RHCE Study notes (+) RPM and YUM

This section and the teacher learned the use of software packages

First look at how RPM is used, this command can be used to query, install, uninstall, update packages

Simply put, the back with Q is the query, I is installed, you are updated, E is unloaded, V is verified, we come to see

The first is the query,-QA means that all installed packages are queried, as shown below

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It is worth mentioning that the RPM essence is a pre-compiled package, the path of the different files have been configured in advance. If you want to see what directories an installation package installs to, you can extract it from Cpio.

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-QL can view the associated path of a package that has already been installed

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-QF can see what packages are installed by the path to the file

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-Q There are many combinations of options to see

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-QC can view configuration files

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-QLP can view the package information

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Now look at how to install the common collocation is-IVH, as shown below, notice that he has a warning message, this is why? This is because Red Hat's software package uses a digital signature, the basic principle is a to a random value C generates a hash value D, and then use the private key to encrypt D to get e, and then the encrypted e and random value C are sent to the b,b with the public key decryption E after the random value of the hash d, see whether the consistent

Because the public key is not installed on this machine because it cannot be verified

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We can also verify by-K

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The solution is simple, import the public key is OK

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Test after import the warning is gone.

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Next look at the update package RPM-UVH XXX

The essence of the update is to uninstall the old version and then follow the new version. The normal package is not multi-version coexistence, so if you use-IVH to install the latest version of the package, he will prompt the conflict, need to use the-UVH update;

However, the kernel can coexist in multiple versions, so it is not possible to use-UVH when updating the kernel, but should use-IVH

View the current kernel

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Finally, look at the-V authentication package, install a package, and then go through-V to see if any files have been modified.

The newly installed FTP service didn't make any changes.

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Modify the Readme

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The above with RPM installation package has a problem is the dependency of the package, often a package also depends on other software packages, if a manual installation is very cumbersome, how to solve it, you can use Yum directly from the specified Yum source server automatically download all dependent packages

Here is an exercise, configuring two servers, rhce7-01 Yum source pointing to the local disc, rhce7-00 to rhce7-01 FTP server

Configuration file Repo file can be configured under/etc/yum.repos.d/

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Note Gpgcheck I write 0, if it is 1, need to configure the public key also need to specify the path

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Clear the cache, notice a warning

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These plug-ins do not need, you can manually shut down, the corresponding enabled to change to 0 on the line

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Under 01, point to local, so Baseurl=file:///var/ftp/iso

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Next, install the FTP service on 01

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Reboot

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Under FTP, create a subdirectory/iso, and then mount the disc

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Clear the cache, delete the firewall policy, and confirm that the SELinux status allows process access

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Go back to 00 and check again.

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Test the repolist and successfully pass.

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After knowing the Yum source, see what Yum options Yum list can list if the package is installed

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If you want to find a package, you can search in the Yum source by searching

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You can remove a package with remove

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Can be installed through install, he will automatically resolve the dependency

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The update package is available through the update

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If you only want to download the package without installing, you can specify the download and download path

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Confirm Download Success

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If you forget what package the software is installed in, you can check it by whatprovides

For example, the SCP service is installed through the OpenSSH package.

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Viewing yum sources can be done via repolist

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Query, install the time can be manually shielded installation source

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You can also view the package information through info

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Some feature-similar packages are placed in a group and can be viewed through Yum grouplist

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The entire group can be installed directly via Groupinstall

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Some third-party packages can also be downloaded via the Internet, such as pkgs.org

Not to be continued ...

How do I create a source to handle related dependencies?

This article is from the "Mapo Tofu" blog, please be sure to keep this source http://beanxyz.blog.51cto.com/5570417/1599105

RHCE Study notes (+) RPM and YUM