Errata for Terraform: Up & Running

The maximum number of tests run in parallel is limited by default to the value of CPUs available (the value of GOMAXPROCS), so running the example as-is: go test -v -timeout 30m on a system with a default GOMAXPROCS value of 1 (eg., a 1 CPU/1 core VM) will run the tests serially instead of in parallel. This can be fixed without changing the system's properties by either manually setting a GOMAXPROCS environment variable to something greater than 1: export GOMAXPROCS=2 or by adding the "-parallel" flag to "go test" with a value greater than 1: go test -v -timeout 30m -parallel 2 Serial test behavior on a multi-CPU system can be forced by setting GOMAXPROCS or the parallel flag explicitly to 1.

Note from the Author or Editor:
I've updated the book with a note about this

The initial alb_example_test.go and other tests generate a "not enough arguments" error, as the function signatures for all of http_helper.HttpGet* functions were changed in terratest v0.19.0 to include a pointer to a TLSConfig struct as the third parameter. Adding a reference to a new, empty TLSConfig struct in all of the http_helper.HttpGet* functions allows the tests to compile successfully. For example: http_helper.HttpGetWithRetry( t, url, &tls.Config{}, expectedStatus, expectedBody, maxRetries, timeBetweenRetries, ) "crypto/tls" also needs to be added to the import list accordingly.

Note from the Author or Editor:
I will fix this in master

The initial run of TestHelloWorldAppExample fails because the expected response body is: Hello, World However, the user-data.sh script in the hello-world-app module used up to now (and in the github source repo) is generating formatted output that doesn't match: <h1>Hello, World</h1> <p>DB address: mock-value-for-test</p> <p>DB port: 3306</p> To fix the problem, either the user-data.sh script can be modified to store only the server_text value in index.html, or the expectedBody value in the test can be changed to match in a variety of ways: serverText := "Hello, World" mysqlAddress := "mock-value-for-test" mysqlPort := 3306 ... expectedBody := fmt.Sprintf("<h1>%s</h1>\n<p>DB Address: %s</p>\n<p>DB Port: %d</p>", serverText, mysqlAddress, mysqlPort)

Note from the Author or Editor:
I will fix this in master.

In the section "Loops with for_each Expressions" of Chapter 5, a code snippet for the module "webserver_cluster" in which the new "custom_tags" section is added includes the statement: enable_autoscaling = true Running the subsequent "terraform apply" with this statement errors out as the variable is unexpected in the module definition at that point. "enable_autoscaling" is not actually defined until later in the chapter, in the section "Conditionals with the count Parameter." Commenting out or removing the "enable_autoscaling = true" line from the snippet allows "terraform apply" to run successfully.

Note from the Author or Editor:
I'll fix this in master

On Chapter 5: Below the sentence, "You can also use for expressions to output a map rather than a list using the following syntax:", It shows: # For looping over lists {for <ITEM> in <MAP> : <OUTPUT_KEY> => <OUTPUT_VALUE>} # For looping over maps {for <KEY>, <VALUE> in <MAP> : <OUTPUT_KEY> => <OUTPUT_VALUE>} -------------------------------------------- I believe, it is supposed to be: # For looping over lists [for <ITEM> in <MAP> : <OUTPUT_KEY> => <OUTPUT_VALUE>] # For looping over maps {for <KEY>, <VALUE> in <MAP> : <OUTPUT_KEY> => <OUTPUT_VALUE>} as [ ] is for list and { } is for map.

Note from the Author or Editor:
I'll fix this in master

resource "aws_lb_listener_rule" "asg" { listener_arn = aws_lb_listener.http.arn priority = 100 condition { field = "path-pattern" values = ["*"] } The above path-pattern is deprecated. Updated code: condition { path_pattern { values = ["*"] } }

Note from the Author or Editor:
I fixed this issue in the code in multiple places and pushed the fix to master branch (commit ID: ed7aac8).

The official documentation for Chef Provisioning is no longer available in https://docs.chef.io/provisioning.html as it was officially end-of-life according to https://github.com/chef-boneyard/chef-provisioning

Note from the Author or Editor:
This is correct. This link/mention will need to be removed.

If you run the plan command on the preceding code, you will see that Terraform wants to create three IAM users, each with a different name ("neo", "morpheus", "trinity"): should be: If you run the plan command on the preceding code, you will see that Terraform wants to create three IAM users, each with a different name ("neo.0", "neo.1", "neo.2"):

Note from the Author or Editor:
Replace: ("neo", "morpheus", "trinity"): With: ("neo.0", "neo.1", "neo.2"):

The updated Handlers class now handles the /web-service URL by calling a new method call web_service, which makes an HTTP GET should be The updated Handlers class now handles the /web-service URL by making an HTTP GET..."

Note from the Author or Editor:
Original sentence: "The updated Handlers class now handles the /web-service URL by calling a new method call web_service, which makes an HTTP GET to example.org and proxies the response." Needs to be updated to: "The updated Handlers class now handles the /web-service URL by making an HTTP GET to example.org and proxying the response."

bucketRegionForTesting := "YOUR_S3_BUCKET_FOR_TESTING" should be bucketRegionForTesting := "YOUR_S3_BUCKET_REGION_FOR_TESTING"

so that the only things that execute are terraform apply and the validations for the hello-world-app module: should be : so that the only things that execute are deploy app and the validations for the hello-world-app module:

Note from the Author or Editor:
Replace "terraform apply" with "deploy app"

The dependency graph has twice "aws_security_group.instance", where it should instead have "aws_instance.example" and "aws_security_group.instance". This is what I get when I copy/paste the DOT output from the book into Graphviz online.

Note from the Author or Editor:
Figure 2-7 does indeed have a mistake. There are two boxes that both say "aws_security_group.instance" whereas the top one of those boxes should actually say "aws_instance.example"

"one to tow weeks" Brikman, Yevgeniy. Terraform: Up & Running (Kindle Location 4231). O'Reilly Media. Kindle Edition.

Note from the Author or Editor:
Thanks for reporting! We'll get this typo fixed.