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

---
- name: Stop if either kube_control_plane or kube_node group is empty
  assert:
    that: "groups.get('{{ item }}')"
  with_items:
    - kube_control_plane
    - kube_node
  run_once: true
  when: not ignore_assert_errors

- name: Stop if etcd group is empty in external etcd mode
  assert:
    that: groups.get('etcd')
    fail_msg: "Group 'etcd' cannot be empty in external etcd mode"
  run_once: true
  when:
    - not ignore_assert_errors
    - etcd_deployment_type != "kubeadm"

- name: Stop if non systemd OS type
  assert:
    that: ansible_service_mgr == "systemd"
  when: not ignore_assert_errors

- name: Stop if unknown OS
  assert:
    that: ansible_distribution in ['RedHat', 'CentOS', 'Fedora', 'Ubuntu', 'Debian', 'Flatcar', 'Flatcar Container Linux by Kinvolk', 'Suse', 'openSUSE Leap', 'openSUSE Tumbleweed', 'ClearLinux', 'OracleLinux', 'AlmaLinux', 'Rocky', 'Amazon']
    msg: "{{ ansible_distribution }} is not a known OS"
  when: not ignore_assert_errors

- name: Stop if unknown network plugin
  assert:
    that: kube_network_plugin in ['calico', 'canal', 'flannel', 'weave', 'cloud', 'cilium', 'cni','kube-ovn', 'kube-router', 'macvlan']
    msg: "{{ kube_network_plugin }} is not supported"
  when:
    - kube_network_plugin is defined
    - not ignore_assert_errors

- name: Stop if unsupported version of Kubernetes
  assert:
    that: kube_version is version(kube_version_min_required, '>=')
    msg: "The current release of Kubespray only support newer version of Kubernetes than {{ kube_version_min_required }} - You are trying to apply {{ kube_version }}"
  when: not 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: 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 }}" }
  when: not ignore_assert_errors

- name: Stop if even number of etcd hosts
  assert:
    that: groups.etcd|length is not divisibleby 2
  when:
    - not ignore_assert_errors
    - inventory_hostname in groups.get('etcd',[])

- name: Stop if memory is too small for masters
  assert:
    that: ansible_memtotal_mb >= minimal_master_memory_mb
  when:
    - not ignore_assert_errors
    - inventory_hostname in groups['kube_control_plane']

- name: Stop if memory is too small for nodes
  assert:
    that: ansible_memtotal_mb >= minimal_node_memory_mb
  when:
    - not ignore_assert_errors
    - inventory_hostname in groups['kube_node']

- name: Stop when dynamic_kubelet_configuration enabled for kubernetes >= 1.22
  assert:
    that: not dynamic_kubelet_configuration
    msg: >
      Feature DynamicKubeletConfig is deprecated in 1.22 and will not move to GA.
      It is planned to be removed from Kubernetes in the version 1.23.
      Please use alternative ways to update kubelet configuration.      
  when:
    - kube_version is version('v1.22.0', '>=')

# 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)) | int <= (2 ** (32 - kube_network_node_prefix | int)) - 2 }}"
    msg: "Do not schedule more pods on a node than inet addresses are available."
  when:
    - not ignore_assert_errors
    - inventory_hostname in groups['k8s_cluster']
    - kube_network_node_prefix is defined
    - kube_network_plugin != 'calico'

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

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

- name: Stop if RBAC is not enabled when dashboard is enabled
  assert:
    that: rbac_enabled
  when:
    - dashboard_enabled
    - not 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"
    - not 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 and inventory_hostname in groups['kube_control_plane']
    - not ignore_assert_errors

- name: Stop if kernel version is too low
  assert:
    that: ansible_kernel.split('-')[0] is version('4.9.17', '>=')
  when:
    - kube_network_plugin == 'cilium' or cilium_deploy_additionally | default(false) | bool
    - not ignore_assert_errors

- name: Stop if bad hostname
  assert:
    that: inventory_hostname is 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"
  when: not ignore_assert_errors

- name: check cloud_provider value
  assert:
    that: cloud_provider in ['gce', 'aws', 'azure', 'openstack', 'vsphere', 'oci', 'external']
    msg: "If set the 'cloud_provider' var must be set either to 'gce', 'aws', 'azure', 'openstack', 'vsphere', 'oci' or 'external'"
  when:
    - cloud_provider is defined
    - not ignore_assert_errors
  tags:
    - cloud-provider
    - facts

- name: "Check that kube_service_addresses is a network range"
  assert:
    that:
      - kube_service_addresses | ipaddr('net')
    msg: "kube_service_addresses = '{{ 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('net')
    msg: "kube_pods_subnet = '{{ 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: "Check that IP range is enough for the nodes"
  assert:
    that:
      - 2 ** (kube_network_node_prefix - kube_pods_subnet | ipaddr('prefix')) >= groups['k8s_cluster'] | length
    msg: "Not enough IPs are available for the desired node count."
  run_once: yes

- name: Stop if unknown dns mode
  assert:
    that: dns_mode in ['coredns', 'coredns_dual', 'manual', 'none']
    msg: "dns_mode can only be '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|d('script') in ['script', 'none']
    msg: "cert_management can only be 'script' or 'none'"
  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

- name: Stop if etcd deployment type is not host, docker or kubeadm
  assert:
    that: etcd_deployment_type in ['host', 'docker', 'kubeadm']
    msg: "The etcd deployment type, 'etcd_deployment_type', must be host, docker or kubeadm"
  when:
    - inventory_hostname in groups.get('etcd',[])

- name: Stop if container manager is not docker, crio or containerd
  assert:
    that: container_manager in ['docker', 'crio', 'containerd']
    msg: "The container manager, 'container_manager', must be docker, crio or containerd"
  run_once: true

- name: Stop if etcd deployment type is not host or kubeadm when container_manager != docker
  assert:
    that: etcd_deployment_type in ['host', 'kubeadm']
    msg: "The etcd deployment type, 'etcd_deployment_type', must be host or kubeadm when container_manager is not docker"
  when:
    - inventory_hostname in groups.get('etcd',[])
    - container_manager != 'docker'

# TODO: Clean this task up when we drop backward compatibility support for `etcd_kubeadm_enabled`
- name: Stop if etcd deployment type is not host or kubeadm when container_manager != docker and etcd_kubeadm_enabled is not defined
  block:
    - name: Warn the user if they are still using `etcd_kubeadm_enabled`
      debug:
        msg: >
          "WARNING! => `etcd_kubeadm_enabled` is deprecated and will be removed in a future release.
          You can set `etcd_deployment_type` to `kubeadm` instead of setting `etcd_kubeadm_enabled` to `true`."          
      changed_when: true

    - name: Stop if `etcd_kubeadm_enabled` is defined and `etcd_deployment_type` is not `kubeadm` or `host`
      assert:
        that: etcd_deployment_type == 'kubeadm'
        msg: >
          It is not possible to use `etcd_kubeadm_enabled` when `etcd_deployment_type` is set to {{ etcd_deployment_type }}.
          Unset the `etcd_kubeadm_enabled` variable and set `etcd_deployment_type` to desired deployment type (`host`, `kubeadm`, `docker`) instead."          
      when: etcd_kubeadm_enabled
  run_once: yes
  when: etcd_kubeadm_enabled is defined

- name: Stop if download_localhost is enabled but download_run_once is not
  assert:
    that: download_run_once
    msg: "download_localhost requires enable download_run_once"
  when: download_localhost

- name: Stop if kata_containers_enabled is enabled when container_manager is docker
  assert:
    that: container_manager != 'docker'
    msg: "kata_containers_enabled support only for containerd and crio-o. See https://github.com/kata-containers/documentation/blob/1.11.4/how-to/run-kata-with-k8s.md#install-a-cri-implementation for details"
  when: kata_containers_enabled

- name: Stop if kata_containers_version is >= 2.3.0 and kube_version < 1.22.0
  assert:
    that: kube_version is version('v1.22.0', '>')
    msg: "Kata containers version 2.3.0 is compatible with Kubernetes 1.22.0+"
  when:
    - kata_containers_enabled
    - kata_containers_version is version ('2.3.0', '>=')

- name: Stop if gvisor_enabled is enabled when container_manager is not containerd
  assert:
    that: container_manager == 'containerd'
    msg: "gvisor_enabled support only compatible with containerd. See https://github.com/kubernetes-sigs/kubespray/issues/7650 for details"
  when: gvisor_enabled

- name: Stop if download_localhost is enabled for Flatcar Container Linux
  assert:
    that: ansible_os_family not in ["Flatcar", "Flatcar Container Linux by Kinvolk"]
    msg: "download_run_once not supported for Flatcar Container Linux"
  when: download_run_once or download_force_cache

- name: Ensure minimum containerd version
  assert:
    that: containerd_version is version(containerd_min_version_required, '>=')
    msg: "containerd_version is too low. Minimum version {{ containerd_min_version_required }}"
  run_once: yes
  when:
    - containerd_version not in ['latest', 'edge', 'stable']
    - container_manager == 'containerd'

- name: Stop if using deprecated containerd_config variable
  assert:
    that: containerd_config is not defined
    msg: "Variable containerd_config is now deprecated. See https://github.com/kubernetes-sigs/kubespray/blob/master/inventory/sample/group_vars/all/containerd.yml for details."
  when:
    - containerd_config is defined
    - not ignore_assert_errors

- name: Stop if auto_renew_certificates is enabled when certificates are managed externally (kube_external_ca_mode is true)
  assert:
    that: not auto_renew_certificates
    msg: "Variable auto_renew_certificates must be disabled when CA are managed externally:  kube_external_ca_mode = true"
  when:
    - kube_external_ca_mode
    - not ignore_assert_errors