The ramblings of a computer geek
Let’s say you’ve identified a dependency that is needed on your machine, but you don’t know what package will provide the required file, you can use the “yum search <name> | grep <more granular name>” to narrow it down, but to see inside the package before install you can run the below, in my example […]
More...yum install hplip-gui hp-plugin hp-setup Follow the wizard through and setup the USB printer. https://www.centos.org/forums/viewtopic.php?t=62564
More...In a continued bid to build a desktop Linux machine, I was working on getting the three monitors working. One of the monitors uses the onboard graphics, the other two are plugged into a PCI-E riser card. The issue was that the monitor type is not detected by the onboard graphics, so reports the incorrect […]
More...Whilst building a new home machine I came across this issue where the third screen in my three screen setup was only seen as an “Unknown Display”. My machine has an on-board graphics card and a 2 port PCI-E riser graphics card, the monitors connected to the 2 port riser were working correctly, and the […]
More...If you need to SSH to a host but don’t have direct SSH access, you can perform a reverse SSH tunnel. For this you need a host that will except inbound connections to work as a “jump host”, it is possible without it, where you could SSH back to your client computer; however for the […]
More...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...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...When attempting to migrate a VM from VMware ESXi 5.5. to ESXi 6.0 U1 you may experience problems, this does not affect all VMs only some and they are typically VMs that have been backed up using an external backup tool and make use of CBT (Change Block Tracking). A bug within ESX 5.5 or […]
More...The Raspberry Pi lacks a real time clock, which means that the time can drift, so much so that NTP fails to update the software clock because its skewed so much. To resolve this you can do the following: Add this to /etc/ntp.conf: tinker panic 0 That will cause ntpd to sync despite the large […]
More...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 […]
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