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Harden internal firewall rules on DigitalOcean

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* Define firewall rules on DigitialOcean to match rules used on AWS,
GCP, and Azure
* Output `controller_tag` and `worker_tag` to simplify custom firewall
rule creation
This commit is contained in:
Dalton Hubble
2019-04-02 23:02:04 -07:00
parent 60265f9b58
commit 2a07c97538
3 changed files with 77 additions and 18 deletions
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77
digital-ocean/container-linux/kubernetes/network.tf
View File

@ -3,36 +3,26 @@ resource "digitalocean_firewall" "rules" {
tags = ["${var.cluster_name}-controller", "${var.cluster_name}-worker"]
# allow ssh, apiserver, http/https ingress, and peer-to-peer traffic
# allow ssh, internal flannel, internal node-exporter, internal kubelet
inbound_rule = [
{
protocol = "tcp"
port_range = "22"
source_addresses = ["0.0.0.0/0", "::/0"]
},
{
protocol = "tcp"
port_range = "80"
source_addresses = ["0.0.0.0/0", "::/0"]
},
{
protocol = "tcp"
port_range = "443"
source_addresses = ["0.0.0.0/0", "::/0"]
},
{
protocol = "tcp"
port_range = "6443"
source_addresses = ["0.0.0.0/0", "::/0"]
},
{
protocol = "udp"
port_range = "1-65535"
port_range = "8472"
source_tags = ["${digitalocean_tag.controllers.name}", "${digitalocean_tag.workers.name}"]
},
{
protocol = "tcp"
port_range = "1-65535"
port_range = "9100"
source_tags = ["${digitalocean_tag.workers.name}"]
},
{
protocol = "tcp"
port_range = "10250"
source_tags = ["${digitalocean_tag.controllers.name}", "${digitalocean_tag.workers.name}"]
},
]
@ -56,3 +46,54 @@ resource "digitalocean_firewall" "rules" {
},
]
}
resource "digitalocean_firewall" "controllers" {
name = "${var.cluster_name}-controllers"
tags = ["${var.cluster_name}-controller"]
# etcd, kube-apiserver, kubelet
inbound_rule = [
{
protocol = "tcp"
port_range = "2379-2380"
source_tags = ["${digitalocean_tag.controllers.name}"]
},
{
protocol = "tcp"
port_range = "2381"
source_tags = ["${digitalocean_tag.workers.name}"]
},
{
protocol = "tcp"
port_range = "6443"
source_addresses = ["0.0.0.0/0", "::/0"]
},
]
}
resource "digitalocean_firewall" "workers" {
name = "${var.cluster_name}-workers"
tags = ["${var.cluster_name}-worker"]
# allow HTTP/HTTPS ingress
inbound_rule = [
{
protocol = "tcp"
port_range = "80"
source_addresses = ["0.0.0.0/0", "::/0"]
},
{
protocol = "tcp"
port_range = "443"
source_addresses = ["0.0.0.0/0", "::/0"]
},
{
protocol = "tcp"
port_range = "10254"
source_addresses = ["0.0.0.0/0"]
},
]
}

13
digital-ocean/container-linux/kubernetes/outputs.tf
View File

@ -26,3 +26,16 @@ output "workers_ipv4" {
output "workers_ipv6" {
value = ["${digitalocean_droplet.workers.*.ipv6_address}"]
}
# Outputs for custom firewalls
output "controller_tag" {
description = "Tag applied to controller droplets"
value = "${digitalocean_tag.controllers.name}"
}
output "worker_tag" {
description = "Tag applied to worker droplets"
value = "${digitalocean_tag.workers.name}"
}