Just a collection of stuff I use to troubleshoot Docker and networking issues

linux_docker_networking_stuff

#Stop/Remove a specific Docker Container
docker stop containername && docker rm containername

#Stop all containers with "backend" in it:
docker  rm $(docker ps -a | grep backend | cut -f1 -d' ')

#Stop all Docker Containers
docker stop $(docker ps -aq)

#Remove all Docker Containers
docker rm $(docker ps -aq)


#To capture TCP data from a Docker Container
IP=`docker inspect containername | grep 'IPAddress":' | cut -f4 -d'"' | head -1` && sudo tcpdump -i docker0 host $IP


#Show all iptables rules
sudo iptables -L

#Show all iptables rules with line numbers
sudo iptables -L --line-numbers

#To delete a rule, do a -D followed by the Chain name (INPUT) followed by the line number (3)
sudo iptables -D INPUT 3


#Turn off iptables (do this all on one line, or else your SSH session will die)
sudo iptables -F && sudo iptables -X && sudo iptables -P INPUT ACCEPT && sudo iptables -P OUTPUT ACCEPT && sudo iptables -P FORWARD ACCEPT

#Persist current firewall settings by saving them here
iptables-save > /etc/iptables/rules.v4

#Save current firewall rules to a file
sudo iptables-save > fw.rules

#Restore firewall rules from a file
sudo iptables-restore fw.rules


#Hand-edit firewall rules here:
sudo vi /etc/iptables/rules.v4

#SCP a file from my local machine to a remote one:
scp ciscat-full-bundle-2019-09-25-v3.0.61.zip username@remotehost:ciscat-full-bundle-20
19-09-25-v3.0.61.zip

#SCP a file from a remote machine to my mine:
scp user@remotehost:cis-cat-full/results/filename.html filename.html