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by Master Seo Apr 24. 2023

(온보딩 교육 2일차) 2. AWS 기초 2023

개발자는 네트워크를 어려워한다.  네트워크를 알려준다~



목표

AWS기본 네트워크 이해하기 - Public, Private , DB Subnet , NAT , ELB

AWS 기본 네트워크 구축하기 -Public, Private , DB Subnet , NAT , ELB 



<1> 디폴트 네트워크 만들기

<2> 사설에서 나가는것은  NAT Gateway사용한다

<3> 들어오는것은 ELB 사용한다.

<4> 서브네팅

<5> 네트워크 , 서버 만드는 방법?

<6> 후기



<1> 디폴트 네트워크 만들기


디폴트 네트워크 만들기

public subnet, private subnet 만들기

NAT만들기 

로드 밸런서 만들기

public subnet 2개

private subnet 2개

NAT 2개

ELB 1개




<2> 사설에서 나가는것은  NAT Gateway사용한다


NAT IP 2개를 협력업체에게 알려주어 방화벽 허용을 해야 한다.

확인해보자

<3> 들어오는것은 ELB 사용한다.


NLB는 기본적으로 고정 IP를 사용한다.

ALB는 NLB+ ALB구성으로 고정 IP를 사용할수 있다.



<4> 서브네팅







<5> 네트워크 , 서버 만드는 방법?


1)

디폴트 VPC 만들기


2)

AWS 위저드 사용  - 부족한 부분 클릭 클릭



3) 콘솔에서 수동으로 클릭 클릭

Your VPCs New

public subnet 2개

private subnet 2개

NAT 2개

ELB 1개



4)

Cloud Formation 사용 - AWS IAC 툴이다.    

또는 AWS CDK 사용.


pub2, pri2, ec2 1대


AWSTemplateFormatVersion: '2010-09-09'


Metadata:

  AWS::CloudFormation::Interface:

    ParameterGroups:

      - Label:

          default: "<<<<< EKSCTL MY EC2 >>>>>"

        Parameters:

          - ClusterBaseName

          - KeyName

          - SgIngressSshCidr

          - MyInstanceType

          - LatestAmiId

      - Label:

          default: "<<<<< Region AZ >>>>>"

        Parameters:

          - TargetRegion

          - AvailabilityZone1

          - AvailabilityZone2

      - Label:

          default: "<<<<< VPC Subnet >>>>>"

        Parameters:

          - VpcBlock

          - PublicSubnet1Block

          - PublicSubnet2Block

          - PrivateSubnet1Block

          - PrivateSubnet2Block


Parameters:

  ClusterBaseName:

    Type: String

    Default: myeks

    AllowedPattern: "[a-zA-Z][-a-zA-Z0-9]*"

    Description: must be a valid Allowed Pattern '[a-zA-Z][-a-zA-Z0-9]*'

    ConstraintDescription: ClusterBaseName - must be a valid Allowed Pattern


  KeyName:

    Description: Name of an existing EC2 KeyPair to enable SSH access to the instances. Linked to AWS Parameter

    Type: AWS::EC2::KeyPair::KeyName

    ConstraintDescription: must be the name of an existing EC2 KeyPair.


  SgIngressSshCidr:

    Description: The IP address range that can be used to communicate to the EC2 instances

    Type: String

    MinLength: '9'

    MaxLength: '18'

    Default: 0.0.0.0/0

    AllowedPattern: (\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/(\d{1,2})

    ConstraintDescription: must be a valid IP CIDR range of the form x.x.x.x/x.


  MyInstanceType:

    Description: Enter t2.micro, t2.small, t2.medium, t3.micro, t3.small, t3.medium. Default is t2.micro.

    Type: String

    Default: t3.medium

    AllowedValues: 

      - t2.micro

      - t2.small

      - t2.medium

      - t3.micro

      - t3.small

      - t3.medium


  LatestAmiId:

    Description: (DO NOT CHANGE)

    Type: 'AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>'

    Default: '/aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2'

    AllowedValues:

      - /aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2


  TargetRegion:

    Type: String

    Default: ap-northeast-2


  AvailabilityZone1:

    Type: String

    Default: ap-northeast-2a


  AvailabilityZone2:

    Type: String

    Default: ap-northeast-2c


  VpcBlock:

    Type: String

    Default: 192.168.0.0/16


  PublicSubnet1Block:

    Type: String

    Default: 192.168.1.0/24


  PublicSubnet2Block:

    Type: String

    Default: 192.168.2.0/24


  PrivateSubnet1Block:

    Type: String

    Default: 192.168.3.0/24


  PrivateSubnet2Block:

    Type: String

    Default: 192.168.4.0/24


Resources:

# VPC

  EksVPC:

    Type: AWS::EC2::VPC

    Properties:

      CidrBlock: !Ref VpcBlock

      EnableDnsSupport: true

      EnableDnsHostnames: true

      Tags:

        - Key: Name

          Value: !Sub ${ClusterBaseName}-VPC


# PublicSubnets

  PublicSubnet1:

    Type: AWS::EC2::Subnet

    Properties:

      AvailabilityZone: !Ref AvailabilityZone1

      CidrBlock: !Ref PublicSubnet1Block

      VpcId: !Ref EksVPC

      MapPublicIpOnLaunch: true

      Tags:

        - Key: Name

          Value: !Sub ${ClusterBaseName}-PublicSubnet1

        - Key: kubernetes.io/role/elb

          Value: 1


  PublicSubnet2:

    Type: AWS::EC2::Subnet

    Properties:

      AvailabilityZone: !Ref AvailabilityZone2

      CidrBlock: !Ref PublicSubnet2Block

      VpcId: !Ref EksVPC

      MapPublicIpOnLaunch: true

      Tags:

        - Key: Name

          Value: !Sub ${ClusterBaseName}-PublicSubnet2

        - Key: kubernetes.io/role/elb

          Value: 1


  InternetGateway:

    Type: AWS::EC2::InternetGateway


  VPCGatewayAttachment:

    Type: AWS::EC2::VPCGatewayAttachment

    Properties:

      InternetGatewayId: !Ref InternetGateway

      VpcId: !Ref EksVPC


  PublicSubnetRouteTable:

    Type: AWS::EC2::RouteTable

    Properties:

      VpcId: !Ref EksVPC

      Tags:

        - Key: Name

          Value: !Sub ${ClusterBaseName}-PublicSubnetRouteTable


  PublicSubnetRoute:

    Type: AWS::EC2::Route

    Properties:

      RouteTableId: !Ref PublicSubnetRouteTable

      DestinationCidrBlock: 0.0.0.0/0

      GatewayId: !Ref InternetGateway


  PublicSubnet1RouteTableAssociation:

    Type: AWS::EC2::SubnetRouteTableAssociation

    Properties:

      SubnetId: !Ref PublicSubnet1

      RouteTableId: !Ref PublicSubnetRouteTable


  PublicSubnet2RouteTableAssociation:

    Type: AWS::EC2::SubnetRouteTableAssociation

    Properties:

      SubnetId: !Ref PublicSubnet2

      RouteTableId: !Ref PublicSubnetRouteTable


# PrivateSubnets

  PrivateSubnet1:

    Type: AWS::EC2::Subnet

    Properties:

      AvailabilityZone: !Ref AvailabilityZone1

      CidrBlock: !Ref PrivateSubnet1Block

      VpcId: !Ref EksVPC

      Tags:

        - Key: Name

          Value: !Sub ${ClusterBaseName}-PrivateSubnet1

        - Key: kubernetes.io/role/internal-elb

          Value: 1


  PrivateSubnet2:

    Type: AWS::EC2::Subnet

    Properties:

      AvailabilityZone: !Ref AvailabilityZone2

      CidrBlock: !Ref PrivateSubnet2Block

      VpcId: !Ref EksVPC

      Tags:

        - Key: Name

          Value: !Sub ${ClusterBaseName}-PrivateSubnet2

        - Key: kubernetes.io/role/internal-elb

          Value: 1


  PrivateSubnetRouteTable:

    Type: AWS::EC2::RouteTable

    Properties:

      VpcId: !Ref EksVPC

      Tags:

        - Key: Name

          Value: !Sub ${ClusterBaseName}-PrivateSubnetRouteTable


  PrivateSubnet1RouteTableAssociation:

    Type: AWS::EC2::SubnetRouteTableAssociation

    Properties:

      SubnetId: !Ref PrivateSubnet1

      RouteTableId: !Ref PrivateSubnetRouteTable


  PrivateSubnet2RouteTableAssociation:

    Type: AWS::EC2::SubnetRouteTableAssociation

    Properties:

      SubnetId: !Ref PrivateSubnet2

      RouteTableId: !Ref PrivateSubnetRouteTable


# EKSCTL-Host

  EKSEC2SG:

    Type: AWS::EC2::SecurityGroup

    Properties:

      GroupDescription: eksctl-host Security Group

      VpcId: !Ref EksVPC

      Tags:

        - Key: Name

          Value: !Sub ${ClusterBaseName}-HOST-SG

      SecurityGroupIngress:

      - IpProtocol: '-1'

        #FromPort: '22'

        #ToPort: '22'

        CidrIp: !Ref SgIngressSshCidr


  EKSEC2:

    Type: AWS::EC2::Instance

    Properties:

      InstanceType: !Ref MyInstanceType

      ImageId: !Ref LatestAmiId

      KeyName: !Ref KeyName

      Tags:

        - Key: Name

          Value: !Sub ${ClusterBaseName}-host

      NetworkInterfaces:

        - DeviceIndex: 0

          SubnetId: !Ref PublicSubnet1

          GroupSet:

          - !Ref EKSEC2SG

          AssociatePublicIpAddress: true

          PrivateIpAddress: 192.168.1.100

      BlockDeviceMappings:

        - DeviceName: /dev/xvda

          Ebs:

            VolumeType: gp3

            VolumeSize: 20

            DeleteOnTermination: true

      UserData:

        Fn::Base64:

          !Sub |

            #!/bin/bash

            hostnamectl --static set-hostname "${ClusterBaseName}-host"


            # Config convenience

            echo 'alias vi=vim' >> /etc/profile

            echo "sudo su -" >> /home/ec2-user/.bashrc


            # Change Timezone

            sed -i "s/UTC/Asia\/Seoul/g" /etc/sysconfig/clock

            ln -sf /usr/share/zoneinfo/Asia/Seoul /etc/localtime


            # Install Packages

            cd /root

            yum -y install tree jq git htop lynx


            # Install kubectl & helm

            #curl -O https://s3.us-west-2.amazonaws.com/amazon-eks/1.26.2/2023-03-17/bin/linux/amd64/kubectl

            curl -O https://s3.us-west-2.amazonaws.com/amazon-eks/1.25.7/2023-03-17/bin/linux/amd64/kubectl

            install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl

            curl -s https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash


            # Install eksctl

            curl --silent --location "https://github.com/weaveworks/eksctl/releases/latest/download/eksctl_$(uname -s)_amd64.tar.gz" | tar xz -C /tmp

            mv /tmp/eksctl /usr/local/bin


            # Install aws cli v2

            curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"

            unzip awscliv2.zip >/dev/null 2>&1

            sudo ./aws/install

            complete -C '/usr/local/bin/aws_completer' aws

            echo 'export AWS_PAGER=""' >>/etc/profile

            export AWS_DEFAULT_REGION=${AWS::Region}

            echo "export AWS_DEFAULT_REGION=$AWS_DEFAULT_REGION" >> /etc/profile


            # Install YAML Highlighter

            wget https://github.com/andreazorzetto/yh/releases/download/v0.4.0/yh-linux-amd64.zip

            unzip yh-linux-amd64.zip

            mv yh /usr/local/bin/


            # Install krew

            curl -LO https://github.com/kubernetes-sigs/krew/releases/download/v0.4.3/krew-linux_amd64.tar.gz

            tar zxvf krew-linux_amd64.tar.gz

            ./krew-linux_amd64 install krew

            export PATH="$PATH:/root/.krew/bin"

            echo 'export PATH="$PATH:/root/.krew/bin"' >> /etc/profile


            # Install kube-ps1

            echo 'source <(kubectl completion bash)' >> /etc/profile

            echo 'alias k=kubectl' >> /etc/profile

            echo 'complete -F __start_kubectl k' >> /etc/profile


            git clone https://github.com/jonmosco/kube-ps1.git /root/kube-ps1

            cat <<"EOT" >> /root/.bash_profile

            source /root/kube-ps1/kube-ps1.sh

            KUBE_PS1_SYMBOL_ENABLE=false

            function get_cluster_short() {

              echo "$1" | cut -d . -f1

            }

            KUBE_PS1_CLUSTER_FUNCTION=get_cluster_short

            KUBE_PS1_SUFFIX=') '

            PS1='$(kube_ps1)'$PS1

            EOT


            # Install krew plugin

            kubectl krew install ctx ns get-all  # ktop df-pv mtail tree


            # Install Docker

            amazon-linux-extras install docker -y

            systemctl start docker && systemctl enable docker


            # CLUSTER_NAME

            export CLUSTER_NAME=${ClusterBaseName}

            echo "export CLUSTER_NAME=$CLUSTER_NAME" >> /etc/profile


            # Create SSH Keypair

            ssh-keygen -t rsa -N "" -f /root/.ssh/id_rsa


Outputs:

  eksctlhost:

    Value: !GetAtt EKSEC2.PublicIp




5)

테라폼 등 사용 

- AWS나 Google , Azure등 다양한 CSP 서비스에서 사용 가능하다.


https://brunch.co.kr/@topasvga/2752




<6> 후기


1

2/3 인원은  AWS를 기본적으로 다루어 봤다.


2

네트워크에 대해서는 잘 모른다. EIP와 서버 1대 만드는건 안다.

그러나, NAT, ELB는 잘 모른다.


3

"동영상 녹화자료를 봐야 따라할수 있을거 같다"  가 대부분이다.

앞으로 Zoom 녹화자료를 제공해야 겠다.



타이머

https://vclock.kr/timer/#countdown=00:10:00&enabled=0&seconds=0&sound=xylophone&loop=1



감사합니다.

매거진의 이전글 (온보딩 교육 1일차) 1.AWS 기초 2023
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