I am running two neo4j instance on one server but with different port. I changed port in neo4j.conf file, I am able to run it properly.
Now, when I execute the cypher query to create a node in the second instance from neo4j-shell, it is creating nodes in first instance.
I have not configured any database path. Assuming it will consider neo4j default database path i.e. data\databases\graph.db.
Please help me with my mistake.
I see a few option of neo4j-shell and It has -port. You can change it with used port or you review property such as path, file, config.
You should text ./neo4j-shell -help to see them.
Related
sorry to bother you. I am trying to set up an ecosystem for a graph database that is going to be used by an application.
I am going to use the gremlin-client container:
Gremlin-Console docker
Also i am going to use gremlin-server container:
Gremlin-Server container
And finally i want to use the neo4j container as the storage layer:
Neo4j container
I have read all the docker-files and i was able to connect the console with the server. But now i need to connect the gremlin server container to the neo4j container. I have several links on the web but i was not able to complete this task. It gives me an error of server failure when i tried to connect to neo4j through gremlin-server by running the gremlin-server.sh file .
I have downloaded the repository in order to change the docker-file to fit my needs. Does anyone has experience and knows the correct procedure on how to accomplish the connection between the neo4j container with the gremlin server container and making queries through the gremlin console container?
Please any help would be really appreciated.
Thanks in advance,
Juan Ignacio
Since you want to use Neo4j Server you're basically asking how to connect Gremlin Server to a Neo4j Server which was asked in this question. You must either:
Configure the Neo4j graph in Gremlin Server to use HA mode as described here
Configure the Neo4j graph in Gremlin Server to use the Bolt implementation found here
Once you have Gremlin Server connected to Neo4j Server you can then connect Gremlin Console to Gremlin Server through "remoting" discussed here.
In your comments below, you alluded to the fact that you really just want to use Gremlin Console with Neo4j. I brought up the options above because you referenced use of Docker containers and specifically Neo4j Server. Note that you can get going very quickly with Neo4j in embedded mode directly in the Gremlin Console which is discussed in detail here. In that case there is no need for Docker, Neo4j Server, etc.
If you must use Neo4j Server/Docker for some reason and connect to it from the Gremlin Console, then you will still go with one of the two options discussed above, either (1) HA Mode or (2) neo4j-gremlin-bolt but you would simply create those Graph instances in Gremlin Console. For HA mode, that would mean the Gremlin Console would effectively become a node in the Neo4j cluster and for neo4j-gremlin-bolt your Graph instance would just connect over the Bolt protocol.
I have imported my data to a new Neo4j database instead of the standard graph.db using import tool. I want to switch this database to web Neo4j. I used Neo4j docker image with /var/lib/neo4j volume. But I can't find my config file to change the active database, even after I mount conf directory specifically this file doesn't get generated.
How can I switch active Neo4j database in web client or neo4j shell?
Here is the command with which I created neo4j container:
docker run --publish=7474:7474 --publish=7687:7687 --volume=/var/lib/neo4j/import:/var/lib/neo4j/import --env=NEO4J_dbms_allow_upgrade='true' --env=NEO4J_dbms.security.allow_csv_import_from_file_urls='true' neo4j:latest
You cannot change the active database of a live Neo4J instance.
Enterprise edition does allow for some values to be changed without rebooting; the keys allowed to be changed this way are listed at the online documentation, but dbms.active_database is not one of them.
Instead, you have a few options.
You can mount a /conf directory
The conf directory can be filled with configuration files that will completely override the default ones. They are not generated by Neo4J, you must take an entire neo4j.conf file and place it in the directory which is then mounted to the container. You can change whatever values you need to in that file.
After the mapped directory is updated with the new file, you will need to bounce your image (or exec a bounce of neo4j from within the image).
You can set the active database with an environment variable
Similar to how you've passed in the other environment variables, you can pass in other configuration options. If your new database was called newgraph.db and it resided in the same directory as graph.db, you would need only to pass in --env=NEO4J_dbms_active__database=newgraph.db. If it resides in a different directory, give that directory with --env=NEO4J_dbms_directories_data=/path/to/new/data/dir.
As these are passed as environment variables, changing them requires starting a new Docker image.
You could also build your own image.
The final and perhaps most drastic option would be to create your own image that is based off of neo4j's image and has all of the changes that you need. Typically, this would not be required, but if you want to clean up your invocation of docker and not keep around any mapped configuration directories, this is the way to go. It would also ensure anybody who has your custom image needs no additional configuration; whether this is desirable is up to you and your deployment architecture.
One friend of mine and I are trying to develop a CorDapp for a financial use case, I can run the cordapp-tutorial and the demos, however they only run on localhost.
We would like to create two "real" nodes and I understood correctly we should build two Corda nodes, my pc as one node server and his pc as another node server, but how can we effectively connect over the internet? On slack I have been told to enable dev-mode, but how do you enable it?
We have a corda.jar and the nodea.conf, but the part I don't really understand from the documentation is:
"Each node server by default must have a node.conf file in the current working directory. After first execution of the node server there will be many other configuration and persistence files created in this workspace directory. The directory can be overridden by the --base-directory= command line argument."
What is intended as working directory?
I've read this documentation
: Corda Nodes
Thank to all, I think I will be asking a lot of question in the near future :D
In Corda 3.1, you can use the network bootstrapper to create a dev-mode network of nodes running on two separate machines as follows:
Create the nodes by following the instructions here (e.g. by using gradlew deployNodes)
Navigate to the folder where the nodes were created (e.g. build/nodes)
Open the node.conf file of each node and change the localhost part of its p2pAddress to the IP address of the machine where the node will be run (e.g. p2pAddress="10.18.0.166:10007")
After making these changes, we need to redistribute the updated nodeInfo files to each node, so that they have the updated IP addresses for each node. Use the network bootstrapper tool to automatically update the files and have them distributed to each node:
java -jar network-bootstrapper.jar kotlin-source/build/nodes
Move the node folders to their individual machines (e.g. using a USB key). It is important that none of the nodes - including the notary - end up on more than one machine. Each computer should also have a copy of runnodes and runnodes.bat.
For example, you may end up with the following layout:
Machine 1: Notary, PartyA, runnodes, runnodes.bat
Machine 2: PartyB, PartyC, runnodes, runnodes.bat
After starting each node, the nodes will be able to see one another and agree ledger updates among themselves
Warning
The bootstrapper must be run after the node.conf files have been modified, but before the nodes are distributed across machines. Otherwise, the nodes will not have the updated IP addresses for each node and will not be able to communicate.
Each of the nodes will have a node.conf file. To enable devMode add this line to the node.conf file.
devMode=true
I want to create a social network in django framework in Openshift then I need at least a graph db (like Neo4j)and a relational db (like Mysql). I had trouble in add Neo4j to my project because openshift has not any cartridge for it. then I decide to install it with DIY, but I don't understand the functionality of start and stop files in .openshift/action hooks.Then I doing the following steps to install neo4j on server:
1.ssh to my account:
ssh 1238716...#something-prolife.rhcloud.com
2.go in a folder that have permission to write (I go to app-root/repo/ and mkdir test in it) and download the neo4j package from here. and extract it to the test folder that I created before :
tar -xvzf neo4j-community-1.9.4-unix.tar.gz
3.and finally run the neo4j file and start it:
neo4j-community-1.9.4/bin/neo4j start
but I see these logs and can't run the neo4j:
process [3898]... waiting for server to be ready............ Failed
to start within 120 seconds.
Neo4j Server may have failed to start, please check the logs.
how can I run this database in openshift ? where I am wrong ? and where is the logs in please check the logs?
I've developed an openshift cartridge that fixes the permission issue in openshift. I had to change the class HostBoundSocketFactory and SimpleAppServer in neo4j just to bind without using the 0 port, but using an openshift available port.
You can check at: https://github.com/danielnatali/openshift-neo4j-cartridge
it's working for me.
I would also not place it in the app-root/repo but instead I would put it in app-root/data.
You also need to use the IP of the gear - I think the env. variable is something like OPENSHIFT_INTERAL_IP. 127.0.0.1 is not available for binding but I think the ports should be open.
There are 2 ways neo4j can run : embedded or standalone(exposed via a rest service).
Standalone is what you are trying to do. I think the right way to setup neo4j would be by writing a cartridge for openshift, and then add the cartridge to your gear. There has been some discussion about this, but it seems that nobody has taken the time to do this. Check https://www.openshift.com/forums/openshift/neo4j-cartridge. If you decide to write your own cartridge, i might assist. Here are the docs: https://www.openshift.com/developers/download-cartridges.
The other option is running in embedded mode, which i have used. You need to set up a Java EE application(because neo4j embedded mode libraries are available only with java), and put the neo4j libraries in your project. Then, you would expose some routes, check for parameters and run your neo4j queries inside the servlets.
I'm new to rabbitmq and by association new to erlang. I'm running into a problem where I cannot start rabbitmq as the 'home' location for the .erlang.cookie has been changed. I've run the command
init:get_argument(home).
which returns
{ok,[["H:\\"]]}
this is an issue, as this is a network drive I do not always have access to. I need to be able to change the 'home' directory to something local.
when I run
rabbitmqctl status
it gives me the following error:
{error_logger,{{2013,7,5},{14,47,10}},"Failed to create cookie file 'h:/.erlang.cookie': enoent",[]}
which again leads me to believe that there is an issue with the home argument. I need to be able to change this location to something local.
Versions:
Erlang R16B01 32 bit
RabbitMQ 3.1.3
Running on Win7
I have uninstalled and reinstalled multiple times hoping to resolve this. I am looking for a way to change the 'home' location in erlang so rabbitmq can properly start.
The solution I came up with was to not bother with the installed service. I used the rabbitmq-server.bat to start the service, SET HOMEDRIVE=C: at the start of the file. I'm planing to run this from a parent service so that I can install this on servers.
Final note to earlang and rabbitMQ developers; using pre-existing environment variables for you own purposes is just wrong. You should create your own, or better yet put this stuff in a configuration file. Telling people to talk to their system administrators to change the HOMEDRIVE and APPDATA variables is arrogant to say the least.
You need to set the correct values for variables $HOMEDRIVE and $HOMEPATH. These links should help:
Permanently Change Environment Variables in Windows
Overriding HOMEDRIVE and HOMEPATH as a Windows 7 user