a15d626771
In order to enable offline/intranet installation cases: * Move DNS/resolvconf configuration to preinstall role. Remove skip_dnsmasq_k8s var as not needed anymore. * Preconfigure DNS stack early, which may be the case when downloading artifacts from intranet repositories. Do not configure K8s DNS resolvers for hosts /etc/resolv.conf yet early (as they may be not existing). * Reconfigure K8s DNS resolvers for hosts only after kubedns/dnsmasq was set up and before K8s apps to be created. * Move docker install task to early stage as well and unbind it from the etcd role's specific install path. Fix external flannel dependency on docker role handlers. Also fix the docker restart handlers' steps ordering to match the expected sequence (the socket then the service). * Add default resolver fact, which is the cloud provider specific and remove hardcoded GCE resolver. * Reduce default ndots for hosts /etc/resolv.conf to 2. Multiple search domains combined with high ndots values lead to poor performance of DNS stack and make ansible workers to fail very often with the "Timeout (12s) waiting for privilege escalation prompt:" error. * Update docs. Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
170 lines
4.6 KiB
YAML
170 lines
4.6 KiB
YAML
---
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- name: check resolvconf
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shell: which resolvconf
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register: resolvconf
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ignore_errors: yes
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changed_when: false
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tags: facts
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- name: check kubelet
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stat:
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path: "{{ bin_dir }}/kubelet"
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register: kubelet
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changed_when: false
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tags: facts
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- name: check if early DNS configuration stage
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set_fact:
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dns_early: >-
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{%- if kubelet.stat.exists -%}false{%- else -%}true{%- endif -%}
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tags: facts
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- name: target resolv.conf file
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set_fact:
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resolvconffile: >-
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{%- if resolvconf.rc == 0 -%}/etc/resolvconf/resolv.conf.d/head{%- else -%}/etc/resolv.conf{%- endif -%}
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when: ansible_os_family != "CoreOS"
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tags: facts
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- name: target temporary resolvconf cloud init file
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set_fact:
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resolvconffile: /tmp/resolveconf_cloud_init_conf
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when: ansible_os_family == "CoreOS"
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tags: facts
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- name: create temporary resolveconf cloud init file
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command: cp -f /etc/resolv.conf "{{ resolvconffile }}"
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when: ansible_os_family == "CoreOS"
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- name: generate search domains to resolvconf
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set_fact:
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searchentries:
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"{{ ([ 'default.svc.' + dns_domain, 'svc.' + dns_domain ] + searchdomains|default([])) | join(' ') }}"
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tags: facts
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- name: decide on dns server IP
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set_fact:
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dns_server_real: >-
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{%- if dns_early|bool -%}{{default_resolver}}{%- else -%}{{dns_server}}{%- endif -%}
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- name: pick dnsmasq cluster IP or default resolver
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set_fact:
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dnsmasq_server: |-
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{%- if skip_dnsmasq|bool and not dns_early|bool -%}
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{{ [ skydns_server ] + upstream_dns_servers|default([]) }}
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{%- elif dns_early|bool -%}
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{{ [ dns_server_real ] + upstream_dns_servers|default([]) }}
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{%- else -%}
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{{ [ dns_server ] }}
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{%- endif -%}
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tags: facts
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- name: generate nameservers to resolvconf
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set_fact:
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nameserverentries:
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"{{ dnsmasq_server|default([]) + nameservers|default([]) }}"
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tags: facts
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- name: Remove search and nameserver options from resolvconf head
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lineinfile:
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dest: /etc/resolvconf/resolv.conf.d/head
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state: absent
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regexp: "^{{ item }}.*$"
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backup: yes
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follow: yes
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with_items:
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- search
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- nameserver
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when: resolvconf.rc == 0
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notify: Preinstall | update resolvconf
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- name: Remove search and nameserver options from resolvconf cloud init temporary file
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lineinfile:
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dest: "{{resolvconffile}}"
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state: absent
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regexp: "^{{ item }}.*$"
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backup: yes
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follow: yes
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with_items:
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- search
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- nameserver
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when: ansible_os_family == "CoreOS"
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notify: Preinstall | update resolvconf for CoreOS
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- name: Add search domains to resolvconf file
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lineinfile:
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line: "search {{searchentries}}"
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dest: "{{resolvconffile}}"
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state: present
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insertbefore: BOF
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backup: yes
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follow: yes
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notify: Preinstall | update resolvconf
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- name: Add nameservers to resolv.conf
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blockinfile:
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dest: "{{resolvconffile}}"
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block: |-
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{% for item in nameserverentries -%}
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nameserver {{ item }}
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{% endfor %}
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state: present
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insertafter: "^search default.svc.*$"
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create: yes
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backup: yes
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follow: yes
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marker: "# Ansible nameservers {mark}"
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notify: Preinstall | update resolvconf
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- name: Add options to resolv.conf
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lineinfile:
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line: options {{ item }}
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dest: "{{resolvconffile}}"
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state: present
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regexp: "^options.*{{ item }}$"
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insertafter: EOF
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backup: yes
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follow: yes
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with_items:
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- ndots:{{ ndots }}
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- timeout:2
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- attempts:2
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notify: Preinstall | update resolvconf
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- name: Remove search and nameserver options from resolvconf base
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lineinfile:
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dest: /etc/resolvconf/resolv.conf.d/base
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state: absent
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regexp: "^{{ item }}.*$"
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backup: yes
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follow: yes
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with_items:
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- search
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- nameserver
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when: resolvconf.rc == 0
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notify: Preinstall | update resolvconf
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- name: disable resolv.conf modification by dhclient
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copy: src=dhclient_nodnsupdate dest=/etc/dhcp/dhclient-enter-hooks.d/znodnsupdate mode=0755
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notify: Preinstall | restart network
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when: ansible_os_family == "Debian"
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- name: disable resolv.conf modification by dhclient
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copy: src=dhclient_nodnsupdate dest=/etc/dhcp/dhclient.d/nodnsupdate mode=u+x
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notify: Preinstall | restart network
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when: ansible_os_family == "RedHat"
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- name: get temporary resolveconf cloud init file content
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command: cat {{ resolvconffile }}
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register: cloud_config
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when: ansible_os_family == "CoreOS"
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- name: persist resolvconf cloud init file
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template:
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dest: "{{resolveconf_cloud_init_conf}}"
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src: resolvconf.j2
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owner: root
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mode: 0644
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notify: Preinstall | update resolvconf for CoreOS
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when: ansible_os_family == "CoreOS"
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