The ramblings of a computer geek
Tailscale is a great little tool to allow you to setup your VPN between all sorts of devices and without the worry about issues like Firewalls or setting up VPN servers/concentrators. There’s loads of documentation on how to setup Tailscale, so I won’t repeat that here, but i’ll run through a quick example of something […]
More...
SNMP (Simple Network Management Protocol) is a protocol that can be used for monitoring and managing network connected devices. Personally I use it primarily for monitoring, it is a useful way to interrogate network connected devices for information about their status. For example querying to identify if a power supply has failed on a switch, […]
More...
NagiosXI has a REST API that can be used to add, edit and remove objects from the configuration. Full details of the configuration and use of this can be found on your installation at: http://nagiosserver.domain.com/nagiosxi/help/?xiwindow=api.php (or you can find it through the Advanced Configuration menu). Each user has an APIKey which can also be found via […]
More...A quick guide to setting up SSH Public Key Authentication. SSH Public Key Authentication means you can authenticate to a remove server via SSH without needing to enter your username and password. Instead you create a public-private key pair, then place the public key on the target server. Then when you SSH to the server […]
More...
We have a number of 2 node DAGs which provide our Microsoft Exchange 2016 service. Being a 2 node DAG a file share witness server is in place. We had a datacentre event that took out one of the nodes and the witness server, rendering the one of the DAGs unhealthy and a second in […]
More...We run a number of Microsoft Exchange 2016 server (yes I know we need to upgrade), these consist of four, two node DAGs with a pair of shared witness servers. For the purposes of this explanation however, we have a two node Microsoft Exchange 2016 DAG, with a single DAG Witness Server (File Share). Situation […]
More...Finding the connected clients to a Dell PowerScale storage cluster is fairly straightforward, however you should be aware that it only shows clients that have active IO (input-output) operations in flight at the time you run the command. You can still have clients connected, but are idling, so are invisible. You can also specify a […]
More...If and when a log disk begins to fill up you will see messages such as “Log Disk Exhaustion on <vcenter name>”. Within the vCenter console and VAMI you can see the log drive is running low on space. If you are using VMware HA for vCenter, i.e. two vCenter appliances, you will need to […]
More...
The “Screen” command is a very useful utility that allows you to create a session (or sessions) which you can run programs in, but in such a way that you can detach from the session (screen) if you needed to logoff your terminal or reboot your client machine, but without loosing what you were doing […]
More...
Containerisation is an increasingly popular method to deploy and run applications on both your computer but also for enterprise applications. Containerisation essentially bundles an application’s code with all the files and libraries it needs to run. Having a layer of abstraction like this means that as long as you are running the same Operating System, […]
More...