras/primary_db                                        |  28 kB     00:00
    extras/other_db                                          |  35 kB     00:01
    updates                                                  | 3.4 kB     00:00
    updates/filelists_db                                     | 614 kB     00:08
    updates/prestodelta                                      |  58 kB     00:00
    updates/primary_db                                       | 800 kB     00:10
    updates/other_db                                         | 6.0 MB     00:58
    Metadata Cache Created

    This is useful if you want to make sure that the cache is fully up to date with all metadata. To set the time after which the metadata will expire, use the metadata-expire setting in /etc/yum.conf.

    From man page
    makecache: Is used to download and make usable all the metadata for the currently enabled yum repos.

    Using yum in Cache-only Mode

    To carry out a yum command without a network connection, add the -C command-line option. With this option, yum proceeds without checking any network repositories, and uses only cached files. In this mode, yum may only install packages that have been downloaded and cached by a previous operation.
    # yum -C list glibc
    Loaded plugins: fastestmirror, refresh-packagekit, security
    Installed Packages
    glibc.i686                         2.12-1.132.el6                          @base
    Available Packages
    glibc.i686                         2.12-1.149.el6                          base

    So as you see we have an update for glibc package which we can install with out internet connection using the cache by using the below command
    # yum -C update glibc



    Clearing the yum Caches

    It is often useful to remove entries accumulated in the /var/cache/yum/ directory. If you remove a package from the cache, you do not affect the copy of the software installed on your system. To remove all entries for currently enabled repositories from the cache, type the following as a root:
    # yum clean all
    I hope the tutorial was helpful.
    Deepak Prasad

    is a techie and an author who is still trying to survive in this IT generation with very little knowledge he has on Linux/Unix, VMware, SAN Storage, Automation, networking etc

    You can follow him on Facebook or Google+


    Do you also have something to share here?
    Join GoLinuxHub Team as an Author, Click here for more information
    How to use yum locally without internet connection using cache? How to use yum locally without internet connection using cache? Reviewed by Deepak Prasad on Tuesday, November 18, 2014 Rating: 5

    No comments:

    Powered by Blogger.