e2e: provision cluster entirely through Terraform (#8748 )

Have Terraform run the target-specific `provision.sh`/`provision.ps1` script
rather than the test runner code which needs to be customized for each
distro. Use Terraform's detection of variable value changes so that we can
re-run the provisioning without having to re-install Nomad on those specific
hosts that need it changed.

Allow the configuration "profile" (well-known directory) to be set by a
Terraform variable. The default configurations are installed during Packer
build time, and symlinked into the live configuration directory by the
provision script. Detect changes in the file contents so that we only upload
custom configuration files that have changed between Terraform runs

2020-09-18 11:27:24 -04:00

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End to End Tests

This package contains integration tests. Unlike tests alongside Nomad code, these tests expect there to already be a functional Nomad cluster accessible (either on localhost or via the NOMAD_ADDR env var).

See framework/doc.go for how to write tests.

The NOMAD_E2E=1 environment variable must be set for these tests to run.

Provisioning Test Infrastructure on AWS

The terraform/ folder has provisioning code to spin up a Nomad cluster on AWS. You'll need both Terraform and AWS credentials to setup AWS instances on which e2e tests will run. See the README for details. The number of servers and clients is configurable, as is the specific build of Nomad to deploy and the configuration file for each client and server.

Provisioning Local Clusters

To run tests against a local cluster, you'll need to make sure the following environment variables are set:

NOMAD_ADDR should point to one of the Nomad servers
CONSUL_HTTP_ADDR should point to one of the Consul servers
NOMAD_E2E=1

TODO: the scripts in ./bin currently work only with Terraform, it would be nice for us to have a way to deploy Nomad to Vagrant or local clusters.

Running

After completing the provisioning step above, you can set the client environment for NOMAD_ADDR and run the tests as shown below:

# from the ./e2e/terraform directory, set your client environment
# if you haven't already
$(terraform output environment)

cd ..
go test -v .

If you want to run a specific suite, you can specify the -suite flag as shown below. Only the suite with a matching Framework.TestSuite.Component will be run, and all others will be skipped.

go test -v -suite=Consul .

If you want to run a specific test, you'll need to regex-escape some of the test's name so that the test runner doesn't skip over framework struct method names in the full name of the tests:

go test -v . -run 'TestE2E/Consul/\*consul\.ScriptChecksE2ETest/TestGroup'
                              ^       ^             ^               ^
                              |       |             |               |
                          Component   |             |           Test func
                                      |             |
                                  Go Package      Struct

I Want To...

...SSH Into One Of The Test Machines

You can use the Terraform output to find the IP address. The keys will in the ./terraform/keys/ directory.

ssh -i keys/nomad-e2e-*.pem ubuntu@${EC2_IP_ADDR}

Run terraform output for IP addresses and details.

...Deploy a Cluster of Mixed Nomad Versions

The variables.tf file describes the nomad_sha, nomad_version, and nomad_local_binary variable that can be used for most circumstances. But if you want to deploy mixed Nomad versions, you can provide a list of versions in your terraform.tfvars file.

For example, if you want to provision 3 servers all using Nomad 0.12.1, and 2 Linux clients using 0.12.1 and 0.12.2, you can use the following variables:

# will be used for servers
nomad_version = "0.12.1"

# will override the nomad_version for Linux clients
nomad_version_client_linux = [
    "0.12.1",
    "0.12.2"
]

...Deploy Custom Configuration Files

Set the profile field to "custom" and put the configuration files in ./terraform/config/custom/ as described in the README.

...Deploy More Than 4 Linux Clients

Use the "custom" profile as described above.

...Change the Nomad Version After Provisioning

You can update the nomad_sha or nomad_version variables, or simply rebuild the binary you have at the nomad_local_binary path so that Terraform picks up the changes. Then run terraform plan/terraform apply again. This will update Nomad in place, making the minimum amount of changes necessary.

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