basic linux commands

basic-linux-commands.txt

//to generate public & private keys
ssh-keygen -t rsa -b 4096

//Login to Linux VM
ssh -i C:\Users\Varaprasad.Reddy\Downloads\vm-loadbalancer1-dev_key.pem azureuser@ip_address

//to get current machine ip address
curl ifconfig.me

//to change user to root user
sudo su -

//to get the updates of packages
sudo apt update

//to install the updates of packages
sudo apt upgrade

//install a package
sudo apt-get install nginx

//check the status of a service
sudo systemctl status nginx

//to restart a service
sudo systemctl restart nginx

systemctl reload nginx

//firewall commands in Linux
sudo ufw status

sudo ufw enable

sudo ufw allow 'Nginx HTTP'

sudo ufw allow ssh or sudo ufw allow 22/tcp 

sudo ufw allow 8080

sudo ufw reload


# to get nginx default html page location & config location
nginx -V

# to get nginx default html page location
cd /etc/nginx/sites-enabled

cd  /var/www/html

change the content of the html file and save it

# reload and restart the nginx server to reflect the changes.
systemctl reload nginx

sudo systemctl restart nginx


//to ping a URL
curl http://52.226.200.153/api/HttpExample?name=prasad


to copy a file from local machine to remote machine

scp -i C:\Users\Varaprasad.Reddy\Downloads\ansible-server_key.pem C:\Users\Varaprasad.Reddy\Downloads\vsts-agent-linux-x64-3.232.3.tar.gz adminuser@40.71.64.116:/home/adminuser/Downloads

ssh-copy-id -i ~/pem_keys/jenkins-server-key.pem azureuser@20.231.92.54

sudo service --status-all

sudo service docker status
 
ps -aux | grep docker