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Hydra, a Social Network

Introduction

Hydra is a twitter-like social network.

Designs

MVC Figure

image-20221030163639716

UI Mockups

Steps to get your tsung log to local machine

  • Assuming your tsung instance IP address is 34.222.195.237, from your local machine, run rsync -auvL -e "ssh -i Hydra.pem" [email protected]:tsung_logs . to get the logs.

Steps to import data from local DB to AWS RDS

Dump data in a sql file from local db

Since we are using docker as our local environment, first we need to get the docker container name in which the database is running. You can use docker ps command to get this. Then run the following commands:

docker exec -t your-db-container-name pg_dump your-db-name -U your-db-username > your-dump-filename.sql

-a will dump the data only, not the schema. Example:

docker exec -t hydra_db_1 pg_dump app_development -a  -U postgres  > dump_hydra.sql

Run seed file on AWS

  • ssh into app server
  • Run sudo su, then /opt/elasticbeanstalk/bin/get-config environment | jq -r 'to_entries | .[] | "export \(.key)=\"\(.value)\""' > /etc/profile.d/sh.local
  • Run chmod 777 /etc/profile.d/sh.local
  • disconnect from the app server
  • ssh into app server again, then run cd /var/app/current && bin/rails db:seed. Ignore the errors and wait until the command is finished, and the app server should be seeded.

Upload data to AWS RDS

You need to have psql installed on your local machine. psql is a terminal-based front-end to PostgreSQL. For installation, you can use this link.

Then, run following command:

psql -f your-dump-filename.sql --host your-db-hostname-in-aws-rds --port port-used-in-your-aws-rds --username your-aws-rds-dbusername  --dbname your-aws-rds-dbname

AWS RDS database details can be found inside the configuration file of your Elastic Benstalk environment.

Example:

psql -f dump_hydra.sql --host awseb-e-dxp3aesnek-stack-awsebrdsdatabase-slfaoe0pa7gq.cxsnhvva4y19.us-west-2.rds.amazonaws.com --port 5432 --username u  --dbname ebdb

It will ask the password you provided during the deployment.

Done! Now you can see the data browsing your site.

Steps to run Tsung

Create new AWS instance for Tsung

Login to ec2 machine:

ssh -i Hydra.pem [email protected]

Launch Tsung

cd /usr/bin
launch_tsung.sh

This will output the ip address of the ec2 instance. ssh to that machine. Say the ip address is 35.86.238.45

ssh [email protected]

Log into existing Tsung instance

If we have Tsung instances available, we don't need to create new ones. Go to the AWS management website and go to EC2 page. Then click into the instance (named Tsung-Hydra) and click "Connect". You will find "SSH client" tab, which will have something like:

ssh -i "Hydra.pem" [email protected]

Replace the root by ec2-user, and you can log into the instance directly.

Run Tsung test

tsung -f tsung_example.xml -k start

-k flag in the above step : keep the server running even after the test is done, so that we can analyze the various metrics from the test.

Copy tsung logs from ec2 to local:

scp -i local-directory -r [email protected]: Log-directory ~/tsung-paginated-logs-view-users/

Example:

scp -i ~/Downloads/Hydra.pem -r [email protected]:/home/ec2-user/.tsung/log/20221122-0157 ~/tsung-paginated-logs-view-users/ ```