K3s Rancher Installation Note

Bulk remove containers/images

docker stop $(docker ps -a -q) 

docker rm $(docker ps -a -q)  

docker rmi $(docker images -a -q) 

Dashboard "404 page not found"

docker run -d --privileged --restart=unless-stopped -p 80:80 -p 443:443

Those are occupied common port, we may use some other port (8081:80,9443:433) to bypass

Reset rancher login password

docker exec -ti <container_id> reset-password

change root password

echo root:imafish | chpasswd

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sudo iptables -t nat -A PREROUTING -p tcp --dport 53 -j DNAT --to-destination 127.0.0.53:30001

sudo iptables -t nat -A PREROUTING -p udp --dport 53 -j DNAT --to-destination 127.0.0.53:30001

sudo iptables -D -t nat -A PREROUTING -p udp --dport 53 -j DNAT --to-destination 127.0.0.1:30001

sudo iptables -t nat -v -L PREROUTING -n --line-number

sudo iptables -t nat -D PREROUTING

sudo iptables -I INPUT -p tcp -m tcp --dport 53 -j ACCEPT

sudo iptables -I INPUT -p udp -m udp --dport 53 -j ACCEPT

sudo iptables -S --line-number

Free port 53

https://www.linuxuprising.com/2020/07/ubuntu-how-to-free-up-port-53-used-by.html