How to protect /etc/resolv.conf after reboot? (use the chattr command)

 How to protect /etc/resolv.conf after reboot? 

problems with table create user in icingaweb

problems with table create user in icingaweb: 

db troubleshooting of icinga webpage

 db troubleshooting of icinga webpage: 

How to add "live Suse" to virtualbox

 like this: 

Missing value auth-url required for auth plugin password (openstack)

 

openstack issues

how to check open ports via nc?

 how to check open ports via nc?

$ nc -zv 10.0.32.15 22

-z - only checking, no sending data

-v - verbose

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. 

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. 

How to sum files and directories in linux?

How to sum files and directories in linux? (try find and wc)

ssh -issue: no hostkeys available --exiting

 I installed Ubuntu 22.04 server for testing in my "ansible learning". First problem was with ssh. Ssh is very necessary in ansible communication. How it fixed? 

"problem with proxy to repository server" (problem with bad installation auditd)

 proxy problem

_netdev

(I tried this case study on Almalinux 9 and Almalinux8)

CASE STUDY: ROUTING ISSUE

 

CASE STUDY:  ROUTING ISSUE 

How to install wordpress via docker?

 How to install wordpress via docker?