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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
Download Patch File Download Diff File Expand all files Collapse all files

2
azure/container-linux/kubernetes/bootstrap.tf
View File

@ -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)]

92
azure/container-linux/kubernetes/security.tf
View File

@ -7,6 +7,21 @@ resource "azurerm_network_security_group" "controller" {
location = azurerm_resource_group.cluster.location
}
resource "azurerm_network_security_rule" "controller-icmp" {
resource_group_name = azurerm_resource_group.cluster.name
name = "allow-icmp"
network_security_group_name = azurerm_network_security_group.controller.name
priority = "1995"
access = "Allow"
direction = "Inbound"
protocol = "Icmp"
source_port_range = "*"
destination_port_range = "*"
source_address_prefixes = [azurerm_subnet.controller.address_prefix, azurerm_subnet.worker.address_prefix]
destination_address_prefix = azurerm_subnet.controller.address_prefix
}
resource "azurerm_network_security_rule" "controller-ssh" {
resource_group_name = azurerm_resource_group.cluster.name
@ -100,6 +115,22 @@ resource "azurerm_network_security_rule" "controller-apiserver" {
destination_address_prefix = azurerm_subnet.controller.address_prefix
}
resource "azurerm_network_security_rule" "controller-cilium-health" {
resource_group_name = azurerm_resource_group.cluster.name
count = var.networking == "cilium" ? 1 : 0
name = "allow-cilium-health"
network_security_group_name = azurerm_network_security_group.controller.name
priority = "2019"
access = "Allow"
direction = "Inbound"
protocol = "Tcp"
source_port_range = "*"
destination_port_range = "4240"
source_address_prefixes = [azurerm_subnet.controller.address_prefix, azurerm_subnet.worker.address_prefix]
destination_address_prefix = azurerm_subnet.controller.address_prefix
}
resource "azurerm_network_security_rule" "controller-vxlan" {
resource_group_name = azurerm_resource_group.cluster.name
@ -115,6 +146,21 @@ resource "azurerm_network_security_rule" "controller-vxlan" {
destination_address_prefix = azurerm_subnet.controller.address_prefix
}
resource "azurerm_network_security_rule" "controller-linux-vxlan" {
resource_group_name = azurerm_resource_group.cluster.name
name = "allow-linux-vxlan"
network_security_group_name = azurerm_network_security_group.controller.name
priority = "2021"
access = "Allow"
direction = "Inbound"
protocol = "Udp"
source_port_range = "*"
destination_port_range = "8472"
source_address_prefixes = [azurerm_subnet.controller.address_prefix, azurerm_subnet.worker.address_prefix]
destination_address_prefix = azurerm_subnet.controller.address_prefix
}
# Allow Prometheus to scrape node-exporter daemonset
resource "azurerm_network_security_rule" "controller-node-exporter" {
resource_group_name = azurerm_resource_group.cluster.name
@ -191,6 +237,21 @@ resource "azurerm_network_security_group" "worker" {
location = azurerm_resource_group.cluster.location
}
resource "azurerm_network_security_rule" "worker-icmp" {
resource_group_name = azurerm_resource_group.cluster.name
name = "allow-icmp"
network_security_group_name = azurerm_network_security_group.worker.name
priority = "1995"
access = "Allow"
direction = "Inbound"
protocol = "Icmp"
source_port_range = "*"
destination_port_range = "*"
source_address_prefixes = [azurerm_subnet.controller.address_prefix, azurerm_subnet.worker.address_prefix]
destination_address_prefix = azurerm_subnet.worker.address_prefix
}
resource "azurerm_network_security_rule" "worker-ssh" {
resource_group_name = azurerm_resource_group.cluster.name
@ -236,6 +297,22 @@ resource "azurerm_network_security_rule" "worker-https" {
destination_address_prefix = azurerm_subnet.worker.address_prefix
}
resource "azurerm_network_security_rule" "worker-cilium-health" {
resource_group_name = azurerm_resource_group.cluster.name
count = var.networking == "cilium" ? 1 : 0
name = "allow-cilium-health"
network_security_group_name = azurerm_network_security_group.worker.name
priority = "2014"
access = "Allow"
direction = "Inbound"
protocol = "Tcp"
source_port_range = "*"
destination_port_range = "4240"
source_address_prefixes = [azurerm_subnet.controller.address_prefix, azurerm_subnet.worker.address_prefix]
destination_address_prefix = azurerm_subnet.worker.address_prefix
}
resource "azurerm_network_security_rule" "worker-vxlan" {
resource_group_name = azurerm_resource_group.cluster.name
@ -251,6 +328,21 @@ resource "azurerm_network_security_rule" "worker-vxlan" {
destination_address_prefix = azurerm_subnet.worker.address_prefix
}
resource "azurerm_network_security_rule" "worker-linux-vxlan" {
resource_group_name = azurerm_resource_group.cluster.name
name = "allow-linux-vxlan"
network_security_group_name = azurerm_network_security_group.worker.name
priority = "2016"
access = "Allow"
direction = "Inbound"
protocol = "Udp"
source_port_range = "*"
destination_port_range = "8472"
source_address_prefixes = [azurerm_subnet.controller.address_prefix, azurerm_subnet.worker.address_prefix]
destination_address_prefix = azurerm_subnet.worker.address_prefix
}
# Allow Prometheus to scrape node-exporter daemonset
resource "azurerm_network_security_rule" "worker-node-exporter" {
resource_group_name = azurerm_resource_group.cluster.name