Neo4J 3.5.17 Migration

Recently I had to move data from Neo4J database running on an old linux box to another.

Neo4J is a Graph Database.

Graph database stores data in form of nodes and edges.

I'm using it for a side project Badam Satti. More details here

Take backup

 neo4j-admin dump --to=<path_for_file>

This created a file graph.db.dump

Install Neo4J on Ubuntu 20.4

Following steps are based on documentation. I tried installing Neo4J 4.4 but it was not able to read dump file from version 3.5.17 so decided to install older version.

apt-get update

• install java 8 required by Neo4J 3.5.17

apt install openjdk-8-jdk-headless

• check java compiler version

javac --version

• add Neo4J to apt sources

wget -O - https://debian.neo4j.com/neotechnology.gpg.key | sudo apt-key add -
echo 'deb https://debian.neo4j.com stable 3.5' | sudo tee -a /etc/apt/sources.list.d/neo4j.list

• update apt to get details for Neo4J

sudo apt-get update

• install Neo4J 3.5.17

sudo apt-get install neo4j=1:3.5.17

• Start Neo4J

systemctl start neo4j.service

• Check neo4j status and verify Bolt is started

systemctl status neo4j.service

• Also verify Neo4J is listening on port 7687 & 7474

lsof -i -P -n

• Check cypher-shell with user neo4j

cypher-shell -u neo4j

• Set password for 'neo4j'

systemctl stop neo4j.service
rm -f /var/lib/neo4j/data/dbms/auth
neo4j-admin set-initial-password <PASSWORD>

• Load dump

neo4j-admin load --from=<PATH_TO_DUMP> --force --database=graph

• Ensure that /var/lib/neo4j/data/databases/graph.db is owned by neo4j user. If not change ownership

chown -R neo4j:neo4j /var/lib/neo4j/data/databases/graph.db

• Again start Neo4J & verify Bolt is started

systemctl start neo4j.service
systemctl status neo4j.service

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