Linux software management: RPM management, YUM, building local warehouse, source package management practice

Keywords: Python Linux Operation & Maintenance

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1. Basic overview

1. What is rpm?

The full name of RPM is the abbreviation of RedHat Package Manager, which is developed by red hat for software package installation, upgrade, uninstall and query

2.rpm package name component?

The RPM package is named after - dividing the software into parts bash-4.2.46-28.el7.x86_64.rpm

bash:Software name
4.2.46-28.el7: 4 Is the large version, 2 is the small version, 46 is the number of revisions, 28 is the number of releases, el7 Yes: enterprise linux 7,use linux7 system
x86_64: 64 Bit architecture

3. How to obtain rpm package

When we first started to learn about rpm packages, we suggested using the local CentOS7 image, but in the actual production environment, the rpm packages are obtained through networking( Learn first, you know?)

We first load the image through the virtual machine, and then execute mount /dev/cdrom /mnt in linux. At this time, you will see many rpm package files in the / mnt/Packages directory. Then you can start the journey of rpm package management.

4. Expansion: in addition to rpm installation software in Linux, is there another way to install software?

classificationinstalledition
rpm packagePre compiled and packaged, easy installationLow software version
Source packageManual compilation and packaging, cumbersome installationThe software version is optional
Binary package (green package)Decompression can be used, easy to installThe source code cannot be modified

2.RPM usage example

1. How to install RPM package

The following lists the common parameters for installing software with the rpm command

optiondescribe
-iInstall rpm
-vDisplay installation details
-hDisplay installation progress
–forceForce reinstallation
–nodepsIgnore dependencies
#To install the software package, you need to specify the absolute path of the software package
# mount /dev/cdrom /mnt
[root@lqz ~]# rpm -ivh /mnt/Packages/tree-1.6.0-10.el7.x86_64.rpm
[root@lqz ~]# rpm -ivh /mnt/Packages/vsftpd-3.0.2-22.el7.x86_64.rpm

#The absolute path can not be specified in the directory where the software package is located
[root@lqz ~]# cd /mnt/Packages/
[root@lqz Packages]# rpm -ivh zsh-5.0.2-28.el7.x86_64.rpm

#If the package exists, force it to be installed again
[root@lqz ~]# rpm -ivh --force /mnt/Packages/tree-1.5.3-3.el6.x86_64.rpm

#Installing samba service depends on other components. Use -- nodeps to force the installation again
[root@lqz ~]# rpm -ivh --nodeps  /mnt/Packages/tree-1.6.0-10.el7.x86_64.rpm
# yum setup automatically handles dependencies

# For other uses, use the connection address directly
# https://developer.aliyun.com/mirror/
# https://developer.aliyun.com/mirror/zabbix?spm=a2c6h.13651102.0.0.3e221b113DCKcf
# https://mirrors.aliyun.com/zabbix/zabbix/
# Install 3 first and then 4 to test and upgrade
# zabbix-agent-3.0.9-1.el7.x86_64.rpm 
[root@lqz ~]#  rpm -ivh https://mirrors.aliyun.com/zabbix/zabbix/3.0/rhel/7/x86_64/zabbix-agent-3.0.9-1.el7.x86_64.rpm
# Upgrade with U
[root@lqz ~]# rpm -Uvh https://mirrors.aliyun.com/zabbix/zabbix/4.2/rhel/7/x86_64/zabbix-agent-4.2.8-1.el7.x86_64.rpm

# Unload (cannot unload with dependency)
rpm -e zabbix-agent
rpm -q zabbix-agent

yum remove samba

2. How to query the installed rpm package

optiondescribe
rpm -qCheck whether the specified software package is installed (key)
rpm -qaView a list of all RPM packages installed in the system
rpm -qiView details of the specified software
rpm -qlQuery the directory and file list of the specified software package (key)
rpm -qcQuery the configuration file of the specified software package (only the configuration file, etc)
rpm -qfQuery which RPM software the file or directory belongs to
rpm -qipQuery the details of uninstalled rpm packages
rpm -qlpQuery which files will be generated by uninstalled packages
#Query vsftpd whether the rpm package is installed
[root@lqz ~]# rpm -q vsftpd

#Fuzzy Lookup system installed rpm package
[root@lqz ~]# rpm -qa |grep ftp

#Query vsftpd package related information
[root@lqz ~]# rpm -qi vsftpd

#Query the files installed by the rpm package
[root@lqz ~]# rpm -ql vsftpd

#Query the configuration files related to the rpm package
[root@lqz ~]# rpm -qc vsftpd

#Query which rpm package the configuration file or command comes from (only those installed)
[root@lqz ~]# rpm -qf /etc/vsftpd/vsftpd.conf # View this configuration file is
[root@lqz ~]# rpm -qf /usr/sbin/vsftpd
[root@lqz ~]# rpm -qf /usr/sbin/ifconfig 
# Want to see what's not installed
yum provides vim

#Query which files will be generated by uninstalled packages
[root@lqz ~]# rpm -qlp /mnt/Packages/samba-3.6.23-41.el6.x86_64.rpm

#Query which files will be generated by uninstalled packages
[root@lqz ~]# rpm -qip /mnt/Packages/samba-3.6.23-41.el6.x86_64.rpm

3.RPM package upgrade

optiondescribe
rpm -UIf the old version does not exist, install it completely. If there is a new version, upgrade it
# wget  https://mirrors.aliyun.com/zabbix/zabbix/3.0/rhel/7/x86_64/zabbix-agent-3.0.9-1.el7.x86_64.rpm
# wget  https://mirrors.aliyun.com/zabbix/zabbix/4.2/rhel/7/x86_64/zabbix-agent-4.2.0-1.el7.x86_64.rpm

#1. Install the lower version first
[root@www.lqz.com ~]# rpm -ivh zabbix-agent-3.0.9-1.el7.x86_64.rpm
        
#2. Try to install a higher version (an error will occur)
[root@www.lqz.com ~]# rpm -ivh zabbix-agent-4.2.0-1.el7.x86_64.rpm
        
#3. Use the upgrade method to perfectly solve the replacement problem
[root@www.lqz.com ~]# rpm -Uvh zabbix-agent-4.2.0-1.el7.x86_64.rpm

4.RPM package unloading

When uninstalling a package, you need to uninstall the dependent package first. If the dependent package is necessary for the system, you cannot uninstall the package, otherwise the system will crash.

#Query first and then uninstall 
[root@www.lqz.com ~]# rpm -qa |grep sh
[root@www.lqz.com ~]# rpm -e zsh

5.RPM package verification (extended understanding)

The software related databases are stored in the / var/lib/rpm directory

parameterdescribe
SIs the file size changed
MWhether the file type or file attribute has been modified
5The content of MD5 fingerprint encryption is different
LThe path has been changed
UThe owner of the file has been modified
GThe group to which the file belongs has been modified
TThe creation time of the file has been changed
[root@www.lqz.com ~]# rpm -V vsftpd
S.5....T.  c /etc/pam.d/vsftpd
.......T.  c /etc/vsftpd/ftpusers
S.5....T.  c /etc/vsftpd/vsftpd.conf
.M.......    /var/ftp/pub

6.RPM package summary

How to query which files are installed in util Linux package?

How to query which RPM package installed the mkdir command?

What is the difference between the - i, - U, and options when installing the. rpm package?

3. Basic introduction to yum

1. What is YUM

Yum is the package manager in RedHat and CentOS. The. rpm package can be downloaded and installed through the Internet, and the dependency relationship can be handled automatically without cumbersome downloading and installation again and again( PS: YUM is a production best practice)

2. What is the yum source

1 to successfully use Yum tool to install update software or system, we need a repository (software warehouse) containing various rpm software packages. This software warehouse is commonly called Yum source( Can be local source, network source)

3.YUM source configuration example

1. Alibaba yum source

# yum repolist # Check how many sources there are now. Nginx does not exist. You can configure the nginx warehouse
# Extended epel source:
[root@www.lqz.com ~]# wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo



#The default system is a foreign source and needs to be replaced with a domestic source
[root@www.lqz.com ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo 
http://mirrors.aliyun.com/repo/Centos-7.repo

#Extended source, there are many software not available in the basic source
[root@www.lqz.com ~]# wget -O /etc/yum.repos.d/epel.repo 
http://mirrors.aliyun.com/repo/epel-7.repo

2.Nginx official source. For example, when learning nginx, you need to use the official yum source to install it

[root@www.lqz.com ~]# vim /etc/yum.repos.d/nginx.repo
[nginx]
name=nginx repo 
baseurl=http://nginx.org/packages/centos/7/$basearch/ 
gpgcheck=0
enabled=1

PS: the source search methods are basically the same, zabbix, Docker, Nginx, saltstack and openstack

4.YUM practice case

1. Query the package using yum

[root@www.lqz.com ~]# yum list
[root@www.lqz.com ~]# yum list|grep ftp
[root@www.lqz.com ~]# yum info ftp

2. Install the package using yum

[root@www.lqz.com ~]# yum install tree
[root@www.lqz.com ~]# yum install tree -y    #Non interactive

#Install the local rpm package. If there are dependencies, the required dependencies will be automatically downloaded from the software warehouse
[root@www.lqz.com ~]# yum localinstall /mnt/Packages/bind-9.9.4-50.el7.x86_64.rpm

#Directly install the rpm package on the network
[root@www.lqz.com ~]# yum install http://repo.zabbix.com/zabbix/3.4/rhel/7/x86_64/zabbix-release-3.4-2.el7.noarch.rpm

3. Reinstall the package using yum or up2date

#1. If you accidentally delete the vsftpd configuration file
[root@www.lqz.com ~]# rm -f /etc/vsftpd/vsftpd.conf

#2. The software can be reinstalled
[root@www.lqz.com ~]# yum reinstall vsftpd

#3. Check the configuration file of the software
[root@www.lqz.com ~]# rpm -qc vsftpd
/etc/logrotate.d/vsftpd
/etc/pam.d/vsftpd
/etc/vsftpd/ftpusers
/etc/vsftpd/user_list
/etc/vsftpd/vsftpd.conf

4 update the package using yum or up2date

#Compare the installed Linux software with the software in the yum warehouse. What needs to be upgraded
[root@www.lqz.com ~]# yum check-update

#Update acl software
[root@www.lqz.com ~]#  yum update acl -y

#The following execution is dangerous, which means updating all the software of the whole system, including the kernel
[root@www.lqz.com ~]#  yum update -y

5. Delete the package using yum or up2date

[root@www.lqz.com ~]# yum install samba -y
[root@www.lqz.com ~]# yum erase samba -y
[root@www.lqz.com ~]# yum remove samba -y

6. Instructions related to yum warehouse (extended understanding)

#Lists the software warehouses available from yum source
[root@www.lqz.com ~]# yum repolist

#Lists the available and disabled warehouses for all yum sources
[root@www.lqz.com ~]# yum repolist all

#Find which package a command or file belongs to (commonly used in production)
[root@www.lqz.com ~]# yum provides /etc/my.cnf
[root@www.lqz.com ~]# yum provides cd

7. Instructions related to yum cache (extended understanding)

#1. Cache rpm package mode 1. Modify yum global configuration file
[root@www.lqz.com ~]# vim /etc/yum.conf
[main]
cachedir=/var/cache/yum/$basearch/$releasever
keepcache=1     #Start cache

#2. Cache rpm package mode 2, only download but not install
[root@www.lqz.com ~]# yum install -y yum-plugin-downloadonly #plug-in unit
[root@www.lqz.com ~]# yum install httpd -y --downloadonly --downloaddir=/tmp

#3. Clear all yum cached packages and metadata
[root@www.lqz.com ~]# yum clean all

#4. Clear only cached packages
[root@www.lqz.com ~]# yum clean packages

8. Package related instructions, (extended understanding)

[root@www.lqz.com ~]# yum groups list
#Install an entire set of software
[root@lqz ~]# yum groups install Development tools 
Compatibility libraries 
Base Debugging Tools

#Delete package group using yum or up2date
[root@www.lqz.com ~]# yum groups remove  -y Base

9. History command, (extended understanding)

#1. View the history and execute the yum command
[root@www.lqz.com ~]# yum history

#2. Query historical execution yum command ID details
[root@www.lqz.com ~]# yum history info N

#3. Undo historically executed yum commands
[root@www.lqz.com ~]# yum history undo N

PS: YUM also has configuration files and signature verification that we need to extend to understand Please click the portal

5. Build local warehouse

1. Sometimes your linux system can't be connected to the Internet. Of course, you can't easily use the connected yum source. At this time, you need to make a yum source by using the linux system CD. The specific steps are as follows:

#1. Mount the image
[root@lqz ~]# mount /dev/cdrom /mnt   

#2. Back up the original warehouse
[root@lqz ~]# gzip /etc/yum.repos.d/

#3. Add the local warehouse using the yum config manager command
[root@lqz ~]# yum-config-manager --add-repo="file:///mnt"

#4. Or add the repo file manually
[root@lqz ~]# vim /etc/yum.repos.d/cdrom.repo  
[cdrom]      
name=This is local cdrom
baseurl=file:///mnt
enabled=1
gpgcheck=0

[]          #Warehouse name
name        3 Warehouse description information
baseurl     #YUM source url address, which can be file:// ftp:// http://
enabled     #Whether to use this YUM source (0 = disabled, 1 = active)
gpgcheck    #Verify software signature (0 = disabled, 1 = active)

#5. Generate cache
[root@lqz ~]# yum makecache

2. Many times, not only one machine can't access the Internet, but many machines can't access the Internet, but there is a need to download software online. At this time, is every machine hung on the CD? Sure, but what if the software is updated?


Basic software package provided on local CD: Base

yum cache provides common software packages: nginx, zabbix, docker

1. Environmental preparation

systemIProle
centos710.0.0.99yum warehouse server
centos710.0.0.98yum warehouse client

2. The server prepares to build the yum warehouse

#1. Close the firewall and selinux
[root@yum_server ~]# systemctl stop firewalld
[root@yum_server ~]# setenforce 0

#2. Install ftp service, start and join startup
[root@yum_server ~]# yum -y install vsftpd 
[root@yum_server ~]# systemctl start vsftpd 
[root@yum_server ~]# systemctl enable vsftpd

#3. Enable the yum cache function
[root@yum_server ~]# vim /etc/yum.conf
[main] cachedir=/var/cache/yum/$basearch/$releasever 
keepcache=1
[root@yum_server ~]# yum clean all

#4. Provide basic base software package
[root@yum_server ~]# mkdir /var/ftp/centos7
[root@yum_server ~]# mount /dev/cdrom /mnt
[root@yum_server ~]# cp -rp  /mnt/Packages/.rpm /var/ftp/centos7/

#5. Provide third-party sources
[root@yum_server ~]# mkdir /var/ftp/ops
[root@yum_server ~]# yum -y install nginx docker

#6. Copy the cached Nginx docker and dependent packages to the custom YUM warehouse directory
[root@yum_server_69_112 ~]# find /var/cache/yum/x86_64/7/ 
-iname ".rpm" -exec cp -rf {} /var/ftp/ops ;

#7. Install createrepo and create reopdata repository
[root@yum_server_ ~]# yum -y install createrepo
[root@yum_server_ ~]# createrepo /var/ftp/ops

#PS: if the warehouse adds software every time, it needs to be regenerated

3. Configure the yum source on the client to point to the server

#1. The client configures and uses the base basic source
[root@yum_client ~]# gzip /etc/yum.repos.d/
[root@yum_client ~]# vim /etc/yum.repos.d/centos7.repo 
[centos7]
name=centos7_base
baseurl=ftp://10.0.0.99/centos7
gpgcheck=0

#2. The client configures and uses the ops source
[root@yum_client ~]# vim /etc/yum.repos.d/ops.repo 
[ops]
name=local ftpserver
baseurl=ftp://10.0.0.99/ops
gpgcheck=0

6. Source package management practice

1. What is the source package

Source code package refers to the development of written program source code, but it is not compiled into a normal tool.

2. Why learn the source code package

1. Some software official websites only provide source packages, which need to be compiled and installed by themselves.

2. When some software has some features in the new version and has not been made into rpm package in time, you can compile the software by yourself to use its new features.

3. Advantages and disadvantages of source package

1. You can modify the source code yourself

2. Relevant functions required can be customized

3. The source code of the new version of software shall be updated first

4. The disadvantages are: 1) it is much more complicated to install software than yum. 2) If it is difficult to implement standardization, automation cannot be implemented.

4. How to obtain the source code package

Common software packages can be obtained from the official website, such as apache, nginx, mysql and so on

5 the steps to compile the source package into binary executable files are as follows, which is referred to as the installation three-step program for short

PS: this method is not 100% common for all source packages. It is recommended to unzip the source package and go to the directory to find the relevant README help documents

6. Source code compilation example

Let's learn more about the compilation process of the source package by compiling Nginx.

#1. Basic environmental preparation
[root@node1 ~]# yum install -y gcc make wget 

#2. Download the source package
[root@node1 ~]# wget http://nginx.org/download/nginx-1.15.12.tar.gz

#3. Unzip the source package and enter the corresponding directory
[root@node1 ~]# tar xf nginx-1.15.12.tar.gz
[root@node1 ~]# cd nginx-1.15.12

#4. Configure relevant options and generate Makefile
[root@node1 nginx-1.15.12]# ./configure --help
[root@node1 nginx-1.15.12]# ./configure --prefix=/usr/local/nginx
[root@node1 nginx-1.15.12]# echo $? # Check whether the previous command was executed successfully

#5. Compile the Makefile file into the executable binary program. At this time, the / usr/local/nginx executable file is not available. You need to execute make install to copy it
[root@node1 nginx-1.15.12]# make

#6. Copy the binary file to the corresponding directory
[root@node1 nginx-1.15.12]# make install

#7. Establish soft connection (easy to upgrade in the future)
[root@node1 nginx-1.15.12]# ln -s nginx-1.18.0 nginx

#8 catalog introduction
conf:configuration file
html: Website file storage
logs: journal
sbin:Executable file

# 9 command
nginx  # start-up
nginx -s reload # Reload
nginx -s stop  # restart
nginx -s stop # stop it

Source code compilation error information processing

checking for C compiler ... not found ./configure: error: C compiler cc is not found 
# yum -y install gcc gcc-c++ make


./configure: error: the HTTP rewrite module requires the PCRE library.
You can either disable the module by using --without-http_rewrite_module
option, or install the PCRE library into the system, or build the PCRE library
statically from the source with nginx by using --with-pcre=<path> option.
# yum install -y pcre-devel


./configure: error: the HTTP gzip module requires the zlib library.
You can either disable the module by using --without-
http_gzip_module option, or install the zlib library into the
system, or build the zlib library statically from the source with
nginx by using --with-zlib=<path> option. 
# yum -y install zlib-devel


./configure: error: SSL modules require the OpenSSL library.
You can either do not enable the modules, or install the OpenSSL 
library into the system, or build the OpenSSL library statically
from the source with nginx by using --with-openssl=<path> option.
# yum -y install openssl-devel

tall the zlib library into the
system, or build the zlib library statically from the source with
nginx by using --with-zlib=<path> option. 
# yum -y install zlib-devel


./configure: error: SSL modules require the OpenSSL library.
You can either do not enable the modules, or install the OpenSSL 
library into the system, or build the OpenSSL library statically
from the source with nginx by using --with-openssl=<path> option.
# yum -y install openssl-devel

Posted by DRTechie on Mon, 06 Sep 2021 10:39:25 -0700