Update Hands-on.md

Singularity/Hands-on.md

@@ -121,6 +121,7 @@ $ singularity build --remote simple.sif simple.def
 * [ ] In **%files** section copy file we created outside of the container to the inside of it
 * [ ] Add **%environment** section and set some varables
 * [ ] Update the package lists and install **fortune** applications in **%post** section
+* [ ] Add **/usr/games** to **PATH** so we can access **fortune** directly
 * [ ] Make **/srv** writable for all users
 * [ ] Write **%runscript** that use previously installed application (use full paths)
 * [ ] Make **%test** script and ensure that applications are installed correctly
@@ -197,6 +198,22 @@ Template:
 singularity run myimage.sif | singularity run --app <appname> myimage.sif
 ```
 
+## Running an Instance
+
+* [ ] Run your image as an instance
+* [ ] List running instances
+* [ ] Shell into instance
+* [ ] Try stdin and stdout to the instance
+* [ ] Stop all instances
+
+```
+singularity instance start myimage.sif <instance name>
+singularity instance list
+singularity instance shell instance://<instance name>
+singularity run instance://<instance name> | singularity run --app <app name> instance://<instance name>
+singularity instance stop --all
+```
+
 ## Signing and Verifying Containers
 
 Singularity 3.0 introduces the abilities to create and manage PGP keys and use them to sign and verify containers. This provides a trusted method for Singularity users to share containers. It ensures a bit-for-bit reproduction of the original container as the author intended it.