kubernetes-stuff

Useful kubernetes resources

Scripts

• open_port.sh / close_port.sh

It applies different iptables rules to be able to access to containers from outside (through public IP). It works well if you have installed kubernetes on a single node.

For example, if you want to open to internet port 80, your container's service is running on 8080, your private container IP is 192.168.134.67, the private IP of your container host is 192.168.134.64, your public interface is eth0 and the private interface is tunl0, you can execute the following to access port 80 using the public IP and access port 8080 on your private container:

open_port.sh 80 8080 192.168.134.67 192.168.134.64 eth0 tunl0

After that, if you want to revert all the changes you can execute:

close_port.sh 80 8080 192.168.134.67 192.168.134.64 eth0 tunl0

You can check what rules have been applied by:

iptables -S | grep $PUBLIC_PORT

or

iptables -t nat -S | grep $PUBLIC_PORT

secret.yaml

It creates a secret. The secret value has to be encoded on base64. For example:

echo -n "--argumentsRealm.passwd.jenkins=CHANGE_ME --argumentsRealm.roles.jenkins=admin" | base64

It gives two lines:

LS1hcmd1bWVudHNSZWFsbS5wYXNzd2QuamVua2lucz1DSEFOR0VfTUUgLS1hcmd1bWVudHNSZWFs bS5yb2xlcy5qZW5raW5zPWFkbWlu

So we have to write all in one line:

LS1hcmd1bWVudHNSZWFsbS5wYXNzd2QuamVua2lucz1DSEFOR0VfTUUgLS1hcmd1bWVudHNSZWFsbS5yb2xlcy5qZW5raW5zPWFkbWlu