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High Availability (also known as HA) is the capability of a system to remain online regardless of the adversary events that might happen. Then, we will state that availability is the characteristic that concerns a service to be reachable when it is needed. And as you should guess, availability can be measured using percentages (from 0% to 100%); of course, we all know the more close to 100%, the more expensive it is to deploy a system like that. In the folklore when you say a service has 3 nines of availability, you mean 99.9%.,
As a security consultant and CISSP certified, I have not found any hard definition that states how many 9s you should have to claim you have high availability. In my experience, people start calling high availability when discussing 3 nines or better. But this is only a feeling.
When someone says in the cloud, it is a very gray term that means another's computer. When we speak about servers, we think about VPS in the cloud. A name such as Digital Ocean or Vultr jumps right away into my mind. If you are looking forward to having a non-expensive, reliable system in high availability with some load balancing, this article will help you to understand how this works.
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Today while doing a little support I had this strange issue: if a user dials out through a carrier, he/she will listen to the ringback tone right away; but if this same user calls to another extension he/she won't listen right away. Instead, you will have a variable dead air and then suddenly, the callee will answer.
Read more: Making FreeSWITCH (and FusionPBX) to send the Ringback Tone Right Away
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Now that I am working with some friends, I have been asked to teach them how to deal with the command line to do some basic troubleshooting. To accomplish this, I believe the first step is the understanding of the main elements of a FusionPBX server and how they interact with it. So here it is.
Please note that this article is agnostic for having a stand-alone server or a cluster deployment.
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FusionPBX has proven to be one of the best interfaces that exist for FreeSWITCH. But like any project, it is always subject to improvement.
We are looking for sponsors who want to support the inclusion of the following characteristics:
- Visual Editor for IVR: redesigning the application to allow a visual design to create IVRs. The idea of this add-on is to let people drop and drag elements by drawing a call flow chart.
- Yubikey authentication token in stand-alone mode: Users can enter into the Web interface of FusionPBX using the token. Yubikey has excellent support in browsers and servers with Linux.
- Authentication via PAM: Web users can enter the interface FusionPBX using PAM. This is very useful for authentication against different services, for example, use your password from your email server.
- Specific routes for Call Flows: Application Call Flow uses the default routes on the tenant sometimes you may require adding a label to allow discriminating certain routes.
- SMS for FusionPBX: like voice dial plans, SMS will let you build complex or simple chat flows. This application will let you use your SIP Client on your mobile, for example, and send/receive texts.
Depending on the size of the effort, some of these capabilities will be donated to the FusionPBX project once finished.
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In my last article, I described how I did to set up a Galera Cluster. The process works fine if you disable SELinux, however, more than one would like it on for security reasons.
Read more: Making SELinux work with a MariaDB Galera Cluster
