WEBVTT

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In this lecture,

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we will learn

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how to update and destroy

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infrastructure using Terraform.

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In the previous lecture,

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we saw how to create a local file.

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Now

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let us see how we can update

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and destroy this resource

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using Terraform.

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First,

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let us try to update this resource.

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Let us add in a file permission argument

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to update the permission of the file

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to 0700

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instead of the default value of 0777.

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This will remove any permission

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for everyone else except the owner of the file.

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Now,

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if we're on Terraform plan,

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we will see an output like this.

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From the output,

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we can see that the resource will be replaced.

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The minus plus symbol

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in the beginning of the resource name

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in the plan

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implies that it will be deleted

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and then recreated.

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The line with the command that reads "forces replacement"

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is responsible for the deletion and recreation.

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In this example,

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this is caused by the file permission argument

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that we added to the configuration file.

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Even though the change we made was trivial,

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Terraform will delete the old file

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and then create a new file

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with the updated permissions.

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This type of infrastructure is called

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an immutable infrastructure.

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We saw this briefly

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when we discussed the different types of IAC tools.

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If you want to go ahead with the change,

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use the Terraform apply command

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and then type "yes" when prompted.

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Upon confirmation,

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the existing file is deleted

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and recreated with the new permissions.

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To delete the infrastructure completely,

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run the Terraform destroy command.

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This command shows the execution plan as well,

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and you can see the resource

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and all of its arguments

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have a minus symbol next to them.

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This indicates that the resource will be destroyed.

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To go ahead with the destroy

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confirm "yes" in the prompt.

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This will delete all the resources in the current configuration directory.

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In this example,

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it deletes the file/route/pets.ext.

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That's it for this lecture.

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Let's head over to the hands-on labs

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and practice updating

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and deleting infrastructure resources using Terraform.