Why is it the Homo sapientatus race is always knowledgably Ignoranting all the time.. ?

This be my first 'rant'.. May I be forgiven for ranting. 😔

Today, I used NAT in a way I never before thought of as a solution to a problem - Exposing a service listening only on an internal address, to the internet, to a selected list of hosts.

For some reason, it made me a little sick in my mouth. It feels... Ugly, to solve this as such. But I was only copying this solution from a different server of the same client, so no reason to implement it differently and thus complicate future administration...

Is it normal to use DNAT like this?

## Learning k8s

Interesting. So sometimes k8s network goes down. Apparently it's a pitfall that has been logged with vendor but not yet fixed. If on either of the nodes networking service is restarted (i.e. you connect to VPN, plug in an USB wifi dongle, etc..) -- you will lose the flannel.1 interface. As a result you will NOT be able to use kube-dns (because it's unreachable) not will you access ClusterIPs on other nodes. Deleting flannel and allowing it to restart on control place brings it back to operational.

And yet another note.. If you're making a k8s cluster at home and you are planning to control it via your lappy -- DO NOT set up control plane on your lappy :) If you are away from home you'll have a hard time connecting back to your cluster.
A raspberry pi ir perfectly enough for a control place. And when you are away with your lappy, ssh'ing home and setting up a few iptables DNATs will do the trick

netikras@netikras-xps:~/skriptai/bin$ cat fw_kubeadm
#!/bin/bash

FW_LOCAL_IP=127.0.0.15
FW_PORT=6443
FW_PORT_INTERMED=16443
MASTER_IP=192.168.1.15
MASTER_USER=pi

FW_RULE="OUTPUT -d ${MASTER_IP} -p tcp -j DNAT --to-destination ${FW_LOCAL_IP}"

sudo iptables -t nat -A ${FW_RULE}

ssh home -p 4522 -l netikras -tt \
-L ${FW_LOCAL_IP}:${FW_PORT}:${FW_LOCAL_IP}:${FW_PORT_INTERMED} \
ssh ${MASTER_IP} -l ${MASTER_USER} -tt \
-L ${FW_LOCAL_IP}:${FW_PORT_INTERMED}:${FW_LOCAL_IP}:${FW_PORT} \
/bin/bash
# 'echo "Tunnel is open. Disconnect from this SSH session to close the tunnel and remove NAT rules" ; bash'

sudo iptables -t nat -D ${FW_RULE}

And ofc copy control plane's ~/.kube to your lappy :)

Does someone have an idea how to use synproxy and nat (dnat and snat) together on one machine? It's basically a router which should also act as a ddos filter, but when I install synproxy, the natting doesn't work anymore...
I can't really find something on the internet so help would be appreciated.

Thanks in advance

Why is cloudformation the way it is?

My stacks take over 10 minutes to execute, only for it to fail because of a small misconfiguration.

Why does it take 10 minutes to create a route53 record set through cloudformation, but takes less than a second to create through the web console? That is pathetic.

The people working on cloudformation should be absolutely ashamed of themselves.