Feature/add flannel wireguard encryption backend as option (#9583)

* feat(): Add wireguard backend to flannel cni

As described in the flannel docs:
https://github.com/flannel-io/flannel/blob/master/Documentation/backends.md#wireguard

This does not support optional configuration methods like:
- setting a psk (will be autogenerated by default)
- chang listening ports
- change mode (defaults to 'separate')
- change PersistentKeepaliveInterval (defaults to 0)

* Add supported backends to flannel docs

* Fix markdown in docs
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janaurka 2022-12-19 00:39:43 +01:00 committed by GitHub
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3 changed files with 12 additions and 2 deletions

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@ -2,6 +2,8 @@
Flannel is a network fabric for containers, designed for Kubernetes Flannel is a network fabric for containers, designed for Kubernetes
Supported [backends](https://github.com/flannel-io/flannel/blob/master/Documentation/backends.md#wireguard): `vxlan`, `host-gw` and `wireguard`
**Warning:** You may encounter this [bug](https://github.com/coreos/flannel/pull/1282) with `VXLAN` backend, while waiting on a newer Flannel version the current workaround (`ethtool --offload flannel.1 rx off tx off`) is showcase in kubespray [networking test](tests/testcases/040_check-network-adv.yml:31). **Warning:** You may encounter this [bug](https://github.com/coreos/flannel/pull/1282) with `VXLAN` backend, while waiting on a newer Flannel version the current workaround (`ethtool --offload flannel.1 rx off tx off`) is showcase in kubespray [networking test](tests/testcases/040_check-network-adv.yml:31).
## Verifying flannel install ## Verifying flannel install

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@ -10,8 +10,7 @@
## single quote and escape backslashes ## single quote and escape backslashes
# flannel_interface_regexp: '10\\.0\\.[0-2]\\.\\d{1,3}' # flannel_interface_regexp: '10\\.0\\.[0-2]\\.\\d{1,3}'
# You can choose what type of flannel backend to use: 'vxlan' or 'host-gw' # You can choose what type of flannel backend to use: 'vxlan', 'host-gw' or 'wireguard'
# for experimental backend
# please refer to flannel's docs : https://github.com/coreos/flannel/blob/master/README.md # please refer to flannel's docs : https://github.com/coreos/flannel/blob/master/README.md
# flannel_backend_type: "vxlan" # flannel_backend_type: "vxlan"
# flannel_vxlan_vni: 1 # flannel_vxlan_vni: 1

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@ -1,4 +1,13 @@
--- ---
- name: Flannel | Stop if kernel version is too low for Flannel Wireguard encryption
assert:
that: ansible_kernel.split('-')[0] is version('5.6.0', '>=')
when:
- kube_network_plugin == 'flannel'
- flannel_backend_type == 'wireguard'
- not ignore_assert_errors
- name: Flannel | Create Flannel manifests - name: Flannel | Create Flannel manifests
template: template:
src: "{{ item.file }}.j2" src: "{{ item.file }}.j2"