---
title: "Security groups creation"
date: 2020-11-26T15:59:47-05:00
draft: false
weight: 10
tags:
  - beginner
---

### Create and configure the security groups

First, let's create the RDS security group (RDS_SG). It will be used by the Amazon RDS instance to control network access.

```bash
export VPC_ID=$(aws eks describe-cluster \
    --name eksworkshop-eksctl \
    --query "cluster.resourcesVpcConfig.vpcId" \
    --output text)

# create RDS security group
aws ec2 create-security-group \
    --description 'RDS SG' \
    --group-name 'RDS_SG' \
    --vpc-id ${VPC_ID}

# save the security group ID for future use
export RDS_SG=$(aws ec2 describe-security-groups \
    --filters Name=group-name,Values=RDS_SG Name=vpc-id,Values=${VPC_ID} \
    --query "SecurityGroups[0].GroupId" --output text)

echo "RDS security group ID: ${RDS_SG}"
```

Now, let's create the pod security group (POD_SG).

```bash
# create the POD security group
aws ec2 create-security-group \
    --description 'POD SG' \
    --group-name 'POD_SG' \
    --vpc-id ${VPC_ID}

# save the security group ID for future use
export POD_SG=$(aws ec2 describe-security-groups \
    --filters Name=group-name,Values=POD_SG Name=vpc-id,Values=${VPC_ID} \
    --query "SecurityGroups[0].GroupId" --output text)

echo "POD security group ID: ${POD_SG}"
```

The pod needs to communicate with its node for DNS resolution, so we will update the Node Group security group accordingly.

```bash
export NODE_GROUP_SG=$(aws ec2 describe-security-groups \
    --filters Name=tag:Name,Values=eks-cluster-sg-eksworkshop-eksctl-* Name=vpc-id,Values=${VPC_ID} \
    --query "SecurityGroups[0].GroupId" \
    --output text)
echo "Node Group security group ID: ${NODE_GROUP_SG}"

# allow POD_SG to connect to NODE_GROUP_SG using TCP 53
aws ec2 authorize-security-group-ingress \
    --group-id ${NODE_GROUP_SG} \
    --protocol tcp \
    --port 53 \
    --source-group ${POD_SG}

# allow POD_SG to connect to NODE_GROUP_SG using UDP 53
aws ec2 authorize-security-group-ingress \
    --group-id ${NODE_GROUP_SG} \
    --protocol udp \
    --port 53 \
    --source-group ${POD_SG}
```

Finally, we will add two inbound traffic (ingress) [rules](https://docs.aws.amazon.com/vpc/latest/userguide/VPC_SecurityGroups.html#SecurityGroupRules) to the RDS_SG security group:

* One for Cloud9 (to populate the database).
* One to allow POD_SG security group to connect to the database.

```bash
# Cloud9 IP
export C9_IP=$(curl -s http://169.254.169.254/latest/meta-data/public-ipv4)

# allow Cloud9 to connect to RDS
aws ec2 authorize-security-group-ingress \
    --group-id ${RDS_SG} \
    --protocol tcp \
    --port 5432 \
    --cidr ${C9_IP}/32

# Allow POD_SG to connect to the RDS
aws ec2 authorize-security-group-ingress \
    --group-id ${RDS_SG} \
    --protocol tcp \
    --port 5432 \
    --source-group ${POD_SG}
```