-
Notifications
You must be signed in to change notification settings - Fork 1
/
main.tf
175 lines (149 loc) · 7.86 KB
/
main.tf
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
// Copyright 2022 Isovalent, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// List of availability zones for the chosen region.
data "aws_availability_zones" "available" {
state = "available"
}
// The VPC itself, as well as main subnets.
module "vpc" {
source = "terraform-aws-modules/vpc/aws"
version = "5.0.0"
azs = data.aws_availability_zones.available.names // Use all availability zones.
cidr = var.cidr // Use the CIDR specified as a variable.
enable_dns_hostnames = true // Enable DNS hostnames (required by EKS).
enable_nat_gateway = true // Enable NAT gateway to enable outbound internet traffic from instances in a private subnet.
name = var.name // Use the name specified as a variable.
one_nat_gateway_per_az = false // Use a single NAT gateway as that's the simplest and also all we need.
secondary_cidr_blocks = var.secondary_cidr_blocks // Define secondary CIDR blocks.
single_nat_gateway = true // Use a single NAT gateway as that's the simplest and also all we need.
tags = var.tags // Use the tags specified as a variable.
map_public_ip_on_launch = var.map_public_ip_on_launch // Map public IP on launch for instances in public subnets.
enable_ipv6 = var.enable_ipv6 // this will provide Amazon-provided IPv6 CIDR block which is a /56 block
public_subnet_assign_ipv6_address_on_creation = var.enable_ipv6 // this will help the EC2 to get the IPV6 address when it boots
private_subnet_assign_ipv6_address_on_creation = var.enable_ipv6 // this will help the EC2 to get the IPV6 address when it boots
// Create one private subnet per AZ (e.g. "10.1.0.0/24", "10.1.1.0/24", "10.1.2.0/24", ...).
// This could surely have been made differently (possibly even sourced from a variable), but it suffices for the time being.
private_subnets = [
for i, v in data.aws_availability_zones.available.names :
cidrsubnet(var.cidr, 8, i)
]
// Tag the private subnets adequately.
private_subnet_tags = merge(
var.additional_private_subnet_tags,
{
"eks-control-plane" = "true" // Mark the subnet as usable for setting up the EKS control-plane.
"kubernetes.io/role/internal-elb" = "1" // Required by AWS Load Balancer controller.
"type" = "private" // Required by AWS Load Balancer controller.
},
)
// Create one public subnet per AZ (e.g. "10.1.100.0/24", "10.1.101.0/24", "10.1.102.0/24", ...).
// This could surely have been made differently (possibly even sourced from a variable), but it suffices for the time being.
public_subnets = [
for i, v in data.aws_availability_zones.available.names :
cidrsubnet(var.cidr, 8, 100 + i)
]
// Tag the public subnets adequately.
public_subnet_tags = merge(
var.additional_public_subnet_tags,
{
"kubernetes.io/role/elb" = "1" // Required by AWS Load Balancer controller.
"type" = "public" // Required by AWS Load Balancer controller.
},
)
//This is needed when enabling the IPV6 but will not hurt when the IPV6 is not enabled.
private_subnet_ipv6_prefixes = [
for i, v in data.aws_availability_zones.available.names :
i
]
public_subnet_ipv6_prefixes = [
for i, v in data.aws_availability_zones.available.names :
10 + i
]
}
// Used to wait for the secondary CIDRs to be listed, as otherwise the AWS API will *sometimes* throw errors.
resource "null_resource" "wait_for_secondary_cidrs" {
provisioner "local-exec" {
command = "${path.module}/scripts/wait-for-secondary-cidrs.sh ${module.vpc.vpc_id} ${var.region} ${1 + length(var.secondary_cidr_blocks)}"
}
}
// Create the additional private subnets (if requested).
resource "aws_subnet" "additional_private_subnets" {
count = length(var.additional_private_subnets)
depends_on = [
null_resource.wait_for_secondary_cidrs,
]
availability_zone = var.additional_private_subnets[count.index].availability_zone
cidr_block = var.additional_private_subnets[count.index].cidr
tags = var.additional_private_subnets[count.index].tags
vpc_id = module.vpc.vpc_id
}
resource "aws_route_table_association" "additional_private_subnets" {
count = length(aws_subnet.additional_private_subnets)
subnet_id = aws_subnet.additional_private_subnets[count.index].id
route_table_id = module.vpc.private_route_table_ids[0]
}
// Create the additional public subnets (if requested).
resource "aws_subnet" "additional_public_subnets" {
count = length(var.additional_public_subnets) > 0 ? length(var.additional_public_subnets) : 0
depends_on = [
null_resource.wait_for_secondary_cidrs,
]
availability_zone = var.additional_public_subnets[count.index].availability_zone
cidr_block = var.additional_public_subnets[count.index].cidr
map_public_ip_on_launch = true
tags = var.additional_public_subnets[count.index].tags
vpc_id = module.vpc.vpc_id
}
resource "aws_route_table_association" "additional_public_subnets" {
count = length(aws_subnet.additional_public_subnets)
subnet_id = aws_subnet.additional_public_subnets[count.index].id
route_table_id = module.vpc.public_route_table_ids[0]
}
resource "tls_private_key" "bastion" {
count = var.bastion_host_enabled && var.bastion_host_ssh_public_key == "" ? 1 : 0
algorithm = "RSA"
rsa_bits = 4096
}
resource "local_file" "private_key" {
count = var.bastion_host_enabled && var.bastion_host_ssh_public_key == "" ? 1 : 0
content = tls_private_key.bastion[0].private_key_pem
filename = "${var.name}-private-key.pem"
file_permission = "0600"
}
resource "aws_key_pair" "bastion" {
count = var.bastion_host_enabled ? 1 : 0
key_name = local.bastion_host_key_pair_name
public_key = var.bastion_host_ssh_public_key != "" ? var.bastion_host_ssh_public_key : tls_private_key.bastion[0].public_key_openssh
}
module "bastion" {
count = var.bastion_host_enabled ? 1 : 0
source = "cloudposse/ec2-bastion-server/aws"
version = "0.31.0"
ami_filter = { name = [var.bastion_host_ami_name_filter] }
ami_owners = var.bastion_host_ami_owners
ami = var.bastion_host_ami_id
associate_public_ip_address = var.bastion_host_assign_public_ip
enabled = var.bastion_host_enabled
instance_type = var.bastion_host_instance_type
key_name = aws_key_pair.bastion[0].key_name
name = "${var.name}-bastion"
security_groups = var.bastion_host_extra_security_groups
security_group_rules = var.bastion_host_security_group_rules
ssm_enabled = true
subnets = var.bastion_host_assign_public_ip ? module.vpc.public_subnets : module.vpc.private_subnets
tags = var.tags
vpc_id = module.vpc.vpc_id
user_data = var.bastion_host_user_data
user_data_base64 = var.bastion_host_user_data_base64
}