HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.
|
|
DTS: Installation Summary
The Data Transfer System (DTS) must be installed at each site that files
are to be transferred to and/or from. The DTS is composed of
Perl scripts and associated configuration files and requires the creation of
three user accounts of varying privilege. The DTS does not require root
access to run, however, you will need such access or the cooperation of
someone who has root access to set it up.
The following software must be installed:
OpenSSH (any SSH2 implementation with sftp will work)
Perl 5 (v 5.16 recommended) with the following modules:
- Env
- File (comes with Perl 5.8)
- Time::Hires (comes with Perl 5.8)
- MailTools
- IO (comes with Perl 5.6)
- MD5 and Digest::MD5
- Expect (at least 1.12)
- Net::SFTP::Foreign (unless using FTP with OTP)
- Net::FTP (unless using SFTP)
Note that Net::FTP is not needed for the recommended configuration
using SFTP.
The following accounts must be created, each belonging to a common group
called dts:
DTS operator (dtsops) - A standard user account to run the DTS from
- The mailbox for this account receives all error messages from the
DTS, so the operator is notified when problems occur.
- Unpack the DTS package in the dtsops home directory
- Create a log directory (e.g. ~dtsops/log) with subdirectories,
in and out, for storing the logs of incoming and outgoing transfers.
Set DTS_IN and DTS_OUT in the dts.config file to their respective locations.
- Create a staging area with subdirectories, in and out.
Set DTS_STG and DTS_FTP in the dts.config file to their respective
locations. The DTS_FTP directory should have dtsops as its owner and
dts as its group with the following permissions: drwxrwsr-x (i.e. chmod
775, chmod g+s). The DTS_STG directory only requires that dtsops be
able to write to it.
- Choose a name that other DTS sites will refer to this DTS as,
preferrably short and all-caps. Set it as MYSITE in the dts.config file.
- Set OPSEMAIL in the dts.config file to dtsops@machinename, replacing
"machinename" with the full hostname.
- Edit SITELIST and SCRIPTS to contain the path to the installed
dts.sitelist and dts.scripts files (included with the DTS package).
The dts.sitelist file should only be readable by the dtsops user.
- Define an environmental variable, DTS_CONFIG, in your shell startup
(e.g. ~/.tcshrc), setting it to the location of the dts.config file.
DTS ftp (dtsftp) - A limited account which allows ftp/sftp transfers
- The home directory for this account should be the path set as
DTS_FTP.
- The shell for the account should be /noshell if FTP is the protocol
being used, or the location of the sftp-server executable if sftp is
being used (e.g. /usr/libexec/openssh/sftp-server). No one will be able
to log in to a shell on this account.
- chroot the account such that the home directory is the top level.
Note: As of DTS 9.2.0 (Aug 2021), the need for a dtsmail account has been
discontinued.
|
