/Linux-Commands

Useful Linux Commands

MIT LicenseMIT

Linux-Commands

Useful Linux Commands

Rerouting ports

iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080

or

iptables -t nat -A OUTPUT -o lo -p tcp --dport 80 -j REDIRECT --to-port 8080

Useful for redirecting ports i.e

iptables -A INPUT -i eth0 -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -i eth0 -p tcp --dport 8080 -j ACCEPT
iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080

then to save config

 sudo apt-get install iptables-persistent

or if configured

 sudo dpkg-reconfigure iptables-persistent

then

sudo iptables-save | sudo tee /etc/iptables/rules.v4
sudo ip6tables-save | sudo tee /etc/iptables/rules.v6

Active ports

netstat -ntlp | grep LISTEN

Useful to check ports actively open

Other Useful Commands

Other useful commands

Docker

Useful docker commands

Installing Docker CLI

sudo apt-get install      ca-certificates      curl      gnupg      lsb-release
echo   "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
 $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update
sudo apt-get update  sudo apt-get install docker-ce docker-ce-cli containerd.io
sudo apt-get install docker-ce docker-ce-cli containerd.io

Useful to install docker for unbuntu

Docker pull

docker pull [repository]/[name]:[tag]

Useful for pulling public repositories off docker hub

Docker run

docker run -p 8080:[port] [repository]/[name]:[tag]

Useful for running docker at specific ports. Note: prefix with screencmd to run after ssh connection closed

Docker running containers

docker ps

Useful for checking running containers

Docker stop running containers

docker stop [repository]/[name]:[tag]

Useful to stop running containers