diff options
author | Christian Pointner <equinox@spreadspace.org> | 2020-04-28 22:56:12 +0200 |
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committer | Christian Pointner <equinox@spreadspace.org> | 2020-04-28 22:56:12 +0200 |
commit | 150911af46705be2e2b0726cfb6e0446b2c7a3d4 (patch) | |
tree | 9a89a9b27efee24ee0b42104b9f920c699058309 /roles/kubernetes/net/kubeguard/node/templates | |
parent | vm/host: sort offset list before using it (diff) |
kubeguard: split up role
Diffstat (limited to 'roles/kubernetes/net/kubeguard/node/templates')
3 files changed, 104 insertions, 0 deletions
diff --git a/roles/kubernetes/net/kubeguard/node/templates/ifupdown.sh.j2 b/roles/kubernetes/net/kubeguard/node/templates/ifupdown.sh.j2 new file mode 100644 index 00000000..98b38cf4 --- /dev/null +++ b/roles/kubernetes/net/kubeguard/node/templates/ifupdown.sh.j2 @@ -0,0 +1,55 @@ +#!/bin/bash + +set -e + +CONF_D="/var/lib/kubeguard/" + +INET_IF="{{ ansible_default_ipv4.interface }}" + +POD_NET_CIDR="{{ kubernetes.pod_ip_range }}" + +{% set br_net = kubernetes.pod_ip_range | ipsubnet(kubernetes.pod_ip_range_size, kubeguard.node_index[inventory_hostname]) -%} +BR_IF="kube-br0" +BR_IP="{{ br_net | ipaddr(1) | ipaddr('address') }}" +BR_IP_CIDR="{{ br_net | ipaddr(1) }}" +BR_NET_CIDR="{{ br_net }}" + +TUN_IF="kube-wg0" +TUN_IP_CIDR="{{ kubernetes.pod_ip_range | ipsubnet(kubernetes.pod_ip_range_size, 0) | ipaddr(kubeguard.node_index[inventory_hostname]) }}" + + +case "$1" in + up) + # bring up bridge for local pods + ip link add dev "$BR_IF" type bridge + ip addr add dev "$BR_IF" "$BR_IP_CIDR" + ip link set up dev "$BR_IF" + iptables -t nat -A POSTROUTING -s "$BR_NET_CIDR" -o "$INET_IF" -j MASQUERADE + modprobe br_netfilter + + # bring up wireguard tunnel to other nodes + ip link add dev "$TUN_IF" type wireguard + ip addr add dev "$TUN_IF" "$TUN_IP_CIDR" + wg set "$TUN_IF" listen-port {{ kubeguard_wireguard_port }} private-key "$CONF_D/$TUN_IF.privatekey" + ip link set up dev "$TUN_IF" + + # make pods and service IPs reachable + # !!! use IP of bridge as source so we don't produce martians if direct-zones are involved!!! + ip route add "$POD_NET_CIDR" dev "$TUN_IF" src "$BR_IP" + ;; + down) + # bring down wireguard tunnel to other nodes + ip route del "$POD_NET_CIDR" dev "$TUN_IF" + ip link del dev "$TUN_IF" + + # bring down bridge for local pods + iptables -t nat -D POSTROUTING -s "$BR_NET_CIDR" -o "$INET_IF" -j MASQUERADE + ip link del dev "$BR_IF" + ;; + *) + echo "usage: $0 (up|down)" + exit 1 + ;; +esac + +exit 0 diff --git a/roles/kubernetes/net/kubeguard/node/templates/k8s.json.j2 b/roles/kubernetes/net/kubeguard/node/templates/k8s.json.j2 new file mode 100644 index 00000000..65b1357a --- /dev/null +++ b/roles/kubernetes/net/kubeguard/node/templates/k8s.json.j2 @@ -0,0 +1,12 @@ +{ + "cniVersion": "0.3.1", + "name": "k8s", + "type": "bridge", + "bridge": "kube-br0", + "isDefaultGateway": true, + "hairpinMode": true, + "ipam": { + "type": "host-local", + "subnet": "{{ kubernetes.pod_ip_range | ipsubnet(kubernetes.pod_ip_range_size, kubeguard.node_index[inventory_hostname]) }}" + } +} diff --git a/roles/kubernetes/net/kubeguard/node/templates/kubeguard-peer.service.j2 b/roles/kubernetes/net/kubeguard/node/templates/kubeguard-peer.service.j2 new file mode 100644 index 00000000..72b39c3f --- /dev/null +++ b/roles/kubernetes/net/kubeguard/node/templates/kubeguard-peer.service.j2 @@ -0,0 +1,37 @@ +[Unit] +Description=Kubernetes Network Peer {{ peer }} +After=network.target +Requires=kubeguard-interfaces.service +After=kubeguard-interfaces.service + +{% set pod_ip_self = kubernetes.pod_ip_range | ipsubnet(kubernetes.pod_ip_range_size, kubeguard.node_index[inventory_hostname]) | ipaddr(1) | ipaddr('address') -%} +{% set pod_net_peer = kubernetes.pod_ip_range | ipsubnet(kubernetes.pod_ip_range_size, kubeguard.node_index[peer]) -%} +{% set direct_zone = kubeguard.direct_net_zones | direct_net_zone(inventory_hostname, peer) -%} +{% if direct_zone %} +{% set direct_ip = kubeguard.direct_net_zones[direct_zone].transfer_net | ipaddr(kubeguard.node_index[inventory_hostname]) %} +{% set direct_interface = kubeguard.direct_net_zones[direct_zone].node_interface[inventory_hostname] %} +{% set direct_ip_peer = kubeguard.direct_net_zones[direct_zone].transfer_net | ipaddr(kubeguard.node_index[peer]) %} +{% else %} +{% set tun_ip = kubernetes.pod_ip_range | ipsubnet(kubernetes.pod_ip_range_size, 0) | ipaddr(kubeguard.node_index[peer]) -%} +{% set wg_pubkey = hostvars[peer].kubeguard_wireguard_pubkey.stdout -%} +{% set wg_host = hostvars[peer].external_ip_cooked | default(hostvars[peer].ansible_default_ipv4.address) -%} +{% set wg_port = hostvars[peer].kubeguard_wireguard_port -%} +{% set wg_allowedips = (tun_ip | ipaddr('address')) + "/32," + pod_net_peer %} +{% endif %} +[Service] +Type=oneshot +{% if direct_zone %} +ExecStart=/sbin/ip addr add {{ direct_ip }} dev {{ direct_interface }} +ExecStart=/sbin/ip link set up dev {{ direct_interface }} +ExecStart=/sbin/ip route add {{ pod_net_peer }} via {{ direct_ip_peer | ipaddr('address') }} src {{ pod_ip_self }} +ExecStop=/sbin/ip route del {{ pod_net_peer }} +ExecStop=/sbin/ip link set down dev {{ direct_interface }} +ExecStop=/sbin/ip addr del {{ direct_ip }} dev {{ direct_interface }} +{% else %} +ExecStart=/usr/bin/wg set kube-wg0 peer {{ wg_pubkey }} allowed-ips {{ wg_allowedips }} endpoint {{ wg_host }}:{{ wg_port }} persistent-keepalive 10 +ExecStop=/usr/bin/wg set kube-wg0 peer {{ wg_pubkey }} remove +{% endif %} +RemainAfterExit=yes + +[Install] +WantedBy=multi-user.target |