The ramblings of a computer geek
Very occasionally my Ohme Pro charger loses its connection to the Nissan LEAF API which it uses to determine the battery status, this doesn’t affect the charging of the car, but just means it reports incorrect information and grumbles to say the “car isn’t charging how we’d expect”, even though it is. Ohme customer car … Read more
Building upon the example Simple Terraform Docker Example (Ubuntu Linux), we’ll store our Terraform State in AWS S3 Bucket, rather than just locally on the machine running Docker. Yes, I know its not a very useful example, but it simply illustrates the mechanism and how it can be used for more useful and complex deployments. Storing … Read more
Attempting to play a multicast stream from Windows VLC Player, was seeing the IGMP Snooping picking up something from my machine, but not the join to the specific group (channel/stream) I was trying to view. I was attempting to get to a stream: udp://@239.4.6.0:1234 Resolution To resolve the problem, it turned out to be VirtualBox, … Read more
The Brocade SAN Switches have SNMP capability which can be used for configuration and monitoring. These instructions detail how to configure SNMP on the SAN switches to allow them to have their state be monitored via SNMP from a suitable monitoring platform (e.g. NagiosXI or Opsview etc.). We are not configuring SNMP Traps, this is … Read more
I’ve found that managing your time is the most important and most effective thing you can do in your day to maintain productivity. If you’re like me having endless unnecessary interruptions means you can’t get into “the zone” and have periods of deep concentration required to actually do useful work. Endless flipping from task to … Read more
We were conducting a data centre relocation which involved moving an HPE Nimble Storage array, changing the array name and group is straight forward enough, this can be done from the GUI within the “Hardware” section. However once changed clients still see the old group name which included the old name of the array. Resolving … Read more
Nagvis by default will show the header at the top of any NagVis maps, which is fine for when you’re editing, but perhaps you have screens that display maps for information within a OC, NOC or SOC, on the later versions of the NagVis rather than appending the URL with: you now need to use … Read more
To explore how DKIM validation works first got an email in .eml format as an example email which was a known good email where the DKIM validation is OK. Meaning that both the header and the body are unchanged from when the email was first DKIM signed. There is a little tool called “dkimpy”, which … Read more
Just like the testing of SMTP using Telnet, you can also perform the same steps if the target server is using TLS, however because telnet won’t do the job here, you can use OpenSSL instead. Here’s a simple example:
Although I’ve covered this before if you want to add some headers into a test email, this can be done by just adding the required header into the “DATA” section. In the example below I’m adding in a header called “List-Id”. You would telnet into your mail server then type in the following: