Task 1(a): Develop the cloud-init Script:

Create a compute instance pbt_cloud_init_vm_01 with the following properties:

Shape: VM.Standard.A1.Flex instance with 1 OCPU and 6 GB memory

Image: Oracle Linux 8

Placement: Use any of the availability domains

Network:

Place in the public subnet Cloud-Init Challenge SNT

Assign a public IPv4

Use the SSH public key

Add a cloud-init script and perform the following:

Use yum or dnf to install httpd.

Use systemctl to enable and start httpd

Open the firewall to http:

sudo firewall-offline-cmd --add-service=http

systemctl restart firewalld

Mark Complete

Task 1(b): Use cloud-init to Configure Apache on Instances in an Autoscaling Instance Pool:

You're deploying an Apache-based web application on OCI that requires horizontal autoscaling.

To  configure instances upon provisioning, write a cloud-init script for  Oracle Linux 8 that installs and enables Apache (httpd), and opens the  firewall for HTTP on TCP port 80. Create an instance configuration and  include the cloud-init script in it. Use this instance configuration to  create an instance pool and autoscaling configuration.

Task 2: Create an Autoscaling Instance Pool Including the cloud-init Script:

Create an instance configuration named pbt_cloud_init_config_01 with the following properties:

Shape: VM.Standard.A1.Flex instance with 1 OCPU and 6 GB memory

Image: Oracle Linux 8

Placement: Use any of the availability domains

Network:

Place in the public subnet Cloud-Init Challenge SNT

Assign a public IPv4

Use the SSH public key

Attach the cloud-init script created in Task 1

Create  an instance pool named pbt_cloud_init_pool_01 with one instance by  using the instance configuration pbt_cloud_init_config_01

Create and attach an autoscaling configuration named pbt_cloud_autoscaling_config_01 with the following settings:

Metric-based autoscaling

Cooldown: 300 second

Performance metric: CPU utilization

Scale-out rule:

Operator: Greater than (>)

Threshold: 75%

Number of instances to add: 1

Scale-in rule:

Operator: Less than (<)

Threshold: 25%

Number of instances to remove: 1

Scaling limits:

Minimum number of instances: 1

Maximum number of instances: 2

Initial number of instances: 1

Task 1: Develop the cloud-init script

In the main menu, go to Compute > Instances and click Create an Instance

In the instance creation menu, enter the following details

   a. Name: Provide name given in the instructions

   b. Compartment: Use the assigned compartment

   c. Placement: Use any of the availability domains

   d. Image: Oracle Linux 8

   e. Shape: VM.Standard.A1.Flex instance with 1 OCPU and 6 GB memory

   f. Network:

       i. Place in the public subnet

      ii. Assign a public IPv4

   g. SSH keys: Upload or paste the provided SSH public key

   h. Boot volume: Leave as default

   i. Under advanced options, add the following cloud-init script:

#!/bin/shsudo dnf install httpd --assumeyes --quietsudo systemctl enable httpdsudo systemctl start httpdsudo firewall-offline-cmd --add-service=httpsystemctl restart firewalld       

   j. Create the instance.

Task 2: Create an autoscaling instance pool including the cloud-init script

1. In the main menu, go to Compute > Instance Configurations. Click Create instance configuration.

  a. In the instance configuration creation menu, enter the same details as before:

  b. Name: Provide name given in the instruction/if not specified provide any name

  c. Compartment: Assigned compartment

  d. Placement: Use any of the availability domains

  e. Image: Oracle Linux 8

  f. Shape: VM.Standard.A1.Flex instance with 1 OCPU and 6 GB memory

  g. Network:

     i. Place in the public subnet

    ii. Assign a public IPv4

   h. SSH keys: Upload or paste the provided SSH public key

   i. Boot volume: Leave as default

   j. Under advanced options, add the following cloud-init script:

#!/bin/shsudo dnf install httpd --assumeyes --quietsudo systemctl enable httpdsudo systemctl start httpdsudo firewall-offline-cmd --add-service=httpsystemctl restart firewalld       

   k. Create the instance configuration.

Task 2: In the main menu, go to Compute > Instance Pools. Click Create instance pool.

Enter the following details:

a. Name: Provide name given in the instruction/if not specified provide any name

b. Compartment: Assigned compartment

c. Instance configuration: Created in last step

d. Number of instances: 1

e. Select any availability domain

f. Leave fault domain unselected

g. Primary VNIC: Provided VCN in the instructions

h. Subnet: Public subnet

i. Do not attach a load balancer

j. Create the instance pool

Task 3: In the main menu, go to Compute > Autoscaling Configurations. Click Create autoscaling configuration and enter the following details:

a. Name: Provide name given in the instruction/if not specified provide any name

b. Compartment: Assigned compartment

c. Instance Pool: Created in last step

d. Select Metric-based autoscaling

e. Autoscaling policy name: Does not matter

f. Cooldown: 300 seconds

g. Performance metric: CPU utilization

h. Scale-out rule:

i. Operator: Greater than (>)

ii. Threshold: 75%

iii. Number of instances to add: 1

i. Scale-in rule:

i. Operator: Less than (<)

ii. Threshold: 25%

iii. Number of instances to remove: 1

j. Scaling limits:

i. Minimum number of instances: 1

ii. Maximum number of instances: 2

iii. Initial number of instances: 1

k. Create the autoscaling configuration.