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‫Finally, we are going to talk about

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‫the conditions.

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‫So conditions are used to control the creation

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‫of resources, or outputs based on some statements.

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‫Logical statements.

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‫The conditions can be whatever you want them to be,

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00:00:11,632 --> 00:00:14,552
‫but the common ones are that, maybe you want to say,

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‫if you're in dev, or if you're in test,

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‫or if you're in prod create or don't create that resource.

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00:00:20,632 --> 00:00:22,051
‫Maybe it can be based on the region,

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‫maybe based on the parameter value.

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00:00:23,840 --> 00:00:26,579
‫Each condition can reference another condition,

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‫parameter value or mapping, so you can compose them.

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‫So to define them, to make it a little more concrete,

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‫here is a condition that I've created

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‫under the block conditions.

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‫Here we say, okay, do we want to create

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‫the production resources?

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00:00:41,542 --> 00:00:44,319
‫For this, you need to have the environment type,

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‫and that may be a parameter.

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‫This environment type right here.

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‫We need to have the reference,

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‫so the value of this paramater to be equal to prod,

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00:00:54,091 --> 00:00:56,339
‫P-R-O-D, the string prod.

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00:00:56,339 --> 00:00:59,980
‫So here, basically, this whole thing is going to be true,

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‫only if the environment is equal to prod.

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00:01:04,030 --> 00:01:08,251
‫Using this prod resources we are able to,

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00:01:08,251 --> 00:01:11,223
‫basically define and condition other resources.

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00:01:11,223 --> 00:01:13,561
‫It's up to you how you wanna chose it,

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00:01:13,561 --> 00:01:15,423
‫all the functions you can use in there are going to be

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00:01:15,423 --> 00:01:17,756
‫And, Equals, If, Not or, Or.

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00:01:18,667 --> 00:01:20,528
‫These are logical functions,

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00:01:20,528 --> 00:01:22,926
‫and you can compose them as much as you want.

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00:01:22,926 --> 00:01:24,567
‫Now how do we use a condition?

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00:01:24,567 --> 00:01:25,661
‫Well you can apply it, as I said,

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00:01:25,661 --> 00:01:27,828
‫to resources, outputs etc.

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00:01:28,751 --> 00:01:30,326
‫If we look at a resource, for example,

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00:01:30,326 --> 00:01:33,345
‫my MountPoint, the type of it is a

39
00:01:33,345 --> 00:01:36,145
‫AWS EC2 VolumeAttachment,

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00:01:36,145 --> 00:01:39,577
‫and this only gets created if the condition

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00:01:39,577 --> 00:01:43,415
‫CreateProdResources from before is true.

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00:01:43,415 --> 00:01:46,436
‫That gives you an idea of how conditions are used,

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00:01:46,436 --> 00:01:49,217
‫basically they're on the same level as the type,

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00:01:49,217 --> 00:01:52,756
‫right here underneath the name of the Resource.

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00:01:52,756 --> 00:01:54,126
‫So that's it for conditions,

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00:01:54,126 --> 00:01:55,697
‫I think they're pretty much advanced,

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00:01:55,697 --> 00:01:57,028
‫I'm not sure they're asked at the exam,

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00:01:57,028 --> 00:01:58,836
‫but for you it's still good to know about them,

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00:01:58,836 --> 00:02:00,446
‫that they exist, and you can have some

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00:02:00,446 --> 00:02:03,595
‫little bit more logic in your classroom mission templates.

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00:02:03,595 --> 00:02:04,596
‫I hope that was helpful,

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00:02:04,596 --> 00:02:06,575
‫and I will see you in the next lecture.