The ramblings of a computer geek
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, … Read 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 … Read 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 … Read 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 … Read 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 … Read 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 … Read 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 … Read 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 … Read 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, … Read more
I had an issue where my Google Chrome kept on signing me out of my profile every time I closed the browser. Now, there may be a few reasons for this, and you may even want this as a desired approach, but in my case I didn’t want it logging me out of the profile … Read more