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Update kubelet systemd service default allowed IP addresses for cluster hardening #11061

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Apr 11, 2024
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Update kubelet systemd service default allowed IP addresses for cluster hardening #11061

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2 changes: 1 addition & 1 deletion docs/hardening.md
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Original file line number Diff line number Diff line change
Expand Up @@ -105,7 +105,7 @@ kubelet_systemd_hardening: true
# IP addresses, kubelet_secure_addresses allows you
# to specify the IP from which the kubelet
# will receive the packets.
kubelet_secure_addresses: "192.168.10.110 192.168.10.111 192.168.10.112"
kubelet_secure_addresses: "localhost link-local {{ kube_pods_subnet }} 192.168.10.110 192.168.10.111 192.168.10.112"

# additional configurations
kube_owner: root
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5 changes: 3 additions & 2 deletions roles/kubernetes/node/defaults/main.yml
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Expand Up @@ -24,10 +24,11 @@ kubelet_kubelet_cgroups_cgroupfs: "/system.slice/kubelet.service"
kubelet_systemd_hardening: false

# List of secure IPs for kubelet
kubelet_secure_addresses: >-
{%- for host in groups['kube_control_plane'] -%}
kube_node_addresses: >-
{%- for host in (groups['kube_control_plane'] + groups['kube_node'] + groups['etcd']) | unique -%}
{{ hostvars[host]['ip'] | default(fallback_ips[host]) }}{{ ' ' if not loop.last else '' }}
{%- endfor -%}
kubelet_secure_addresses: "localhost link-local {{ kube_pods_subnet }} {{ kube_node_addresses }}"

# Reserve this space for kube resources
# Set to true to reserve resources for kube daemons
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