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Ubuntu 使用apt-get安装报错Could not resolve

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Kubehan
作者
Kubehan
云原生知识栈：深度解析容器技术、Kubernetes、Istio、DevOps 实践、Prometheus 监控、Envoy 代理、Golang 开发及云原生架构与微服务趋势的专业博客

报错信息如下

root@k8s-1:/etc/apt/apt.conf.d# apt-get update
Err:1 http://mirrors.aliyun.com/ubuntu bionic InRelease
  Could not resolve 'mirrors.tuna.tsinghua.cn'
Err:2 http://mirrors.aliyun.com/ubuntu bionic-security InRelease
  Could not resolve 'mirrors.tuna.tsinghua.cn'
Err:3 http://mirrors.aliyun.com/ubuntu bionic-updates InRelease
  Could not resolve 'mirrors.tuna.tsinghua.cn'
Err:4 http://mirrors.aliyun.com/ubuntu bionic-proposed InRelease
  Could not resolve 'mirrors.tuna.tsinghua.cn'
Err:5 http://mirrors.aliyun.com/ubuntu bionic-backports InRelease
  Could not resolve 'mirrors.tuna.tsinghua.cn'
Reading package lists... Done
W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/bionic/InRelease  Could not resolve 'mirrors.tuna.tsinghua.cn'
W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/bionic-security/InRelease  Could not resolve 'mirrors.tuna.tsinghua.cn'
W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/bionic-updates/InRelease  Could not resolve 'mirrors.tuna.tsinghua.cn'
W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/bionic-proposed/InRelease  Could not resolve 'mirrors.tuna.tsinghua.cn'
W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/bionic-backports/InRelease  Could not resolve 'mirrors.tuna.tsinghua.cn'
W: Some index files failed to download. They have been ignored, or old ones used instead.

这里总结比较常见的几种方法
1.报错大意为不能解析到某个地址
可能的情况有地址不可用，也就是你源配置有误，百度镜像源找阿里，清华，网易等源来配置
2.源正确仍然无法解析？
dns配置有误
配置dns

vim /etc/systemd/resolved.conf

[Resolve]
DNS=8.8.8.8
#FallbackDNS=
#Domains=
#LLMNR=no
#MulticastDNS=no
#DNSSEC=no
#Cache=yes
#DNSStubListener=yes

检查自己的dns配置
3.前面2个都没问题。还不能apt
检查是否设置了apt代理，我就是设置了代理，而代理不能用，导致无法使用，那么你需要把代理地址改成有效地址，我是直接取消代理，
代理地址配置文件：

root@k8s-1:/etc/apt/apt.conf.d# pwd
/etc/apt/apt.conf.d
root@k8s-1:/etc/apt/apt.conf.d# vim 90curtin-aptproxy

Acquire::http::Proxy "https://mtsinghua.cn/ubuntu";
Acquire::https::Proxy "https://a.tsinghua.cn/ubuntu";

改成有效地址或直接删除、再apt-get update

file