Red Hat: Adding unused disk space to the existing volume group
If you have some unused disk space and want to add to the volume group.No data will be lost on existing volume. root@localhost ~]# df -h Filesystem Size Used Avail…
RED HAT : booting to rescue mode using DVD iso
Normally, I do not carry out major maintenance on Friday. If something goes wrong it will ruin your whole weekend. I've been enabling FIPS on all Red Hat servers to…
RED HAT: Extending Logical Volumes
Had a situation whereby /opt was running out of space. /Tmp had ample of space. Therefore, I decided to reduct /tmp and extend /opt volume. Following are the steps that…
Exchange 2013 – update CU 10 to CU 15 failed at 16 of 17 Steps
Exchange 2013 - update CU 10 to CU 15 failed at 16 of 17 Steps failed with the following error: Error: The following error was generated when “$error.Clear(); $dependentAssemblyGeneratorExePath =…
Upgrading vCenter Appliance (vCSA) and ESXi 6.5 to 6.7
This article is for upgrading vCenter Appliance and ESXi 6.5 to 6.7 on internet disconnected environment. Login to https://my.wmware.com/ and download the following two files: VMware-VCSA-all-6.7.0-8546234.iso VMware-ESXi-6.7.0-8169922-depot.zip Always upgrade the…
Copying a file from host OS to Hyper-V VM
To easily copy a file which is not an ISO from host OS to Hyper-V VM, do the following: 1. Right-click on the virtual machine, and choose the Settings command from…
Exchange 2013 fails to deliver mail to a DL
I have an application server auto-generating reports and emailed to a distribution list with external users. Earlier, application server was relaying directly to the customer mail server, but it was…
Upgrading Exchange 2013 CU10 to CU20
My Exchange 2013 is running CU 10 which is unsupported build. I have started testing to bring up to the latest build. It has to go through a multi-step upgrade…
Install CA certificate for application in Red Hat
Create a directory under an app/site in Red Hat server /path/cert Download a root CA certificate and copy to the above folder. Check the certificate expiration openssl x509 -text -noout…
Domain Admin Accounts locked out of DCs after implementing GPO
While testing implementing RMF security controls vulnerability ID V-63877 - Deny log on locally user right on workstations to Enterprise Admins and Domain Admin group via GPO, I basically logged…
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