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systemd-resolved: Default to Cache=no-negative 

LP: #1895418
Thanks: Dimitri John Ledkov for the suggestion and
Co-authored-by: Dan Streetman <ddstreet@canonical.com>

Gbp-Pq: Topic debian
Gbp-Pq: Name UBUNTU-resolved-default-no-negative-caching.patch
This commit is contained in:
Balint Reczey 2019-12-11 22:01:13 +01:00 committed by liaoxianfu
parent c2d73f4061
commit 8c22a9772c
4 changed files with 5 additions and 5 deletions
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4
man/resolved.conf.xml
View File

@ -249,10 +249,10 @@
<varlistentry>
<term><varname>Cache=</varname></term>
<listitem><para>Takes a boolean or <literal>no-negative</literal> as argument. If
<literal>yes</literal> (the default), resolving a domain name which already got queried earlier will
<literal>yes</literal>, resolving a domain name which already got queried earlier will
return the previous result as long as it is still valid, and thus does not result in a new network
request. Be aware that turning off caching comes at a performance penalty, which is particularly high
when DNSSEC is used. If <literal>no-negative</literal>, only positive answers are cached.</para>
when DNSSEC is used. If <literal>no-negative</literal> (the default), only positive answers are cached.</para>
<para>Note that caching is turned off by default for host-local DNS servers.
See <varname>CacheFromLocalhost=</varname> for details.</para></listitem>

2
src/resolve/resolved-gperf.gperf
View File

@ -26,7 +26,7 @@ Resolve.LLMNR, config_parse_resolve_support, 0,
Resolve.MulticastDNS, config_parse_resolve_support, 0, offsetof(Manager, mdns_support)
Resolve.DNSSEC, config_parse_dnssec_mode, 0, offsetof(Manager, dnssec_mode)
Resolve.DNSOverTLS, config_parse_dns_over_tls_mode, 0, offsetof(Manager, dns_over_tls_mode)
Resolve.Cache, config_parse_dns_cache_mode, DNS_CACHE_MODE_YES, offsetof(Manager, enable_cache)
Resolve.Cache, config_parse_dns_cache_mode, DNS_CACHE_MODE_NO_NEGATIVE, offsetof(Manager, enable_cache)
Resolve.DNSStubListener, config_parse_dns_stub_listener_mode, 0, offsetof(Manager, dns_stub_listener_mode)
Resolve.ReadEtcHosts, config_parse_bool, 0, offsetof(Manager, read_etc_hosts)
Resolve.ResolveUnicastSingleLabel, config_parse_bool, 0, offsetof(Manager, resolve_unicast_single_label)

2
src/resolve/resolved-manager.c
View File

@ -578,7 +578,7 @@ int manager_new(Manager **ret) {
.mdns_support = DEFAULT_MDNS_MODE,
.dnssec_mode = DEFAULT_DNSSEC_MODE,
.dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE,
.enable_cache = DNS_CACHE_MODE_YES,
.enable_cache = DNS_CACHE_MODE_NO_NEGATIVE,
.dns_stub_listener_mode = DNS_STUB_LISTENER_YES,
.read_resolv_conf = true,
.need_builtin_fallbacks = true,

2
src/resolve/resolved.conf.in
View File

@ -26,7 +26,7 @@
#DNSOverTLS={{DEFAULT_DNS_OVER_TLS_MODE_STR}}
#MulticastDNS={{DEFAULT_MDNS_MODE_STR}}
#LLMNR={{DEFAULT_LLMNR_MODE_STR}}
#Cache=yes
#Cache=no-negative
#CacheFromLocalhost=no
#DNSStubListener=yes
#DNSStubListenerExtra=