kubespray/roles/docker/tasks/set_facts_dns.yml

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---
- name: set dns server for docker
set_fact:
docker_dns_servers: |-
{%- if dns_mode == 'kubedns' -%}
{{ [ skydns_server ] }}
{%- elif dns_mode == 'dnsmasq_kubedns' -%}
{{ [ dns_server ] }}
{%- endif -%}
- name: set base docker dns facts
set_fact:
docker_dns_search_domains:
- 'default.svc.{{ dns_domain }}'
- 'svc.{{ dns_domain }}'
docker_dns_options:
- ndots:{{ ndots }}
- timeout:2
- attempts:2
- name: add upstream dns servers (only when dnsmasq is not used)
set_fact:
docker_dns_servers: "{{ docker_dns_servers + upstream_dns_servers|default([]) }}"
when: dns_mode == 'kubedns'
- name: add global searchdomains
set_fact:
docker_dns_search_domains: "{{ docker_dns_search_domains + searchdomains|default([]) }}"
- name: check system nameservers
shell: grep "^nameserver" /etc/resolv.conf | sed 's/^nameserver\s*//'
changed_when: False
register: system_nameservers
check_mode: no
- name: check system search domains
shell: grep "^search" /etc/resolv.conf | sed 's/^search\s*//'
changed_when: False
register: system_search_domains
check_mode: no
- name: add system nameservers to docker options
set_fact:
docker_dns_servers: "{{ docker_dns_servers | union(system_nameservers.stdout_lines) | unique }}"
when: system_nameservers.stdout != ""
- name: add system search domains to docker options
set_fact:
docker_dns_search_domains: "{{ docker_dns_search_domains | union(system_search_domains.stdout.split(' ')|default([])) | unique }}"
when: system_search_domains.stdout != ""
- name: check number of nameservers
fail:
msg: "Too many nameservers. You can relax this check by set docker_dns_servers_strict=no and we will only use the first 3."
when: docker_dns_servers|length > 3 and docker_dns_servers_strict|bool
- name: rtrim number of nameservers to 3
set_fact:
docker_dns_servers: "{{ docker_dns_servers[0:3] }}"
when: docker_dns_servers|length > 3 and not docker_dns_servers_strict|bool
- name: check number of search domains
fail:
msg: "Too many search domains"
when: docker_dns_search_domains|length > 6
- name: check length of search domains
fail:
msg: "Search domains exceeded limit of 256 characters"
when: docker_dns_search_domains|join(' ')|length > 256