Craig Finch's questions

I have a full GUI installation of Windows Server 2012r2 2012 with the DFS Management snap-in installed for Server Manager. I want to use the DFSR module for Powershell to monitor DFS replication. However, this module and its associated commands are not available in Powershell:

PS C:\Windows\system32> Import-Module DFSR
Import-Module : The specified module 'DFSR' was not loaded because no valid module file was found in any module directory.

Here are two snippets from the output of the Powershell command Get-WindowsFeature to show which DFS features are installed.

[X] File And Storage Services                           FileAndStorage-Services        Installed
[X] File and iSCSI Services                         File-Services                  Installed
    [X] File Server                                 FS-FileServer                  Installed
    [ ] BranchCache for Network Files               FS-BranchCache                 Available
    [ ] Data Deduplication                          FS-Data-Deduplication          Available
    [ ] DFS Namespaces                              FS-DFS-Namespace               Available
    [X] DFS Replication                             FS-DFS-Replication             Installed
    [ ] File Server Resource Manager                FS-Resource-Manager            Available
    [ ] File Server VSS Agent Service               FS-VSS-Agent                   Available
    [ ] iSCSI Target Server                         FS-iSCSITarget-Server          Available
    [ ] iSCSI Target Storage Provider (VDS and V... iSCSITarget-VSS-VDS            Available
    [ ] Server for NFS                              FS-NFS-Service                 Available
[X] Storage Services                                Storage-Services               Installed

...

[X] File Services Tools                         RSAT-File-Services             Installed
    [X] DFS Management Tools                    RSAT-DFS-Mgmt-Con              Installed
    [ ] File Server Resource Manager Tools      RSAT-FSRM-Mgmt                 Available
    [ ] Services for Network File System Man... RSAT-NFS-Admin                 Available
    [ ] Share and Storage Management Tool       RSAT-CoreFile-Mgmt             Available

How do I install and access the DFSR module in Powershell?

EDIT: I just discovered that the server is actually running Windows Server 2012, not 2012r2. That's why the built-in DFSR module is not available. Updating to WMF/Powershell 5.1 does not make the new DFSR module available. I have updated the title, question, and tags on this post accordingly. One workaround is to install a third-party DFSR module.

I have a virtualized CentOS 7 server that needs to mount multiple password-protected encrypted volumes. I cannot automatically map the devices on boot, because I don't have access to the console during the boot process to enter the decryption password. After I reboot the system, I have to manually run

cryptsetup luksOpen <device> <name>

to map each underlying block device to an encrypted device. That requires keeping notes on the UUID of each underlying block device and the name it maps to. Is there an easy way to automate this process? I can add the information to /etc/crypttab with the noauto keyword to prevent the devices from mounting on boot. However, I can't get cryptsetup to use the information from this file.

It would be great if there were a command like cryptsetup luksOpen <name> that would read /etc/crypttab to find the name of the underlying block device (similar to the way that you can can mount <mountpoint> if is defined in /etc/fstab).

Is there any way to get cryptsetup to read the mappings from /etc/crypttab?

I have a collection of Linux servers, each of which has a local hard drive with a /tmp directory. Occasionally, the /tmp directory on a server will fill up and cause errors. I want to automate the process of checking for free space on each local drive so that /tmp can be cleaned before it causes a problem. Is there an elegant, programmatic way to determine the amount of free space on a disk on Linux? I know the "classical" answer is to run

df -h

on each server (perhaps using a distributed shell tool such as dsh) and write a script to parse the output. Many such scripts can be found online. I am looking for a more elegant solution, such as a newer disk utility that returns structured data, or some information buried in the /proc filesystem.