Merge pull request #483 from vorburger/patch-1

clarify endpoints in crictl doc

docs/crictl.md

@@ -61,9 +61,15 @@ Subcommands includes:
 - `completion`:   Output bash shell completion code
 - `help, h`:      Shows a list of commands or help for one command
 
-crictl connects to Unix: `unix:///var/run/dockershim.sock` or Windows: `tcp://localhost:3735`  by default. For other runtimes, the endpoint can be set in three ways:
+crictl by default connects to Unix: `unix:///var/run/dockershim.sock` or Windows: `tcp://localhost:3735`.  For other runtimes, use:
 
-- By setting flags `--runtime-endpoint` and `--image-endpoint`
+* [containerd](https://containerd.io): `unix:///run/containerd/containerd.sock`
+* [cri-o](https://cri-o.io): `unix:///var/run/crio/crio.sock` 
+* [frakti](https://github.com/kubernetes/frakti): `unix:///var/run/frakti.sock`
+
+The endpoint can be set in three ways:
+
+- By setting flags `--runtime-endpoint` (`-r`) and `--image-endpoint` (`-i`)
 - By setting environment variables `CONTAINER_RUNTIME_ENDPOINT` and `IMAGE_SERVICE_ENDPOINT`
 - By setting the endpoint in the config file `--config=/etc/crictl.yaml`
 
@@ -86,8 +92,6 @@ debug: true
 
 ## Additional options
 
-- `--runtime-endpoint`, `-r`: CRI server runtime endpoint (default: Unix: `unix:///var/run/dockershim.sock` or Windows: `tcp://localhost:3735`). The default server is dockershim. If we want to debug other CRI server such as frakti, we can add flag `--runtime-endpoint=/var/run/frakti.sock`
-- `--image-endpoint`, `-i`: CRI server image endpoint, default same as runtime endpoint.
 - `--timeout`, `-t`: Timeout of connecting to server (default: 10s)
 - `--debug`, `-D`: Enable debug output
 - `--help`, `-h`: show help