The ramblings of a computer geek
Although you should be using a keypair for SSH authentication (and not exposing to the Internet), if you’re working with a throw-away or test instance you might just need password authentication to be enabled. Here’s how! Open the SSH configuration file. Set the line “PasswordAuthentication” to “yes”. Save and close. Restart the SSH daemon with: … Read more
A potential scenario is to have a single Terraform template repository where you need to manage AWS resources across a number of different AWS Accounts. However, because each AWS Account is the edge of its authentication and authorisation profile, there is a need to be able cross this boundary within your Terraform to be able … Read more
You can force a replacement of an AWS EC2 instance within Terraform by issuing the following command. The previous command “taint” has now been deprecated. Where your instance is called “My-Instance-1” within the Terraform template. When you run this the instance will be destroyed and replaced (as if it was the first time it was … Read more
We have a user which has somehow added a proxyAddress (an email address to their account) but they don’t have an Exchange Online mailbox, and seemingly never have. Microsoft says the following about it from this article: An example of the problem can be seen below, as you can see the object on the right has … Read more
AWS CloudFront allows you to front your application (be it on EC2 instances or REST API etc.) so you can provide high availability, caching and protection (with WAF) to the workload. When configuring your application, you don’t want the application to be directly accessible without using CloudFront, so therefore you need to add some restrictions, … Read more
Here’s a little oddity with AWS Route Tables within Terraform, if you want to remove all of the routes in a route table, you can’t just delete or comment them out, otherwise it treats them as if nothing has changed. See the below example, you comment/remove the routes, then in its place add a blank … Read more
Even after designing, deploying and supporting Microsoft Exchange servers for longer than I choose to remember, I stumbled across something I never knew before yesterday; and that was why something was named the way it was. In Exchange 2007, Microsoft decided to remove the concept of “Administrative Groups”, however they needed to retain administrative groups … Read more
During my learning of AWS and its deployment via Terraform, I came across an issue where my EC2 instances kept getting destroyed, even when no changes had been made to them. For example in the plan output: Notice the “# forces replacement” on the security_groups directive. Turns it it was quite a simple fix, although … Read more
So you created an Exchange Online User and Mailbox but you’re still in a hybrid configuration where you are managing Exchange mailboxes on-premise. What this means is that the on-premise Exchange Organisation has no idea that the user exists, it doesn’t appear in Exchange Admin Center and it also probably won’t appear in the GAL. … Read more
Today we had a bit of a stop and think moment with a delegated domain; it was a good thought experiment to walk though. So let’s say you have a sub-domain thing.example.com of the domain example.com. The thing.example.com has been delegated by the administrators of example.com to a 3rd party who will manage the namespace … Read more