Add debugging section

content/en/docs/06/_index.md

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+---
+title: "6. Container interaction and debugging"
+weight: 6
+sectionnumber: 6
+---
+
+## Container interaction
+
+Sometimes things don't go as smoothly as expected.
+
+For such rare cases, Dagger gives us the possibility to start an interactive session to inspect a specific container:
+
+```bash
+dagger call backend --context=. terminal
+```
+
+This attaches us to `sh` shell inside the container returned by the `bakend` function.
+To exit press `ctrl-D` repeatedly.
+
+If you prefer another command, you can pass the optional `cmd` argument:
+
+```bash
+dagger call backend --context=. terminal --cmd=printenv
+```
+
+In this case it executes the command and terminates afterward.
+
+
+### Task {{% param sectionnumber %}}.1: Start a live terminal session
+
+Connect to the `frontend` container with a live terminal session using `bash` and list the installed debian packages.
+
+{{% details title="show solution" mode-switcher="normalexpertmode" %}}
+```bash
+dagger call frontend --context=frontend terminal --cmd=bash
+# dpkg -l
+```
+{{% /details %}}
+
+
+## Debugging
+
+In other cases, it would be helpful if we just could get a bit more detailed output.
+
+For this purpose, every Dagger command can be invoked with the `debug` flag:
+
+```bash
+dagger call --debug backend --context=.
+```
+
+
+
+