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Devops Mastery
Brian Wagner, Jason Didonato
9 episodes
8 months ago
A lot of people new to automation are very nervous about letting a script or program like Chef change a production system. That fear can really slow the advance of a DevOps movement. But ignoring those people's fears is not the answer. So here are some tips and tricks to get everyone, including yourself, to be more confident about writing world changing scripts. Whenever possible create virtual environments. The use of virtual machines or cloud servers gives you considerably more options and abilities than bare metal hardware. Simply the ability to snapshot a server and revert back to it in minutes is a game changing concept. It let's you run any automation from beginning to end virtually without fear. I say virtually only because you occasionally run scripts that affect systems that cannot easily be virtualized. This is now more the exception than the rule. If you take a snapshot of the server, run the automation, find a mistake/error/bug you simply revert the server back to the starting point, fix the problem and try again. The only thing you have lost is the time it takes to run the script. This might be a lot of time but still less than having to rebuild the environment between each test run. If you have the luxury of multiple environments to use you can and should follow the same procedure used in the development of the script for future deployments. So you just take the script that worked in Dev and run it in Test after taking a snapshot there. Then rinse and repeat what you did all the way to production. Test it over and over and over again. It sounds crazy but I now run the completely new scripts I am ready to bless for migration to the next environment multiple times in each environment. This gives me the confidence that they really are working. I want to know I didn't do something weird that made the script work when I fixed the bug. Once the script runs cleanly multiple times I am all ready to go and I move it to the next tier. Ask someone to do a peer review of the script. This is just a good practice in general. When possible I suggest walking the person through the script and letting them ask questions the first time through. This has often turned up bugs and other issues all on it's own. Having to explain something uses a different part of your brain and opens your mind up to see the problems or possible problems. Ask someone else to run the scripts for you. I normally do this in a Dev/Test environment. I do this for two reasons 1) Validate my documentation 2) validate the procedure I am doing. Often my teammates have asked questions that point out things I forgot to account for or code in. They also tend to be less stressed than if they are deploying to a production environment. Doing this earlier is better. Repeating it when you have to make a change makes you a better programer/scripter. Your teammate finding that one thing that would have driven you nuts during a deploy is, in a word, priceless. Communicate what it is you are trying to automate. Be as specific as possible in the communications. Making everyone involved aware of what it is you are doing goes a long way towards building their trust. It is the most basic way to be inclusive in your process. Do your best not to make it sound like you are asking for permission to do the automation. You are doing this to make the environment better and no one should ever question that. This doesn't mean that you shouldn't be open to feedback. You should actually be ready for it because it will happen. While everyone in any given IT organization may not be expert communicators you need to take all feedback without feeling persecuted. Remember this is just as scary for them as it is for you at the beginning. So they may need time to adjust and gain confidence also. The worst thing you can do is start or continue a flame war about your automation process. Respond respectfully and with clarifications about thing
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A lot of people new to automation are very nervous about letting a script or program like Chef change a production system. That fear can really slow the advance of a DevOps movement. But ignoring those people's fears is not the answer. So here are some tips and tricks to get everyone, including yourself, to be more confident about writing world changing scripts. Whenever possible create virtual environments. The use of virtual machines or cloud servers gives you considerably more options and abilities than bare metal hardware. Simply the ability to snapshot a server and revert back to it in minutes is a game changing concept. It let's you run any automation from beginning to end virtually without fear. I say virtually only because you occasionally run scripts that affect systems that cannot easily be virtualized. This is now more the exception than the rule. If you take a snapshot of the server, run the automation, find a mistake/error/bug you simply revert the server back to the starting point, fix the problem and try again. The only thing you have lost is the time it takes to run the script. This might be a lot of time but still less than having to rebuild the environment between each test run. If you have the luxury of multiple environments to use you can and should follow the same procedure used in the development of the script for future deployments. So you just take the script that worked in Dev and run it in Test after taking a snapshot there. Then rinse and repeat what you did all the way to production. Test it over and over and over again. It sounds crazy but I now run the completely new scripts I am ready to bless for migration to the next environment multiple times in each environment. This gives me the confidence that they really are working. I want to know I didn't do something weird that made the script work when I fixed the bug. Once the script runs cleanly multiple times I am all ready to go and I move it to the next tier. Ask someone to do a peer review of the script. This is just a good practice in general. When possible I suggest walking the person through the script and letting them ask questions the first time through. This has often turned up bugs and other issues all on it's own. Having to explain something uses a different part of your brain and opens your mind up to see the problems or possible problems. Ask someone else to run the scripts for you. I normally do this in a Dev/Test environment. I do this for two reasons 1) Validate my documentation 2) validate the procedure I am doing. Often my teammates have asked questions that point out things I forgot to account for or code in. They also tend to be less stressed than if they are deploying to a production environment. Doing this earlier is better. Repeating it when you have to make a change makes you a better programer/scripter. Your teammate finding that one thing that would have driven you nuts during a deploy is, in a word, priceless. Communicate what it is you are trying to automate. Be as specific as possible in the communications. Making everyone involved aware of what it is you are doing goes a long way towards building their trust. It is the most basic way to be inclusive in your process. Do your best not to make it sound like you are asking for permission to do the automation. You are doing this to make the environment better and no one should ever question that. This doesn't mean that you shouldn't be open to feedback. You should actually be ready for it because it will happen. While everyone in any given IT organization may not be expert communicators you need to take all feedback without feeling persecuted. Remember this is just as scary for them as it is for you at the beginning. So they may need time to adjust and gain confidence also. The worst thing you can do is start or continue a flame war about your automation process. Respond respectfully and with clarifications about thing
Show more...
Technology
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Episode 21 - You did know there is a script for that?
Devops Mastery
19 minutes
11 years ago
Episode 21 - You did know there is a script for that?
Bob from Minneapolis sent us some great feedback and a couple of great questions. In this post we are going to tackle communicating what scripts are available and what they do. I spend a lot of my time as a consultant writing up documentation. At most sites I am pretty sure the work is lost before I get out the door on my last day. So how did I try to handle this before as a Tech Lead? To be completely honest it always seems to be hit or miss. I have never found a single solution that works for all purposes and with all types of people. Let's face it we as WetWare are the most difficult to communicate with. Hardware wants power and bits to process. Software wants data and other inputs. But humans, a.k.a WetWare, all want something different. There are all kinds of factors from Gender to skill level to happiness with their current job that can affect and require different types of communications. Since we can't solve all of these problems, and at least one is unsolvable, we need to focus on what we can. Let's start with the one thing I know doesn't work and that is network file shares. It's been my experience that network file shares full of Word or Text documents are where good documentation goes to die. There is no automatic version tracking, you can never find a structure everyone will agree on, and unless you ingest it into a database somehow it's basically unsearchable. Since no one can ever find the document they are looking for or be sure it's the most current it quickly becomes a thing we do because Management says we have to not because we find it at all useful. Wiki's can work well and solve at least a few of these issues but they still aren't a cure all. They tend to be search-able and track versions. They still have the structure issue though. If Google has taught us nothing it is that we don't have to care how things are stored in the great database that is the Internet as long as it can be searched we can find anything. With that being said the structure is probably less of an issue with a Wiki because they are generally speaking searchable. So it's always going to stay on my list. There are so many options from your own version of the Wikipedia to all javascript single page solutions. It's still not perfect but it works better than a file share and generally looks better too. Version Control systems like Git believe it or not when combined with something like gitlabs, gitblit, or github(public or private) can also work as a suitable solution. It keeps the documentation with the code and is search-able. Since the code and documentation are kept together it works a lot better for scripts and programs than it does for something like the procedure to shutdown your whole data center. It doesn't mean it can't or shouldn't use it just that it may not work great for all use cases. So again we are close but still not a home run. Knowledge-base/Content Management Systems/anything like it all work to varying degrees. This concept is really more implementation and software dependent. For the most part the difference between these and a Wiki is generally the flexibility to document changes to the documents and who made them. These systems tend to be very rigid and generally require defining a taxonomy to make them work efficiently. There is nothing wrong with defining a taxonomy but it normally provides very little reward for the time and frustration put into them to get everyone on the same page. They generally just become difficult to manage over time and then grow less useful as people stop putting the effort in. What seems to work in a lot of environments is a blending of the Wiki and Version Control(GIT) concepts. Yes your documentation ends up somewhat scattered but if everyone knows where to look for which kind of document then it works pretty well. I generally suggest putting things like procedure and policy items go in a Wiki so they are accessible to everyone. Then for things th
Devops Mastery
A lot of people new to automation are very nervous about letting a script or program like Chef change a production system. That fear can really slow the advance of a DevOps movement. But ignoring those people's fears is not the answer. So here are some tips and tricks to get everyone, including yourself, to be more confident about writing world changing scripts. Whenever possible create virtual environments. The use of virtual machines or cloud servers gives you considerably more options and abilities than bare metal hardware. Simply the ability to snapshot a server and revert back to it in minutes is a game changing concept. It let's you run any automation from beginning to end virtually without fear. I say virtually only because you occasionally run scripts that affect systems that cannot easily be virtualized. This is now more the exception than the rule. If you take a snapshot of the server, run the automation, find a mistake/error/bug you simply revert the server back to the starting point, fix the problem and try again. The only thing you have lost is the time it takes to run the script. This might be a lot of time but still less than having to rebuild the environment between each test run. If you have the luxury of multiple environments to use you can and should follow the same procedure used in the development of the script for future deployments. So you just take the script that worked in Dev and run it in Test after taking a snapshot there. Then rinse and repeat what you did all the way to production. Test it over and over and over again. It sounds crazy but I now run the completely new scripts I am ready to bless for migration to the next environment multiple times in each environment. This gives me the confidence that they really are working. I want to know I didn't do something weird that made the script work when I fixed the bug. Once the script runs cleanly multiple times I am all ready to go and I move it to the next tier. Ask someone to do a peer review of the script. This is just a good practice in general. When possible I suggest walking the person through the script and letting them ask questions the first time through. This has often turned up bugs and other issues all on it's own. Having to explain something uses a different part of your brain and opens your mind up to see the problems or possible problems. Ask someone else to run the scripts for you. I normally do this in a Dev/Test environment. I do this for two reasons 1) Validate my documentation 2) validate the procedure I am doing. Often my teammates have asked questions that point out things I forgot to account for or code in. They also tend to be less stressed than if they are deploying to a production environment. Doing this earlier is better. Repeating it when you have to make a change makes you a better programer/scripter. Your teammate finding that one thing that would have driven you nuts during a deploy is, in a word, priceless. Communicate what it is you are trying to automate. Be as specific as possible in the communications. Making everyone involved aware of what it is you are doing goes a long way towards building their trust. It is the most basic way to be inclusive in your process. Do your best not to make it sound like you are asking for permission to do the automation. You are doing this to make the environment better and no one should ever question that. This doesn't mean that you shouldn't be open to feedback. You should actually be ready for it because it will happen. While everyone in any given IT organization may not be expert communicators you need to take all feedback without feeling persecuted. Remember this is just as scary for them as it is for you at the beginning. So they may need time to adjust and gain confidence also. The worst thing you can do is start or continue a flame war about your automation process. Respond respectfully and with clarifications about thing