How do I calculate RPM?

How do I calculate RPM?

One crucial measurement is revolutions per minute, or RPM, which describes the speed of a motor….For a 60 Hz system with four poles, the calculations to determine RPM would be:

1. (Hz x 60 x 2) / number of poles = no-load RPM.
2. (60 x 60 x 2) / 4.
3. 7,200 / 4 = 1,800 RPM.

How do I know if yum repo is enabled?

You need to pass the repolist option to the yum command. This option will show you a list of configured repositories under RHEL / Fedora / SL / CentOS Linux. The default is to list all enabled repositories. Pass -v (verbose mode) optionn for more information is listed.

How do rpm packages work?

RPM packaging set out to solve the software management problem by packaging metadata along with the software for an application. That metadata includes version numbers, the list of files in the package, a description of the package, information about the packager, and many other items.

How do I uninstall a yum package?

To uninstall a particular package, as well as any packages that depend on it, run the following command as root : yum remove package_name … Similar to install , remove can take these arguments: package names.

How do I download a package using yum?

Resolution

1. Install the package including “downloadonly” plugin: (RHEL5) # yum install yum-downloadonly (RHEL6) # yum install yum-plugin-downloadonly.
2. Run yum command with “–downloadonly” option as follows:
3. Confirm the RPM files are available in the specified download directory.

What is var cache Yum used for?

It manages packages, dependencies and updates on Linux systems. When a package is downloaded, installed and removed there are chances that the package may still be stored in YUM’s cache. The cached packages are usually located in /var/cache/yum.

What is RPM in laptop?

Short for revolutions per minute, RPM is used to help determine the access time on computer hard drives. RPM is a measurement of how many revolutions a computer’s hard drive makes in a single minute. The higher the RPM, the faster the data will be accessed.

How do I add an RPM to a yum repo?

Custom YUM Repository only holds the RPM package files we want to include in.

1. Step 1: Install “createrepo”
2. Step 2: Create Repository directory.
3. Step 3: Put RPM files to Repository directory.
4. Step 4: Run “createrepo”
5. Step 5: Create YUM Repository Configuration file.

How do I download an RPM package?

1. Download RPM packages with all dependencies using “Downloadonly” plugin

1. Download A RPM Package With All Dependencies Using “Downloadonly” Plugin.
2. List downloaded packages.
3. Download a RPM package with all dependencies using Yumdownloader utility.
4. List downloaded packages.

What is yum clean all?

The Solution. “yum clean” removes the cache of repositories which are enabled in /etc/yum. repos. Note that “all files” in the commands below means “all files in currently enabled repositories”. If you want to also clean any (temporarily) disabled repositories you need to use –enablerepo=’*’ option.

How do I know if my package is repossessed?

On the current version if the installed package is the same version as the most recent one available then the repo it was installed from is shown. If there is a newer package available, then it will be shown separately, with the new version showing the repo it’s available from.

Can var cache be deleted?

Unlike /var/spool , the cached files can be deleted without data loss. Files located under /var/cache may be expired in an application specific manner, by the system administrator, or both. The application must always be able to recover from manual deletion of these files (generally because of a disk space shortage).

How do I disable Yum cache?

This feature can be turned off by modifying the /etc/yum. conf file and changing the option “keepcache” to 0. keepcache when set to 0, removes packages after installation. Setting keepcache=1 instructs yum to keep the cache of headers and packages after a successful installation.

How do I install an RPM package?

We can install the RPM package with the following command: rpm -ivh <package name> . Note the -v option will show verbose output and the -h will show the hash marks, which represents action of the progress of the RPM upgrade. Lastly, we run another RPM query to verify the package will be available.

Is RPM a speed?

Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or with the notation min−1) is the number of turns in one minute. It is a unit of rotational speed or the frequency of rotation around a fixed axis.

Can I delete Yum cache?

Cached files use disk space until removed. You may wish to periodically clear the yum caches to recover capacity. Refer to Section 10.3, “Clearing the yum Caches” for information on clearing the caches. If you remove a package from the cache, you do not affect the copy of the software installed on your system.

How do I free up cache memory in Linux?

Every Linux System has three options to clear cache without interrupting any processes or services.

1. Clear PageCache only. # sync; echo 1 > /proc/sys/vm/drop_caches.
2. Clear dentries and inodes. # sync; echo 2 > /proc/sys/vm/drop_caches.
3. Clear PageCache, dentries and inodes.
4. sync will flush the file system buffer.

What is Yum cache?

By default, yum deletes downloaded data files when they are no longer needed after a successful operation. This minimizes the amount of storage space that yum uses. However, you can enable caching, so that the package files downloaded by yum stay in cache directories.

How do I find my yum repository?

repo files in the /etc/yum. repos. d/ directory . You should be able to see all the repositories from these two places.

What is Yum Localinstall?

Use the command yum localinstall /path/to/file. This command will install the local rpm file as well as searching for required rpms (dependencies, etc) on RHN or other repositories that are configured and install it for the user.

How do I use yum package manager?

yum package manager

1. To install a new package using yum, use the yum install command, along with the name of the package.
2. To update a package to the latest version, use the yum update command, along with the name of the package:
3. To display information about an installed package, use the yum info command and the name of the package:

How do I list RPM packages?

7. How to List Recently Installed RPM Packages. Use the following rpm command with -qa (query all) option, will list all the recently installed rpm packages.

Is it safe to remove var cache yum?

2 Answers. After successful installation, packages should be deleted from the yum cache. You should check in the file /etc/yum. conf , whether the keepcache setting is 1 instead of 0 .