Fedora DNS配置持久化

操作系统

通过Virtual Box安装Fedora 37，操作系统信息如下所示：

[root@localhost ~]# cat /etc/os-release
NAME="Fedora Linux"
VERSION="37 (Server Edition)"
ID=fedora
VERSION_ID=37
VERSION_CODENAME=""
PLATFORM_ID="platform:f37"
PRETTY_NAME="Fedora Linux 37 (Server Edition)"
ANSI_COLOR="0;38;2;60;110;180"
LOGO=fedora-logo-icon
CPE_NAME="cpe:/o:fedoraproject:fedora:37"
HOME_URL="https://fedoraproject.org/"
DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora/f37/system-administrators-guide/"
SUPPORT_URL="https://ask.fedoraproject.org/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_BUGZILLA_PRODUCT="Fedora"
REDHAT_BUGZILLA_PRODUCT_VERSION=37
REDHAT_SUPPORT_PRODUCT="Fedora"
REDHAT_SUPPORT_PRODUCT_VERSION=37
VARIANT="Server Edition"
VARIANT_ID=server

网卡设置：

• enp0s3：网络地址转换（NAT）；
• enp0s8：仅主机（host-only）网络；

DNS自动配置

安装后，DNS配置信息如下所示：

[root@localhost system-connections]# resolvectl status
Global
       Protocols: LLMNR=resolve -mDNS -DNSOverTLS DNSSEC=no/unsupported
resolv.conf mode: stub

Link 2 (enp0s3)
    Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
         Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
Current DNS Server: 192.168.11.28
       DNS Servers: 192.168.11.28 192.168.78.39 192.168.78.40

Link 3 (enp0s8)
Current Scopes: LLMNR/IPv4 LLMNR/IPv6
     Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported

可以看到enp0s3网卡使用192.168.11.28局域网地址作为DNS server，解析部分域名存在问题，因此尝试更换为阿里云DNS。

更换DNS Server

sudo resolvectl dns enp0s3  223.5.5.5 223.6.6.6

查看更换后DNS信息

resolvectl status
Global
       Protocols: LLMNR=resolve -mDNS -DNSOverTLS DNSSEC=no/unsupported
resolv.conf mode: stub

Link 2 (enp0s3)
Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
     Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
   DNS Servers: 223.5.5.5 223.6.6.6

Link 3 (enp0s8)
Current Scopes: LLMNR/IPv4 LLMNR/IPv6
     Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported

查看可知，DNS配置已变更。

Tips

修改/etc/resolv.conf。实际上不生效，且每次重启机器后，DNS Server信息会丢失。