.... Work in progress ....


To update this instance the following steps should be performed (as user solr): 


wget https://mirror.synyx.de/apache/lucene/solr/X.Y.Z/solr-X.Y.Z.tgz
or if older version:
wget https://archive.apache.org/dist/lucene/solr/X.Y.Z/solr-X.Y.Z.tgz 


wget https://downloads.apache.org/lucene/solr/X.Y.Z/solr-X.Y.Z.tgz.sha512
sha512sum solr-X.Y.Z.tgz


cd /data/ddb/tools/solr
tar -xvzf ~/solr-X.Y.Z.tgz


cd /data/ddb/tools/solr/solr-X.Y.Z/
cp dist/*.jar ./server/solr-webapp/webapp/WEB-INF/lib/
cp contrib/extraction/lib/*.jar ./server/solr-webapp/webapp/WEB-INF/lib/
cp contrib/analysis-extras/lucene-libs/*.jar ./server/solr-webapp/webapp/WEB-INF/lib/


cd ./server/solr-webapp/webapp/WEB-INF/lib/
ln -s /data/ddb/ddb-backend-solr/lib/ddb-backend-solr.jar
ln -s /data/ddb/ddb-backend-solr/lib/solr-ocrhighlighting.jar


service solr stop


cd /data/ddb/tools/solr
rm current
ln -s solr-X.Y.Z current


service solr start


Please check that the new Solr has startet without error by checking the web console: http://servername:8183/