Hey for all of you hand-rolling a Kubernetes / Docker cluster, I thought I’d mention a bug with Centos 7.x that is still yet to be fixed. The error is: /proc/sys/net/bridge/bridge-nf-call-iptables: No such file or directory. The fix is simple. Just execute the following command (as root). $ modprobe -v br_netfilter Problem solved. If you…
Category: Tips and Tricks
Infrastructure as Code using AWS Cloudformation
Problem Statement My Application is very complicated and it currently takes a lot of coordination and time to deploy my application. Does that sound familiar? I think we’ve all lived that problem at least twice in our lives. Deploying applications is never as easy as just double-clicking on “Setup.exe”, although it should be. The Solution…
Encryption type Matters with Deep Packet Inspection – solved
I was helping a client yesterday set up a VPN tunnel only to have it constantly disconnected. The client was located outside of the country. For the sake of avoiding throttling and saving on CPU, we were using the Blowfish cipher and it kept on getting disconnected. I found this rather strange as I’ve never…
Update 2: Programming and Database Mistakes
The biggest mistake you can make to cause problems with performance as a developer is to use joins. Inner or Outer Joins take up a lot of CPU. The transaction queries also take over 1000% time to complete in many cases. If you have to join tables, you need to revisit your DB architecture. The…
The most common mistake in Applications and Databases in general
So many programmers make this mistake because they don’t seem to get it. It’s not your fault as a programmer / developer. It’s just that you’re not a DBA. You need to implement Connection pooling. It makes such a huge difference in the way your DB performance and app works it’s amazing. So here are…
Database Backed Web Applications Advice
Here’s the scenario. You’ve got a dedicated server running windows in a server farm (generic dedicated server provider). You have mysql + asp or php app running all on the same server. Raid 1 mirroring and 2 GB of ram. You have to have windows, because your application supports it. Sound Familiar? It’s a problem…
International Text solutions – A solution
The thing that kills me more than anything is the International Texting thing today. You get charged upwards of .50 to text international. So here’s the solution for all of you people out there. Skype. Just install skype and register your cell phone number to it. (requires validation, but worth it). When you need to…
VOIP Tunneling with SBO or OpenVPN?
There seems to be much talk these days of tunneling and Voice-Over-IP(VOIP) most of it for the singular purpose of keeping the communications secure or hidden from the nasty overlords of the Internet. There seems to be two camps in this and two main technologies. Session Bandwidth Optimization and OpenVPN. Both do similar things, but…
The Virtual Webtop – A different type of experience
The Term Webtop has been a long time, but has been a fledgeling technology that has failed to take off. The reality is the technology wasn’t ready. In my honest opinion, the original creators had the right idea, but they got the whole concept wrong. So here’s where I’ve come to think about it on…
What happened to “Human” in Humanity?
I really do need to ask this question. I appreciate my followers and yes, they’re a loyal bunch. I do need to EVERYBODY one question and everyone on the Internet. We all go about our lives. We see the homeless person at the exit ramp, on the sidewalk, etc. Granted a lot of them are…