c12s-kubespray/roles/kubernetes/preinstall/tasks/0020-verify-settings.yml

---
- name: Stop if ansible version is too low
  assert:
    that:
      - ansible_version.full|version_compare('2.3.0', '>=')
  run_once: yes

- name: Stop if either kube-master, kube-node or etcd is empty
  assert:
    that: groups.get('{{ item }}')
  with_items:
    - kube-master
    - kube-node
    - etcd
  run_once: true

- name: Stop if non systemd OS type
  assert:
    that: ansible_service_mgr == "systemd"
  ignore_errors: "{{ ignore_assert_errors }}"

- name: Stop if unknown OS
  assert:
    that: ansible_distribution in ['RedHat', 'CentOS', 'Fedora', 'Ubuntu', 'Debian', 'CoreOS', 'Container Linux by CoreOS', 'openSUSE Leap', 'openSUSE Tumbleweed']
  ignore_errors: "{{ ignore_assert_errors }}"

- name: Stop if unknown network plugin
  assert:
    that: kube_network_plugin in ['calico', 'canal', 'flannel', 'weave', 'cloud', 'cilium', 'contiv', 'kube-router']
  when: kube_network_plugin is defined
  ignore_errors: "{{ ignore_assert_errors }}"

- name: Stop if incompatible network plugin and cloudprovider
  assert:
    that: kube_network_plugin != 'calico'
    msg: "Azure and Calico are not compatible. See https://github.com/projectcalico/calicoctl/issues/949 for details."
  when: cloud_provider is defined and cloud_provider == 'azure'
  ignore_errors: "{{ ignore_assert_errors }}"

# simplify this items-list when   https://github.com/ansible/ansible/issues/15753  is resolved
- name: "Stop if known booleans are set as strings (Use JSON format on CLI: -e \"{'key': true }\")"
  assert:
    that: item.value|type_debug == 'bool'
    msg: "{{item.value}} isn't a bool"
  run_once: yes
  with_items:
    - { name: kubeadm_enabled, value: "{{ kubeadm_enabled }}" }
    - { name: download_run_once, value: "{{ download_run_once }}" }
    - { name: deploy_netchecker, value: "{{ deploy_netchecker }}" }
    - { name: download_always_pull, value: "{{ download_always_pull }}" }
    - { name: helm_enabled, value: "{{ helm_enabled }}" }
    - { name: openstack_lbaas_enabled, value: "{{ openstack_lbaas_enabled }}" }
  ignore_errors: "{{ ignore_assert_errors }}"

- name: Stop if even number of etcd hosts
  assert:
    that: groups.etcd|length is not divisibleby 2
  ignore_errors: "{{ ignore_assert_errors }}"

- name: Stop if memory is too small for masters
  assert:
    that: ansible_memtotal_mb >= 1500
  ignore_errors: "{{ ignore_assert_errors }}"
  when: inventory_hostname in groups['kube-master']

- name: Stop if memory is too small for nodes
  assert:
    that: ansible_memtotal_mb >= 1024
  ignore_errors: "{{ ignore_assert_errors }}"
  when: inventory_hostname in groups['kube-node']

# This assertion will fail on the safe side: One can indeed schedule more pods
# on a node than the CIDR-range has space for when additional pods use the host
# network namespace. It is impossible to ascertain the number of such pods at
# provisioning time, so to establish a guarantee, we factor these out.
# NOTICE: the check blatantly ignores the inet6-case
- name: Guarantee that enough network address space is available for all pods
  assert:
    that: "{{ kubelet_max_pods | default(110) <= (2 ** (32 - kube_network_node_prefix)) - 2 }}"
    msg: "Do not schedule more pods on a node than inet addresses are available."
  ignore_errors: "{{ ignore_assert_errors }}"
  when:
    - inventory_hostname in groups['kube-node']
    - kube_network_node_prefix is defined

- name: Stop if ip var does not match local ips
  assert:
    that: ip in ansible_all_ipv4_addresses
  ignore_errors: "{{ ignore_assert_errors }}"
  when: ip is defined

- name: Stop if access_ip is not pingable
  command: ping -c1 {{ access_ip }}
  when: access_ip is defined
  ignore_errors: "{{ ignore_assert_errors }}"

- name: Stop if RBAC is not enabled when dashboard is enabled
  assert:
    that: rbac_enabled
  when: dashboard_enabled
  ignore_errors: "{{ ignore_assert_errors }}"

- name: Stop if RBAC is not enabled when OCI cloud controller is enabled
  assert:
    that: rbac_enabled
  when: cloud_provider is defined and cloud_provider == "oci"
  ignore_errors: "{{ ignore_assert_errors }}"

- name: Stop if RBAC and anonymous-auth are not enabled when insecure port is disabled
  assert:
    that: rbac_enabled and kube_api_anonymous_auth
  when: kube_apiserver_insecure_port == 0
  ignore_errors: "{{ ignore_assert_errors }}"

- name: Stop if kernel version is too low
  assert:
    that: ansible_kernel.split('-')[0]|version_compare('4.8', '>=')
  when: kube_network_plugin == 'cilium'
  ignore_errors: "{{ ignore_assert_errors }}"

- name: Stop if bad hostname
  assert:
    that: inventory_hostname | match("[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*$")
    msg: "Hostname must consist of lower case alphanumeric characters, '.' or '-', and must start and end with an alphanumeric character"
  ignore_errors: "{{ ignore_assert_errors }}"

- name: check cloud_provider value
  assert:
    that: cloud_provider in ['generic', 'gce', 'aws', 'azure', 'openstack', 'vsphere', 'oci', 'external']
    msg: "If set the 'cloud_provider' var must be set either to 'generic', 'gce', 'aws', 'azure', 'openstack', 'vsphere', or external"
  when:
    - cloud_provider is defined

  ignore_errors: "{{ ignore_assert_errors }}"
  tags:
    - cloud-provider
    - facts

- name: "Get current version of calico cluster version"
  shell: "{{ bin_dir }}/calicoctl version  | grep 'Cluster Version' | awk '{ print $3}'"
  register: calico_version_on_server
  run_once: yes
  delegate_to: "{{ groups['kube-master'][0] }}"


- name: "Check that calico version is enought for upgrade"
  assert:
    that:
      - calico_version_on_server.stdout|version_compare('v2.6.5', '>=')
    msg: "Your version of calico is not fresh enough for upgrade. Minimum version v2.6.5"
  when:
    - 'calico_version_on_server.stdout is defined'
    - 'calico_version_on_server.stdout != ""'
    - inventory_hostname == groups['kube-master'][0]
  run_once: yes

- name: "Check that kube_service_addresses is a network range"
  assert:
    that:
      - kube_service_addresses | ipaddr
    msg: "kube_service_addresses is not a valid network range"
  run_once: yes

- name: "Check that kube_pods_subnet is a network range"
  assert:
    that:
      - kube_pods_subnet | ipaddr
    msg: "kube_pods_subnet is not a valid network range"
  run_once: yes

- name: "Check that kube_pods_subnet does not collide with kube_service_addresses"
  assert:
    that:
      - kube_pods_subnet | ipaddr(kube_service_addresses) | string == 'None'
    msg: "kube_pods_subnet cannot be the same network segment as kube_service_addresses"
  run_once: yes

- name: Stop if unknown dns mode
  assert:
    that: dns_mode in ['dnsmasq_kubedns', 'kubedns', 'coredns', 'coredns_dual', 'manual', 'none']
    msg: "dns_mode can only be 'dnsmasq_kubedns', 'kubedns', 'coredns', 'coredns_dual', 'manual' or 'none'"
  when: dns_mode is defined
  run_once: true

- name: Stop if unknown kube proxy mode
  assert:
    that: kube_proxy_mode in ['iptables', 'ipvs']
    msg: "kube_proxy_mode can only be 'iptables' or 'ipvs'"
  when: kube_proxy_mode is defined
  run_once: true

- name: Stop if unknown cert_management
  assert:
    that: cert_management in ['script', 'vault']
    msg: "cert_management can only be 'script' or 'vault'"
  when: cert_management is defined
  run_once: true

- name: Stop if unknown resolvconf_mode
  assert:
    that: resolvconf_mode in ['docker_dns', 'host_resolvconf', 'none']
    msg: "resolvconf_mode can only be 'docker_dns', 'host_resolvconf' or 'none'"
  when: resolvconf_mode is defined
  run_once: true