kubespray/roles/kubernetes/preinstall/tasks/0040-verify-settings.yml

---
- name: Stop if any host not in '--limit' does not have a fact cache
  vars:
    uncached_hosts: "{{ hostvars | dict2items | selectattr('value.ansible_default_ipv6', 'undefined') | selectattr('value.ansible_default_ipv4', 'undefined') | map(attribute='key') }}"
    excluded_hosts: "{{ groups['k8s_cluster'] | difference(query('inventory_hostnames', ansible_limit)) }}"
  assert:
    that: uncached_hosts | intersect(excluded_hosts) == []
    fail_msg: |
      Kubespray does not support '--limit' without a populated facts cache for the excluded hosts.
      Please run the facts.yml playbook first without '--limit'.
      The following excluded hosts are not cached: {{ uncached_hosts | intersect(excluded_hosts) }}      
  run_once: true
  when:
    - ansible_limit is defined
    - not ignore_assert_errors

- name: Stop if kube_control_plane group is empty
  assert:
    that: groups.get( 'kube_control_plane' )
  run_once: true
  when: not ignore_assert_errors

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

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

- name: Stop if the os does not support
  assert:
    that: (allow_unsupported_distribution_setup | default(false)) or ansible_distribution in supported_os_distributions
    msg: "{{ ansible_distribution }} is not a known OS"
  when: not ignore_assert_errors

- name: Warn if `kube_network_plugin` is `none
  debug:
    msg: |
      "WARNING! => `kube_network_plugin` is set to `none`. The network configuration will be skipped.
      The cluster won't be ready to use, we recommend to select one of the available plugins"      
  when:
    - kube_network_plugin == 'none'

- 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

- name: "Stop if known booleans are set as strings (Use JSON format on CLI: -e \"{'key': true }\")"
  assert:
    that:
      - download_run_once | type_debug == 'bool'
      - deploy_netchecker | type_debug == 'bool'
      - download_always_pull | type_debug == 'bool'
      - helm_enabled | type_debug == 'bool'
      - openstack_lbaas_enabled | type_debug == 'bool'
  run_once: true
  when: not ignore_assert_errors

- name: Stop if even number of etcd hosts
  assert:
    that: groups.get('etcd', groups.kube_control_plane) | length is not divisibleby 2
  run_once: true
  when:
    - not ignore_assert_errors

- name: Stop if memory is too small for control plane nodes
  assert:
    that: ansible_memtotal_mb >= minimal_master_memory_mb
  when:
    - not ignore_assert_errors
    - ('kube_control_plane' in group_names)

- name: Stop if memory is too small for nodes
  assert:
    that: ansible_memtotal_mb >= minimal_node_memory_mb
  when:
    - not ignore_assert_errors
    - ('kube_node' in group_names)

# This command will fail if cgroups are not enabled on the node.
# For reference: https://kubernetes.io/docs/concepts/architecture/cgroups/#check-cgroup-version
- name: Stop if cgroups are not enabled on nodes
  command: stat -fc %T /sys/fs/cgroup/
  changed_when: false
  when: not ignore_assert_errors

# 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
    - ('k8s_cluster' in group_names)
    - kube_network_plugin not in ['calico', 'none']
    - ipv4_stack | bool

- name: Stop if ip var does not match local ips
  assert:
    that: (ip in ansible_all_ipv4_addresses) or (ip in ansible_all_ipv6_addresses)
    msg: "IPv4: '{{ ansible_all_ipv4_addresses }}' and IPv6: '{{ ansible_all_ipv6_addresses }}' do not contain '{{ ip }}'"
  when:
    - not ignore_assert_errors
    - ip is defined

- name: Ensure ping package
  package:
    # noqa: jinja[spacing]
    name: >-
          {%- if ansible_os_family == 'Debian' -%}
          iputils-ping
          {%- else -%}
          iputils
          {%- endif -%}          
    state: present
  when:
    - main_access_ip is defined
    - not ignore_assert_errors
    - ping_access_ip
    - not is_fedora_coreos
    - not ansible_os_family in ["Flatcar", "Flatcar Container Linux by Kinvolk"]

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

- 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 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 == 'external'
  when:
    - cloud_provider
    - not ignore_assert_errors
  tags:
    - cloud-provider
    - facts

- name: Check external_cloud_provider value
  assert:
    that: external_cloud_provider in ['hcloud', 'huaweicloud', 'oci', 'openstack', 'vsphere', 'manual']
  when:
    - cloud_provider == 'external'
    - not ignore_assert_errors
  tags:
    - cloud-provider
    - facts

- name: Warn if `enable_dual_stack_networks` is set
  debug:
    msg: "WARNING! => `enable_dual_stack_networks` deprecation. Please switch to using ipv4_stack and ipv6_stack."
  when:
    - enable_dual_stack_networks is defined

- name: "Check that kube_service_addresses is a network range"
  assert:
    that:
      - kube_service_addresses | ansible.utils.ipaddr('net')
    msg: "kube_service_addresses = '{{ kube_service_addresses }}' is not a valid network range"
  run_once: true
  when: ipv4_stack | bool

- name: "Check that kube_pods_subnet is a network range"
  assert:
    that:
      - kube_pods_subnet | ansible.utils.ipaddr('net')
    msg: "kube_pods_subnet = '{{ kube_pods_subnet }}' is not a valid network range"
  run_once: true
  when: ipv4_stack | bool

- name: "Check that kube_pods_subnet does not collide with kube_service_addresses"
  assert:
    that:
      - kube_pods_subnet | ansible.utils.ipaddr(kube_service_addresses) | string == 'None'
    msg: "kube_pods_subnet cannot be the same network segment as kube_service_addresses"
  run_once: true
  when: ipv4_stack | bool

- name: "Check that ipv4 IP range is enough for the nodes"
  assert:
    that:
      - 2 ** (kube_network_node_prefix - kube_pods_subnet | ansible.utils.ipaddr('prefix')) >= groups['k8s_cluster'] | length
    msg: "Not enough ipv4 IPs are available for the desired node count."
  when:
    - ipv4_stack | bool
    - kube_network_plugin != 'calico'
  run_once: true

- name: "Check that kube_service_addresses_ipv6 is a network range"
  assert:
    that:
      - kube_service_addresses_ipv6 | ansible.utils.ipaddr('net')
    msg: "kube_service_addresses_ipv6 = '{{ kube_service_addresses_ipv6 }}' is not a valid network range"
  run_once: true
  when: ipv6_stack | bool

- name: "Check that kube_pods_subnet_ipv6 is a network range"
  assert:
    that:
      - kube_pods_subnet_ipv6 | ansible.utils.ipaddr('net')
    msg: "kube_pods_subnet_ipv6 = '{{ kube_pods_subnet_ipv6 }}' is not a valid network range"
  run_once: true
  when: ipv6_stack | bool

- name: "Check that kube_pods_subnet_ipv6 does not collide with kube_service_addresses_ipv6"
  assert:
    that:
      - kube_pods_subnet_ipv6 | ansible.utils.ipaddr(kube_service_addresses_ipv6) | string == 'None'
    msg: "kube_pods_subnet_ipv6 cannot be the same network segment as kube_service_addresses_ipv6"
  run_once: true
  when: ipv6_stack | bool

- name: "Check that ipv6 IP range is enough for the nodes"
  assert:
    that:
      - 2 ** (kube_network_node_prefix_ipv6 - kube_pods_subnet_ipv6 | ansible.utils.ipaddr('prefix')) >= groups['k8s_cluster'] | length
    msg: "Not enough ipv6 IPs are available for the desired node count."
  when:
    - ipv6_stack | bool
    - kube_network_plugin != 'calico'
  run_once: true

- name: Stop if unsupported options selected
  assert:
    that:
      - kube_network_plugin in ['calico', 'flannel', 'weave', 'cloud', 'cilium', 'cni', 'kube-ovn', 'kube-router', 'macvlan', 'custom_cni', 'none']
      - dns_mode in ['coredns', 'coredns_dual', 'manual', 'none']
      - kube_proxy_mode in ['iptables', 'ipvs']
      - cert_management in ['script', 'none']
      - resolvconf_mode in ['docker_dns', 'host_resolvconf', 'none']
      - etcd_deployment_type in ['host', 'docker', 'kubeadm']
      - etcd_deployment_type in ['host', 'kubeadm'] or container_manager == 'docker'
      - container_manager in ['docker', 'crio', 'containerd']
    msg: The selected choice is not supported
  run_once: true

- name: Stop if /etc/resolv.conf has no configured nameservers
  assert:
    that: configured_nameservers | length>0
    fail_msg: "nameserver should not be empty in /etc/resolv.conf"
  when:
    - upstream_dns_servers | length == 0
    - not disable_host_nameservers
    - dns_mode in ['coredns', 'coredns_dual']

# TODO: Clean this task up after 2.28 is released
- name: Stop if etcd_kubeadm_enabled is defined
  run_once: true
  assert:
    that: etcd_kubeadm_enabled is not defined
    msg: |
      `etcd_kubeadm_enabled` is removed.
       You can set `etcd_deployment_type` to `kubeadm` instead of setting `etcd_kubeadm_enabled` to `true`."      

- 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 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: true
  when:
    - containerd_version not in ['latest', 'edge', 'stable']
    - container_manager == 'containerd'

- 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

- name: Verify that the packages list is sorted
  vars:
    pkgs_lists: "{{ pkgs.keys() | list }}"
  assert:
    that: "pkgs_lists | sort == pkgs_lists"
    fail_msg: "pkgs is not sorted: {{ pkgs_lists | ansible.utils.fact_diff(pkgs_lists | sort) }}"