镜像定制内容：

• 定制镜像内容
• 基于官方镜像minimal版定制

• 禁用自带的 nouveau nvidia驱动(Linux安装显卡驱动免重启即时生效),为自动化部署脚本提供便携.

检查方式:

[root@localhost ~]# cat /etc/modprobe.d/blacklist.conf

blacklist nouveau

[root@localhost ~]#

• 内置5.5.7-1.el7.elrepo.x86_64 内核,去除官方默认自带3.10.0-957.el7.x86_64内核.
• 内置ntfs-3g插件(支持直接插ntfs格式的u盘拷贝)
• 以内置以下常用命令/开发调试工具包

telnet,lrzsz,htop,iftop,git,vim,tree,wget,gcc-c++,openssl-devel,expect,rpm,ntpdate,nmap-ncat,net-tools,unzip,yum-utils,device-mapper-persistent-data,bash-completion,bash-completion-extras,libcurl,openssl,ncurses-devel,gcc,kernel-ml,kernel-ml-devel,kernel-ml-headers,kernel-ml-tools-libs,kernel-ml-tool,kernel-ml-tools-libs-devel

优化Centos系统

1. 更换yum源默认为 阿里源，增加docker-ce国内源CentOS-Base.repo docker-ce.repo epel.repo
2. /etc/rc.local默认给执行权限
3. 优化sshd----------->>> UseDNS no
4. 关闭firewalld防火墙
5. 关闭Selinux开机自启
6. 默认开启命令行tab键补齐功能
7. 内核参数优化如下

准备环境

yum install  createrepo  genisoimage   -y

第一：准备完整的安装镜像CentOS-7，挂载到虚拟机，并同时创建一个用于编辑存放的目录centos7

	mkdir -p /home/centos7
	mount /dev/cdrom /mnt
	
	cd /mnt && ls -l

第二：复制光盘文件到可编辑目录centos7

cp -rfv /mnt/* /home/centos7	

第三：编辑bios引导文件

[root@localhost ~]# cat  /home/centos7/isolinux/isolinux.cfg
default vesamenu.c32
timeout 600

display boot.msg

# Clear the screen when exiting the menu, instead of leaving the menu displayed.
# For vesamenu, this means the graphical background is still displayed without
# the menu itself for as long as the screen remains in graphics mode.
menu clear
menu background splash.png
menu title CentOS 7
menu vshift 8
menu rows 18
menu margin 8
#menu hidden
menu helpmsgrow 15
menu tabmsgrow 13

# Border Area
menu color border * #00000000 #00000000 none

# Selected item
menu color sel 0 #ffffffff #00000000 none

# Title bar
menu color title 0 #ff7ba3d0 #00000000 none

# Press [Tab] message
menu color tabmsg 0 #ff3a6496 #00000000 none

# Unselected menu item
menu color unsel 0 #84b8ffff #00000000 none

# Selected hotkey
menu color hotsel 0 #84b8ffff #00000000 none

# Unselected hotkey
menu color hotkey 0 #ffffffff #00000000 none

# Help text
menu color help 0 #ffffffff #00000000 none

# A scrollbar of some type? Not sure.
menu color scrollbar 0 #ffffffff #ff355594 none

# Timeout msg
menu color timeout 0 #ffffffff #00000000 none
menu color timeout_msg 0 #ffffffff #00000000 none

# Command prompt text
menu color cmdmark 0 #84b8ffff #00000000 none
menu color cmdline 0 #ffffffff #00000000 none

# Do not display the actual menu unless the user presses a key. All that is displayed is a timeout message.

menu tabmsg Press Tab for full configuration options on menu items.

menu separator # insert an empty line
menu separator # insert an empty line

label linux
  menu label ^Install CentOS 7.7 ( Kernel-5.5.7-1)
  kernel vmlinuz
  append initrd=initrd.img inst.stage2=hd:LABEL=CentOS7 quiet

label check
  menu label Test this ^media & install CentOS 7
  menu default
  kernel vmlinuz
  append initrd=initrd.img inst.stage2=hd:LABEL=CentOS\x207\x20x86_64 rd.live.check quiet

menu separator # insert an empty line

# utilities submenu
menu begin ^Troubleshooting
  menu title Troubleshooting

label vesa
  menu indent count 5
  menu label Install CentOS 7 in ^basic graphics mode
  text help
	Try this option out if you're having trouble installing
	CentOS 7.
  endtext
  kernel vmlinuz
  append initrd=initrd.img inst.stage2=hd:LABEL=CentOS\x207\x20x86_64 xdriver=vesa nomodeset quiet

label rescue
  menu indent count 5
  menu label ^Rescue a CentOS system
  text help
	If the system will not boot, this lets you access files
	and edit config files to try to get it booting again.
  endtext
  kernel vmlinuz
  append initrd=initrd.img inst.stage2=hd:LABEL=CentOS\x207\x20x86_64 rescue quiet

label memtest
  menu label Run a ^memory test
  text help
	If your system is having issues, a problem with your
	system's memory may be the cause. Use this utility to
	see if the memory is working correctly.
  endtext
  kernel memtest

menu separator # insert an empty line

label local
  menu label Boot from ^local drive
  localboot 0xffff

menu separator # insert an empty line
menu separator # insert an empty line

label returntomain
  menu label Return to ^main menu
  menu exit

menu end
[root@localhost ~]#

第四：编辑EFI引导文件/home/centos7/EFI/BOOT/grub.cfg

[root@localhost ~]# cat /home/centos7/EFI/BOOT/grub.cfg
set default="1"

function load_video {
  insmod efi_gop
  insmod efi_uga
  insmod video_bochs
  insmod video_cirrus
  insmod all_video
}

load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod ext2

set timeout=60
### END /etc/grub.d/00_header ###

search --no-floppy --set=root -l 'CentOS 7 x86_64'

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Install CentOS 7.7( Kernel-5.5.7-1)' --class fedora --class gnu-linux --class gnu --class os {
	linuxefi /images/pxeboot/vmlinuz inst.stage2=hd:LABEL=CentOS7 quiet
	initrdefi /images/pxeboot/initrd.img
}
}
[root@localhost ~]#

第五：编辑/home/centos7/comps.xml文件增加自定义软件/5.5内核

[root@localhost ~]# cat /home/centos7/comps.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE comps PUBLIC "-//CentOS//DTD Comps info//EN" "comps.dtd">
<comps>
  <group>
    <id>core</id>
    <name>Core</name>
    <name xml:lang="af">Kern</name>
    <name xml:lang="af_ZA">Kern</name>
    <name xml:lang="am">????? ??</name>
    <name xml:lang="ar">?????</name>
    <name xml:lang="as">??????</name>
    <name xml:lang="bal">????</name>
    <name xml:lang="be">Падмурак</name>
    <name xml:lang="bg">Основа</name>
    <name xml:lang="bn">???</name>
    <name xml:lang="bn_IN">???</name>
    <name xml:lang="bs">Jezgra</name>
    <name xml:lang="ca">Nucli</name>
    <name xml:lang="cs">úplny základ</name>
    <name xml:lang="cs_CZ">úplny základ</name>
    <name xml:lang="cy">Craidd</name>
    <name xml:lang="da">Grundl?ggende</name>
    <name xml:lang="de">Kern</name>
    <name xml:lang="de_CH">Kern</name>
    <name xml:lang="el">Πυρ?να?</name>
    <name xml:lang="en_GB">Core</name>
    <name xml:lang="es">Núcleo</name>
    <name xml:lang="es_ES">Núcleo</name>
    <name xml:lang="et">Tuum</name>
    <name xml:lang="fa">???</name>
    <name xml:lang="fa_IR">???</name>
    <name xml:lang="fi">Keskeiset</name>
    <name xml:lang="fr">Core</name>
    <name xml:lang="gl">Núcleo</name>
    <name xml:lang="gu">???</name>
    <name xml:lang="he">????</name>
    <name xml:lang="hi">???</name>
    <name xml:lang="hr">Jezgra</name>
    <name xml:lang="hr_HR">Jezgra</name>
    <name xml:lang="hu">Mag</name>
    <name xml:lang="hy">????</name>
    <name xml:lang="ia">Nucleo</name>
    <name xml:lang="id">Inti</name>
    <name xml:lang="ilo">Bugas</name>
    <name xml:lang="is">Lágmarkskerfi</name>
    <name xml:lang="it">Principale</name>
    <name xml:lang="it_IT">Principale</name>
    <name xml:lang="ja">コア</name>
    <name xml:lang="ja_JP">コア</name>
    <name xml:lang="ka">??????</name>
    <name xml:lang="kn">????????</name>
    <name xml:lang="ko">??</name>
    <name xml:lang="lv">Pamatsistēma</name>
    <name xml:lang="mai">???</name>
    <name xml:lang="mk">Основни</name>
    <name xml:lang="ml">?????</name>
    <name xml:lang="mr">???</name>
    <name xml:lang="ms">Teras</name>
    <name xml:lang="ms_MY">Teras</name>
    <name xml:lang="nb">Kjerne</name>
    <name xml:lang="ne">???</name>
    <name xml:lang="nl">Kern</name>
    <name xml:lang="no">Kjerne</name>
    <name xml:lang="nso">Bogare</name>
    <name xml:lang="or">??????</name>
    <name xml:lang="pa">???</name>
    <name xml:lang="pl">Rdzeń</name>
    <name xml:lang="pt">Núcleo</name>
    <name xml:lang="pt_BR">Núcleo</name>
    <name xml:lang="ro">Nucleu</name>
    <name xml:lang="ru">Основа</name>
    <name xml:lang="ru_RU">Основа</name>
    <name xml:lang="si">?????????</name>
    <name xml:lang="sk">Jadro</name>
    <name xml:lang="sl">Jedro</name>
    <name xml:lang="sq">B?rthama</name>
    <name xml:lang="sr">Срж</name>
    <name xml:lang="sr@latin">Sr?</name>
    <name xml:lang="sr@Latn">Sr?</name>
    <name xml:lang="sv">Grund</name>
    <name xml:lang="ta">????</name>
    <name xml:lang="ta_IN">????</name>
    <name xml:lang="te">?????????</name>
    <name xml:lang="tg">Система</name>
    <name xml:lang="th">???????</name>
    <name xml:lang="tr">?ekirdek</name>
    <name xml:lang="uk">Основа</name>
    <name xml:lang="uk_UA">Основа</name>
    <name xml:lang="ur">????</name>
    <name xml:lang="vi">L?i</name>
    <name xml:lang="zh">核心</name>
    <name xml:lang="zh_CN">核心</name>
    <name xml:lang="zh_TW">核心</name>
    <name xml:lang="zu">Okuyikhona</name>
    <description>Smallest possible installation.</description>
    <description xml:lang="as">??????? ???????</description>
    <description xml:lang="bn">??????? ??????????</description>
    <description xml:lang="bn_IN">??????? ??????????</description>
    <description xml:lang="cs">Nejmen?í mo?ná instalace.</description>
    <description xml:lang="cs_CZ">Nejmen?í mo?ná instalace.</description>
    <description xml:lang="de">Kleinstm?gliche Installation.</description>
    <description xml:lang="de_CH">Kleinstm?gliche Installation.</description>
    <description xml:lang="es">La instalación más peque?a posible.</description>
    <description xml:lang="es_ES">La instalación más peque?a posible.</description>
    <description xml:lang="fr">Plus petite installation possible.</description>
    <description xml:lang="gu">??????? ???? ???? ??????.</description>
    <description xml:lang="hi">????? ??????? ????????.</description>
    <description xml:lang="ia">Le minime possibile installation.</description>
    <description xml:lang="it">Minima installazione possibile.</description>
    <description xml:lang="it_IT">Minima installazione possibile.</description>
    <description xml:lang="ja">最小限のインストール</description>
    <description xml:lang="ja_JP">最小限のインストール</description>
    <description xml:lang="kn">???????????? ??????????.</description>
    <description xml:lang="ko">??? ?? ??</description>
    <description xml:lang="ml">???????? ??????? ????? ???????????????.</description>
    <description xml:lang="mr">??????? ?????? ???? ???????????.</description>
    <description xml:lang="or">????????? ???????? ????????</description>
    <description xml:lang="pa">????-??? ???? ??????????</description>
    <description xml:lang="pl">Najmniejsza mo?liwa instalacja.</description>
    <description xml:lang="pt_BR">Menor instala??o possível</description>
    <description xml:lang="ru">Минимально возможная установка</description>
    <description xml:lang="ru_RU">Минимально возможная установка</description>
    <description xml:lang="sv">Minsta m?jliga installation</description>
    <description xml:lang="ta">????? ????? ?????????????????? ???????.</description>
    <description xml:lang="ta_IN">????? ????? ?????????????????? ???????.</description>
    <description xml:lang="te">???????? ???????? ????????.</description>
    <description xml:lang="uk">М?н?мально можливе встановлення.</description>
    <description xml:lang="uk_UA">М?н?мально можливе встановлення.</description>
    <description xml:lang="zh">最小型安裝。</description>
    <description xml:lang="zh_CN">最小可能安装。</description>
    <description xml:lang="zh_TW">最小型安裝。</description>
    <default>false</default>
    <uservisible>false</uservisible>
    <packagelist>
      <packagereq type="mandatory">audit</packagereq>
      <packagereq type="mandatory">basesystem</packagereq>
      <packagereq type="mandatory">bash</packagereq>
      <packagereq type="mandatory">btrfs-progs</packagereq>
      <packagereq type="mandatory">coreutils</packagereq>
      <packagereq type="mandatory">cronie</packagereq>
      <packagereq type="mandatory">curl</packagereq>
      <packagereq type="mandatory">dhclient</packagereq>
      <packagereq type="mandatory">e2fsprogs</packagereq>
      <packagereq type="mandatory">filesystem</packagereq>
      <packagereq type="mandatory">firewalld</packagereq>
      <packagereq type="mandatory">glibc</packagereq>
      <packagereq type="mandatory">hostname</packagereq>
      <packagereq type="mandatory">initscripts</packagereq>
      <packagereq type="mandatory">iproute</packagereq>
      <packagereq type="mandatory">iprutils</packagereq>
      <packagereq type="mandatory">iptables</packagereq>
      <packagereq type="mandatory">iputils</packagereq>
      <packagereq type="mandatory">irqbalance</packagereq>
      <packagereq type="mandatory">kbd</packagereq>
      <packagereq type="mandatory">kexec-tools</packagereq>
      <packagereq type="mandatory">less</packagereq>
      <packagereq type="mandatory">man-db</packagereq>
      <packagereq type="mandatory">ncurses</packagereq>
      <packagereq type="mandatory">openssh-clients</packagereq>
      <packagereq type="mandatory">openssh-server</packagereq>
      <packagereq type="mandatory">parted</packagereq>
      <packagereq type="mandatory">passwd</packagereq>
      <packagereq type="mandatory">plymouth</packagereq>
      <packagereq type="mandatory">policycoreutils</packagereq>
      <packagereq type="mandatory">procps-ng</packagereq>
      <packagereq type="mandatory">rootfiles</packagereq>
      <packagereq type="mandatory">rpm</packagereq>
      <packagereq type="mandatory">rsyslog</packagereq>
      <packagereq type="mandatory">selinux-policy-targeted</packagereq>
      <packagereq type="mandatory">setup</packagereq>
      <packagereq type="mandatory">shadow-utils</packagereq>
      <packagereq type="mandatory">sudo</packagereq>
      <packagereq type="mandatory">systemd</packagereq>
      <packagereq type="mandatory">tar</packagereq>
      <packagereq type="mandatory">tuned</packagereq>
      <packagereq type="mandatory">util-linux</packagereq>
      <packagereq type="mandatory">vim-minimal</packagereq>
      <packagereq type="mandatory">xfsprogs</packagereq>
      <packagereq type="mandatory">yum</packagereq>
      <packagereq type="default">aic94xx-firmware</packagereq>
      <packagereq type="default">alsa-firmware</packagereq>
      <packagereq type="default">biosdevname</packagereq>
      <packagereq type="default">dracut-config-rescue</packagereq>
      <packagereq type="default">ivtv-firmware</packagereq>
      <packagereq type="default">iwl100-firmware</packagereq>
      <packagereq type="default">iwl1000-firmware</packagereq>
      <packagereq type="default">iwl105-firmware</packagereq>
      <packagereq type="default">iwl135-firmware</packagereq>
      <packagereq type="default">iwl2000-firmware</packagereq>
      <packagereq type="default">iwl2030-firmware</packagereq>
      <packagereq type="default">iwl3160-firmware</packagereq>
      <packagereq type="default">iwl3945-firmware</packagereq>
      <packagereq type="default">iwl4965-firmware</packagereq>
      <packagereq type="default">iwl5000-firmware</packagereq>
      <packagereq type="default">iwl5150-firmware</packagereq>
      <packagereq type="default">iwl6000-firmware</packagereq>
      <packagereq type="default">iwl6000g2a-firmware</packagereq>
      <packagereq type="default">kernel-tools</packagereq>
      <packagereq type="default">iwl6000g2b-firmware</packagereq>
      <packagereq type="default">iwl6050-firmware</packagereq>
      <packagereq type="default">iwl7260-firmware</packagereq>
      <packagereq type="default">iwl7265-firmware</packagereq>
      <packagereq type="default">libsysfs</packagereq>
      <packagereq type="default">linux-firmware</packagereq>
      <packagereq type="default">lshw</packagereq>
      <packagereq type="default">microcode_ctl</packagereq>
      <packagereq type="default">NetworkManager</packagereq>
      <packagereq type="default">NetworkManager-team</packagereq>
      <packagereq type="default">NetworkManager-tui</packagereq>
      <packagereq type="default">postfix</packagereq>
      <packagereq type="default">sg3_utils</packagereq>
      <packagereq type="default">sg3_utils-libs</packagereq>
      <packagereq type="optional">dracut-config-generic</packagereq>
      <packagereq type="optional">dracut-fips</packagereq>
      <packagereq type="optional">dracut-fips-aesni</packagereq>
      <packagereq type="optional">dracut-network</packagereq>
      <packagereq type="optional">initial-setup</packagereq>
      <packagereq type="optional">openssh-keycat</packagereq>
      <packagereq type="optional">rdma-core</packagereq>
      <packagereq type="optional">selinux-policy-mls</packagereq>
      <packagereq type="optional">tboot</packagereq>
      <packagereq type="mandatory">lrzsz</packagereq>
      <packagereq type="mandatory">tree</packagereq>
      <packagereq type="mandatory">wget</packagereq>
      <packagereq type="mandatory">gcc-c++</packagereq>
      <packagereq type="mandatory">openssl-devel</packagereq>
      <packagereq type="mandatory">expect</packagereq>
      <packagereq type="mandatory">rpm</packagereq>
      <packagereq type="mandatory">ntpdate</packagereq>
      <packagereq type="mandatory">nmap-ncat</packagereq>
      <packagereq type="mandatory">net-tools</packagereq>
      <packagereq type="mandatory">ntfs-3g</packagereq>
      <packagereq type="mandatory">telnet</packagereq>
      <packagereq type="mandatory">ntfs-3g</packagereq>
      <packagereq type="mandatory">iotop</packagereq>
      <packagereq type="mandatory">yum-utils</packagereq>
      <packagereq type="mandatory">device-mapper-persistent-data</packagereq>
      <packagereq type="mandatory">bash-completion</packagereq>
      <packagereq type="mandatory">bash-completion-extras</packagereq>
      <packagereq type="mandatory">kernel-ml-devel</packagereq>
      <packagereq type="mandatory">kernel-ml</packagereq>
      <packagereq type="mandatory">kernel-ml-headers</packagereq>
      <packagereq type="mandatory">libcurl</packagereq>
      <packagereq type="mandatory">openssl</packagereq>
      <packagereq type="mandatory">unzip</packagereq>
      <packagereq type="mandatory">ncurses-devel</packagereq>
      <packagereq type="mandatory">htop</packagereq>
      <packagereq type="mandatory">pbzip2</packagereq>
      <packagereq type="mandatory">hdparm</packagereq>
      <packagereq type="mandatory">dmidecode</packagereq>
      <packagereq type="mandatory">pciutils</packagereq>
      <packagereq type="mandatory">iftop</packagereq>
      <packagereq type="mandatory">git</packagereq>
      <packagereq type="mandatory">centos7init</packagereq>
    </packagelist>
  </group>
<environment>
    <id>minimal</id>
    <name>Minimal Install</name>
    <name xml:lang="as">??????? ??????</name>
    <name xml:lang="cs">Minimální instalace</name>
    <name xml:lang="cs_CZ">Minimální instalace</name>
    <name xml:lang="de">Minimale Installation</name>
    <name xml:lang="de_CH">Minimale Installation</name>
    <name xml:lang="es">Instalación mínima</name>
    <name xml:lang="es_ES">Instalación mínima</name>
    <name xml:lang="fr">Installation minimale</name>
    <name xml:lang="gu">??????? ??????</name>
    <name xml:lang="hi">??????? ????????</name>
    <name xml:lang="it">Installazione minima</name>
    <name xml:lang="it_IT">Installazione minima</name>
    <name xml:lang="ja">最小限のインストール</name>
    <name xml:lang="ja_JP">最小限のインストール</name>
    <name xml:lang="kn">?????? ??????????</name>
    <name xml:lang="ko">?? ??</name>
    <name xml:lang="ml">??????? ?????? ?????????????</name>
    <name xml:lang="mr">????? ???????</name>
    <name xml:lang="or">????????? ??????</name>
    <name xml:lang="pa">??? ??? ??? ??????</name>
    <name xml:lang="pl">Minimalna instalacja</name>
    <name xml:lang="pt">Instala??es Mínimas</name>
    <name xml:lang="pt_BR">Instala??es Mínimas</name>
    <name xml:lang="ru">Минимальная установка</name>
    <name xml:lang="ru_RU">Минимальная установка</name>
    <name xml:lang="ta">??????????? ???????</name>
    <name xml:lang="ta_IN">??????????? ???????</name>
    <name xml:lang="te">?????? ????????</name>
    <name xml:lang="uk">М?н?мальна система</name>
    <name xml:lang="uk_UA">М?н?мальна система</name>
    <name xml:lang="zh">最小型安裝</name>
    <name xml:lang="zh_CN">最小安装</name>
    <name xml:lang="zh_TW">最小型安裝</name>
    <description>Basic functionality.</description>
    <description xml:lang="as">???? ?????????????</description>
    <description xml:lang="cs">Základní funkcionalita.</description>
    <description xml:lang="cs_CZ">Základní funkcionalita.</description>
    <description xml:lang="de">Grundlegende Funktionalit?t.</description>
    <description xml:lang="de_CH">Grundlegende Funktionalit?t.</description>
    <description xml:lang="es">Funcionalidad básica.</description>
    <description xml:lang="es_ES">Funcionalidad básica.</description>
    <description xml:lang="fr">Fonctionnalité de base.</description>
    <description xml:lang="gu">?????? ?????.</description>
    <description xml:lang="hi">????? ???????????????.</description>
    <description xml:lang="it">Funzione di base.</description>
    <description xml:lang="it_IT">Funzione di base.</description>
    <description xml:lang="ja">基本的な機能です。</description>
    <description xml:lang="ja_JP">基本的な機能です。</description>
    <description xml:lang="kn">?????? ???????????.</description>
    <description xml:lang="ko">???? ?????.</description>
    <description xml:lang="ml">???????? ????????????????.</description>
    <description xml:lang="mr">??? ???????????.</description>
    <description xml:lang="or">?????? ??????????????</description>
    <description xml:lang="pa">?????? ??????????</description>
    <description xml:lang="pl">Podstawowa funkcjonalno??.</description>
    <description xml:lang="pt">Fun??o básica</description>
    <description xml:lang="pt_BR">Fun??o básica</description>
    <description xml:lang="ru">Базовая функциональность.</description>
    <description xml:lang="ru_RU">Базовая функциональность.</description>
    <description xml:lang="ta">???????? ?????????.</description>
    <description xml:lang="ta_IN">???????? ?????????.</description>
    <description xml:lang="te">???????? ???????????.</description>
    <description xml:lang="uk">Основн? можливост?.</description>
    <description xml:lang="uk_UA">Основн? можливост?.</description>
    <description xml:lang="zh">基本功能。</description>
    <description xml:lang="zh_CN">基本功能。</description>
    <description xml:lang="zh_TW">基本功能。</description>
    <display_order>5</display_order>
    <grouplist>
      <groupid>core</groupid>
      <groupid>core</groupid>
    </grouplist>
    <optionlist>
      <groupid>debugging</groupid>
      <groupid>debugging</groupid>
    </optionlist>
  </environment>
  <environment>
</comps>

[root@localhost ~]#

第六：把准备好的 rpm包拷贝到/home/centos7/Packages/

提取rpm包不下载用以下命令

yum install --downloadonly    wget
find  /var/cache/  -name  "*.rpm"  -exec  \cp -av  {}  /root/kernel-5.5/  \;

\cp -rav /root/kernel-5.5/*  /home/centos7/Packages/



[root@localhost ~]# ls /root/kernel-5.5/*
/root/kernel-5.5/kernel-ml-5.5.7-1.el7.elrepo.x86_64.rpm
/root/kernel-5.5/kernel-ml-devel-5.5.7-1.el7.elrepo.x86_64.rpm
/root/kernel-5.5/kernel-ml-doc-5.5.7-1.el7.elrepo.noarch.rpm
/root/kernel-5.5/kernel-ml-headers-5.5.7-1.el7.elrepo.x86_64.rpm
/root/kernel-5.5/kernel-ml-tools-5.5.7-1.el7.elrepo.x86_64.rpm
/root/kernel-5.5/kernel-ml-tools-libs-5.5.7-1.el7.elrepo.x86_64.rpm
/root/kernel-5.5/kernel-ml-tools-libs-devel-5.5.7-1.el7.elrepo.x86_64.rpm
/root/kernel-5.5/perf-5.5.7-1.el7.elrepo.x86_64.rpm
/root/kernel-5.5/perl-5.16.3-294.el7_6.x86_64.rpm
/root/kernel-5.5/perl-Carp-1.26-244.el7.noarch.rpm
/root/kernel-5.5/perl-constant-1.27-2.el7.noarch.rpm
/root/kernel-5.5/perl-Data-Dumper-2.145-3.el7.x86_64.rpm
/root/kernel-5.5/perl-Encode-2.51-7.el7.x86_64.rpm
/root/kernel-5.5/perl-Exporter-5.68-3.el7.noarch.rpm
/root/kernel-5.5/perl-File-Path-2.09-2.el7.noarch.rpm
/root/kernel-5.5/perl-File-Temp-0.23.01-3.el7.noarch.rpm
/root/kernel-5.5/perl-Filter-1.49-3.el7.x86_64.rpm
/root/kernel-5.5/perl-Getopt-Long-2.40-3.el7.noarch.rpm
/root/kernel-5.5/perl-HTTP-Tiny-0.033-3.el7.noarch.rpm
/root/kernel-5.5/perl-libs-5.16.3-294.el7_6.x86_64.rpm
/root/kernel-5.5/perl-macros-5.16.3-294.el7_6.x86_64.rpm
/root/kernel-5.5/perl-parent-0.225-244.el7.noarch.rpm
/root/kernel-5.5/perl-PathTools-3.40-5.el7.x86_64.rpm
/root/kernel-5.5/perl-Pod-Escapes-1.04-294.el7_6.noarch.rpm
/root/kernel-5.5/perl-podlators-2.5.1-3.el7.noarch.rpm
/root/kernel-5.5/perl-Pod-Perldoc-3.20-4.el7.noarch.rpm
/root/kernel-5.5/perl-Pod-Simple-3.28-4.el7.noarch.rpm
/root/kernel-5.5/perl-Pod-Usage-1.63-3.el7.noarch.rpm
/root/kernel-5.5/perl-Scalar-List-Utils-1.27-248.el7.x86_64.rpm
/root/kernel-5.5/perl-Socket-2.010-4.el7.x86_64.rpm
/root/kernel-5.5/perl-Storable-2.45-3.el7.x86_64.rpm
/root/kernel-5.5/perl-Text-ParseWords-3.29-4.el7.noarch.rpm
/root/kernel-5.5/perl-threads-1.87-4.el7.x86_64.rpm
/root/kernel-5.5/perl-threads-shared-1.43-6.el7.x86_64.rpm
/root/kernel-5.5/perl-Time-HiRes-1.9725-3.el7.x86_64.rpm
/root/kernel-5.5/perl-Time-Local-1.2300-2.el7.noarch.rpm
/root/kernel-5.5/python-perf-5.5.7-1.el7.elrepo.x86_64.rpm
[root@localhost ~]#

第六：生成iso镜像,在当前目录下

cd /home/centos7/
createrepo  -g  comps.xml   ./
genisoimage -joliet-long -V CentOS7 -o CentOS-7.7-kernel-5.5.iso -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -R -J -v -cache-inodes -T -eltorito-alt-boot -e images/efiboot.img -no-emul-boot /home/centos7

效果