Amazon Web Services

Amazon VPC Basics

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For the past five weeks, we have been getting deep in our Scalable Solutions series.  At Entasis we work with our customers to help them build solutions that are Scalable in design, Resilient by nature, with Performance on demand.  We feel that these three components are the pillars that all truly scalable solutions are built […]

Amazon Web Services

Amazon EC2 Security Groups

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In this installment of our Scalable Solutions series, we are going to be reviewing one of the core components of EC2, the security group.  We have found that our customers find that the elasticity provided by security groups allows them to build more resilient solutions and expand them as performance dictates it, with consistent security […]

Amazon Web Services

AWS Application Load Balancer

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This week in our Scalable Solutions series we are going to be covering the Elastic Load Balancer (specifically the Application Load Balancer or v2). At Entasis we help our customers build elastic and resilient solutions with performance on-demand.  If you need help finalizing your design or implementing your vision please don’t hesitate to reach out […]

Amazon Web Services

AWS Systems Manager Parameter Store

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At Entasis we help our customers understand and modify their technology stacks so that scaling is a function of cost not a function of technology.  However, when we look at scaling one of the largest problems is the consistency of an environment. When we are running 100 application nodes then the opportunity for one node […]

Amazon Web Services

AWS Certificate Manager

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Today we are going to take a look at another one of my favorite services.  AWS Certificate Manager. In this exploration we are going to be interacting with JSON which Powershell makes more difficult then it ought to.  So please keep in mind that if you are using the AWS CLI on bash or cygwin […]

Amazon Web Services

Amazon Route 53 Basics

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This post will kick off a series on Scalable Solutions.  Entasis uses a strong architectural emphasis in our AWS Solutions Group to deliver solutions that are Elastic by nature, Resilient in design, with Performance on demand.  These are the three pillars of Scalable Solutions. In this series, we will be going through some of the […]

Blog

Linux: Replace Disk in MD

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On my lab machines, I use a pair of physical disks, configured in a RAID 1 with MD, with LVM on top of that.  This gives me a lot of flexibility with full redundancy. However recently I had a failure of a drive. Identify the Failure Here is what MD was telling me after I […]

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Bash: Dynamic Volume Group Mounter

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This is similar, but an enhanced version of my custom_mount.sh previously published here: Bash: Automatically Mount File Systems on Volume Group if Present. This previous version was just a simple init script.  This updated version is designed for newer Linux distributions that use Systemd instead of Init. The Code The majority of the work is […]

Blog

Fedora 20: Use PPTP VPN

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I have had this one in the queue for a while (I don’t even run of Fedora 20 anymore).  This one will be short and sweet because there really isn’t a bunch of discussion that needs to go into it. By default Fedora 20 will block outbound PPTP VPN connections. # firewall-cmd –direct –add-rule ipv4 […]

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Zimbra 8.6: Bayesian Poisoning

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Let me start by saying that this problem is not unique to Zimbra and it certainly isn’t unique the version 8.6, however, I was using Zimbra 8.6 when I ran into this problem, so this is how I fixed it. What is Bayesian Poisoning? One of the core tenants of spam filtering using Bayesian probability […]