The ramblings of a computer geek
If you are using the AWS Web Application Firewall (WAF) on your Application Load Balancer or other supported AWS entity, you probably don’t want any administrative interfaces of the web application presented directly to the Internet without some form of restriction; perhaps to a range of IPv4 addresses you want to restrict. Adding a rule … Read more
A Web Application Firewall (WAF), is a layer of protection you can add to your web application. Adding a WAF to an Application Load Balancer (ALB) is pretty straightforward. You need to create at least one WebACL, to which you configure some rules (that filter the traffic), you can then attach the WebACL to the … Read more
We’ve started to host websites on AWS, we want to monitor using NagiosXI, but we got some odd results when first attempting to. The web application has no “index.html” page, which is one cause of the 403 forbidden error. However we were getting the same thing even when specifying the correct path. It turns out … Read more
The Microsoft licensing agreements are made based on the number of processor cores (or sockets) that are in use by the physical or virtual hosts that make use of Microsoft software. The Microsoft licensing allows for a VMware ESXi host’s CPUs (or cores) to be licensed instead of the vCPU (virtual CPUs) of each virtual … Read more
Although my website has been running since around 2008, since July 2021 its had over 10,000 visitors in the past nearly 2 years, here’s to 20,000!
The AWS application load balancer is a key infrastructure component for providing access to your application to the Internet, or even for use within your VPC between components. In this example we’ll create a VPC, then within deploy 2 private and 2 public subnets, we’ll then attach an Internet Gateway, a NAT gateway (to allow … Read more
The array OS 5.1.x and later supports iSCSI Group Scoped Target (GST) on iSCSI arrays (this is new), previous to this it was using VST Volume Scoped Targeting. GST reduces the number of individual host connections you need to configure and manage, which saves you time and also ensures you don’t hit limitations in the … Read more
You can deploy an NFS server onto an Ubuntu Linux server to allow you to provide NFS exports to other machines on your network. The documentation below provides a very quick guide on how to do this. It assumes you have a Ubuntu Linux 22.04 LTS machine with some storage attached that you want to … Read more
We needed to install Ruby 2.7 instead of what normally comes with Ubuntu 20.04 LTS, if we installed a later than 2.7 Ruby version, the particular application (i.e. Staytus in this case) would barf. The nice people at BrightBox have created some packaged installs of Ruby at various versions.https://www.brightbox.com/docs/ruby/ubuntu/#adding-the-repositoryhttps://launchpad.net/~brightbox/+archive/ruby-ng (Latest version supported 20.04) We first … Read more
In certain situations the Exchange DAG witness can become a problem, this can occur during an upgrade or can happen if there is a network interruption. Although the DAG will continue to operate the witness is considered failed, which can cause odd behaviour in a failover scenario, as there is no quorum available for the … Read more