This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
Hi Alex, re: > We are setting up a data feed for Noaa via the ldm MADIS network, we have > this installed > so far and an entry for allow all ldm.madis-data.noaa.gov in the ldmd.conf is > there > anything else we should be doing? The mistakes that new LDM users commonly make are: - not setting up LDM logging The LDM uses the system logging daemon (e.g., syslog, rsyslog), and this requires that the one step in the LDM build be run as 'root'. That step will enable setuid root privilege on two LDM applications, ldmd and hupsyslog. Another thing that will be done as 'root' during the configuration portion of the LDM build/install process is setup entries needed for LDM logging in the system logging daemon configuration file (e.g., /etc/syslog.conf, /etc/rsyslog.conf). We have seen instances where the system logging daemon needs to be restarted (stopped and then started) for the logging to work. The other thing that is typically overlooked is the need to change the SELINUX setting from 'enabled' to 'disabled' or 'permissive'. Changing the default 'enabled' state to 'disable' requires a reboot of the machine. Changing to 'permissive' mode can be accomplished as 'root' by running the 'setenforce' system utility. - making sure that the local firewall allows inbound traffic on port 388 Some installations have firewalls running on the local, LDM machine and in the security perimeter. All must be configured to allow inbound traffic on port 388. - best practice is that the local LDM queue be made large enough to hold an hour's worth of data This allows the site(s) requesting data to go down for up to an hour for things like maintenance and still not miss data. re: > I can’t find too much info on the web for this. The information above is contained in the LDM documentation on our website, but it is not as succinct as the short description above. re: > Thanks in advance! No worries. Cheers, Tom -- **************************************************************************** Unidata User Support UCAR Unidata Program (303) 497-8642 P.O. Box 3000 address@hidden Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata HomePage http://www.unidata.ucar.edu **************************************************************************** Ticket Details =================== Ticket ID: VVO-154186 Department: Support IDD Priority: Normal Status: Closed