yum&&rpm

1. what is yum and rpm

rpm is redhat package manager yum: yellow dog updater,modified

same: they both package manage

difference: rpm in low level;

yum in high level; yum can resolve dependency

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========================
 Package                       Arch        Version                    Repository      Size
=============================================================
Installing:
 java-11-openjdk-devel         x86_64      1:11.0.11.0.9-2.el8_4      
Installing dependencies:
 adwaita-cursor-theme          noarch      3.28.0-2.el8               appstream      647 k

rpm repository

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[elasticsearch-7.x]
name=Elasticsearch repository for 7.x packages
baseurl=https://artifacts.elastic.co/packages/7.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md

gpg

1. what is gpg? Gnu privacy guard; contain publicKeys

2. gpgKey gpgKey is a public key to verify package;

3. gpkey command

   1	rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch

2. how to install repo

1.install by yum

auto install dependency

1. create repo file： in /et/yum.repos.d directly

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   [mongodb-org-4.4] name=MongoDB Repository baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.4/x86_64/ gpgcheck=1 enabled=1 gpgkey=https://www.mongodb.org/static/pgp/server-4.4.asc

2. instal by yum

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yum install <package>

2. install by rpm

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wget xxxx.rpm
rpm rpm -ivh  <package>

3.yum command

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yum repolist # list all repo

yum install
yum reinstall
yum remove
yum update
yum search
yum  list

yum list | less
yum list installed | less

1. update vs upgrade:

   1. same: update packages to the lastes version;
   2. differ: upgrade = update –obsolete –obsolete: remove the obsolete depency;

2. apt update vs yum update: apt update: only refresh local index files,not actual update a package;

yum vs apt

package metadata

1. name
2. description
3. download url
4. newVersion list

the package metedata:

1. apt: manually , excute apt update
2. yum: auto load

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everfy n seconds:
	yum load info to local data
		1. repository's version list
		2. other info 

yum clean cache

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yum clean all
yum makecache

yum install:

1. load metadat from local
2. if not install, install; else, upgrader it

yum commad

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yum installed list // list all installed 
yum repolist