Fuseki on CentOS

Fuseki docs

Installing Fuseki 4.x on CentOS 7.x

Based on https://github.com/NatLibFi/Skosmos/wiki/InstallTutorial - only a few additions

Upgrade Java

sudo yum install java-11-openjdk java-11-openjdk-devel
sudo alternatives --config java

Create directories

• leave the database dirs under their default (/var/lib/fuseki/databases)
• make all created directories owned by fuseki:fuseki
• symlink that directory to another location if necessary
• create /var/lib/fuseki/databases/temp, which is not referenced in config.ttl, for batch operations (tdbloader, textindexer) in parallel to a running Fuseki, and make it owned by the operating user
• locate text indexes in a text subdirectory beyond the dataset directory

Link systemd script (provided by fuseki dist)

cd /etc/systemd/system
sudo ln -s /opt/fuseki/fuseki.service .

or provide customized version (as of v4.6.1, necessary for adding the --tdb2 flag), e.g. in /usr/local/etc/systemd/system/

Custom logging

Logging to file needs /etc/rsyslog.d/fuseki.conf:

if $programname == 'fuseki' then /var/log/fuseki/stderrout.log
if $programname == 'fuseki' then stop

To activate:

sudo systemctl restart rsyslog

Not sure if the following works_

Leave /opt/fuseki/log4j2.properties untouched, and modify a copy of it in /etc/fuseki.

Add a line to /etc/systemd/system/fuseki.service:

Environment=LOGGING=-Dlog4j.configurationFile=/etc/fuseki/log4j2.properties

Install new minor version of Fuseki

• Extract apache-jena-fuseki-x.y.z.tar.gz to /opt
• Stop service (if running)
• Replace /opt/fuseki symlink
• Start fuseki sudo /opt/fuseki/fuseki start

Migrating datasets from Fuseki 2.x to 3.x

On old machine:

export DS=eurovoc; curl -H "Accept: application/n-quads" http://localhost:8080/fuseki/$DS/data \
  | gzip > ${DS}_mig.nq.gz

On new machine:

export DS=eurovoc; zcat /var/lib/fuseki/backups/${DS}_mig.nq.gz \
  | curl -X PUT -d@-  -H "Content-Type: application/n-quads" http://localhost:3030/$DS/data