Centos 9 firewall management

# Allow connection to tcp port 3389 for rdp

sudo firewall-cmd --add-port=3389/tcp

sudo firewall-cmd --runtime-to-permanent

# Allow connection to tcp port 5001 for iperf server

sudo firewall-cmd --add-port=5001/tcp

# List firewall config 
sudo firewall-cmd --list-all

Useful Links for VMware by Broadcom Day 2 Transition

Source: https://williamlam.com/2024/05/useful-links-for-vmware-by-broadcom-day-2-transition.html

Installing vCenter 8.0 U3: A problem occured while reading the OVA-FIle, Type Error on RHEL 9 and Centos 9

Source: https://community.broadcom.com/vmware-cloud-foundation/discussion/installing-vsphere-7-a-problem-occured-while-reading-the-ova-file-type-error

Source: https://www.dell.com/support/manuals/en-us/vmware-esxi-8.x/vmware_8.x_rn_pub/known-issues?guid=guid-ea80ce97-07db-402f-a99c-36109663f276&lang=en-us

 - Are you deploying vCenter from a Redhat workstation by any chance?

If so try installing the libnsl package via the command dnf install libnsl then then try deploying again!

Coredump partition sizing on a vSAN

Source: https://www.vexpertconsultancy.com/2018/03/coredump-partition-sizing-on-a-vsan-6-6-esxi-node/

Source: https://core.vmware.com/resource/vmware-vsan-design-guide#sec6864-sub4

Core Dump  

Without vSAN activated: 

For every 1 TB of DRAM, there should be a core dump size partition of 2.5 GB

With vSAN OSA activated: 

In addition to the core dump size, the physical size of the size of caching tier SSD(s) in GB will be used as the basis of calculation the additional core dump size requirements

The base requirement for vSAN is 4GB

For every 100GB cache tier, 0.181GB of space is required

Every disk group needs a base requirement of 1.32 GB

Data will be compressed by 75%

Example: 

ESXi 1.5TB RAM + vSAN ESA Enabled

(2.5 GB + 1.25 GB) for ESXi RAM + 4 GB for vSAN = 7.75 GB

75% compression of 7.75 GB = 1.9375 GB ~= 2 GB

 

Creating self-signed SSL certificates with OpenSSL

 Source: https://www.devdungeon.com/content/creating-self-signed-ssl-certificates-openssl

How to add trusted CA certificate on CentOS/Fedora

Source: https://www.devdungeon.com/content/how-add-trusted-ca-certificate-centosfedora

How To install XRDP

In this blog post we show how to install XRDP on various operating systems.