Yum Remove

CentOS & RedHat Linux menggunakan yum sebagai perintah untuk mengatur instalasi paket (package management tool). Saya baru tahu dari Wikipedia kalau yum itu sendiri adalah singkatan dari “Yellowdog Updater, Modified”. Sintaks pemakaiannya mirip dengan apt-get-nya Debian/Ubuntu Linux. Misalnya untuk menginstal paket dari repositori, saya bisa menggunakan perintah yum install, Misalnya saya ingin memasang paket Apache web server (httpd) :

[root@web01 ~]# yum install httpd
Loaded plugins: fastestmirror
Determining fastest mirrors
CDROM                                                                                                                                        | 4.0 kB     00:00 ... 
CDROM/primary_db                                                                                                                             | 4.4 MB     00:00 ... 
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package httpd.x86_64 0:2.2.15-29.el6.centos will be installed
--> Processing Dependency: httpd-tools = 2.2.15-29.el6.centos for package: httpd-2.2.15-29.el6.centos.x86_64
--> Processing Dependency: apr-util-ldap for package: httpd-2.2.15-29.el6.centos.x86_64
--> Processing Dependency: /etc/mime.types for package: httpd-2.2.15-29.el6.centos.x86_64
--> Processing Dependency: libaprutil-1.so.0()(64bit) for package: httpd-2.2.15-29.el6.centos.x86_64
--> Processing Dependency: libapr-1.so.0()(64bit) for package: httpd-2.2.15-29.el6.centos.x86_64
--> Running transaction check
---> Package apr.x86_64 0:1.3.9-5.el6_2 will be installed
---> Package apr-util.x86_64 0:1.3.9-3.el6_0.1 will be installed
---> Package apr-util-ldap.x86_64 0:1.3.9-3.el6_0.1 will be installed
---> Package httpd-tools.x86_64 0:2.2.15-29.el6.centos will be installed
---> Package mailcap.noarch 0:2.1.31-2.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

====================================================================================================================================================================
 Package                                  Arch                              Version                                          Repository                        Size
====================================================================================================================================================================
Installing:
 httpd                                    x86_64                            2.2.15-29.el6.centos                             CDROM                            821 k
Installing for dependencies:
 apr                                      x86_64                            1.3.9-5.el6_2                                    CDROM                            123 k
 apr-util                                 x86_64                            1.3.9-3.el6_0.1                                  CDROM                             87 k
 apr-util-ldap                            x86_64                            1.3.9-3.el6_0.1                                  CDROM                             15 k
 httpd-tools                              x86_64                            2.2.15-29.el6.centos                             CDROM                             73 k
 mailcap                                  noarch                            2.1.31-2.el6                                     CDROM                             27 k

Transaction Summary
====================================================================================================================================================================
Install       6 Package(s)

Total download size: 1.1 M
Installed size: 3.6 M
Is this ok [y/N]: y
Downloading Packages:
--------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                27 MB/s | 1.1 MB     00:00     
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : apr-1.3.9-5.el6_2.x86_64                                                                                                                         1/6 
  Installing : apr-util-1.3.9-3.el6_0.1.x86_64                                                                                                                  2/6 
  Installing : apr-util-ldap-1.3.9-3.el6_0.1.x86_64                                                                                                             3/6 
  Installing : httpd-tools-2.2.15-29.el6.centos.x86_64                                                                                                          4/6 
  Installing : mailcap-2.1.31-2.el6.noarch                                                                                                                      5/6 
  Installing : httpd-2.2.15-29.el6.centos.x86_64                                                                                                                6/6 
  Verifying  : httpd-2.2.15-29.el6.centos.x86_64                                                                                                                1/6 
  Verifying  : apr-util-ldap-1.3.9-3.el6_0.1.x86_64                                                                                                             2/6 
  Verifying  : httpd-tools-2.2.15-29.el6.centos.x86_64                                                                                                          3/6 
  Verifying  : apr-1.3.9-5.el6_2.x86_64                                                                                                                         4/6 
  Verifying  : mailcap-2.1.31-2.el6.noarch                                                                                                                      5/6 
  Verifying  : apr-util-1.3.9-3.el6_0.1.x86_64                                                                                                                  6/6 

Installed:
  httpd.x86_64 0:2.2.15-29.el6.centos                                                                                                                               

Dependency Installed:
  apr.x86_64 0:1.3.9-5.el6_2        apr-util.x86_64 0:1.3.9-3.el6_0.1     apr-util-ldap.x86_64 0:1.3.9-3.el6_0.1     httpd-tools.x86_64 0:2.2.15-29.el6.centos    
  mailcap.noarch 0:2.1.31-2.el6    

Complete!
[root@web01 ~]#

Dari contoh di atas, terlihat bahwa yum tidak hanya memasang paket httpd, yum juga memasang beberapa paket lain yang diperlukan oleh httpd (dependencies packages). Dalam contoh tadi ada 5 paket tambahan yang ikut terpasang secara otomatis.

Nah lucunya saat saya ingin membuang paket httpd, paket-paket lain tadi tidak ikut terbuang. Misalnya dengan yum remove berikut ini :

[root@web01 ~]# yum install httpd
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
CDROM                                                                                                                                                                                                                  | 4.0 kB     00:00 ... 
Setting up Install Process
Package httpd-2.2.15-29.el6.centos.x86_64 already installed and latest version
Nothing to do
[root@web01 ~]# vi /etc/yum.conf 
[root@web01 ~]# yum remove httpd
Loaded plugins: fastestmirror
Setting up Remove Process
Resolving Dependencies
--> Running transaction check
---> Package httpd.x86_64 0:2.2.15-29.el6.centos will be erased
--> Finished Dependency Resolution
CDROM                                                                                                                                                                                                                  | 4.0 kB     00:00 ... 

Dependencies Resolved

==============================================================================================================================================================================================================================================
 Package                                              Arch                                                  Version                                                               Repository                                             Size
==============================================================================================================================================================================================================================================
Removing:
 httpd                                                x86_64                                                2.2.15-29.el6.centos                                                  @CDROM                                                2.9 M

Transaction Summary
==============================================================================================================================================================================================================================================
Remove        1 Package(s)

Installed size: 2.9 M
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Erasing    : httpd-2.2.15-29.el6.centos.x86_64                                                                                                                                                                                          1/1 
  Verifying  : httpd-2.2.15-29.el6.centos.x86_64                                                                                                                                                                                          1/1 

Removed:
  httpd.x86_64 0:2.2.15-29.el6.centos                                                                                                                                                                                                         

Complete!
[root@web01 ~]#

yum hanya membuang paket httpd saja. Ada 5 paket lain yang tadi ikut terinstal tidak terbuang juga.

[root@web01 ~]# rpm -qa | egrep "apr|httpd|mailcap"
apr-util-1.3.9-3.el6_0.1.x86_64
httpd-tools-2.2.15-29.el6.centos.x86_64
apr-1.3.9-5.el6_2.x86_64
apr-util-ldap-1.3.9-3.el6_0.1.x86_64
mailcap-2.1.31-2.el6.noarch
[root@web01 ~]#

Di Debian, ada opsi untuk menggunakan apt-get autoremove untuk menghapus sisa paket dependensi yang sudah tidak dipakai. Saya juga baru tahu ternyata ada opsi untuk mengatur yum supaya menghapus semua paket dependensinya. Opsi ini perlu diaktifkan dulu di dalam berkas /etc/yum.conf seperti ini :

[root@web01 ~]# echo "clean_requirements_on_remove=1" >> /etc/yum.conf

Opsi clean_requirements_on_remove akan membuat yum membersihkan setiap paket dependensinya. Setelah penambahan opsi tersebut, contohnya seperti berikut ini :

[root@web01 ~]# yum remove httpd
Loaded plugins: fastestmirror
Setting up Remove Process
Resolving Dependencies
--> Running transaction check
---> Package httpd.x86_64 0:2.2.15-29.el6.centos will be erased
--> Finished Dependency Resolution
--> Finding unneeded leftover dependencies
---> Marking httpd-tools to be removed - no longer needed by httpd
---> Marking apr-util-ldap to be removed - no longer needed by httpd
---> Marking mailcap to be removed - no longer needed by httpd
---> Marking apr-util to be removed - no longer needed by httpd-tools
---> Marking apr to be removed - no longer needed by httpd-tools
Found and removing 5 unneeded dependencies
--> Running transaction check
---> Package apr.x86_64 0:1.3.9-5.el6_2 will be erased
---> Package apr-util.x86_64 0:1.3.9-3.el6_0.1 will be erased
---> Package apr-util-ldap.x86_64 0:1.3.9-3.el6_0.1 will be erased
---> Package httpd-tools.x86_64 0:2.2.15-29.el6.centos will be erased
---> Package mailcap.noarch 0:2.1.31-2.el6 will be erased
--> Finished Dependency Resolution
CDROM                                                                                                                                                                                                                  | 4.0 kB     00:00 ... 

Dependencies Resolved

==============================================================================================================================================================================================================================================
 Package                                                    Arch                                                Version                                                             Repository                                           Size
==============================================================================================================================================================================================================================================
Removing:
 httpd                                                      x86_64                                              2.2.15-29.el6.centos                                                @CDROM                                              2.9 M
Removing for dependencies:
 apr                                                        x86_64                                              1.3.9-5.el6_2                                                       @CDROM                                              296 k
 apr-util                                                   x86_64                                              1.3.9-3.el6_0.1                                                     @CDROM                                              198 k
 apr-util-ldap                                              x86_64                                              1.3.9-3.el6_0.1                                                     @CDROM                                              9.3 k
 httpd-tools                                                x86_64                                              2.2.15-29.el6.centos                                                @CDROM                                              137 k
 mailcap                                                    noarch                                              2.1.31-2.el6                                                        @CDROM                                               52 k

Transaction Summary
==============================================================================================================================================================================================================================================
Remove        6 Package(s)

Installed size: 3.6 M
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Erasing    : httpd-2.2.15-29.el6.centos.x86_64                                                                                                                                                                                          1/6 
  Erasing    : httpd-tools-2.2.15-29.el6.centos.x86_64                                                                                                                                                                                    2/6 
  Erasing    : apr-util-ldap-1.3.9-3.el6_0.1.x86_64                                                                                                                                                                                       3/6 
  Erasing    : mailcap-2.1.31-2.el6.noarch                                                                                                                                                                                                4/6 
  Erasing    : apr-util-1.3.9-3.el6_0.1.x86_64                                                                                                                                                                                            5/6 
  Erasing    : apr-1.3.9-5.el6_2.x86_64                                                                                                                                                                                                   6/6 
  Verifying  : httpd-2.2.15-29.el6.centos.x86_64                                                                                                                                                                                          1/6 
  Verifying  : apr-util-ldap-1.3.9-3.el6_0.1.x86_64                                                                                                                                                                                       2/6 
  Verifying  : httpd-tools-2.2.15-29.el6.centos.x86_64                                                                                                                                                                                    3/6 
  Verifying  : apr-1.3.9-5.el6_2.x86_64                                                                                                                                                                                                   4/6 
  Verifying  : mailcap-2.1.31-2.el6.noarch                                                                                                                                                                                                5/6 
  Verifying  : apr-util-1.3.9-3.el6_0.1.x86_64                                                                                                                                                                                            6/6 

Removed:
  httpd.x86_64 0:2.2.15-29.el6.centos                                                                                                                                                                                                         

Dependency Removed:
  apr.x86_64 0:1.3.9-5.el6_2              apr-util.x86_64 0:1.3.9-3.el6_0.1              apr-util-ldap.x86_64 0:1.3.9-3.el6_0.1              httpd-tools.x86_64 0:2.2.15-29.el6.centos              mailcap.noarch 0:2.1.31-2.el6             

Complete!
[root@web01 ~]#

Dengan begitu sekarang tidak ada lagi paket dependensi yang tertinggal :

[root@web01 ~]# rpm -qa | egrep "apr|httpd|mailcap"
[root@web01 ~]#

Repositori Lokal DVD RHEL

Tiap kali menggunakan Ubuntu atau Debian, saya selalu menggunakan repositori online saat perlu memasang paket/aplikasi tertentu (software). Perintah apt-get atau aptitude akan otomatis mengunduh instaler paket dari repositori di Internet. Memang perlu koneksi internet tiap kali akan memasang paket. Dulu saat saya masih kesulitan mendapat akses internet, saya mengoleksi banyak CD/DVD repositori Ubuntu. Kalau tidak salah ingat dulu Ubuntu 7.04 punya 5 atau 6 CD repositori. Debian lebih fantastis lagi, jumlah CD repositorinya sampai puluhan. DVD Debian terbaru versi 7.4.0 jumlahnya sampai 9 buah. Sangat tidak praktis mengoleksi semua DVD repositori tadi. Menggunakan media CD/DVD tentu rentan hilang, rusak tidak bisa terbaca, dan repot karena harus menggonta-ganti CD/DVD saat memasang paket tertentu. Memang masih bisa diakali dengan menyimpan ISO image dari CD/DVD tadi, tapi ini juga tidak praktis karena membutuhkan ruang yang cukup besar dalam harddisk.

Dulu saya pernah tulis cara menjadikan DVD Ubuntu Linux sebagai sumber repositori lokal. Tadi saya kembali ingat hal ini saat menginstal Red Hat Linux. Tidak seperti Debian atau Ubuntu, Red Hat Enterprise Linux (RHEL) menyediakan online repositori hanya bagi pengguna yang membeli lisensinya. Namun demikian saya masih tetap bisa menggunakan DVD instalasi sebagai repositori lokal. Saya tidak tahu persisnya, aplikasi apa yang tidak tersedia dalam DVD & hanya bisa didapat dari online repositori resminya RHEL.

Tulisan ini akan jadi catatan saya untuk menjadikan DVD instalasi RHEL 6.4 sebagai repositori lokal.

Tadi saya menginstal virtual mesin dengan hostname redhat6, mesin ini menggunakan RHEL 6.4

[root@redhat6 ~]# uname -a
Linux redhat6 2.6.32-358.el6.x86_64 #1 SMP Tue Jan 29 11:47:41 EST 2013 x86_64 x86_64 x86_64 GNU/Linux
[root@redhat6 ~]# 
[root@redhat6 ~]# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 6.4 (Santiago)
[root@redhat6 ~]#

Tanpa repositori lokal saya tidak bisa memasang paket nmap. Saat mencoba mencari paket nmap saya mendapati error seperti ini :

[root@redhat6 yum.repos.d]# yum search nmap
Loaded plugins: product-id, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Warning: No matches found for: nmap
No Matches found
[root@redhat6 yum.repos.d]#

RHEL menempatkan konfigurasi repositori dalam direktori /etc/yum.repos.d :

[root@redhat6 ~]# cd /etc/yum.repos.d/
[root@redhat6 yum.repos.d]# ls
rhel-source.repo
[root@redhat6 yum.repos.d]#

Ada 1 berkas konfigurasi bawaan proses instalasi OS seperti berikut ini :

[root@redhat6 yum.repos.d]# cat rhel-source.repo 
[rhel-source]
name=Red Hat Enterprise Linux $releasever - $basearch - Source
baseurl=ftp://ftp.redhat.com/pub/redhat/linux/enterprise/$releasever/en/os/SRPMS/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

[rhel-source-beta]
name=Red Hat Enterprise Linux $releasever Beta - $basearch - Source
baseurl=ftp://ftp.redhat.com/pub/redhat/linux/beta/$releasever/en/os/SRPMS/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-beta,file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[root@redhat6 yum.repos.d]#

Karena saya ingin menjadikan DVD instalasi RHEL sebagai repositori lokal, tentu langkah pertama adalah mengakses DVDnya terlebih dulu. Saya mount DVD RHEL 6.4 ke direktori /mnt:

[root@redhat6 yum.repos.d]# mount -o loop /dev/cdrom /mnt
[root@redhat6 yum.repos.d]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_redhat6-lv_root
                      5.5G  931M  4.3G  18% /
tmpfs                 499M     0  499M   0% /dev/shm
/dev/sda1             485M   33M  427M   8% /boot
/dev/sr0              3.5G  3.5G     0 100% /mnt
[root@redhat6 yum.repos.d]#

Langkah selanjutnya saya buat berkas konfigurasi baru, saya pilih nama iso-rhel6.repo. Tiap berkas konfigurasi repositori boleh menggunakan nama apa saja asalkan diakhiri dengan *.repo.

[root@redhat6 yum.repos.d]# vi iso-rhel6.repo 
[ISO_RHEL64]
name=ISO RHEL64_x86_64
baseurl=file:///mnt
enabled=1 
gpgcheck=0
[root@redhat6 yum.repos.d]#

Isi berkasnya paling tidak harus terdiri dari id, name & baseurl. ID dituliskan dalam tanda kurung kotak [ISO_RHEL64]. Sejauh yang saya tahu tidak ada aturan khusus untuk memilih ID repo tadi. Pada contoh di atas, baseurl saya arahkan untuk mengakses direktori /mnt (mountpoint DVD). Selanjutnya saya tinggal jalankan 2 perintah seperti berikut ini :

[root@redhat6 yum.repos.d]# yum clean all
Loaded plugins: product-id, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Cleaning repos: ISO_RHEL64
Cleaning up Everything
[root@redhat6 yum.repos.d]# yum repolist
Loaded plugins: product-id, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
ISO_RHEL64                                                                                                                                                | 3.9 kB     00:00 ... 
ISO_RHEL64/primary_db                                                                                                                                     | 3.1 MB     00:00 ... 
repo id                                                                           repo name                                                                                status
ISO_RHEL64                                                                        ISO RHEL64_x86_64                                                                        3,648
repolist: 3,648
[root@redhat6 yum.repos.d]#

Setelah sistem selesai membuat repositori lokal, saya bisa memeriksanya dengan perintah yum repolist seperti contoh berikut ini :

[root@redhat6 yum.repos.d]# yum repolist
Loaded plugins: product-id, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
repo id                                                                           repo name                                                                                status
ISO_RHEL64                                                                        ISO RHEL64_x86_64                                                                        3,648
repolist: 3,648
[root@redhat6 yum.repos.d]#

Artinya sekarang sistem sudah punya repositori lokal dengan nama “ISO RHEL64_x86_64”. Untungnya paket nmap tersedia dalam DVD ini :

[root@redhat6 yum.repos.d]# yum search nmap
Loaded plugins: product-id, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
=============================================================================== N/S Matched: nmap ===============================================================================
nmap.x86_64 : Network exploration tool and security scanner

  Name and summary matches only, use "search all" for everything.
[root@redhat6 yum.repos.d]#

Dengan begitu saya tinggal menggunakan perintah yum install untuk memasang nmap, yum akan mengambil berkas sumber nmap dari DVD bukan dari Internet :

[root@redhat6 yum.repos.d]# yum install nmap
Loaded plugins: product-id, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package nmap.x86_64 2:5.51-2.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=================================================================================================================================================================================
 Package                               Arch                                    Version                                         Repository                                   Size
=================================================================================================================================================================================
Installing:
 nmap                                  x86_64                                  2:5.51-2.el6                                    ISO_RHEL64                                  2.8 M

Transaction Summary
=================================================================================================================================================================================
Install       1 Package(s)

Total download size: 2.8 M
Installed size: 9.7 M
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : 2:nmap-5.51-2.el6.x86_64                                                                                                                                      1/1 
ISO_RHEL64/productid                                                                                                                                      | 1.7 kB     00:00 ... 
  Verifying  : 2:nmap-5.51-2.el6.x86_64                                                                                                                                      1/1 

Installed:
  nmap.x86_64 2:5.51-2.el6                                                                                                                                                       

Complete!
[root@redhat6 yum.repos.d]#

CentOS sebagai salah satu varian open source Red Hat, langsung menyediakan repositori online sejak awal instalasi. Pada contoh di bawah ini terlihat CentOS langsung mendeteksi lokasi repositori online yang paling cepat diakses :

[root@centos ~]# uname -a
Linux centos 2.6.32-358.el6.x86_64 #1 SMP Fri Feb 22 00:31:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
[root@centos ~]# 
[root@centos ~]# cat /etc/redhat-release 
CentOS release 6.4 (Final)
[root@centos ~]# 
[root@centos ~]# yum repolist
Loaded plugins: fastestmirror, security
Determining fastest mirrors
 * base: mirror.axarva.co.id
 * extras: mirror.axarva.co.id
 * updates: mirror.axarva.co.id
base                                                                                                                                                      | 3.7 kB     00:00     
base/primary_db                                                                                                                                           | 4.4 MB     00:10     
extras                                                                                                                                                    | 3.4 kB     00:00     
extras/primary_db                                                                                                                                         |  19 kB     00:00     
updates                                                                                                                                                   | 3.4 kB     00:00     
updates/primary_db                                                                                                                                        | 2.5 MB     00:03     
repo id                                                                         repo name                                                                                  status
base                                                                            CentOS-6 - Base                                                                            6,367
extras                                                                          CentOS-6 - Extras                                                                             14
updates                                                                         CentOS-6 - Updates                                                                           718
repolist: 7,099
[root@centos ~]# 
[root@centos ~]# yum search nmap
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
 * base: mirror.axarva.co.id
 * extras: mirror.axarva.co.id
 * updates: mirror.axarva.co.id
=============================================================================== N/S Matched: nmap ===============================================================================
nmap-frontend.noarch : The GTK+ front end for nmap
nmap.x86_64 : Network exploration tool and security scanner

  Name and summary matches only, use "search all" for everything.
[root@centos ~]#

Saya juga bisa pakai cara yang sama untuk menjadikan DVD instalasi CentOS sebagai repositori lokal. Untuk testing, saya pindahkan dulu konfigurasi repositorinya CentOS ke dalam folder backup :

[root@centos ~]# mkdir /etc/yum.repos.d/backup
[root@centos ~]# mv /etc/yum.repos.d/*repo /etc/yum.repos.d/backup
[root@centos ~]#

Selanjutnya sama persis seperti sudah ditulis di atas :

[root@centos ~]# mount -o loop /dev/cdrom /mnt
    [root@centos ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_centos-lv_root
                      3.6G  844M  2.6G  25% /
tmpfs                 939M     0  939M   0% /dev/shm
/dev/sda1             485M   37M  423M   8% /boot
/dev/sr0              4.1G  4.1G     0 100% /mnt
[root@centos ~]# 
[root@centos ~]# vi /etc/yum.repos.d/iso-centos64.repo
[ISO_CentOS64]
name=ISO CentOS64_x86_64
baseurl=file:///mnt
gpgcheck=0
[root@centos ~]# 
[root@centos ~]# yum repolist
Loaded plugins: fastestmirror, security
Determining fastest mirrors
ISO_CentOS64                                                                                                                                              | 4.0 kB     00:00 ... 
ISO_CentOS64/primary_db                                                                                                                                   | 4.4 MB     00:00 ... 
repo id                                                                           repo name                                                                                status
ISO_CentOS64                                                                      ISO CentOS64_x86_64                                                                      6,381
repolist: 6,381
[root@centos ~]# 
[root@centos ~]# yum install -q  nmap

=================================================================================================================================================================================
 Package                               Arch                                    Version                                       Repository                                     Size
=================================================================================================================================================================================
Installing:
 nmap                                  x86_64                                  2:5.51-2.el6                                  ISO_CentOS64                                  2.7 M

Transaction Summary
=================================================================================================================================================================================
Install       1 Package(s)

Is this ok [y/N]: y
[root@centos ~]#