How to check "lastb" in logs? (redhat)

When someone has bad password or not ssh keys. 

User root not allowed because shell bash does not exist

 

or permission denied via ssh keys? 

How to allow 22 port via ufw?

 How to allow 22 port via ufw?

How to get serial number?

How to get serial number?

Cgroups - kernel control group: ssh task

 How to use set-property or cgroups. 

output from ping -I

ping -c 3 -I (name network card) google.com

 

 

ping -I

 
ping -I

wicked configuration on Suse 15

wicked configuration:

How configure network in suse linux?

dstat on suse

 If we need next monitoring, try dstat. 

net-tools-deprecated on Suse 15

 how to install route, ifconfig on suse 15? 

 

zypper --non-interactive

 zypper --non-interactive ---> what is it?