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Merged
vsoch merged 3 commits into from
Jan 6, 2017
Merged

clarified user binding (hopefully) #48

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af77d53
clarified user binding
GodloveD Jan 6, 2017
24d5038
realized that some of my clarification was obfuscation and tried again
GodloveD Jan 6, 2017
1369989
modified the example for successful binding
GodloveD Jan 6, 2017
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2 changes: 1 addition & 1 deletion pages/docs/admin-docs/advanced-config.md
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Expand Up @@ -46,7 +46,7 @@ The syntax for this consists of a bind path source and an optional bind path des
### USER BIND CONTROL (boolean, default='yes')
In addition to the system bind points as specified within this configuration file, you may also allow users to define their own bind points inside the container. This feature is used via multiple command line arguments (e.g. `--bind`, `--scratch`, and `--home`) so disabling user bind control will also disable those command line options.

Singularity will automatically disable this feature if the host does not support the prctl option `PR_SET_NO_NEW_PRIVS`.
Singularity will automatically disable this feature if the host does not support the prctl option `PR_SET_NO_NEW_PRIVS`. In addition, `enable overlay` must be set to `yes` and the host system must support overlayFS (generally kernel versions 3.18 and later) for users to bind host directories to bind points that do not already exist in the container.


## Logging
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10 changes: 7 additions & 3 deletions pages/docs/user-docs/docs-bind-paths.md
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Expand Up @@ -38,12 +38,16 @@ The system administrator has the ability to define what bind points will be incl


#### User defined bind points
If the system administrator has enabled user control of binds (via `user bind control = yes` in `/etc/singularity/singularity.conf`), you will be able to request your own bind points within your container processes. The most typical example of this is the `--bind` option and here is an example binding `/tmp` to `/scratch` (which again does not exist within the container):
If the system administrator has enabled user control of binds (via `user bind control = yes` in `/etc/singularity/singularity.conf`), you will be able to request your own bind points within your container.

Further, if the administrator has enabled the use of file system overlay (via `enable overlay = yes` in `/etc/singularity/singularity.conf`), you can bind host system directories to directories that do not exist within the container. Singularity will dynamically create the necessary bind points in your container on demand. This feature may not be supported on older host systems.

Here's an example of using the `--bind` option and binding `/tmp` to `/scratch` (which may not already exist within the container if file system overlay is enabled):

```bash
$ singularity shell -B /tmp:/scratch /tmp/Centos7-ompi.img
WARNING: Skipping user bind, non existant bind point (directory) in container: '/scratch'
Singularity: Invoking an interactive shell within container...

Singularity.Centos7-ompi.img>
Singularity.Centos7-ompi.img> ls /scratch
ssh-7vywtVeOez systemd-private-cd84c81dda754fe4a7a593647d5a5765-ntpd.service-12nMO4
```