云计算 SRE 运维 —— 第三周

yum私有仓库

下载工具包

[root@test01 ~]# yum install -y createrepo yum-utils

制作私有yum源

# 安装httpd
[root@test01 ~]# yum install -y httpd

# 列出当前yum源列表
[root@test01 ~]# yum repolist 
repo id                                            repo name
AppStream                                          AppStream
BaseOS                                             BaseOS
epel                                               epel
extras                                             extras

# 下载镜像源到本地
[root@test01 ~]# yum reposync --repoid=extras --download-metadata -p /var/www/html/mirros/
[root@test01 ~]# yum reposync --repoid=BaseOS --download-metadata -p /var/www/html/mirros/
[root@test01 ~]# yum reposync --repoid=epel --download-metadata -p /var/www/html/mirros/

# 移除其他yum源文件
[root@test01 ~]# mkdir /opt/repo; mv /etc/yum.repos.d/* /opt/repo/

# 创建yum源文件
[root@test01 ~]# cat > /etc/yum.repos.d/test.repo << EOF
> [test]
> name=test
> baseurl=http://10.0.0.11/mirros/extras
> gpgcheck=0
> enable=1
> EOF

# 启动httpd服务
[root@test01 ~]# systemctl enable --now httpd

# 列出当前yum源列表
[root@test01 ~]# yum repolist
repo id                                             repo name
test                                                test

图解TCP

三次握手

TCP建立连接（3次握手）

1. 客户端向服务器发送同步请求报文

2. 服务器收到报文，发送同步确认报文

3. 客户端收到报文，发送确认报文

四次挥手

TCP释放连接（4次挥手）

1. 客户端发送释放连接请求报文

2. 服务器收到报文，发送确认报文

3. 服务器发送释放连接请求报文

4. 客户端接收报文，发送确认报文

配置静态IP

CentOS & Rocky

# 修改网卡配置文件
[root@test01 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 
BOOTPROTO=static		# 静态IP
NAME=eth0
DEVICE=eth0
ONBOOT=yes				# 开机自启
IPADDR=10.0.0.11		# 静态IP
PREFIX=24				# 子网掩码长度
GATEWAY=10.0.0.2		# 网关
DNS1=10.0.0.2			# DNS
DNS2=180.76.76.76

# 生效
[root@test01 ~]# nmcli connection reload 
[root@test01 ~]# nmcli connection up eth0

Ubuntu

[root@ubuntu ~]# cd /etc/netplan/
[root@ubuntu netplan]# cat eth0.yaml 
# This is the network config written by 'subiquity'
network:
  version: 2
  renderer: networkd
  ethernets: 					# 网卡名称
    eth0:
      addresses:  
      - 10.0.0.20/24			# 静态IP
      gateway4: 10.0.0.2		# 网关
      nameservers: 
        addresses: 
        - 10.0.0.2				# DNS
        
# 使配置生效
[root@ubuntu netplan]# netplan apply 

expect登陆远程主机

#!/bin/bash
# **********************************************************
#
# * Author        : 彤彤爱吃薯条
# * Create time   : 2022-10-18 12:33
# * Filename      : test.sh
# * Description   : 
#
# **********************************************************

MYIP=`ip address show eth0 | sed -n 3p | awk -F '[ /]+' '{print $3}'`
PASS=000000


. /etc/os-release


function color  {
    RES_COL=60
    MOVE_TO_COL="echo -en \\033[${RES_COL}G"
    SETCOLOR_SUCCESS="echo -en \\033[1;32m"
    SETCOLOR_FAILURE="echo -en \\033[1;31m"
    SETCOLOR_WARNING="echo -en \\033[1;33m"
    SETCOLOR_NORMAL="echo -en \E[0m"
    echo -n "$1" && $MOVE_TO_COL
    echo -n "["
    if [ $2 = "success" -o $2 = "0" ] ;then
        ${SETCOLOR_SUCCESS}
        echo -n $"    OK    "
    elif [ $2 = "failure" -o $2 = "1"  ] ;then
        ${SETCOLOR_FAILURE}
        echo -n $"  FAILED  "
    else
        ${SETCOLOR_WARNING}
        echo -n $"  WARNING  "
    fi
    ${SETCOLOR_NORMAL}
    echo -n "]"
    echo
}


function ssh_login {
    if [ $ID = "centos" -o $ID = "rocky" ]; then
        yum install -y sshpass
    else
        apt update
        apt install -y sshpass
    fi

    if [ $? -eq 0 ]; then
        color "sshpass安装成功" 0
    else
        color "sshpass安装失败,请检查网络配置" 1
        exit
    fi


    rm -rf /root/.ssh/* &> /dev/null
    ssh-keygen -P "" -f /root/.ssh/id_rsa -t rsa
    sshpass -p $PASS ssh-copy-id -o StrictHostKeyChecking=no root@$MYIP

    while (true); do
        read -p "请输入接收秘钥的主机IP（输入exit退出）: " IP1
        if [ $IP1 = "exit" ]; then
            break
        else
            sshpass -p $PASS scp -o StrictHostKeyChecking=no -r /root/.ssh/* root@$IP1:/root/.ssh/
        fi
    done

    echo -e "\n"

    read -p "请输入需要远程登录的IP（输入exit退出）: " IP2
        if [ $IP2 = "exit" ]; then
            exit
        else
            ssh root@$IP2
        fi
}


function install_httpd {
    if [ $ID = "centos" -o $ID = "rocky" ]; then
        rpm -q httpd || yum install -y httpd
    else
        apt update
        dpkg -s httpd || apt install -y httpd
    fi

    if [ $? -eq 0 ]; then
        color "HTTPD安装成功" 0
    else
        color "HTTPD安装失败,请检查网络配置" 1
        exit
    fi
}

function install_mysql {
    if [ $ID = "centos" -o $ID = "rocky" ]; then
        yum install -y mysql-server mysql
    else
        apt update
        apt install -y mysql-server mysql
    fi

    if [ $? -eq 0 ]; then
        color "MySQL安装成功" 0
    else
        color "MySQL安装失败,请检查网络配置" 1
        exit
    fi
}


PS3="请选择要执行的操作: "

select MENU in 免秘钥登录主机 安装HTTPD 安装MySQL 退出; do
    case $REPLY in
        1)
            ssh_login
            ;;
        2)
            install_httpd
            ;;
        3)
            install_mysql
            ;;
        4)
            echo "程序退出！"
            break
            ;;
        *)
            echo "别乱来！"
            ;;
    esac
done