### About
The `taskworkfow.go` file contains code to pull and unpack a container image
using the `devmapper` snaphotter, create a container and execute a task using the
`firecracker-containerd` runtime.
### Building
After checking out the `firecracker-containerd` repo, you can build this
example using the `make examples` command.
### Running
For a basic workflow, without any networking setup, just run the executable
built with the command in the previous section as super user:
```bash
$ sudo /path/to/firecracker-containerd/examples/taskworkflow
```
For a workflow with networking setup for the container, create a tap device
for the VM by following [these instructions](https://github.com/firecracker-microvm/firecracker/blob/main/docs/network-setup.md).
This creates a tap device named `tap0`, in the local `172.16.0.1/24` subnet.
Since the example does not rely on a DHCP client running within the VM to
initialize the network interface, `gw` flag should be used to
specify the gateway value.
The following example sets:
* The IP address (CIDR) to `172.16.0.2/24`
* The gateway IP address to `172.16.0.1`
** NOTE: This example will not work if you're running more than 1 container
on a host at the same time **
Now, run the example by passing the `-ip` argument:
```bash
$ sudo /path/to/firecracker-containerd/examples/taskworkflow -ip 172.16.0.2/24 \
-gw 172.16.0.1
```
You should see output similar to this:
```
2019/02/11 21:02:48.813898 Creating contained client
2019/02/11 21:02:48.814324 Created contained client
2019/02/11 21:02:48.981848 Successfully pulled docker.io/library/nginx:latest image
2019/02/11 21:02:51.202941 Successfully created task: demo for the container
2019/02/11 21:02:51.202962 Completed waiting for the container task
2019/02/11 21:02:51.231901 Successfully started the container task
2019/02/11 21:02:54.232051 Executing http GET on 172.16.0.2
2019/02/11 21:02:54.233193 Response from [172.16.0.2]:
[
Welcome to nginx!
Welcome to nginx!
If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.
For online documentation and support please refer to
nginx.org.
Commercial support is available at
nginx.com.
Thank you for using nginx.
]
172.16.0.1 - - [11/Feb/2019:21:02:54 +0000] "GET / HTTP/1.1" 200 612 "-" "Go-http-client/1.1" "-"
```