Single Node Setup Instructions

Pre-requisites

1.  Ensure you have the syndeia-cloud-3.6_janusgraph_setup.zip (or latest service pack) downloaded to your home directory (or home directory's Downloads folder) from the download/license instructions sent out by our team.  

  Note: the .ZIP will pre-create a separate folder for its contents when extracted so there is no need to pre-create a separate folder for it.  

2.  Ensure you satisfy Janusgraph's pre-requisites, ie: have (Open|Oracle)JDK/JRE + Apache Cassandra (& optionally Elasticsearch) installed.  Re. CPU, memory, HD space, etc. this will depend on how much data you expect to store, query, and graph.  

3.  If using a firewall, and JG will be on a separate server from SC, ensure the following port is accessible (consult your local network admin if required): TCP port 8182 (this is the port to listen to for client connections).  

Downloading & Extracting JanusGraph

1. Ensure you have Janusgraph 0.5.3 (https://github.com/JanusGraph/janusgraph/releases/tag/v0.5.3) downloaded to your home directory (ie: wget https://github.com/JanusGraph/janusgraph/releases/download/v0.5.3/janusgraph-full-0.5.3.zip)

 Note: JG releases are now split into ones with and without ElasticSearch + Gremlin Server bundled.  The full releases contains ElasticSearch + the Gremlin Server.  

2. Unzip the JanusGraph package to /opt, ie:  sudo unzip janusgraph-0.5.3-full.zip -d /opt/

 Note: if you don't have unzip installed, you may need to first install it via yum install unzip

3. Unzip Syndeia Cloud's JanusGraph setup package in your home directory ~/, ie:  unzip syndeia-cloud-3.6_janusgraph_setup.zip -d ~/

4. Create a new user and group named janusgraph , ie:  sudo useradd --system --user-group janusgraph

5. Take ownership of the extracted folder, ie:  sudo chown -R janusgraph:janusgraph /opt/janusgraph-0.5.3-full

JanusGraph Keyspace Setup, Service Setup & Start:

6. In a new terminal session, cd into the bin dir and run the Syndeia Cloud JanusGraph setup script, ie:  cd ~/syndeia-cloud-3.6_janusgraph_setup/bin; ./syndeia-cloud-3.6_janusgraph_setup.bash. 

Managing JanusGraph:

7. To check the status of JanusGraph services, use systemctl status janusgraph.  You can verify that it started by verifying "Active: active (running)" shows up in the output: 

$ systemctl status janusgraph
● janusgraph.service
   Loaded: loaded (/etc/systemd/system/janusgraph.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2019-04-17 10:21:59 EDT; 7s ago
  Process: 22486 ExecStop=/bin/bash -c /opt/janusgraph-0.5.3-full/bin/janusgraph.sh stop (code=exited, status=0/SUCCESS)
 Main PID: 23677 (java)
   CGroup: /system.slice/janusgraph.service
           └─23677 java -server -Djanusgraph.logdir=/opt/janusgraph-0.5.3-full/bin/../log -Dlog4j.configuration=conf/gremlin-server/log4j-server.properties -Xms32m -Xmx512m -javaagent:

8. To stop/start the JanusGraph services, use sudo systemctl <action> janusgraph; where <action> = one of start|stop.  If the service successfully starts you should get the command prompt again. 

  Note: If you wish to ensure the services run on startup, run sudo systemctl enable janusgraph.  For more information on installing the .service files manually and configuring them to start after Cassandra, see Setting up Services to Start on Boot.  

9. To view the logs for JanusGraph, use sudo journalctl -eu janusgraph & less /opt/janusgraph-0.5.3-full/log/gremlin-server.log.  To follow the log files, you can use sudo journalctl -feu janusgraph & tail -f /opt/janusgraph-0.5.3-full/log/gremlin-server.log.  You should see output similar to the following (abridged) text:

 Note, for your convenience you may wish to create a symlink to /opt/janusgraph-0.5.3-full/log/ from /var/log, ie: sudo ln -nfs /opt/janusgraph-0.5.3-full/log/ /var/log/janusgraph

$ less /var/log/janusgraph/gremlin-server.log
[...]
2987 [main] INFO  com.datastax.driver.core.NettyUtil  - Found Netty's native epoll transport in the classpath, using it
4827 [main] INFO  com.datastax.driver.core.policies.DCAwareRoundRobinPolicy  - Using data-center name 'datacenter1' for DCAwareRoundRobinPolicy (if this is incorrect, please provide the correct datacenter name with DCAwareRoundRobinPolicy constructor)
4835 [main] INFO  com.datastax.driver.core.Cluster  - New Cassandra host janusgraph.domain.com/localhost:9042 added
9043 [main] INFO  org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration  - Set default timestamp provider MICRO
11325 [main] INFO  org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration  - Generated unique-instance-id=2d3877742385-janusgraph-domain-com1
11341 [main] INFO  com.datastax.driver.core.ClockFactory  - Using java.lang.System clock to generate timestamps.
11902 [main] INFO  com.datastax.driver.core.policies.DCAwareRoundRobinPolicy  - Using data-center name 'datacenter1' for DCAwareRoundRobinPolicy (if this is incorrect, please provide the correct datacenter name with DCAwareRoundRobinPolicy constructor)
11902 [main] INFO  com.datastax.driver.core.Cluster  - New Cassandra host janusgraph.domain.com/localhost:9042 added
12251 [main] INFO  org.janusgraph.diskstorage.Backend  - Initiated backend operations thread pool of size 8
27969 [main] INFO  org.janusgraph.diskstorage.Backend  - Configuring total store cache size: 208138508
33098 [main] INFO  org.janusgraph.diskstorage.log.kcvs.KCVSLog  - Loaded unidentified ReadMarker start time 2019-03-18T01:55:02.918Z into org.janusgraph.diskstorage.log.kcvs.KCVSLog$MessagePuller@28d6290
35668 [main] INFO  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - Initialized Gremlin thread pool.  Threads in pool named with pattern gremlin-*
36019 [main] INFO  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - Initialized GremlinExecutor and preparing GremlinScriptEngines instances.
40510 [main] INFO  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - Initialized gremlin-groovy GremlinScriptEngine and registered metrics
40532 [main] INFO  org.apache.tinkerpop.gremlin.server.op.OpLoader  - Adding the standard OpProcessor.
40540 [main] INFO  org.apache.tinkerpop.gremlin.server.op.OpLoader  - Adding the session OpProcessor.
41030 [main] INFO  org.apache.tinkerpop.gremlin.server.op.OpLoader  - Adding the traversal OpProcessor.
41076 [main] INFO  org.apache.tinkerpop.gremlin.server.op.traversal.TraversalOpProcessor  - Initialized cache for TraversalOpProcessor with size 1000 and expiration time of 600000 ms
41097 [main] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - idleConnectionTimeout was set to 0 which resolves to 0 seconds when configuring this value - this feature will be disabled
41098 [main] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - keepAliveInterval was set to 0 which resolves to 0 seconds when configuring this value - this feature will be disabled
41247 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v3.0+gryo with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0
41248 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v3.0+gryo-stringd with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0
41298 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v3.0+json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0
41299 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0
41306 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v1.0+gryo with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0
41311 [main] WARN  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - The org.apache.tinkerpop.gremlin.driver.ser.GryoLiteMessageSerializerV1d0 serialization class is deprecated.
41314 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v1.0+gryo-lite with org.apache.tinkerpop.gremlin.driver.ser.GryoLiteMessageSerializerV1d0
41315 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v1.0+gryo-stringd with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0
41325 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v2.0+json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV2d0
41347 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v1.0+json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV1d0
41350 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - application/json already has org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0 configured - it will not be replaced by org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0.
41437 [gremlin-server-boss-1] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Gremlin Server configured with worker thread pool of 1, gremlin pool of 4 and boss thread pool of 1.
41438 [gremlin-server-boss-1] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Channel started at port 8182.
181192 [metrics-logger-reporter-thread-1] INFO  org.apache.tinkerpop.gremlin.server.Settings$Slf4jReporterMetrics  - type=GAUGE, name=org.apache.tinkerpop.gremlin.server.GremlinServer.gremlin-groovy.sessionless.class-cache.average-load-penalty, value=2.450843818E9

10.  Validate correct operation and create/update an archive image to use as a new base image if the node needs to be rebuilt or if you wish to create a cluster. 

  Before making the image you may wish to first stop and optionally disable the service temporarily to prevent auto-start on boot, ie:  sudo systemctl disable janusgraph.  

Multi-Node (Cluster) Setup Instructions

Enabling your single-node deployment for cluster operation

11. If Cassandra will be on a separate server from JG, ensure you first enable Cassandra for cluster operation.   

12. Update the Janusgraph syndeia_cloud_graph configuration by running /opt/janusgraph-current/bin/gremlin.sh and running the following Groovy code ; where cassandra.mydomain.com = the FQDN of the Casandra server that you have now exposed :  

:remote connect tinkerpop.server conf/remote.yaml session
:remote console
map = new HashMap();
map.put('storage.backend', 'cql');  // should return: ==>null
map.put('storage.hostname', 'cassandra.mydomain.com');
ConfiguredGraphFactory.updateConfiguration('syndeia_cloud_graph', map);

13.  If Janusgraph will be on a different server than SC, please also:

13A.  Update the host: localhost entry on L1 in /opt/janusgraph-current/conf/gremlin-server/gremlin-server-configuration-syndeia.yaml, ex:  

host: jg-server.domain.tld
port: 8182

[...]

where jg-server.domain.tld = the FQDN of your JG server

13B.  Ensure port 8182 is accessible on the JG server. 

Adding new nodes to an existing single-node

14. Deploy another instance of your Janusgraph base image (which depending on your topology could be the same as your Cassandra base image).

15. Make any appropriate changes for the MAC address (ex: in the VM settings and/or udev, if used).

16. Setup forward & reverse DNS records on your DNS server (consult your IT admin/sysadmin if required) and set the hostname and primary DNS suffix on the machine itself (sudo hostnamectl set-hostname <new_JanusGraph_node_FQDN> where FQDN = Fully Qualified Domain Name, ex: janusgraph2.mycompany.com )

17. SSH to the IP (or the FQDN of the new node if DNS has already propagated).

Note: If using Fail2Ban, update the sender line in /etc/fail2ban/jail.local to root@<new_JanusGraph_node_FQDN>. Restart the fail2ban service (sudo systemctl restart fail2ban)

18. Three things need to occur:  you will need to change the Snitch (if not already done for Cassandra), alter the keyspace Replication Factor (RF), and run nodetool repair on each node (see https://docs.datastax.com/en/archived/cassandra/3.x/cassandra/operations/opsChangeKSStrategy.html for a summary of the process).

1. Change the Snitch:  see "Switching Snitches":  https://docs.datastax.com/en/archived/cassandra/3.x/cassandra/operations/opsChangeKSStrategy.html

2. Alter the RF:  verify the Cassandra “datacenter” name (default = dc1) from the CLI by running nodetool status and then from Cassandra CQLSH increment the RF for your JanusGraph keyspace(s):
   

   ALTER KEYSPACE syndeia_cloud_auth WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', '<datacenter_name>' : <total_number_of_nodes> };
   -- where <datacenter_name> = the name of the datacenter as shown via nodetool status, and <total_number_of_nodes> = total # of nodes (in the cluster)
   ALTER KEYSPACE syndeia_cloud_store WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', '<datacenter_name>' : <total_number_of_nodes> };
   -- where <datacenter_name> = the name of the datacenter as shown via nodetool status, and <total_number_of_nodes> = total # of nodes (in the cluster)
   ALTER KEYSPACE syndeia_cloud_confluence WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', '<datacenter_name>' : <total_number_of_nodes> };
   -- where <datacenter_name> = the name of the datacenter as shown via nodetool status, and <total_number_of_nodes> = total # of nodes (in the cluster)
   ALTER KEYSPACE syndeia_cloud_graph WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', '<datacenter_name>' : <total_number_of_nodes> };
   -- where <datacenter_name> = the name of the datacenter as shown via nodetool status, and <total_number_of_nodes> = total # of nodes (in the cluster)
   ALTER KEYSPACE syndeia_cloud_graph_config WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', '<datacenter_name>' : <total_number_of_nodes> };
   -- where <datacenter_name> = the name of the datacenter as shown via nodetool status, and <total_number_of_nodes> = total # of nodes (in the cluster)
   

3. Run nodetool repair:  Run nodetool repair --full <keyspace_name> on each node (for more details see https://docs.datastax.com/en/dse/5.1/cql/cql/cql_using/cqlUpdateKeyspaceRF.html)

19. Follow  "Things to Consider in a Multi-Node JanusGraph Cluster" https://docs.janusgraph.org/0.3.1/things-to-consider-in-a-multi-node-janusgraph-cluster.html

20. Repeat steps 14 ~ 19 for each additional cluster node.

 Note, this is a simplified view of adding nodes to a single-datacenter (DC) scenario.  As your data usage increase and your cluster grows, you may wish to consider more sophisticated multi-DC topologies.  For further information on this please consult the Cassandra documentation.  

Validating JanusGraph Operation for 1-node (or multiple nodes)

21. To validate JanusGraph operation, we start a Gremlin client and issue commands to check the edges and vertices in our graph  To do this, perform the following steps:  

21.1.  Open a new terminal window

21.2.  Go to the bin folder in JanusGraph installation and type the following command:  ./gremlin.sh.  You should see output similar to the below:    

$ ./gremlin.sh 

         \,,,/
         (o o)
-----oOOo-(3)-oOOo-----
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/janusgraph-0.5.3-full/lib/slf4j-log4j12-1.7.12.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/janusgraph-0.5.3-full/lib/logback-classic-1.1.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
plugin activated: janusgraph.imports
plugin activated: tinkerpop.server
plugin activated: tinkerpop.utilities
20:19:16 WARN  org.apache.hadoop.util.NativeCodeLoader  - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
plugin activated: tinkerpop.hadoop
plugin activated: tinkerpop.spark
plugin activated: tinkerpop.tinkergraph
gremlin> 

21.3.  Type the following commands, substituting your appropriate values as required:  

:remote connect tinkerpop.server conf/remote.yaml session
:remote console
graph = ConfiguredGraphFactory.open('syndeia_cloud_graph');
// should return: ==>standardjanusgraph[cql:[cassandra.mydomain.com]]
g = graph.traversal();
g.V();
g.E();

The last 2 commands above should not return any results since the graph (syndeia_cloud_graph) is empty - no vertices or edges.

21.4.  Type :quit