镜像完成后可用于PXE环境或U盘randisk等
安装系统
考虑到实际应用中Ramdisk需要保持小而精，故在安装系统时选择最小化安装，然后再安装所需要的包。
安装必要软体
tool | 描述 |
|---|---|
vim | |
ifconfig | net-tools |
lspci | pciutils |
numactl | |
nfs | |
tmux | |
ftp | |
bc | |
smartctl | smartmontools |
mailx | |
mktemp | |
mcelog | |
ipmi | ipmitool和OpenIPMI |
编译环境 | gcc make kernel-headers gcc-c kernel-devel |
dos2unix | |
ethtool | |
lsusb | usbutils |
zlib | |
zip | |
unzip | |
killall | psmisc |
sg3_utils | |
numactl | |
locate | mlocate |
rngd.service | rng-tools |
strace | strace |
expect | expect和tcl |
openssh | |
openssh-server | |
nvme | |
mcelog | |
smartd | |
issdcm |
一些OS设置
代码语言：javascript复制systemctl set-default multi-user.target
timedatectl set-timezone Asia/Shanghai #Modify TIME zone
systemctl disable firewalld
systemctl disable NetworkManager
sed -i "/^SELINUX=/cSELINUX=disabled" /etc/selinux/config #disable SELINUX
setenforce 0 #shutdown SELINUX
sed -i "s/^ExecStart=-/sbin/agetty --noclear %I $TERM/& --autologin root/g" /usr/lib/systemd/system/getty@.service #root autologin
sed -i "s/^ExecStart=-/sbin/agetty --keep-baud 115200,38400,9600 %I $TERM/& --autologin root/g" /usr/lib/systemd/system/serial-getty@.service #root Serial autologin
sed -i "/^#UseDNS/cUseDNS no" /etc/ssh/sshd_config #SSH setting
sed -i "/^#IgnoreUserKnownHosts no/cIgnoreUserKnownHosts yes" /etc/ssh/sshd_config #SSH setting
sed -i "/StrictHostKeyChecking/cStrictHostKeyChecking no" /etc/ssh/ssh_config #SSH client setting
echo -e "set -g mode-keys vinset -g prefix C-anunbind C-bnbind C-a send-prefix" > /root/.tmux.conf #tmux setting
打包系统
代码语言：javascript复制[root@localhost ~]# cat make_img.sh
#!/bin/bash
###############################################
# Filename : make_img.sh
# Author : PedroQin
# Date : 2020-01-17 15:54:12
# Description :
# Version : 1.0.0
###############################################
target_folder="/temp/create_os"
os_folder="$target_folder/os"
# show message in green
function green_message()
{
tput bold
echo -ne " 33[32m$@ 33[0m"
echo
}
# show message in red
function red_message()
{
tput bold
echo -ne " 33[31m$@ 33[0m"
echo
}
# print description and then run it
function print_run()
{
if [ $# -eq 1 ];then
green_message "$1"
eval "$1"
elif [ $# -ge 2 ];then
green_message "$1"
shift
eval "$@"
else
return -1
fi
}
whereami=`cd $(dirname $0);pwd`
change_log="$whereami/Changelog"
version=`awk '/Version/ {print $2}' $change_log | sed -n '1p'`
[ -z "$version" ] && red_message "please check $change_log" && exit 1
DATE=`date "%Y%m%d%H%M%S"`
os_image="initrd_${version}_${DATE}.img"
green_message "Image Name : $os_image , press any key to package ..."
read -n 1
green_message "Copy Data..."
print_run "mkdir -p $os_folder"
print_run "cp -d /{bin,lib,lib64,sbin} $os_folder"
print_run "cp -arf /{boot,etc,opt,root,run,srv,usr,var} $os_folder"
print_run "mkdir $os_folder/{dev,home,media,mnt,proc,sys,log,tmp}"
green_message "Initialize Data..."
print_run "delete fstab" "rm -f $os_folder/etc/fstab 2>/dev/null"
print_run "delete network config file" "rm -rf $os_folder/etc/sysconfig/network-scripts/ifcfg-e* 2>/dev/null"
print_run "delete log" "rm $os_folder/var/log/messages* ; rm $os_folder/var/log/dmesg* ; rm $os_folder/var/log/mail* ; rm $os_folder/var/log/mcelog* ;rm $os_folder/var/log/boot.log* ;rm $os_folder/var/log/cron* ;rm $os_folder/var/log/secure* ;rm $os_folder/var/log/spooler* ;rm $os_folder/var/log/yum.log* ;rm $os_folder/var/log/btmp* ;touch $os_folder/var/log/mcelog "
print_run "clean log" "echo > $os_folder/root/.ssh/known_hosts ; echo > $os_folder/root/.bash_history ; echo > $os_folder/var/log/wtmp ; echo > $os_folder/var/log/btmp ; echo > $os_folder/root/.viminfo"
print_run "create init" "cp $os_folder/usr/sbin/init $os_folder"
green_message "Package image..."
print_run "cd $os_folder; find .|cpio -c -o|xz --format=lzma --best > ../$os_image"
echo
green_message "OS image: $target_folder/$os_image"
