yum¶

Find RPM package containing a certain command¶

yum whatprovides */semanage

Which packages are installed within the base package group?¶

Use yum group info:

# yum group info base

Hint: On the RHEL installation media there is a XML file called /repodata/*-comps-Server-x86_64.xml where <grouplist> and <optionlist> shows the belonging package information

How to create a local repository copy from CDROM / ISO e.g. on web server¶

mkdir /var/www/html/inst
chcon -R --reference=/var/www/html /var/www/html/inst
cp -a /media/. /var/www/html/inst/

EPEL - Extra Packages for Enterprise Linux¶

Quite some packages are not included in standard yum repositories on RHEL, Centor, Fedora, …. EPEL is a Fedora Special Interest Group that creates, maintains, and manages a high quality set of additional packages.

yum --enablerepo=extras install epel-release

How to setup a local yum repository for locally mounted ISO¶

https://access.redhat.com/solutions/1355683

Issue

How to set up yum repository to use locally-mounted DVD with Red Hat Enterprise Linux (RHEL) 7
Would like to upgrade server from RHEL 7.x to RHEL 7.y
Have a secure environment that will never be connected to the internet, but still needs to be updated
Way to update the packages on server, with no satellite server and servers disconnected from internet
Offline patches for Red Hat systems
How do I create a local repository in RHEL 7?

Mount the RHEL 7 installation ISO to a directory like /mnt:
```
# mount -o loop RHEL7.1.iso /mnt
```
Copy the media.repo file from the root of the mounted directory to /etc/yum.repos.d/ and set the permissions to something sane:
```
# cp /mnt/media.repo /etc/yum.repos.d/rhel7dvd.repo
# chmod 644 /etc/yum.repos.d/rhel7dvd.repo
```

3. Edit the new repo file changing the gpgcheck=0 setting to 1 and adding the following 3 lines:

enabled=1
baseurl=file:///mnt/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

In the end, the new repo file could look like the following:

[InstallMedia]
name=DVD for Red Hat Enterprise Linux 7.1 Server
mediaid=1359576196.686790
metadata_expire=-1
gpgcheck=1
cost=500
enabled=1
baseurl=file:///mnt/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

clear the related caches by yum clean all and subscription-manager clean once:
```
# yum clean all
# subscription-manager clean
```
check whether you can get the packages list from the DVD repo:
```
# yum  --noplugins list
```
if no problem , you wil update:
```
# yum  --noplugins update
```

How to setup a local yum repository for locally mounted CDROM/DVD¶

http://www.itzgeek.com/how-tos/linux/centos-how-tos/create-local-yum-repository-on-centos-7-rhel-7-using-dvd.html

In case of a CDROM, mount the device (cdrom must be connected in esxi):
```
# mkdir /cdrom
# mount /dev/cdrom /cdrom
```

2. Before creating a repo file, move the existing repo files present in /etc/yum.repos.d directory, if not required:

mkdir /etc/yum.repos.d/original
mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/original

Create the new repo file called cdrom.repo under /etc/repos.d directory:
```
# vi /etc/yum.repos.d/local.repo
```

Enter follwing details:

[LocalRepo]
name=LocalRepository
baseurl=file:///cdrom
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

Clear the repository cache by issuing the following command:
```
# yum clean all
```