Get Started with AWS

VPC (Virtual Private Cloud)

VPCs
- Subnets
  - public subnet
  - private subnet
- Accessing the Internet
  - private IP & public IP & EIP & route table
  - IGW (Internet Gateway)
  - NAT (network address translation)
- Security
  - Security Groups & EC2 Instances
    - **If you specify a single IPv4 address, specify the address using the /32 prefix length. If you specify a single IPv6 address, specify it using the /128 prefix length. **
    - Some systems for setting up firewalls let you filter on source ports. Security groups let you filter only on destination ports.
  - Network ACLs & Subnets

ELB (Elastic Load Balancing)

How Elastic Load Balancing Works
- With Application Load Balancers, cross-zone load balancing is always enabled.
- **With Network Load Balancers, cross-zone load balancing is disabled by default. After you create a Network Load Balancer, you can enable or disable cross-zone load balancing at any time. **

ELBs
- NLB (Network Load Balancer)
  - https://www.awsfeed.com/2019/08/09/using-a-network-load-balancer-with-the-nginx-ingress-controller-on-eks/

EC2 (Elastic Compute Cloud)

Install Docker

$ sudo amazon-linux-extras install docker -y

$ cat /etc/docker/daemon.json 
{
  "data-root": "/data/docker",
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}

$ sudo systemctl enable docker.service

$ sudo systemctl start docker.service

$ sudo docker info

$ sudo yum install amazon-ecr-credential-helper -y

$ sudo cat /root/.docker/config.json
{
  "credHelpers": {
    "[aws_account_id].dkr.ecr.[region].amazonaws.com.cn": "ecr-login"
  }
}

Install Kubernetes

Set bash completion

$ sudo sh -c "kubeadm completion bash > /etc/profile.d/kubeadm.sh"
$ source /etc/profile.d/kubeadm.sh

$ sudo sh -c "kubectl completion bash > /etc/profile.d/kubectl.sh"
$ source /etc/profile.d/kubectl.sh

Set kubelet root-dir

The file that can contain user-specified flag overrides with KUBELET_EXTRA_ARGS is sourced from /etc/default/kubelet (for DEBs), or /etc/sysconfig/kubelet (for RPMs). KUBELET_EXTRA_ARGS is last in the flag chain and has the highest priority in the event of conflicting settings
```
#KUBELET_EXTRA_ARGS=--root-dir=/opt/lib/kubelet
```

Enable kubelet service

$ sudo systemctl enable kubelet.service

kube init

$ sudo kubeadm init --pod-network-cidr=[10.244.0.0/16] --image-repository=[aws_account_id].dkr.ecr.[region].amazonaws.com.cn/k8s --kubernetes-version=[v1.15.0] [--ignore-preflight-errors=NumCPU]

Check required ports

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#check-required-ports

Nginx Ingress Controller & ALB & NLB

[23/Sep/2019:09:03:56 +0000] remote_addr=10.244.0.4 https= host=alb-449876832.cn-north-1.elb.amazonaws.com.cn request="GET /remote_addr?lb=alb HTTP/1.1" content_length=- request_id=11995321529ae2f4ba05f626d1b2bdce request_time=0.000 referer=- user_agent="curl/7.64.0" x_forwarded_for="10.0.2.71" status=404 bytes_sent=190 body_bytes_sent=21 upstream_addr=- upstream_status=- upstream_response_time=- upstream_connect_time=- upstream_header_time=-
[23/Sep/2019:09:05:06 +0000] remote_addr=10.244.0.4 https= host=nlb-49353abebcd88735.elb.cn-north-1.amazonaws.com.cn request="GET /remote_addr?lb=nlb HTTP/1.1" content_length=- request_id=6c3ea368830abef17296502d98e797f8 request_time=0.000 referer=- user_agent="curl/7.64.0" x_forwarded_for="140.206.187.194" status=404 bytes_sent=190 body_bytes_sent=21 upstream_addr=- upstream_status=- upstream_response_time=- upstream_connect_time=- upstream_header_time=-