Create a instance with Ubuntu OS and with instance type as t2.nano and selected the existing key pair and security group and set 2 instance to create and launch.
Run the apdt update and install apache webserver and modify the index.html
sudo apt update
sudo apt install apache2 -y
sudo rm /var/www/html/index.html
sudo vim /var/www/html/index.html
<h1>Auto Scaling Group with Load Balancer</h1>Go to Action >Image and Template > Create Image
- Create an image template by enabling noboot option.
Now create Target group and Load Balancer
- Target Groups was created as "demo-tg"
- Load balancer also created as "demo-lb"
- Launch template was created with the AMI Image.
Create Auto scaling Group >Select the template >Select all network availability zone >Select Load balancing.
On Load balancing setup select the "Attach to an existing Load Balancer"
Group size >Desired capacity as 2 >Traget tracking scaling policies,Set Execute policy with CPU utilisation exceeds 50.
Select instance maintance policy as "Launch before Terminating"
Add Notification >Create a topic and provide name of the topic and email ID to send notification > Unselect "Fail to launch & Terminate"
- Auto Scaling group has been create and launch the Instance from the AMI Image Template. you can monitor on the Activity tab.
- Verfiy the instance status
- On Cloud watch > Alarms> verify the scaling target alarm in detail.
- Login to the 2 instance created by Auto Scaling groups and execute these commands to see the CPU utilisation and execute the cmd to exceed the CPU utilisation.
topyes > /dev/null &
ubuntu@ip-172-31-1-56:~$ yes > /dev/null &
[1] 918
ubuntu@ip-172-31-1-56:~$ top
top - 15:16:41 up 18 min, 1 user, load average: 0.08, 0.02, 0.01
Tasks: 101 total, 2 running, 99 sleeping, 0 stopped, 0 zombie
%Cpu(s): 75.0 us, 25.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 446.5 total, 24.5 free, 148.0 used, 274.0 buff/cache
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 269.6 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
918 ubuntu 20 0 5764 1920 1920 R 93.8 0.4 0:05.42 yes
- It will exceed the CPU utilisation and trigger the ASG with Load balancer and create another instance.
- Cloud watch Alram Notification.
- To kill the cmd which we have run to exceed the CPU utilisation.Run the cmd with kill "PID".
ubuntu@ip-172-31-1-56:~$ kill 918
ubuntu@ip-172-31-1-56:~$ top
top - 15:33:28 up 35 min, 2 users, load average: 0.85, 0.94, 0.68
Tasks: 98 total, 1 running, 97 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 446.5 total, 17.4 free, 152.4 used, 276.6 buff/cache
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 265.1 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 166200 11352 8280 S 0.0 2.5 0:04.58 systemd
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