AWS - Article 01 (Introduction to AWS and AWS EC2 instances and simple and practical)

1 Introduction
2. Create an AWS account
3. EC2
3. Some configuration files
4. About AMI
5. Attention
- 5.1 About amazon-linux-extras

1 Introduction

What is AWS?

Okay, I'll just take this many screenshots, and search for more by yourself...

2. Create an AWS account

The official website address is as follows:
https://aws.amazon.com/cn/ .
When registering, if you have a Google mailbox, it is best to use Google mailbox, as follows:
After successfully registering according to the prompts, you can log in to use it.
Just click around and seem to see something.

Continue...

3. EC2

3.1 Start a new EC2 instance

3.1.1 Entrance

as follows:

3.1.2 Set Name + Select Service

as follows:

3.1.3 Create key pair

as follows:
Click Create Key Pair to download it directly to your computer, and select the newly created key pair by default.

3.1.4 Network Settings - Security Group

3.1.4.1 Initial setup

as follows:

3.1.4.2 Add security group rules (open new ports)

[Edit Inbound Rules]–>[Add Rule]–>[Save Rule], as follows:

3.1.5 Configuration storage

Insert image description here

3.1.6 Start an instance

as follows:

3.1.7 View instances

as follows:

3.2 Connect to EC2 instance

3.2.1 Method 1——Instance Connect

as follows:

3.2.2 Method 2 - SSH client

Just follow the prompts, as follows:
Mac computers should be able to connect using the terminal that comes with them, but there is no response after I command here. It seems that I can’t connect to the Internet. I have always had this problem when using ClashX locally, and it doesn’t work if I exit. But at least I can connect to the Internet without exiting ClashX. , what’s going on with this terminal, I don’t know why, forget it, let’s talk about this later.
Therefore, instead of SecureCRTconnecting, copy the key to another remote server, execute the installation steps, and you can connect, as follows:
```
# 连接命令
ssh -i "自己的密钥文件" ec2-user@公有IPv4DNS    # ec2-user 默认用户
```

3.3 Simple and practical

3.3.1 Simple commands

To view the version, use the following command to view the version of Amazon Linux
```
cat /etc/system-release
```
Switch to root user
```
sudo -s
或
sudo su
```
Update software
```
yum update -y
```

3.3.2 Install application

3.3.2.1 Install git

Install git as follows:
```
yum install git -y

git --version
```

3.3.2.2 Install jdk

Simply use the command to install it, as follows:

yum install java-17-amazon-corretto-devel.x86_64

3.3.2.3 Install tomcat

Download tomcat as follows:

Go to the official website first:
Official website address: https://tomcat.apache.org/download-10.cgi .

Copy download link

https://dlcdn.apache.org/tomcat/tomcat-10/v10.1.11/bin/apache-tomcat-10.1.11.tar.gz

Then, download with the command

wget https://dlcdn.apache.org/tomcat/tomcat-10/v10.1.11/bin/apache-tomcat-10.1.11.tar.gz

Unzip and install tomcat as follows:
```
tar -zxvf apache-tomcat-10.1.11.tar.gz
```
Start as follows:
```
./startup.sh
```

Check operation status

ps -ef | grep java

lsof -i:8080

netstat -na | grep 8080

Browser access
- Before accessing, remember to open the port. For details, refer to: "3.1.4.2 Add security group rules (open new ports)》
```
http://公网IP:8080

或者

http://公有 IPv4 DNS:8080
```

3. Some configuration files

Configure user information, etc.
```
cat /etc/cloud/cloud.cfg
```

4. About AMI

When viewing instance information, you can see the AMI, as follows
So try to launch the instance from the AMI as follows:

5. Attention

5.1 About amazon-linux-extras

What is amazon-linux-extras?
- Amazon Linux Extras is a component of the Amazon Linux 2 distribution that allows users to install and manage additional software packages and services. Amazon Linux Extras allow users to easily obtain and install a variety of software packages that may not be included in the standard Amazon Linux 2 repositories.
- Namely: Amazon Linux Extras provide an easy way to extend the functionality of Amazon Linux 2.
Depending on the version you are using, check whether this command is available, as follows
- Check the Amazon Linux version as follows:
```
cat /etc/system-release
```
View installable software
```
amazon-linux-extras -v
```
Use amazon-linux-extrasthe command to install nginx, as follows:
- Install
```
sudo su
amazon-linux-extras install -y nginx1
nginx -version
```
- Start nginx
```
 systemctl start nginx
```
- Open port 80 and access nginx