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This is a set of console utilities that are available on all UMIACS supported machines. They are provided to support our Ceph Object Stores so our users may interact with them on the command line. In addition each Ceph Object Store in UMIACS has fully functional web application that allows access to your storage from any web browser.
of utilities to the .Object StoreUMIACS.
For UMIACS support machines these utilities are installed at <code>/opt/UMobj/bin</code> however they should already be available in your path.
To use any of these utilities you either have to pass in on the command line your access and secret keys or you need to set some appropriate environmental variables. You can obtain your access and secret keys (which are different from your username and password) by visiting the appropriate Ceph Object Store. The default store is https://obj.umiacs.umd.edu/UMobjstore/user.
exampleyou use the <></> ,
In that page will be your access and secret keys for that Ceph Object Store. You can then set for example in bash the following environment variables.
If you are not using the default Ceph Object Store you can tell the utilities to use an alternative server.
You can optionally use the < code> --access_key</ code>, < code> --secret_key</ code> and < code> --server</code> switches to the utilities.
To list the object store you can use the <b>lsobj</ b> command. If given without a argument it will list your buckets (this will only list buckets that you created).
You can then give it a bucket to list the contents within the bucket (if you were granted access to a bucket you didn't create you can also use it ). This will list all the keys in your bucket which can take a long time.
can the it ..
$ lsobj test
-rwx--- 2013-10-04T15:25:09.000Z 1.8 KB UMIACSCA.pem
-rwx--- 2013-10-04T15:25:24.000Z 311.4 KB cover.jpg
-rwx--- 2013-10-04T15:27:39.000Z 0.0 b foo/
-rwx--- 2013-10-04T15:27:40.000Z 0.0 b foo/bar
-rwx--- 2013-10-04T15:25:32.000Z 31.8 KB screenshot.jpg
-rwx--- 2013-10-04T15:26:48. 000Z 8. 3 KB thunderbird.xpm
TOTAL: 353. 3 KB 6 Files
In a object store there are only buckets and keys (key=value store). This means your traditional posix directory structure is somewhat faked out using the UNIX <b>/</b> character. Any key in the bucket ending in a / will be interpreted by the <code>lsobj</code> and website as a directory. You can list only sub directories with the <code>lsobj</ code> utility.
$ lsobj test: foo/
-rwx--- 2013-10-04T15:27:39. 000Z 0. 0 b foo/
-rwx--- 2013-10-04T15:27:40.000Z 0. 0 b foo/bar
TOTAL: 0. 0 b 2 Files
The UMobj suite of utilities provide command-line access to the UMIACS Object Store. UMobj is preinstalled on all UMIACS-supported Linux machines.
When to use UMobj
Use umobj if:
- you have a large number of files to upload (hundreds or thousands of files)
- you are uploading large files (files greater than 4GB in size)
We highly recommend setting a few environmental variables containing your credentials for
convenience. When logged into the Object Store web interface (see list above), you can
find these credentials on the user page. E.g. https://obj.umiacs.umd.edu/obj/user/
For example, if you use the bash shell, you can add something like the following to your
.bashrc or .bash_profile.
Or in tcsh you can do the following or add it into your .tcshrc.
setenv OBJ_ACCESS_KEY_ID "31sdfadDFAHFDN+344qOEIS"
setenv OBJ_SECRET_ACCESS_KEY "NDSMK3233adfahadflkkPDSH092DSJKDKDJKFDLSFLNK"
setenv OBJ_SERVER "obj.umiacs.umd.edu"
For an example of how to use UMobj, please see UMobj/Example.
For complete usage information, please see the GitLab page for umobj.