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Add experimental Cilium CNI provider

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* Accept experimental CNI `networking` mode "cilium"
* Run Cilium v1.8.0-rc4 with overlay vxlan tunnels and a
minimal set of features. We're interested in:
  * IPAM: Divide pod_cidr into /24 subnets per node
  * CNI networking pod-to-pod, pod-to-external
  * BPF masquerade
  * NetworkPolicy as defined by Kubernetes (no L7 Policy)
* Continue using kube-proxy with Cilium probe mode
* Firewall changes:
  * Require UDP 8472 for vxlan (Linux kernel default) between nodes
  * Optional ICMP echo(8) between nodes for host reachability
    (health)
  * Optional TCP 4240 between nodes for endpoint reachability (health)

Known Issues:

* Containers with `hostPort` don't listen on all host addresses,
these workloads must use `hostNetwork` for now
https://github.com/cilium/cilium/issues/12116
* Erroneous warning on Fedora CoreOS
https://github.com/cilium/cilium/issues/10256

Note: This is experimental. It is not listed in docs and may be
changed or removed without a deprecation notice

Related:

* https://github.com/poseidon/terraform-render-bootstrap/pull/192
* https://github.com/cilium/cilium/issues/12217
This commit is contained in:
Dalton Hubble
2020-06-15 22:42:57 -07:00
parent 37f00a3882
commit e9c8520359
28 changed files with 678 additions and 54 deletions
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2
digital-ocean/container-linux/kubernetes/bootstrap.tf
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@ -1,6 +1,6 @@
# Kubernetes assets (kubeconfig, manifests)
module "bootstrap" {
source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=e75697ce35d7773705f0b9b28ce1ffbe99f9493c"
source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=af36c539360696f5ca6cf5b06bb729477a003602"
cluster_name = var.cluster_name
api_servers = [format("%s.%s", var.cluster_name, var.dns_zone)]

21
digital-ocean/container-linux/kubernetes/network.tf
View File

@ -6,6 +6,11 @@ resource "digitalocean_firewall" "rules" {
digitalocean_tag.workers.name
]
inbound_rule {
protocol = "icmp"
source_tags = [digitalocean_tag.controllers.name, digitalocean_tag.workers.name]
}
# allow ssh, internal flannel, internal node-exporter, internal kubelet
inbound_rule {
protocol = "tcp"
@ -13,12 +18,27 @@ resource "digitalocean_firewall" "rules" {
source_addresses = ["0.0.0.0/0", "::/0"]
}
# Cilium health
inbound_rule {
protocol = "tcp"
port_range = "4240"
source_tags = [digitalocean_tag.controllers.name, digitalocean_tag.workers.name]
}
# IANA vxlan (flannel, calico)
inbound_rule {
protocol = "udp"
port_range = "4789"
source_tags = [digitalocean_tag.controllers.name, digitalocean_tag.workers.name]
}
# Linux vxlan (Cilium)
inbound_rule {
protocol = "udp"
port_range = "8472"
source_tags = [digitalocean_tag.controllers.name, digitalocean_tag.workers.name]
}
# Allow Prometheus to scrape node-exporter
inbound_rule {
protocol = "tcp"
@ -33,6 +53,7 @@ resource "digitalocean_firewall" "rules" {
source_tags = [digitalocean_tag.workers.name]
}
# Kubelet
inbound_rule {
protocol = "tcp"
port_range = "10250"