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On cluster without internal name resolution there will be no `search XXX` on /etc/resolv.conf at all, thus this script will fail to add an entry for `cluster.local`.
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This will happen whenever someone has directly modified /etc/resolv.conf
Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1480438
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Don't attempt to copy /etc/resolv.conf whenever there's no watermark,
just write out the list of nameservers that network manager tells us
about like we do for origin-upstream-dns.conf
Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1474707
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Configures OPENSHIFT_DEFAULT_REGISTRY=docker-registry.default.svc
Adds 'cluster.local' to dns search on nodes via dispatcher script
Adds '.svc' to NO_PROXY defaults
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Fixes Bug 1401425
Fixes BZ1401425
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strict-order forces dnsmasq to iterate through nameservers in order. If one of
the nameservers is down this will slow things down while dnsmasq waits for a
timeout. Also, this option prevents dnsmasq from querying other nameservers if
the first one returns a negative result. While I think it's odd to have a
nameserver that returns negative results for a query that another returns
positive results for this does seem to fix the issue in testing.
Fixes Bug 1399577
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A dhcp6-change event may happen on nodes running dual stack
IPv4/IPv6 and DHCP, even if Openshift itself doesn't use IPv6.
/etc/resolv.conf needs be adjusted as well in this case.
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- Prevent the script to echo blank values from IP4_NAMESERVERS variable
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According to the man page for resolv.conf # needs to be in the first collumn in
order to start a comment. While this didn't seem to affect glibc's resolver it
did really confuse the kubelet which parses the host's resolv.conf
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99-origin-dns.sh from adding a new line in /etc/resolv.conf everytime the NetworkManager dispatcher script is executed.
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Only modify resolv.conf if IP4_NAMESERVERS is defined, it's not safe to do so
otherwise.
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