week03

yum私有仓库的实现

服务器环境：
VERSION=“9.1 (Blue Onyx)”
ID=“rocky”
1.安装httpd服务
2.下载软件源
3.http协议访问测试路径
4.配置yum源

安装httpd服务

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yum -y install httpd
systemctl enable --now httpd

复制Base源

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mkdir /var/www/html/centos/8 -pv
mount /dev/sr0 /mnt/
cp -a /mnt/* /var/www/html/centos/8

下载epel源

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dnf repolist#查看仓库ID
dnf reposync --repoid=epel --download-metadata -p /var/www/html/centos
dnf -y install createrepo httpd
createrepo /var/www/html/centos/epel/

浏览器验证访问路径，找到repodata路径

epel源

Base源

修改yum源

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cd /etc/yum.repos.d/
cp base.repo base.repo.bak #备份

yum源

TCP协议和三次握手及四次挥手

三次握手四次挥手

静态配置网卡IP

centos

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#修改网卡名称
function replacenetworkname(){
source /etc/os-release
if [ $ID = 'ubuntu'   ] ; then
    sed  -ri.bak 's|^GRUB_CMDLINE_LINUX=.*|GRUB_CMDLINE_LINUX=/" net.ifnames=0\"|g' /etc/default/grub
    grub-mkconfig -o /boot/grub/grub.cfg    

else 
    sed  -ri.bak 's|^(GRUB_CMDLINE_LINUX.*)(")$|\1 net.ifnames=0\2|g' /etc/default/grub
    grub2-mkconfig -o /boot/grub2/grub.cfg

fi

}
#修改网卡后重启服务器生效
#查看当前机器网卡 
ip a
cd /etc/sysconfig/network-scripts/
vi ifcfg-eth0

DEVICE=eth0
NAME=eth0
BOOTRPOTO=static
IPADDR=10.0.0.11
PREFIX=24
GATEWAY=10.0.0.2
DNS1=8.8.8.8

nmcli c reload #配置生效
nmcli c up eth0 #网卡生效
#重新查看配置 ip a  / ip  route

ubuntu

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vi /etc/netplan/eth0.yam
network:
     ethernets:
        eth0:
            dhcp4: no
            addresses: [10.0.0.12/24]
            gateway4: 10.0.0.11
            nameservers:
              addresses: [8.8.8.8]
     version: 2
netplan apply # 配置生效
ip route /ip a #查看配置

实现免密登陆脚本, expect登陆远程主机，将生成的密钥写入到目标主机, expect测试远程登陆。

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#!/bin/bash 
# 
#************************************ 
#Author:                 白展躺 
#Date:                   2023-06-12 
#FileName:               install.sh 
#Description:            功能主菜单 
#Copyright:              2023 
#************************************ 
 
function passwordlessLogin(){ 
echo "请输入登录的IP:"
read -ea     values
local 
for value  in  "${values[@]}" ;
do
    /usr/bin/expect ./passwordlessLogin.sh $value
    shift
done
}

MENU=(
 "安装mysql" 
 "安装apahce"
 "免密钥登录主机"
 "退出"

)
RED=" \E[01;31m"
END="\E[0m"
GREEN="\E[1;32m"

while true; do
PS3="请选择一个选项: "
select opt in  "${MENU[@]}"
do
  case $opt in
    "安装mysql")
      #installmysql
      echo -e "$RED建设中...$END"
      break
      ;;  
    "安装apahce")
      echo -e "$RED建设中...$END"
    
      break
      ;;  
    "免密钥登录主机")
      passwordlessLogin
     break
      ;;  
    "退出")
      echo -e  "$GREEN祝您工作愉快 再见!$END"
      break 2
      ;;  
    *)  
      echo "无效的选项，请重新选择"
      ;;  
  esac
done
done

passwordlessLogin.sh脚本

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#!/bin/expect
#
#************************************
#Author:                 白展躺
#Date:                   2023-06-12
#FileName:               passwordlessLogin.sh
#Description:            免密登录
#Copyright:              2023
#************************************
set timeout -1
set IP [lindex $argv 0]
spawn ssh-copy-id root@$IP -f
expect {
    "yes/no" {send "yes\n"; exp_continue  }
    "password" {
       send "1\r";
    
       expect eof; 
    
    }   
   
}
spawn ssh $IP 
expect {
    -re "Last login.*" {
       puts "$IP:测试登录成功"
       send   "exit\r"
    }   

}