K3s installation

K3s

K3s installation

curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="--disable=traefik@server:0 --tls-san=121.6.45.41 --cluster-cidr=10.10.0.0/16" sh -

sudo cat /etc/rancher/k3s/k3s.yaml

Update DNS Name Server

first install resolvconf if not installed
sudo apt update
sudo apt install resolvconf

check resolvconf service started and enabled
sudo systemctl status resolvconf.service

if service is not enabled you can start and enable it with :
sudo systemctl start resolvconf.service
sudo systemctl enable resolvconf.service

now edit resolv.conf.d/head configuration file
sudo nano /etc/resolvconf/resolv.conf.d/head

add your DNS addresses to this file for example I use (8.8.8.8 and 8.8.4.4)
nameserver 8.8.8.8 
nameserver 8.8.4.4

now force resolvconf to run update scripts when invoked with -u
sudo resolvconf    --enable-updates 

now run updates
sudo resolvconf -u

now if you check cat /etc/resolv.conf you must see your DNS configuration in this file if not try these commands and check again
sudo systemctl restart resolvconf.service
sudo systemctl restart systemd-resolved.service


Disable IP6
sudo nano /etc/sysctl.conf

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

sudo sysctl -p

sudo iptables -F
sudo update-alternatives --set iptables /usr/sbin/iptables-legacy
sudo update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
sudo reboot