红帽全球峰会5.5. Kernel parameters for DNS configuration
You can use kernel arguments to enable DNS over TLS (DoT) at boot time and set DNS resolution behavior for your system.
rd.net.dns-resolve-modeDefines how DNS servers from global configuration are used during resolution. The following modes are relevant for both kernel arguments and
NetworkManager.confglobal configuration:exclusive-
Uses only the DNS servers specified by kernel arguments or in
NetworkManager.conf. Forbids fallback to DNS servers retrieved from connections. This mode is currently relevant only fordnsconfdplugin. prefer- Forbids using DNS servers from connections for general queries unless the queries are subdomains of domains set by connection.
backup- Merges and uses DNS servers from both the global configuration and network connections for the same purposes.
rd.net.dns-serversConfigures the list of DNS servers to use. To define multiple DNS servers, set
rd.net.dnsmultiple times:rd.net.dns=dns+tls://<server_ip_1>#<dns_server_hostname_1> rd.net.dns=dns+tls://<server_ip_2>#<dns_server_hostname_2>For example:
rd.net.dns=dns+tls://198.51.100.143#dot.dns.example.com rd.net.dns=dns+tls://203.0.113.1#dot.dns.example.netrd.net.dns-backend-
Specifies the back-end DNS resolver. When set to
dnsconfd, the system usesdnsconfdas a local DNS cache configuration daemon.
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