Unit testing and code quality¶
make test command.
QEMU and Kubernetes¶
E2E testing relies on a cluster running inside multiple QEMU virtual machines deployed by GoVM. The same cluster can also be used interactively when real hardware is not available.
E2E testing is known to work on a Linux development host system. The user must be allowed to use Docker.
KVM must be enabled. Usually this is the case when
The current user does not need the privileges to use KVM and QEMU
doesn’t have to be installed because GoVM will run QEMU inside a
container with root privileges.
Note that cloud providers often don’t offer KVM support on their regular machines. Search for “nested virtualization” for your provider to determine whether and how it supports KVM.
Nested virtualization is also needed when using Kata Containers inside
the cluster. On Intel-based machines it can be enabled by loading the
kvm_intel module with
this time, Kata Containers up to and including 1.9.1 is not
volumes are not passed in as PMEM, but Kata Containers can be
and used for applications that are not using PMEM.
PMEM-CSI images must have been created and published in some Docker registry, as described earlier in build PMEM-CSI. In addition, that registry must be accessible from inside the cluster. That works for the default (a local registry in the build host) but may require setting additional configuration options for other scenarios.
Starting and stopping a test cluster¶
make start will bring up a Kubernetes test cluster inside four QEMU
The first node is the Kubernetes master without
The other three nodes are worker nodes with one emulated 32GB NVDIMM each.
After the cluster has been formed,
make start adds
to the worker nodes and deploys the PMEM-CSI driver.
make start completes, the cluster is ready for interactive use via
kubectl inside the virtual machine. Alternatively, you can also
KUBECONFIG as shown at the end of the
make start output
kubectl binary on the host running VMs.
make stop to stop and remove the virtual machines.
make restart can be used to cleanly reboot all virtual
machines. This is useful during development after a
to ensure that the cluster runs those rebuilt images. However, for
that to work the image pull policy has to be changed from the default
“if not present” to “always” by setting the
environment variable to
Running commands on test cluster nodes over ssh¶
make start generates ssh wrapper scripts
_work/pmem-govm/ssh.N for each
test cluster node which are handy for running a single command or to
start an interactive shell. Examples:
_work/pmem-govm/ssh.0 kubectl get pods runs a kubectl command on
the master node.
_work/pmem-govm/ssh.1 starts a shell on the first worker node.
Deploying PMEM-CSI on a test cluster¶
Several aspects of the cluster and build setup can be configured by overriding
the settings in the test-config.sh file. See
that file for a description of all options. Options can be set as
environment variables of
make start on a case-by-case basis or
permanently by creating a file like
Multiple different clusters can be brought up in parallel by changing
pmem-govm cluster name via the
CLUSTER env variable.
For example, this invocation sets up a cluster using an older release of Kubernetes:
TEST_KUBERNETES_VERSION=1.17 CLUSTER=kubernetes-1.17 make start
See additional details in test/test-config.d.
Running E2E tests¶
When ginkgo is installed, then it can be used to run individual tests and to control additional aspects of the test run. For example, to run just the E2E provisioning test (create PVC, write data in one pod, read it in another) in verbose mode:
$ KUBECONFIG=$(pwd)/_work/pmem-govm/kube.config REPO_ROOT=$(pwd) ginkgo -v -focus=pmem-csi.*should.provision.storage.with.defaults ./test/e2e/ Nov 26 11:21:28.805: INFO: The --provider flag is not set. Treating as a conformance test. Some tests may not be run. Running Suite: PMEM E2E suite ============================= Random Seed: 1543227683 - Will randomize all specs Will run 1 of 61 specs Nov 26 11:21:28.812: INFO: checking config Nov 26 11:21:28.812: INFO: >>> kubeConfig: /nvme/gopath/src/github.com/intel/pmem-csi/_work/pmem-govm/kube.config Nov 26 11:21:28.817: INFO: Waiting up to 30m0s for all (but 0) nodes to be schedulable ... Ran 1 of 61 Specs in 58.465 seconds SUCCESS! -- 1 Passed | 0 Failed | 0 Pending | 60 Skipped PASS Ginkgo ran 1 suite in 1m3.850672246s Test Suite Passed
It is also possible to run just the sanity tests until one of them fails:
$ REPO_ROOT=`pwd` ginkgo '-focus=sanity' -failFast ./test/e2e/ ...