debain 、pve虚拟化平台修改国内源并修改dns_pve dns设置

pve 是基于debain的一个linux 虚拟化平台，可以实现创建虚拟机。

问题：
Failed to fetch xxxxxxx

E: Failed to fetch http://ftp.debian.org/debian/pool/main/p/postfix/postfix_3.5.13-0%2bdeb11u1_amd64.deb  Temporary failure resolving 'ftp.debian.org'
E: Failed to fetch http://ftp.debian.org/debian/pool/main/p/procmail/procmail_3.22-26%2bdeb11u1_amd64.deb  Temporary failure resolving 'ftp.debian.org'
E: Failed to fetch http://ftp.debian.org/debian/pool/main/t/tcpdump/tcpdump_4.99.0-2%2bdeb11u1_amd64.deb  Temporary failure resolving 'ftp.debian.org'
E: Failed to fetch http://security.debian.org/pool/updates/main/libx/libxslt/xsltproc_1.1.34-4%2bdeb11u1_amd64.deb  Temporary failure resolving 'ftp.debian.org'
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
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1、 先修改国内源

vi /etc/apt/sources.list
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需要自己更具当前的PVE版本切换源的版本
如下 buster为版本

deb http://security.debian.org buster/updates main contrib
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则需要将 bullseye改为buster

deb http://mirrors.aliyun.com/debian-security/ bullseye-security main
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加入下边更新源，自行更改版本号

# security updates
#deb http://security.debian.org buster/updates main contrib
# 默认源可以注释掉

# debian aliyun source
deb https://mirrors.aliyun.com/debian buster main contrib non-free
deb https://mirrors.aliyun.com/debian buster-updates main contrib non-free
deb https://mirrors.aliyun.com/debian-security buster/updates main contrib non-free
 
# proxmox source
# deb http://download.proxmox.com/debian/pve buster pve-no-subscription
deb https://mirrors.ustc.edu.cn/proxmox/debian/pve buster pve-no-subscription

deb http://mirrors.aliyun.com/debian/ bullseye main non-free contrib

deb-src http://mirrors.aliyun.com/debian/ bullseye main non-free contrib

deb http://mirrors.aliyun.com/debian-security/ bullseye-security main

deb-src http://mirrors.aliyun.com/debian-security/ bullseye-security main

deb http://mirrors.aliyun.com/debian/ bullseye-updates main non-free contrib

deb-src http://mirrors.aliyun.com/debian/ bullseye-updates main non-free contrib

deb http://mirrors.aliyun.com/debian/ bullseye-backports main non-free contrib

deb-src http://mirrors.aliyun.com/debian/ bullseye-backports main non-free contrib
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如果你没有订阅 Proxmox VE 企业版，可以将企业版软件源配置信息在软件源配置文件中注释掉(在该行开头插入一个 # 字符)，以避免系统发出错误提示信息。这种情况下可以配置使用 pve-no-subscriptin 软件源。因为没有订阅 Proxmox VE 企业版服务，所以这里对Proxmox VE 企业版更新源进行注释操作。

vi /etc/apt/sources.list.d/pve-enterprise.list
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注释掉下边代码

#deb https://enterprise.proxmox.com/debian/pve buster pve-enterprise
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2、 配置DNS 服务器

vi /etc/resolv.conf
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写入下边dns服务器

#设置首选dns
nameserver 114.114.114.114  
#设置备用dns
nameserver 8.8.8.8   
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重启网络配置让其生效。

sudo service networking restart
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3、 执行更新或者安装软件依赖

执行更新源

apt update
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若是仍然报错，不能更新或安装；先删除 /var/lib/apt/lists/partial 目录下的所有文件，然后运行apt-get update。

cd /var/lib/apt/lists/partial
rm ./* 
apt-get update
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如需升级pve，则执行该命令

apt update && apt dist-upgrade -y
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更新已安装的包

apt upgrade
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安装软件或依赖

apt-get install vim -y 
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