From d04cf6b2ae12596a481c37b8d25f652f099ae5cd Mon Sep 17 00:00:00 2001
From: Steve Kuznetsov <skuznets@redhat.com>
Date: Tue, 13 Jun 2017 09:57:00 -0700
Subject: Disable negative caching, set cache TTL to 1s
When running headless services as pods on OpenShift, no ClusterIP is
assigned. In these cases, peer pods are relying on DNS to locate the
service endpoints. When a pod is deleted or another trigger causes the
endpoint to change, the OpenShift DNS is updated immediately. However,
dnsmasq has a default TTL of 30s, so the wrong response is returned
on name resolution. Removing negative caching and turning the TTL to
a very short 1s should resolve the issue.
Signed-off-by: Steve Kuznetsov <skuznets@redhat.com>
---
roles/openshift_node_dnsmasq/templates/origin-dns.conf.j2 | 2 ++
1 file changed, 2 insertions(+)
(limited to 'roles/openshift_node_dnsmasq')
diff --git a/roles/openshift_node_dnsmasq/templates/origin-dns.conf.j2 b/roles/openshift_node_dnsmasq/templates/origin-dns.conf.j2
index f397cbbf1..8bae9aaac 100644
--- a/roles/openshift_node_dnsmasq/templates/origin-dns.conf.j2
+++ b/roles/openshift_node_dnsmasq/templates/origin-dns.conf.j2
@@ -1,3 +1,5 @@
no-resolv
domain-needed
server=/{{ openshift.common.dns_domain }}/{{ openshift.common.kube_svc_ip }}
+no-negcache
+max-cache-ttl=1
--
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