EC2 instance by tankey

EC2

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Created 6 months ago

Updated 6 months ago

EC2 instance by tankey

1	tankey style ec2 banayune with ngnix pani
2
3	HIGH-LEVEL ARCHITECTURE
4	VPC
5	├── Public Subnet (EC2-1)
6	├── Public Subnet (EC2-2)
7	├── Internet Gateway
8	└── Route Table → Internet
9	⚙️ STEP-BY-STEP (Algorithm Style)
10	🔹 STEP 1: Create VPC
11
12	Go to → VPC Dashboard
13
14	Click Create VPC
15	Choose:
16	Name: MyVPC
17	CIDR: 10.0.0.0/16
18	Create
19
20	👉 This is your private network
21
22	🔹 STEP 2: Create 2 Subnets
23
24	Go to Subnets → Create subnet
25
26	Subnet 1:
27	Name: Public-Subnet-1
28	CIDR: 10.0.1.0/24
29	AZ: any
30	Subnet 2:
31	Name: Public-Subnet-2
32	CIDR: 10.0.2.0/24
33
34	👉 Both are PUBLIC (we’ll configure next)
35
36	🔹 STEP 3: Create Internet Gateway
37	Go to Internet Gateways
38	Create → Name: MyIGW
39	Attach to your VPC
40
41	👉 Now your VPC can talk to internet
42
43	🔹 STEP 4: Create Route Table
44	Go to Route Tables → Create
45	Name: Public-RT
46	Attach to VPC
47	Add Route:
48	Destination: 0.0.0.0/0
49	Target: Internet Gateway
50
51	👉 Means: "Send all internet traffic outside"
52
53	🔹 STEP 5: Associate Subnets
54	Open Route Table → Subnet Associations
55	Attach both subnets
56
57	👉 Now both subnets are PUBLIC
58
59	🔹 STEP 6: Enable Auto Public IP
60
61	For each subnet:
62
63	Edit settings → Enable Auto-assign public IP
64
65	👉 Without this, EC2 won’t get public IP
66
67	🔹 STEP 7: Create Security Group
68
69	Go to EC2 → Security Groups
70
71	Create:
72
73	Name: Web-SG
74	Add rules:
75	SSH (22) → My IP
76	HTTP (80) → Anywhere
77
78	👉 Allows login + web access
79
80	🔹 STEP 8: Create Key Pair
81
82	Go to EC2 → Key Pairs
83
84	Name: my-key
85	Download .pem
86
87	👉 Needed for SSH
88
89	🔹 STEP 9: Launch EC2 Instance 1
90
91	Go to EC2 → Launch Instance
92
93	Name: EC2-1
94	AMI: Amazon Linux
95	Instance type: t2.micro
96	Key pair: my-key
97	Network:
98	VPC: MyVPC
99	Subnet: Public-Subnet-1
100	Auto IP: Enabled
101	Security Group: Web-SG
102
103	Launch
104
105	🔹 STEP 10: Launch EC2 Instance 2
106
107	Same as above but:
108
109	Name: EC2-2
110	Subnet: Public-Subnet-2
111	🔹 STEP 11: SSH into EC2
112
113	In terminal:
114
115	chmod 400 my-key.pem
116
117	ssh -i my-key.pem ec2-user@<PUBLIC-IP>
118
119	👉 Now you are inside your server
120
121	🌐 (OPTIONAL) STEP 12: Create Load Balancer
122
123	Go to EC2 → Load Balancers
124
125	Create Application Load Balancer
126	Choose:
127	Internet-facing
128	Select your VPC
129	Select both subnets
130	Create Target Group:
131	Add both EC2 instances
132	Attach to Load Balancer
133
134	👉 Now traffic is distributed between EC2-1 and EC2-2
135
136	🧠 FINAL UNDERSTANDING
137
138	You just built:
139
140	VPC = network
141	Subnets = zones
142	IGW = internet access
143	Route table = traffic rules
144	SG = firewall
145	EC2 = servers
146	Load balancer = traffic distributor
147
148
149	When you install Nginx on EC2:
150
151	It runs a web server on port 80
152	When you open EC2 public IP → it serves default page
153	⚙️ STEP 1: Launch EC2 Instances (already done)
154
155	Make sure both:
156
157	In public subnet
158	Have public IP
159	Security Group allows:
160	HTTP (80)
161	SSH (22)
162	🔐 STEP 2: SSH into EC2-1
163	ssh -i my-key.pem ec2-user@<EC2-1-PUBLIC-IP>
164	📦 STEP 3: Install Nginx on EC2-1
165	Amazon Linux:
166	sudo yum update -y
167	sudo yum install nginx -y
168
169	Start service:
170
171	sudo systemctl start nginx
172	sudo systemctl enable nginx
173
174	Check status:
175
176	systemctl status nginx
177	🌐 STEP 4: Test EC2-1
178
179	Open browser:
180
181	http://<EC2-1-PUBLIC-IP>
182
183	👉 You should see: Nginx Welcome Page
184
185	🔁 STEP 5: SSH into EC2-2
186	ssh -i my-key.pem ec2-user@<EC2-2-PUBLIC-IP>
187	📦 STEP 6: Install Nginx on EC2-2
188
189	Run same commands:
190
191	sudo yum update -y
192	sudo yum install nginx -y
193
194	sudo systemctl start nginx
195	sudo systemctl enable nginx
196	🌐 STEP 7: Test EC2-2
197	http://<EC2-2-PUBLIC-IP>
198
199	👉 You should see same Nginx page
200
201	🎨 (OPTIONAL) STEP 8: Customize each server (IMPORTANT for learning)
202
203	On EC2-1:
204
205	echo "Hello from EC2-1" \| sudo tee /usr/share/nginx/html/index.html
206
207	On EC2-2:
208
209	echo "Hello from EC2-2" \| sudo tee /usr/share/nginx/html/index.html
210
211	Now:
212
213	EC2-1 IP → shows “Hello from EC2-1”
214	EC2-2 IP → shows “Hello from EC2-2”
215	🧠 WHAT IS HAPPENING
216	Nginx is listening on port 80
217	EC2 public IP routes traffic to instance
218	Security Group allows HTTP traffic
219	Nginx responds with HTML page
220	⚠️ COMMON MISTAKES
221
222	❌ No HTTP rule in Security Group → page not opening
223	❌ Nginx not started → connection refused
224	❌ Using private IP → won’t work
225	❌ Wrong AMI commands (Amazon Linux vs Ubuntu)
226
227	🚀 NEXT LEVEL (important)
228
229	Now you can upgrade this setup:
230
231	👉 Add Load Balancer so you don’t need to use IPs
232	👉 Access both EC2 via single DNS
233	👉 Enable auto failover
234
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