AfterShip Challenge for SRE

Step 1: First of all. Create a 3-tier architecture using GCP.

https://managementmania.com/en/three-tier-architecture

(1) Created SQL instance with mysql on GCP.

• name: rdb, userid: db, password:db, database: mysql

(2) Created instance group "instance-group-1" for auto scaling.

(3) Created VM instance with Centos7 for web server.

• I have installed the lastest version of PHP and apache on this instance.

Step 2: Create Table called "visitor_counter" by executing the below SQL statement on SQL instance.

CREATE TABLE 'visitor_counter' ( 'counts' int(10) NOT NULL default '0' )

Step 3: Create index.html File.

(1) It should be located in apache default directory can be found on httpd.conf file

• /var/www/html

(2) Add index.php in DirectoryIndex line on middle of httpd.conf file.

Step 4: Create results.php File for POST request.

Script Logic

(1) Database Connection

• I have to provide the database credentials to connect with my database.

(2) Select Total Numbers of Users

• Execute simple select query to get the total count from the database table.
• If total = 0 means first visitor in this case insert the value in table.

(3) Print unix time, count and message

• Display the timestamp as unix time, total count as visitor Count, and message.

(4) Increment

• Increment the total number by 1 to update the total numbers of counts.

Step 5: Upgrade Security.

(1) Activate https

• Encrypt communication to and from my website using SSL
• I have registered cloudflare nameserver on my domain registrar.
• Redirect all requests with scheme “http” to “https”.

(2) Block all unused port.

• Setting up rules on GCP firewall.

(3) Enable SElinux and iptables on VM instance.

Step 6: Support High Availability.

• Make load balancer on GCP with my instance group.
• An load balancer spreads load across backend services, which distributes traffic among instance groups.

Step 7: Please visit below link.

• https://www.dongjin.bid