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Provision loadbalancer with terraform and custom scripts

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This commit is contained in:
Paul-Henri Froidmont 2019-08-17 23:58:36 +02:00
parent 01b7e79e55
commit 77a6ef36f3
8 changed files with 136 additions and 29 deletions
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19
terraform/config.tf Normal file
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@ -0,0 +1,19 @@
locals {
environment = terraform.workspace != "" ? terraform.workspace : "test"
}
terraform {
backend "s3" {
bucket = "banditlair-k8s-tfstate"
key = "banditlair.tfstate"
region = "nl-ams"
endpoint = "https://s3.nl-ams.scw.cloud"
profile = "default"
skip_credentials_validation = true
skip_region_validation = true
}
}
provider "scaleway" {
region = var.region
}

29
terraform/main.tf → terraform/instances.tf
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@ -1,23 +1,3 @@
locals {
environment = terraform.workspace != "" ? terraform.workspace : "test"
}
terraform {
backend "s3" {
bucket = "banditlair-k8s-tfstate"
key = "banditlair.tfstate"
region = "nl-ams"
endpoint = "https://s3.nl-ams.scw.cloud"
profile = "default"
skip_credentials_validation = true
skip_region_validation = true
}
}
provider "scaleway" {
region = var.region
}
data "scaleway_image" "ubuntu" {
architecture = var.architecture
name = var.image
@ -45,12 +25,3 @@ resource "scaleway_server" "master" {
"${local.environment}-etcd",
]
}
output "node_private_ips" {
value = [scaleway_server.node.*.private_ip]
}
output "master_private_ips" {
value = [scaleway_server.master.*.private_ip]
}

22
terraform/lb.tf Normal file
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@ -0,0 +1,22 @@
resource "null_resource" "load_balancer" {
provisioner "local-exec" {
command = "./scripts/create_lb.sh lb-k8s-${local.environment} ${var.lb_ip}"
}
provisioner "local-exec" {
when = "destroy"
command = "./scripts/delete_lb.sh ${var.lb_ip}"
}
}
resource "null_resource" "update_load_balancer_rules" {
triggers = {
node_instance_ids = "${join(",", scaleway_server.node.*.private_ip)}"
}
provisioner "local-exec" {
command = "./scripts/update_lb_rules.sh ${var.lb_ip} '${jsonencode(scaleway_server.node.*.private_ip)}'"
}
depends_on = [null_resource.load_balancer]
}

11
terraform/outputs.tf Normal file
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@ -0,0 +1,11 @@
output "loadbalancer_ip" {
value = var.lb_ip
}
output "node_public_ips" {
value = [scaleway_server.node.*.public_ip]
}
output "master_public_ips" {
value = [scaleway_server.master.*.public_ip]
}

16
terraform/scripts/create_lb.sh Executable file
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@ -0,0 +1,16 @@
#!/bin/bash
set -e
set -x
export TOKEN=`jq '.token' -r ~/.scwrc`
REGION="fr-par"
ORGANIZATION_ID=`jq '.organization' -r ~/.scwrc`
LB_NAME=$1
LB_IP=$2
IP_ID=$(http GET "https://api.scaleway.com/lb/v1/regions/$REGION/ips" X-Auth-Token:$TOKEN | jq -r ".ips[] | select(.ip_address == \"$LB_IP\") | .id")
echo "IP_ID: $IP_ID"
http POST "https://api.scaleway.com/lb/v1/regions/$REGION/lbs" X-Auth-Token:$TOKEN name=$LB_NAME organization_id=$ORGANIZATION_ID ip_id=$IP_ID --ignore-stdin | jq -r '.id'

17
terraform/scripts/delete_lb.sh Executable file
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@ -0,0 +1,17 @@
#!/bin/bash
set -e
set -x
export TOKEN=`jq '.token' -r ~/.scwrc`
REGION="fr-par"
ORGANIZATION_ID=`jq '.organization' -r ~/.scwrc`
LB_IP=$1
IP_ID=$(http GET "https://api.scaleway.com/lb/v1/regions/$REGION/ips" X-Auth-Token:$TOKEN | jq -r ".ips[] | select(.ip_address == \"$LB_IP\") | .id")
echo "IP_ID: $IP_ID"
LB_ID=$(http GET "https://api.scaleway.com/lb/v1/regions/$REGION/lbs" X-Auth-Token:$TOKEN | jq -r ".lbs[] | select(.ip[0].id == \"$IP_ID\") | .id")
http DELETE "https://api.scaleway.com/lb/v1/regions/$REGION/lbs/$LB_ID" X-Auth-Token:$TOKEN

48
terraform/scripts/update_lb_rules.sh Executable file
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@ -0,0 +1,48 @@
#!/bin/bash
set -e
set -x
export TOKEN=`jq '.token' -r ~/.scwrc`
REGION="fr-par"
ORGANIZATION_ID=`jq '.organization' -r ~/.scwrc`
LB_IP=$1
LB_TARGET_IPS=$2
function create_rules() {
LB_ID=$1
declare -A RULES
RULES[http]=80
RULES[https]=443
for PROTOCOL in "${!RULES[@]}"; do
PORT=${RULES[$PROTOCOL]}
BACKEND_ID=$(http POST "https://api.scaleway.com/lb/v1/regions/$REGION/lbs/$LB_ID/backends" X-Auth-Token:$TOKEN name=lbb-$PROTOCOL forward_protocol=tcp forward_port=$PORT forward_port_algorithm=roundrobin sticky_sessions=none health_check:="{\"http_config\":{\"uri\":\"/\",\"method\":\"GET\",\"code\":404},\"check_delay\":1001,\"check_max_retries\":3,\"check_timeout\":3000,\"port\":$PORT}" server_ip:=$LB_TARGET_IPS --ignore-stdin | jq -r '.id')
http POST "https://api.scaleway.com/lb/v1/regions/$REGION/lbs/$LB_ID/frontends" X-Auth-Token:$TOKEN backend_id=$BACKEND_ID inbound_port=$PORT name=lbf-$PROTOCOL --ignore-stdin
done
}
function update_rules() {
LB_ID=$1
BACKENDS_IDS$2
for BACKEND_ID in $BACKENDS_IDS
do
http PUT "https://api.scaleway.com/lb/v1/regions/$REGION/backends/$BACKEND_ID/servers" X-Auth-Token:$TOKEN server_ip:="$LB_TARGET_IPS" --ignore-stdin
done
}
IP_ID=$(http GET "https://api.scaleway.com/lb/v1/regions/$REGION/ips" X-Auth-Token:$TOKEN | jq -r ".ips[] | select(.ip_address == \"$LB_IP\") | .id")
echo "IP_ID: $IP_ID"
LB_ID=$(http GET "https://api.scaleway.com/lb/v1/regions/$REGION/lbs" X-Auth-Token:$TOKEN | jq -r ".lbs[] | select(.ip[0].id == \"$IP_ID\") | .id")
BACKENDS_IDS=$(http GET "https://api.scaleway.com/lb/v1/regions/$REGION/lbs/$LB_ID/backends" X-Auth-Token:$TOKEN | jq -r ".backends[] | .id")
if [ -n "$BACKENDS_IDS" ]
then
update_rules $LB_ID $BACKENDS_IDS
else
create_rules $LB_ID
fi

3
terraform/variables.tf
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@ -26,3 +26,6 @@ variable "node_instance_count" {
default = 2
}
variable "lb_ip" {
default = "51.159.26.139"
}