ansible-collections/kubernetes
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kubernetes/roles/nfc_kubernetes/templates/iptables-kubernetes.rules.j2

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Django/Jinja
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#
# IP Tables Firewall Rules for Kubernetes
#
# Managed By ansible/collection/kubernetes
#
# Dont edit this file directly as it will be overwritten. To grant a host API access
# edit the cluster config, adding the hostname/ip to path kubernetes_config.cluster.access
#
# This file is periodicly called by cron
#
{% set data = namespace(firewall_rules=[]) -%}
{%- if ansible_host is regex('^[a-z]') and ':' not in ansible_host -%} {#- Convert DNs name to IP Address -#}
{%- if ipv6 | default(false) -%}
{%- set ansible_host = query('community.dns.lookup', ansible_host + '.', type='AAAA' ) -%}
{%- else -%}
{%- set ansible_host = query('community.dns.lookup', ansible_host + '.', type='A' ) -%}
{%- endif -%}
{%- if ansible_host | list | length > 0 -%} {#- Convert dns lookup to list, and select the first item -#}
{%- set ansible_host = ansible_host | from_yaml_all | list -%}
{%- set ansible_host = ansible_host[0] -%}
{%- endif -%}
{%- endif -%}
{%- for kubernetes_host in groups[kubernetes_config.cluster.group_name | default('me_is_optional')] | default([]) -%}
{%- set kubernetes_host = hostvars[kubernetes_host].ansible_host -%}
{%- if kubernetes_host is regex('^[a-z]') and ':' not in kubernetes_host -%} {#- Convert DNs name to IP Address -#}
{%- if ipv6 | default(false) -%}
{%- set kubernetes_host = query('community.dns.lookup', kubernetes_host + '.', type='AAAA' ) -%}
{%- else -%}
{%- set kubernetes_host = query('community.dns.lookup', kubernetes_host + '.', type='A' ) -%}
{%- endif -%}
{%- if
kubernetes_host is iterable
and
kubernetes_host is not string
-%} {#- Convert dns lookup to list, and select the first item -#}
{%- set kubernetes_host = kubernetes_host | from_yaml_all | list -%}
{%- set kubernetes_host = kubernetes_host[0] | default('') -%}
{%- endif -%}
{%- endif -%}
{%- if kubernetes_host != '' -%}
{%- for master_host in groups['kubernetes_master'] | default([]) -%}
{%- if master_host in groups[kubernetes_config.cluster.group_name | default('me_is_optional')] | default([]) -%}
{%- set master_host = hostvars[master_host].ansible_host -%}
{%- if master_host is regex('^[a-z]') and ':' not in master_host -%} {#- Convert DNs name to IP Address -#}
{%- if ipv6 | default(false) -%}
{%- set master_host = query('community.dns.lookup', master_host + '.', type='AAAA' ) -%}
{%- else -%}
{%- set master_host = query('community.dns.lookup', master_host + '.', type='A' ) -%}
{%- endif -%}
{%- if master_host | list | length > 0 -%} {#- Convert dns lookup to list, and select the first item -#}
{%- set master_host = master_host | from_yaml_all | list -%}
{%- set master_host = master_host[0] -%}
{%- endif -%}
{%- endif -%}
{%- if nfc_role_kubernetes_master | default(false) | bool -%}
{%- if
master_host == kubernetes_host
and
master_host != ansible_host
and
(
(
ipv6 | default(false)
and
':' in master_host
)
or
(
not ipv6 | default(false)
and
'.' in master_host
)
)
-%}
{#- master hosts only -#}
{%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-embedded-etcd -s ' + master_host + ' -j ACCEPT'] -%}
{# {%- set data.firewall_rules = data.firewall_rules + ['-I INPUT -s ' + master_host + ' -p tcp -m multiport --dports 2380 -j ACCEPT'] -%} #}
{%- if '-I kubernetes-api -s ' + master_host + ' -j ACCEPT' not in data.firewall_rules -%}
{%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-api -s ' + master_host + ' -j ACCEPT'] -%}
{%- endif -%}
{%- endif -%}
{%- endif -%}
{%- endif -%}
{%- endfor -%}
{%- if
ansible_host != kubernetes_host
and
(
(
ipv6 | default(false)
and
':' in kubernetes_host
)
or
(
not ipv6 | default(false)
and
'.' in kubernetes_host
)
)
-%}
{#- All cluster Hosts -#}
{%- if
nfc_role_kubernetes_master | default(false) | bool
and
kubernetes_host not in groups['kubernetes_master']
and
'-I kubernetes-api -s ' + kubernetes_host + ' -j ACCEPT' not in data.firewall_rules
-%}
{%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-api -s ' + kubernetes_host + ' -j ACCEPT'] -%}
{%- endif -%}
{%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-flannel-vxlan -s ' + kubernetes_host + ' -j ACCEPT'] -%}
{%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-kubelet-metrics -s ' + kubernetes_host + ' -j ACCEPT'] -%}
{%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-flannel-wg-four -s ' + kubernetes_host + ' -j ACCEPT'] -%}
{%- if false -%}{# see IPv6 is disabled #}
{%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-flannel-wg-six -s ' + kubernetes_host + ' -j ACCEPT'] -%}
{%- endif -%}
{%- if false -%}{# see Installation-manifest-Calico_Cluster.yaml.j2 bgp is disabled #}
{%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-calico-bgp -s ' + kubernetes_host + ' -j ACCEPT'] -%}
{%- endif -%}
{%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-calico-typha -s ' + kubernetes_host + ' -j ACCEPT'] -%}
{%- if nfc_kubernetes_enable_metallb | default(false) -%}
{%- set data.firewall_rules = data.firewall_rules + ['-I metallb-l2-tcp -s ' + kubernetes_host + ' -j ACCEPT'] -%}
{%- set data.firewall_rules = data.firewall_rules + ['-I metallb-l2-udp -s ' + kubernetes_host + ' -j ACCEPT'] -%}
{%- endif -%}
{%- endif -%}
{%- endif -%}
{%- endfor -%}
{%- if nfc_role_kubernetes_master | default(false) | bool -%}
{%- if host_external_ip is defined -%}
{%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-api -s ' + host_external_ip + ' -m comment --comment "hosts configured external IP" -j ACCEPT'] -%}
{%- endif -%}
{%- for api_client in kubernetes_config.cluster.access | default([]) -%}
{%- if api_client is regex('^[a-z]') and ':' not in api_client -%} {#- Convert DNs name to IP Address -#}
{%- set api_client_dns_name = api_client -%}
{%- if ipv6 | default(false) -%}
{%- set api_client = query('community.dns.lookup', api_client + '.', type='AAAA' ) -%}
{%- else -%}
{%- set api_client = query('community.dns.lookup', api_client + '.', type='A' ) -%}
{%- endif -%}
{%- if api_client | list | length > 0 -%} {#- Convert dns lookup to list, and select the first item -#}
{%- set api_client = api_client | from_yaml_all | list -%}
{%- set api_client = api_client[0] -%}
{%- endif -%}
{%- endif -%}
{%- if
api_client != ansible_host
and
(
(
ipv6 | default(false)
and
':' in api_client
)
or
(
not ipv6 | default(false)
and
'.' in api_client
)
)
-%}
{#- Hosts allowed to access API -#}
{%- set data.firewall_rules = data.firewall_rules + ['-I kubernetes-api -s ' + api_client + ' -m comment --comment "host: ' + api_client_dns_name | default(api_client) + '" -j ACCEPT'] -%}
{%- endif -%}
{%- endfor %}
{%- endif %}
*filter
{# -N kubernetes-embedded-etcd
-A kubernetes-embedded-etcd -j RETURN
-A INPUT -p tcp -m multiport --dports 2379,2380 -m comment --comment "etcd. Servers only" -j kubernetes-embedded-etcd
-N kubernetes-api
-A kubernetes-api -j RETURN
-A INPUT -p tcp --dport 6443 -m comment --comment "Kubernetes API access. All Cluster hosts and end users" -j kubernetes-api
-N kubernetes-flannel-vxlan
-A kubernetes-flannel-vxlan -j RETURN
-A INPUT -p udp --dport 8472 -m comment --comment "Flannel. All cluster hosts" -j kubernetes-flannel-vxlan
-N kubernetes-kubelet-metrics
-A kubernetes-kubelet-metrics -j RETURN
-A INPUT -p tcp --dport 10250 -m comment --comment "Kubernetes Metrics. All cluster hosts" -j kubernetes-kubelet-metrics
-N kubernetes-flannel-wg-four
-A kubernetes-flannel-wg-four -j RETURN
-A INPUT -p udp --dport 51820 -m comment --comment "Flannel Wiregaurd IPv4. All cluster hosts" -j kubernetes-flannel-wg-four
-N kubernetes-flannel-wg-six
-A kubernetes-flannel-wg-six -j RETURN
-A INPUT -p udp --dport 51821 -m comment --comment "Flannel Wiregaurd IPv6. All cluster hosts" -j kubernetes-flannel-wg-six #}
{% if data.firewall_rules | length | int > 0 -%}
{% for rule in data.firewall_rules -%}
{{ rule }}
{% endfor -%}
{% endif -%}
{#- #-I INPUT -s 192.168.1.0/24 -p tcp -m multiport --dports 6443 -j ACCEPT
#-I INPUT -s 192.168.1.0/24 -p tcp -m multiport --dports 179 -j ACCEPT
#-I INPUT -s 192.168.1.0/24 -p tcp -m multiport --dports 10250 -j ACCEPT
#-I INPUT -s 192.168.1.0/24 -p udp -m multiport --dports 4789 -j ACCEPT
#-I INPUT -s 192.168.1.0/24 -p tcp -m multiport --dports 2379 -j ACCEPT
#-I INPUT -s 192.168.1.0/24 -p tcp -m multiport --dports 2380 -j ACCEPT
-I INPUT -p tcp -m multiport --dports 6443 -j ACCEPT
-I INPUT -p tcp -m multiport --dports 179 -j ACCEPT
-I INPUT -p tcp -m multiport --dports 10250 -j ACCEPT
-I INPUT -p udp -m multiport --dports 4789 -j ACCEPT
-I INPUT -p tcp -m multiport --dports 2379 -j ACCEPT
-I INPUT -p tcp -m multiport --dports 2380 -j ACCEPT #}
COMMIT
{# iptables -I kubernetes-api -s nww-au1.networkedweb.com -j ACCEPT #}
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