119 lines
4.6 KiB
Go
119 lines
4.6 KiB
Go
/*
|
|
|
|
Package integration implements an integration testing framework for kubernetes.
|
|
|
|
It provides components for standing up a kubernetes API, against which you can test a
|
|
kubernetes client, or other kubernetes components. The lifecycle of the components
|
|
needed to provide this API is managed by this framework.
|
|
|
|
Quickstart
|
|
|
|
If you want to test a kubernetes client against the latest kubernetes APIServer
|
|
and Etcd, you can use `./scripts/download-binaries.sh` to download APIServer
|
|
and Etcd binaries for your platform. Then add something like the following to
|
|
your tests:
|
|
|
|
cp := &integration.ControlPlane{}
|
|
cp.Start()
|
|
kubeCtl := cp.KubeCtl()
|
|
stdout, stderr, err := kubeCtl.Run("get", "pods")
|
|
// You can check on err, stdout & stderr and build up
|
|
// your tests
|
|
cp.Stop()
|
|
|
|
Components
|
|
|
|
Currently the framework provides the following components:
|
|
|
|
ControlPlane: The ControlPlane wraps Etcd & APIServer (see below) and wires
|
|
them together correctly. A ControlPlane can be stopped & started and can
|
|
provide the URL to connect to the API. The ControlPlane can also be asked for a
|
|
KubeCtl which is already correctly configured for this ControlPlane. The
|
|
ControlPlane is a good entry point for default setups.
|
|
|
|
Etcd: Manages an Etcd binary, which can be started, stopped and connected to.
|
|
By default Etcd will listen on a random port for http connections and will
|
|
create a temporary directory for its data. To configure it differently, see the
|
|
Etcd type documentation below.
|
|
|
|
APIServer: Manages an Kube-APIServer binary, which can be started, stopped and
|
|
connected to. By default APIServer will listen on a random port for http
|
|
connections and will create a temporary directory to store the (auto-generated)
|
|
certificates. To configure it differently, see the APIServer type
|
|
documentation below.
|
|
|
|
KubeCtl: Wraps around a `kubectl` binary and can `Run(...)` arbitrary commands
|
|
against a kubernetes control plane.
|
|
|
|
Binaries
|
|
|
|
Etcd, APIServer & KubeCtl use the same mechanism to determine which binaries to
|
|
use when they get started.
|
|
|
|
1. If the component is configured with a `Path` the framework tries to run that
|
|
binary.
|
|
For example:
|
|
|
|
myEtcd := &Etcd{
|
|
Path: "/some/other/etcd",
|
|
}
|
|
cp := &integration.ControlPlane{
|
|
Etcd: myEtcd,
|
|
}
|
|
cp.Start()
|
|
|
|
2. If the Path field on APIServer, Etcd or KubeCtl is left unset and an
|
|
environment variable named `TEST_ASSET_KUBE_APISERVER`, `TEST_ASSET_ETCD` or
|
|
`TEST_ASSET_KUBECTL` is set, its value is used as a path to the binary for the
|
|
APIServer, Etcd or KubeCtl.
|
|
|
|
3. If neither the `Path` field, nor the environment variable is set, the
|
|
framework tries to use the binaries `kube-apiserver`, `etcd` or `kubectl` in
|
|
the directory `${FRAMEWORK_DIR}/assets/bin/`.
|
|
|
|
For convenience this framework ships with
|
|
`${FRAMEWORK_DIR}/scripts/download-binaries.sh` which can be used to download
|
|
pre-compiled versions of the needed binaries and place them in the default
|
|
location (`${FRAMEWORK_DIR}/assets/bin/`).
|
|
|
|
Arguments for Etcd and APIServer
|
|
|
|
Those components will start without any configuration. However, if you want or
|
|
need to, you can override certain configuration -- one of which are the
|
|
arguments used when calling the binary.
|
|
|
|
When you choose to specify your own set of arguments, those won't be appended
|
|
to the default set of arguments, it is your responsibility to provide all the
|
|
arguments needed for the binary to start successfully.
|
|
|
|
However, the default arguments for APIServer and Etcd are exported as
|
|
`APIServerDefaultArgs` and `EtcdDefaultArgs` from this package. Treat those
|
|
variables as read-only constants. Internally we have a set of default
|
|
arguments for defaulting, the `APIServerDefaultArgs` and `EtcdDefaultArgs` are
|
|
just copies of those. So when you override them you loose access to the actual
|
|
internal default arguments, but your override won't affect the defaulting.
|
|
|
|
All arguments are interpreted as go templates. Those templates have access to
|
|
all exported fields of the `APIServer`/`Etcd` struct. It does not matter if
|
|
those fields where explicitly set up or if they were defaulted by calling the
|
|
`Start()` method, the template evaluation runs just before the binary is
|
|
executed and right after the defaulting of all the struct's fields has
|
|
happened.
|
|
|
|
// When you want to append additional arguments ...
|
|
etcd := &Etcd{
|
|
// Additional custom arguments will appended to the set of default
|
|
// arguments
|
|
Args: append(EtcdDefaultArgs, "--additional=arg"),
|
|
DataDir: "/my/special/data/dir",
|
|
}
|
|
|
|
// When you want to use a custom set of arguments ...
|
|
etcd := &Etcd{
|
|
// Only custom arguments will be passed to the binary
|
|
Args: []string{"--one=1", "--two=2", "--three=3"},
|
|
DataDir: "/my/special/data/dir",
|
|
}
|
|
|
|
*/
|
|
package integration
|