What is YUM?
- YUM (Yellowdog Updater Modified) is an open source command-line as well as graphical based package management tool for RPM (RedHat Package Manager) based Linux systems.
- It allows users and system administrator to easily install, update, remove or search software packages on a systems.
- YUM uses numerous third party repositories to install packages automatically by resolving their dependencies issues.
To setup local YUM repository using RHEL ISO image (Installation CD):
Step:1 Attach rhel6.4 ISO image to your virtual machine (server)
Step:2 Mount the RHEL6.4 ISO (CD) under /mnt
mount /dev/cdrom /mnt mount:according to mtab,/dev/sr0 is already mounted on /mnt
Step:3 Verify the CD drive mounted
# df -h /dev/sr0 3.5G 3.5G 0 100% /mnt Step:4 Update the following lines to create local YUM repository:
Step:5 Verify YUM repository
# yum repolist
Loaded plugins: product-id, security, subscription-manager
repo id repo name status
client client-repo 3,648 repolist: 3,648
To install packages using YUM:
To install a package called Firefox 14, just run the below command it will automatically find and install all required dependencies for Firefox.
- yum install fireforx
If you want to install packages automatically without asking any confirmation, use option -y as shown in below example.
- yum -y install firefox
To remove packages using YUM:
To remove a package completely with their all dependencies, just run the following command as shown below
- yum remove firefox
- yum –y remove firefox
To update a Package using YUM:
Let’s say you have outdated version of MySQL package and you want to update it to the latest stable version. Just run the following command it will automatically resolves all dependencies issues and install them.
- yum update mysql
To list a Package using YUM:
Use the list function to search for the specific package with name. For example to search for a package called openssh, use the command
- yum list openssh
To search for a Package using YUM:
If you don’t remember the exact name of the package, then use search function to search all the available packages to match the name of the package you specified. For example, to search all the packages that matches the word .
- yum search vsftpd
To get Information of a Package using YUM:
Say you would like to know information of a package before installing it. To get information of a package just issue the below command.
- yum info firefox
List all Available Packages using YUM
- yum list | less
To list all install packages using YUM
- yum list installed | less
Yum Provides Function:
Yum provides function is used to find which package a specific file belongs to.
For example, if you would like to know the name of the package that has the
# yum provides /etc/httpd/conf/httpd.conf
Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
httpd-2.2.15-26.el6.x86_64 : Apache HTTP Server Repo : client Matched from: Filename : /etc/httpd/conf/httpd.conf httpd-2.2.15-26.el6.x86_64 : Apache HTTP Server Repo : installed Matched from: Other : Provides-match: /etc/httpd/conf/httpd.conf
To check for Available Updates using Yum:
- yum check-update
To update System using Yum:
- yum update
To list all available Group Packages:
In Linux, number of packages are bundled to particular group. Instead of installing individual packages with yum, you can install particular group that will install all the related packages that belongs to the group.
For example to list all the available groups, just issue following command
- yum grouplist
Installed Groups: Administration Tools DNS Name Server FTP Server Graphics Java Development Legacy Network Server Available Groups Authoring and Publishing Base Beagle Cluster Storage Clustering Development Libraries To Install/Update/remove a Group Packages:
To install a particular package group, we use option as groupinstall.
Fore example, to install “MySQL Database“, just execute the below command.
# yum groupinstall ‘MySQL Database‘
# yum groupupdate ‘DNS Name Server‘
#yum groupremove ‘DNS Name Server’
List Enabled Yum Repositories
List all enabled/disabled Yum Repositories
yum repolist all
Install a Package from Specific Repository
yum –enablerepo=epel install phpmyadmin
To clean yum cache / View the history:
By default yum keeps all the repository enabled package data in /var/cache/yum/ with each sub-directory, to clean all cached files from enabled repository, you need to run the following command regularly to clean up all the cache and make sure that there is nothing unnecessary space is using.
yum clean all