Installation of Yum source for Linux package management

The Yum source installation is a common approach in our work, which is the RPM-based package manager in Fedora and Redhat and SuSE, which enables system managers to interact and automate the finer and more granular management of RPM packages, to automatically download RPM packs and install them from specified servers, Dependency relationships can be automatically handled and all dependent software packages are installed at once, without the hassle of downloading and installing them over and over again.

In CentOS7 there is also a more innovative installation method (DNF installation), this chapter is mainly about Yum installation. We must master the Yum command before installing the Yum source. Let's talk about the use of the Yum command and the Yum source installation.

I. Usage of the YUM command

The syntax format for the yum command: Yum [options] [command] [package ...]

[Options]

-Y: Answer "yes" to all questions " -C,--config=[config file]: Specify profile -Q: Quiet installation mode -V: Verbose installation mode -D: Set debug Level (0-10) - E: Set Error level (0-10) -R: Sets the maximum wait time for Yum to process a command; -C: Run completely from the cache without downloading or updating any header files -H: Display Help information--nogpgcheck: No GPG check is allowed; --disablerepo=repoidglob: Temporarily disables the repo specified here --enablerepo=repoidglob: Temporarily enable the repo specified here --noplugins: Disable all plugins

[Command]

Show Warehouse List Repolist [all|enabled|disabled]

Show Packages: List list [All | glob_exp1] [GLOB_EXP2] [...] list {available|installed|updates} [GLOB_EXP1] [...]

To install the package: Install Package1 [Package2] [...] Reinstall Package1 [Package2] [...] (reinstall)

Upgrade Package: Update [PACKAGE1] [Package2] [...] Downgrade Package1 [Package2] [...] Downgrade

Check for available upgrades: Check-update

To uninstall a package: Remove | Erase Package1 [Package2] [...]

To view the package information: info [...]

View which package is provided by the specified attribute (which can be a file): provides | Whatprovides Feature1 [Feature2] [...]

To clean up the local cache: Clean [Packages | metadata | expire-cache | rpmdb | plugins | all] All: Clear the cache directory of the package and the old headers Packages: Clear the package from the cache directory Headers: Clear headers in cache directory Metadata: Clear Metadata Expire-cache: Clear Stale cache Rpmdb: Working with databases Plugins: Clear Plugins

Build cache: Makecache

Search Package: Search string1 [string2] [...] [Search for Package name and brief information with specified keywords]

View the capabilities that the specified package depends on: Deplist Package1 [Package2] [...]

View Yum Transaction history: History [Info|list|packages-list|packages-info|summary|addon-info|redo|undo|rollback|new|sync|stats]

To install and upgrade the local package: * Localinstall Rpmfile1 [rpmfile2] [...] (Maintained for legacy reasons Only-use install) * Localupdate Rpmfile1 [rpmfile2] [...] (Maintained for legacy reasons Only-use Update)

Related commands for package group management: * Groupinstall group1 [group2] [...] * Groupupdate group1 [group2] [...] * grouplist [hidden] [Groupwildcard] [...] * Groupremove group1 [group2] [...] * GroupInfo group1 [...]

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Second, the Yum Warehouse building complementary knowledge points "to understand the Yum command and the establishment of the Yum warehouse is very important"

1. What is a cloud warehouse? What is the Repodata file inside the Yum warehouse?

Yum Repository: Stores a wide range of RPM packages and related metadata files for packages (placed in a specific directory)

Repodata files: To put related metadata, such as the bread dependency in the Yum warehouse.

2, yum Client configuration file in detail (man yum.conf inside is detailed)

/etc/yum.conf: is a configuration that provides a public configuration for all warehouses "or is not a repository, that is, the configuration of the Yum command" /etc/yum.repos.d/*.repo: Provides configuration for the point of the warehouse Detailed description of warehouse point definition: [Repositoryid] Name=some name for this repository baseurl=url://path/to/repository/ Enabled={1|0} Gpgcheck={1|0} Gpgkey=url Repo-gpgcheck the source legitimacy of the GPG information for checking meta data ENABLEGROUPS={1|0} whether to bulk manage packages based on groups Failovermethod={roundrobin|priority} Fail-Over method The default is: Roundrobin, meaning random selection; Cost= Overhead Default is 1000 Bandwidt indicates the time-length bandwidth Username Password Note: The configuration file has been modified to enable the configuration file first: Yum repolist

3. Create a Yum Warehouse summary:

(1) package the package under a directory (2) Creating a metadata file: Createrepo [options] <directory> (3) Create signature: Createrepo file [file is a folder to put the package, he will automatically generate the public Secretary] (4) Edit configuration file:/etc/yum.repos.d/centos-base.repo (5) Run command to get all packages via config file: Yum repolist (6) Install the local package directly

Installation of Yum source for Linux package management