Enabling Alternate Version Of RADOS Striper

Owned by Ian Johnson
May 11, 2023
1 min read

Motivation

In order to test alternate implementations of service functionality, such as running a daemon with different libraries, it is useful to have a means of amending the LD_LIBRARY_PATH. We can specify this environment variable in a systemd "override" file; that is, a file in a certain directory containing additional settings.

For a service SERVICE, the directory to use is /etc/systemd/system/SERVICE.d. A file under this directory can contain additional settings using the unit file syntax, that is, stanza [SECTION] followed by settings relevant to that section (in this case, the [Service] section).

For the XRootD Ceph daemon, xrootd@ceph.service, the relevant directory is /etc/systemd/system/xrootd@ceph.service.d

On ceph-dev-gw3, this directory contains the file override.conf (the name is not important) with the following content:

[Service]
Environment="LD_LIBRARY_PATH=/usr/local/lib64:/usr/lib64"

This setting amends the value in the service's unit file (/usr/lib/systemd/system/xrootd@.service).