|By Don MacVittie||
|February 4, 2016 01:15 PM EST||
In the currently high-flying world of DevOps, automation is the king. We are "automating all of the things" at a pretty astounding rate, and it is increasing productivity by reducing the man-hours invested in repetitive work. All very cool, but there is a dark side to automation, and that's control. While automating the entire datacenter is very cool, immature products sometimes lack the ability to let operators step in and approve changes before rolling them out.
Traditionally, the "review and approve" step is part and parcel of automation. New "just do it" tools are normally equipped with a review step to increase their appeal to datacenter teams during the verification and acceptance phase of rollout.
But DevOps got ahead of itself, and some vendors, wanting to move faster than competitors, started building their tools to take action by default, and not provide for that moment of human oversight. This probably works well for the majority of changes, but lacking that "brake", the train can get derailed. Outages in several large web providers that were cutting-edge DevOps shops certainly showed how that can happen. In one case I'm familiar with, the original error was a human error, but propagation happened so fast that before the human error could be fixed, thousands of customers were left with service interruptions, and cleaning up was slowed and even muddied by the automated systems re-propagating the misconfigurations.
So do we stop automating, and roll back DevOps? Absolutely not. But we should proceed with a bit of caution, and we should keep an eye on the ability of our tools to stop and let a human check things out. And of course, we need to make certain we have those check-points designed in, and there are responsible humans doing that checking.
The idea is simple - let the system do the work in an automated fashion, but keep operators in a position to give go/no-go decisions on the changes being made. That can be a range from "the system only does what it's told" - like the Stacki project, which I'm familiar with, that will install hundreds of machines at once, but install them the way humans (via spreadsheet normally, but also command line or automated tool) tell it to. Or via a "stop and review" step presented by a project like TerraForm by HashiCorp, which includes a "plan" step that allows operators to see exactly what steps will be taken to bring infrastructure to the desired state.
In the case of Stacki with spreadsheets, the desired configuration for hundreds or thousands of machines can be placed into the spreadsheet and reviewed by any number of people before it is applied. This offers teams the ability to make certain that major infrastructure build-outs or changes are solid and won't cause massive problems, while allowing automation to do all of the repetitive heavy lifting of configuring RAID and installing the operating systems. In the case of TerraForm, the "plan" step allows an experienced operator to quickly review what would be done and compare it to what they feel needs to be done before the changes are applied.
In both cases, automation is saving man-hours, but control remains in the hands of operations teams that need to insure the smooth execution of changes across the datacenter.
There are other tools (indeed, most tools have some capability, whether on by default or not) that allow for these and other types of checking, but the check-points need to be taken advantage of. Make certain staff is looking into the critical sections of automation and making certain that you are not merely increasing the velocity of destruction.
As most DevOps pros will tell you, planning ahead and including check-points in the process can help a lot both in protecting critical infrastructure and in easing the transition to an automated environment. Some projects will have corner cases and bugs that must be found, and check-points keep those problems from reaching production before they are fixed. In longer term projects, review only when the system has significant changes - or the system is introducing significant changes to the overall datacenter - is sufficient.
Automation and DevOps make systems overall more stable while also increasing agility (they're not mutually exclusive... A good automation system just requires good inputs to increase agility while maintaining uptime), so it just takes a little caution to make certain you're getting the most from the process. Some foresight in tool selection, and some more in the process determination, and you're set on a path that will save tons of man-hours without increasing overall risk to the organization. That's a good thing. Knowing what you want to check - just like knowing what you want to monitor - is the hard part, but some thought can bring you back with a list of high-risk activities that you need to check before pushing them out. Then add highly customized activities, like white-listing if including security in your DevOps environment, or configuring RAID controllers, and you've got your basic list of check-points.
Then go do cool stuff with all the free time it generates (after the initial investment, you don't get free time for free)... And keep kicking it.
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