If the verification of a package signature fails, the package may be altered and therefore cannot be trusted. The Yum package manager allows for an automatic verification of all packages it installs or upgrades.
This feature is enabled by default. Use the following command to manually verify package files on your filesystem:. Installing Signed Packages. To install verified packages see Section 3. Use a shell glob to install several packages at once. For example, the following commands installs all. Before installing any security errata, be sure to read any special instructions contained in the erratum report and execute them accordingly.
See Section 3. Applying Changes Introduced by Installed Updates. After downloading and installing security errata and updates, it is important to halt the usage of the old software and begin using the new software. How this is done depends on the type of software that has been updated. The following list itemizes the general categories of software and provides instructions for using updated versions after a package upgrade. In general, rebooting the system is the surest way to ensure that the latest version of a software package is used; however, this option is not always required, nor is it always available to the system administrator.
Applications User-space applications are any programs that can be initiated by the user. Typically, such applications are used only when the user, a script, or an automated task utility launch them.
Once such a user-space application is updated, halt any instances of the application on the system, and launch the program again to use the updated version. The kernel is the core software component for the Red Hat Enterprise Linux 7 operating system. It manages access to memory, the processor, and peripherals, and it schedules all tasks.
Because of its central role, the kernel cannot be restarted without also rebooting the computer. Therefore, an updated version of the kernel cannot be used until the system is rebooted. When the qemu-kvm and libvirt packages are updated, it is necessary to stop all guest virtual machines, reload relevant virtualization modules or reboot the host system , and restart the virtual machines.
Use the lsmod command to determine which modules from the following are loaded: kvm , kvm-intel , or kvm-amd. Then use the modprobe -r command to remove and subsequently the modprobe -a command to reload the affected modules.
Fox example:. A: While it is best practice and recommended to restart your service or application, it depends on the application deployment strategy; for example: In Java-based applications, yes, the application servers must be restarted after applying the security fix.
Subscriber exclusive content A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more. New to Red Hat? Learn more about Red Hat subscriptions. NT Newbie 4 points. Nathaniel Turner. Red Hat Newbie 2 points. Nirjhar Jajodia. RHEL7 is not affected. RS Community Member 94 points. Rich Smit.
Red Hat Community Member 25 points. Cliff Perry. AR Newbie 10 points. Abhimanyu Rana. DP Newbie 2 points. Dieter Plattenhardt. RHEL8 is not affected. AD Newbie 5 points. Abu Davis. Does this affect Openshift that runs coreOS in anyway? Miroslav Kovalcik. RM Newbie 4 points. Rob Meredith. Is there a workaround similar for OpenShift 3? This article relates to OpenShift 4.
Jody Dorchester. Raghavan Ashokkumar. Red Hat. Chess Hazlett. RW Newbie 5 points. Ricardo Wesley. XK Red Hat. Xinyi Ke. Does it affect Ansible Tower? Red Hat Pro points. Yogendra Jog. RS Community Member 59 points. Rob Stannard. Ramakrishnan Kannusamy.
ED Newbie 4 points. Evolution Digital. Does this affect apache tomcat service which uses log4j library? MS Newbie 4 points. MFT Support. Patrick Nick. AP Red Hat. Aishwarya Patil. Does it affect RHEL 5. Each Application Stream has a given life cycle, either the same as RHEL 8 or shorter, more suitable to the particular application.
Modules are collections of packages representing a logical unit: an application, a language stack, a database, or a set of tools. These packages are built, tested, and released together.
Module streams represent versions of the Application Stream components. Only one module stream can be installed on the system. Different versions can be used in separate containers. Detailed module commands are described in the Installing, managing, and removing user-space components document. For a list of modules available in AppStream, see the Package manifest. The following section describes how to use yum to:. Replace term with a term related to the package. Note that yum search command returns term matches within the name and summary of the packages.
This makes the search faster and enables you to search for packages you do not know the name of, but for which you know a related term. Replace term with a term you want to search for in a package name, summary, or description. Note that yum search --all enables a more exhaustive but slower search. To list all packages in all enabled repositories that are available to install, use:.
Note that you can filter the results by appending global expressions as arguments. See Section Note that you can filter the results by passing the ID or name of repositories as arguments or by appending global expressions.
Replace package-name with the name of the package. Note that you can filter the results by appending command line options for the yum group list command --hidden , --available. For more available options see the man pages. To list mandatory and optional packages contained in a particular group, use:. Replace group-name with the name of the group. Global expressions must be escaped when passed as arguments to the yum command.
To ensure global expressions are passed to yum as intended, use one of the following methods:. Replace file-name with the name of the file. Replace package-name-1 and package-name-2 with the names of the packages. When installing packages on a multilib system AMD64, Intel 64 machine , you can specify the architecture of the package by appending it to the package name:. Replace package-name. If you know the name of the binary you want to install, but not the package name, you can use the path to the binary as an argument:.
Note that you can optimize the package search by explicitly defining how to parse the argument. Replace group-name with the full name of the group or environmental group. Replace groupID with the ID of the group. To optimize the installation and removal process, you can append -n , -na , or -nerva suffixes to yum install and yum remove commands to explicitly define how to parse an argument:. Replace name with the exact name of the package. Replace name and architecture with the exact name and architecture of the package.
To install a package using its exact name, epoch, version, release, and architecture, use:. Replace name , epoch , version , release , and architecture with the exact name, epoch, version, release, and architecture of the package.
You can list packages that need updating and choose to update a single package, multiple packages, or all packages at once. If any of the packages you choose to update have dependencies, they are updated as well.
To see which packages installed on your system have available updates, use:. The output returns the list of packages and their dependencies that have an update available.
When applying updates to kernel, yum always installs a new kernel regardless of whether you are using the yum update or yum install command. Replace group-name with the name of the package group. To upgrade to the latest available packages that have security errata, use:. To check and download package updates automatically and regularly, you can use the DNF Automatic tool that is provided by the dnf-automatic package.
DNF Automatic is an alternative command-line interface to yum that is suited for automatic and regular execution using systemd timers, cron jobs and other such tools. DNF Automatic synchronizes package metadata as needed and then checks for updates available. After, the tool can perform one of the following actions depending on how you configure it:. The outcome of the operation is then reported by a selected mechanism, such as the standard output or email. The following procedure describes how to install the DNF Automatic tool.
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