Can’t unmount an NFS datastore from a ESXi host

PROBLEM As part of a storage replacement programme, we had migrated all our VMs off the NFS datastore. When attempting to unmount the datastore from the host(s) we where given this error: Call “HostDatastoreSystem.RemoveDatastore” for object “datastoreSystem-122544” on vCenter Server “vcenterFQDN” failed. An unknown error has occurred. Checking the /var/log/vmkernel.log on the host we saw […]

More...

Can’t unmount an NFS datastore from a ESXi host

PROBLEM As part of a storage replacement programme, we had migrated all our VMs off the NFS datastore. When attempting to unmount the datastore from the host(s) we where given this error: Call “HostDatastoreSystem.RemoveDatastore” for object “datastoreSystem-122544” on vCenter Server “vcenterFQDN” failed. An unknown error has occurred. Checking the /var/log/vmkernel.log on the host we saw […]

More...

NagiosXI check_ldap Error – Could not bind to the LDAP server

When attempting to use the check_ldap plugin, I found that unsecured LDAP lookups on port 389/TCP worked fine, but attempting a secure lookup on 636 or using TLS failed. Attempting a check_ldap check normally worked fine (i.e. to port 389), but attempting an LDAPS or LDAP TLS check failed with the following error: The check_ldap […]

More...

Running BT Analogue Telephone Line via Structured CAT5e Network Cabling (RJ45)

From time to time you need to run normal POTS telephone over structured cabling, the main issue is that in the UK the pin outs can be different from the rest of the world, so buying a BT plug to RJ45 cable doesn’t always work. Below is a diagram of the cabling pinouts required for […]

More...