# During Setup
npm install/npm ci
composer install
npm run gulp
# Clear cache in local
echo 'flush_all' | nc localhost 11211;
# SQLMAP SQLi check
sqlmap -u 'https://www.codechef.com/api/list/contests/all?sort_by=END&sorting_order=desc&offset=0' --flush-session --dbms=mysql --technique=B -p sorting_order --level 2 --tamper=between
# SALT cmd
sudo salt 'ide*' cmd.run 'sudo pkill -9 "s3fs" && cd /var/www/codechef/current && sudo php scripts/check_s3fs.php'
sudo fusermount -u /mnt/codechef_private && sudo fusermount -u /mnt/codechef_shared && sudo php /mnt/codechef.php
## After merging the SALT PR run below command to update the salt file
sudo su
/bin/bash /root/salt-sync.sh
sudo salt 'web*' cmd.run 'salt-call state.highstate'
sudo salt 'web*' cmd.run 'sudo service nginx restart'
## Deploy on all the servers during the contest
# Check version on each server:
sudo salt 'web*' cmd.run 'cat /var/www/codechef/current/version'
# Deploy latest version on each server:
sudo salt 'web*' cmd.run '/etc/deploy_scripts/trigger_build.sh'
# During manual deploy, parameter store is updated first. So you can just start manual deploy and then run the above command on ops.
## Grant permissions on a folder
chmod u+w sites/default/settings.php
chmod u+w sites/default/
# Exec moss on local
scripts/./moss -l cc -d <dir_name>
# Clear all local branches
git branch | grep -v "master" | xargs git branch -D
# AWS Copy cmd to transfer from one bucket to another
aws s3 cp --recursive s3://codechef_shared/images/certifications/ s3://cdn-bucket-public/images/certifications/
# Running Selenium grid `command`
java -Dwebdriver.chrome.driver=/usr/local/bin/chromedriver -jar /usr/local/bin/selenium-server-standalone-3.141.59.jar
contest.php
npm init &&
npm install --save selenium-webdriver chromedriver geckodriver
# File listing `command`
ls -laSh; # Sort based on the size
# Generate rsa public key
ssh-keygen -t rsa
pbcopy < ~/.ssh/id_rsa.pub
# The key has to be stored inside
/etc/.ssh/authenticated_keys
# Find and replace
sed -i 's/from-text/to-text/g'
# Write a protected command
:w !sudo tee %
# The chkconfig command can also be used to activate and deactivate services.
chkconfig --list
# Find running apps on PORT
sudo lsof -i -P -n | grep LISTEN
# Find EBS volume id on AWS from server
df -h
ebsnvme-id /dev/nvme1n1
OR
lsblk -o NAME,MOUNTPOINT,SIZE,SERIAL
# Extend EBS storage with same i-nodes
df -i
sudo resize2fs /dev/nvme0n1p1
# Increase EBS size of current disk:
# https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/recognize-expanded-volume-linux.html
sudo lsblk
sudo growpart /dev/nvme0n1 1
# XFS
sudo xfs_growfs -d /path
OR
sudo xfs_growfs /dev/nvme0n1p1
# EXT4
sudo resize2fs /dev/nvme0n1p1
# Change the file permission
sudo chown jenkins:jenkins -R /var/lib/jenkins/capistrano/<your_repository_name>
# Change the password of a http nginx user
sudo htpasswd /etc/nginx/.htpasswd <username>
# NGROK to localhost
#download ngrok from
#https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-amd64.zip
#unzip ngrok-stable-linux-amd64.zip
./ngrok http -host-header=www.acodechef.com 80
# Find the number of lines in each file with name inside a directory
# https://unix.stackexchange.com/questions/260630/how-do-you-list-number-of-lines-of-every-file-in-a-directory-in-human-readable-f
wc -l `find /path/to/directory/ -type f`
# GITHUB delete tag
git push origin :refs/tags/3.15
#ZIP folder
# https://devconnected.com/how-to-zip-folder-on-linux/
zip -r <output_file> <folder_1> <folder_2> ... <folder_n>
# ssh to OPENVPN
ssh openvpnas@3.214.204.205 -o StrictHostKeyChecking=no
# SSH issue in Ventura
vim /etc/ssh/ssh_config
Host *
HostkeyAlgorithms +ssh-rsa
PubkeyAcceptedAlgorithms +ssh-rsa
:w !sudo tee %
# Add basic auth in nginx
sudo sh -c "echo -n '<username>:' >> /etc/nginx/.htpasswd"
sudo sh -c "openssl passwd -apr1 >> /etc/nginx/.htpasswd" # Now enter the password
# Geeks for Geeks remove login bar
# execute these on console
$('body').css({"overflow": "auto", "position" : "absolute"});
window.onscroll = {};
$('.login-modal-div').remove();
# Backup data to EC2, web102.
cd ~/codechef/codechef/sites/all/modules && cp ~/codechef/codechef/.env ~/codechef/codechef/sites/all/modules/ravi_module_test/env.bck && cp ~/.zshrc ~/codechef/codechef/sites/all/modules/ravi_module_test/zshrc.bck && zip -r ravi_module_test.zip ravi_module_test && scp ravi_module_test.zip ravikant@52.7.66.88:/home/ravikant/ && rm ravi_module_test.zip
# Local Tunnel (Used to expose local environment to internet)
npm install -g localtunnel
lt --port 80 --local-host www.acodechef.com --subdomain acodechef --print-requests
# Restart php-fpm & nutcraker on all servers
salt 'web*' cmd.run 'service php-fpm stop'
salt 'web*' cmd.run 'service nutcracker restart'
salt 'web*' cmd.run 'service php-fpm start'
# Run Rankings Code
php /var/www/rankings/current/update_rankings.php --service CodeChef -delay 1000
# Generate random SSL Certificate
apt install openssl
openssl genrsa -out <name>.key 2048
openssl req -x509 -new -key <name>.key -out <cacert>.pem -days 365
# Kill queries running for more that 20 seconds
out1=$(mysql -ucodechef -p<passowrd> -hccdbinstance.c7teckpg2ocf.us-east-1.rds.amazonaws.com --disable-column-names -e "select concat('KILL ',id,';') from information_schema.processlist where user = 'codechef' and time > 20;")
out2=$(mysql -ucodechef -p<passowrd> -hccdbinstance.c7teckpg2ocf.us-east-1.rds.amazonaws.com --disable-column-names -e "$out1")
## Transfer file faster from S3 to local
Checkout https://github.com/peak/s5cmd
s5cmd --credentials-file ~/.your-credentials-file cp 's3://codechef_private/solutions/*' ./your-local-directory
Make sure you use server with large number of cores
## Labs Start Nginx Proxy
docker run --detach \
--name nginx-proxy \
--publish 80:80 \
--volume /var/run/docker.sock:/tmp/docker.sock:ro \
nginxproxy/nginx-proxy:1.7
# TESTING PART