Package Managers
RPM Package Manager
The RPM Package Manager (RPM) is a powerful command line driven package management system capable of installing, uninstalling, verifying, querying, and updating computer software packages.
Each software package consists of an archive of files along with information about the package like its version, a description, and the like.
There is also a library API, permitting advanced developers to manage such transactions from programming languages such as C, Perl or Python.
RPM commands
Display the list of all the installed packages with name, version, release and architecure
rpm -qa --queryformat "%{NAME}-%{VERSION}-%{RELEASE}.%{ARCH}\n"
Verify the integrity of an installed package
rpm -V <package-name>
# Example:
> rpm -V lvm2
S.5....T c /etc/lvm/lvm.conf
S.5....T c /etc/rc.d/init.d/lvm2-monitor
..5....T /lib/libdevmapper-event-lvm2mirror.so.2.02
S.5....T /sbin/lvm.static
.......T /usr/include/lvm2cmd.h
S.5....T /usr/lib/liblvm2cmd.a.2.02
S.5....T /usr/lib/liblvm2cmd.so.2.02
S.5....T /usr/sbin/lvm
S.5....T /usr/sbin/lvmdump
S.5....T d /usr/share/man/man5/lvm.conf.5.gz
S.5....T d /usr/share/man/man8/lvchange.8.gz
.......T d /usr/share/man/man8/lvconvert.8.gz
# Where:
#
# S File Size
# M File Mode (includes permissions and file type)
# 5 MD5 Checksum
# L Symbolic Link
# D Device (Major/Minor Numbers)
# U File Ownership
# G File Group
# T Modification Time
#
# c = configuration file
# d = documentation file
YUM Package Manager
The Yellowdog Updater (YUM) is an open-source command-line package-management utility for Linux operating systems using the RPM Package Manager.
Yum allows automatic updates, package and dependency management, on RPM-based distributions.
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RedHat-specific Commands
Register a server by using the tool rhnreg_ks (RHN Classic)
rhnreg_ks --force --username <usr> --password <pwd>
rhnreg_ks --force --username <usr> --password <pwd> --proxy=http://<proxy_ip>:80
Register a server by using the new tool subscription-manager (RedHat Subscription Manager)
Eventually add the proxy settings in the configuration file /etc/rhsm/rhsm.conf
proxy_hostname = 192.16.2.248
proxy_port = 8080
than run the command subscription-manager repos --enable
# add the repository RHEL6 HA
subscription-manager repos --enable=rhel-ha-for-rhel-6-server-rpms
Execute the command subscription-manager list to show the subscriptions being consumed by this system
subscription-manager list --consumed
If you need to remove en entitlement (in the example RHEL6 FasTrack)
subscription-manager repos --disable=rhel-6-server-fastrack-rpms \
--disable=rhel-6-server-optional-fastrack-rpms