问题

ubuntu18.04LTS搭建k8s coredns组件报错
因为/etc/resolve.conf中存在 nameserver 127.0.0.53回环地址造成循环引用
手动修改无果，每次重启依旧会覆盖

原因

ubuntu17.0之后特有，systemd-resolvd服务会一直覆盖

解决办法

sudo systemctl stop systemd-resolved
sudo systemctl disable systemd-resolved
sudo apt install unbound
sudo rm -rf /etc/resolv.conf
sudo vim  /etc/NetworkManager/NetworkManager.conf

在[main]
下面添加
dns=unbound
将dns服务替换为unbound
reboot
重启电脑即可，开机查看resolve.conf发现nameserver自动配置