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Add systemd_resolved_disable_stub_listener (#9875)

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This commit is contained in:
Andrei Costescu
2023-05-25 19:04:51 +02:00
committed by GitHub
parent 808524bed6
commit 96e875cd50
3 changed files with 9 additions and 1 deletions
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5
docs/dns-stack.md
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@@ -143,6 +143,11 @@ coredns_default_zone_cache_block: |
} }
``` ```
### systemd_resolved_disable_stub_listener
Whether or not to set `DNSStubListener=no` when using systemd-resolved. Defaults to `true` on Flatcar.
You might need to set it to `true` if CoreDNS fails to start with `address already in use` errors.
## DNS modes supported by Kubespray ## DNS modes supported by Kubespray
You can modify how Kubespray sets up DNS for your cluster with the variables ``dns_mode`` and ``resolvconf_mode``. You can modify how Kubespray sets up DNS for your cluster with the variables ``dns_mode`` and ``resolvconf_mode``.

3
roles/kubernetes/preinstall/defaults/main.yml
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@@ -140,3 +140,6 @@ redhat_os_family_extensions:
# Extending some distributions into the debian os family # Extending some distributions into the debian os family
debian_os_family_extensions: debian_os_family_extensions:
- "UnionTech OS Server 20" - "UnionTech OS Server 20"
# Sets DNSStubListener=no, useful if you get "0.0.0.0:53: bind: address already in use"
systemd_resolved_disable_stub_listener: "{{ ansible_os_family in ['Flatcar', 'Flatcar Container Linux by Kinvolk'] }}"

2
roles/kubernetes/preinstall/templates/resolved.conf.j2
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@@ -14,7 +14,7 @@ Domains={{ searchdomains|default([]) | join(' ') }}
#MulticastDNS=no #MulticastDNS=no
DNSSEC=no DNSSEC=no
Cache=no-negative Cache=no-negative
{% if ansible_os_family in ["Flatcar", "Flatcar Container Linux by Kinvolk"] %} {% if systemd_resolved_disable_stub_listener | bool %}
DNSStubListener=no DNSStubListener=no
{% else %} {% else %}
#DNSStubListener=yes #DNSStubListener=yes