Recently installed Neo4J on a Raspberry Pi on a docker container (portainer). Everything seems to working fine. I can open a terminal in Portainer and run commands. I can see there are two DB and I can even run Cypher commands (cut and pasted the Movie entries). But I'm not able to run any commands using the browser. I seem to be able to connect the browser (http://localhost:7474/browser/) and see the ":play movie-graph" run. But when I try to run the query to enter movie data, I get the following error: "ERROR: Neo.DatabaseError.General.UnknownError" Running :sysinfo doesn't return any results. Also the cursor is $ as opposed to a DB name. And don't see any databases in the Database menu on the left.
Again, I'm able to run queries using Cypher Shell through a Portainer terminal.
Here are the container details:
IMAGE neo4j:latest#sha256:b91a4a85afb0cec9892522436bbbcb20f1d6d026c8c24cafcbcc4e27b5c8b68d
CMD neo4j
ENTRYPOINT tini -g -- /startup/docker-entrypoint.sh
ENV
JAVA_HOME /usr/local/openjdk-11
JAVA_VERSION 11.0.15
LANG C.UTF-8
NEO4J_AUTH none
NEO4J_dbms_connector_bolt_advertised__address localhost:7687
NEO4J_dbms_connector_http_advertised__address localhost:7474
NEO4J_dbms_connector_https_advertised__address localhost:7473
NEO4J_EDITION community
NEO4J_HOME /var/lib/neo4j
NEO4J_SHA256 34c8ce7edc2ab9f63a204f74f37621cac3427f12b0aef4c6ef47eaf4c2b90d66
NEO4J_TARBALL neo4j-community-4.4.8-unix.tar.gz
PATH /var/lib/neo4j/bin:/usr/local/openjdk-11/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
I'm sure it is something silly I'm missing, but reading multiple forum comments haven't help. Any help would be appreciated.
Thank you.
SJ
When you load the neo4jbrowser from your internet browser at:
http://localhost:7474/browser
, you need to connect to the bolt advertised address of your neo4j server at:
bolt://localhost:7687
Related
Q1. What versions are we using?
Ans.
Python 3.6.12
OS : CentOS 7 64-bit
DB : Oracle 18c
Django 2.2
cx_Oracle : 8.1.0
Q2. Describe the problem
Ans. While running server with "python3 manage.py runserver"
application is able to contact Oracle DB and show the Django Administration page and login also works.
But when we access the application using the Apache (HTTPD) based URL over secure SSL port, we do see the Django page and the admin page as well but Login to Admin page with Internal server error.
In the logs, we see
"django.db.utils.DatabaseError: Error while trying to retrieve text for error ORA-01804"
cx_oracle is otherwise able to connect to the database properly, another application is also using the same database behind the same httpd proxy and works fine
Q3. Show the directory listing where your Oracle Client libraries are installed (e.g. the Instant Client directory). Is it 64-bit or 32-bit?
Ans. 64-bit
Q4. Show what the PATH environment variable (on Windows) or LD_LIBRARY_PATH (on Linux) is set to?
LD_LIBRARY_PATH=/srv/vol/db/oracle/product/18.0.0/dbhome_1/lib:/lib:/usr/lib
PATH=$ORACLE_HOME/bin:/srv/vol/db/oracle/product/18.0.0/dbhome_1/lib:$PATH
Q5. Show any Oracle environment variables set (e.g. ORACLE_HOME, ORACLE_BASE).
ORACLE_HOME=/srv/vol/db/oracle/product/18.0.0/dbhome_1
TNS_ADMIN=$ORACLE_HOME/network/admin
NLS_LANG=AMERICAN_AMERICA.AL32UTF8
ORACLE_BASE=/srv/vol/db/oracle
CLASSPATH=$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib:$ORACLE_HOME/lib
Any suggestions/help is highly appreciated.
Thank you
I found the problem
So I just removed all the variable declarations from /etc/sysconfig/httpd and checked, the application was still able to access the lib files, so these were now redundant.
Then undid all variable declarations done earlier in .localsh and .localrc files for the os users. To start from scratch, and go step by step to see where it breaks.
So now, cx_Oracle was looking for the lib files in wrong directory
$ORACLE_HOME/client_1/lib
instead of
$ORACLE_HOME/lib
DPI-1047: Cannot locate a 64-bit Oracle Client library: "$ORACLE_HOME/client_1/lib/libclntsh.so: cannot open shared object file: No such file or directory". See https://cx-oracle.readthedocs.io/en/latest/user_guide/installation.html for help
I did not have any subfolder named "client_1" inside dbhome_1
so I just created a symlink client_1 that points to dbhome_1 (still unsure on this, but at least it works :) )
So, now, this error was gone but now again ORA-01804 was coming. 😑
I had read somewhere that this error can be fixed by adding "libociei.so" but I did not have one on my instance, so I generated it using these commands:-
mkdir -p $ORACLE_HOME/rdbms/install/instantclient/light
cd $ORACLE_HOME/rdbms/lib
make -f ins_rdbms.mk igenliboci
Then I just moved this libociei.so file from
$ORACLE_HOME/instantclient to $ORACLE_HOME/lib
Now there was a new error (so.. progress 😉 ):
ORA-12546 - TNS Permission Denied.
This was easy to solve 😀
I used this command to address this :-
setsebool -P httpd_can_network_connect on
And...... That was all! It worked.
I have a express server running inside a docker container. Once a user makes a REST call to an endpoint, it should make multiple in-memory screenshots of a randomly generated mesh from different angles using Babylon.js, do some image processing on it, create a PDF out of it and return the generated PDF file to the user.
To do so, I am trying to use headless-gl to provide virtual frame buffer for Babylon.js engine.
As far as I understood, I first need to get the gl context and then pass it to babylon engine:
var gl = require(‘gl’)(1024, 768, { preserveDrawingBuffer: true });
var engine = new BABYLON.Engine(gl, true, { disableWebGL2Support: true });
My issue is that I am not able to init the gl and it returns null.
Inside my Dockerfile, I use the following to install the dependencies for xvfb:
RUN apt-get update && apt-get install -y
libgl1-mesa-dri
libglapi-mesa
libosmesa6
mesa-utils
xvfb
&& apt-get clean
My server depends on mongo DB as well so inside my docker-compose.yml file, I wait for the DB container to get initialized before I load my express container:
command: wait-for.sh mongodb:27017 – …/node_modules/.bin/nodemon --inspect=0.0.0.0:9229 ./server.js
I think I need to updated my Dockerfile and docker-compose files with proper commands to load xvfb before running the node application but I am not sure how to do that.
I tried the following along with some other combinations but no luck so far:
command: wait-for.sh mongodb:27017 – xvfb-run -s “-ac -screen 0 1280x1024x24” node ./server.js
I appreciate if someone can help me resolve the issue.
I think you are missing the server number as an argument. I am using xvfb-run --auto-servernum <command> to automatically get a free one. The default is number 99.
You can also use Xvfb manually with the DISPLAY environment variable set to :99 (default server number), but xvfb-run makes live a lot easier. I think you already read this, but for future users I will quote the stackgl/headless-gl README:
Interacting with Xvfb requires you to start it on the background and to execute your node program with the DISPLAY environment variable set to whatever was configured when running Xvfb (the default being :99). If you want to do that reliably you'll have to start Xvfb from an init.d script at boot time, which is extra configuration burden. Fortunately there is a wrapper script shipped with Xvfb known as xvfb-run which can start Xvfb on the fly, execute your Node.js program and finally shut Xvfb down.
I'm developing web application using node js and mongo db. Initially I got this error - failed to connect to [localhost:27017]. I followed the steps in this answer [Link: https://stackoverflow.com/a/39276869/7697507]. But, after doing the 3rd step, I am getting this error.
Can anyone please let me know how to solve it?
Windows doesn't allow spaces in paths like this.
Try:
mongod --dbpath "C:\Users\dell pc\Desktop\Real Safe\final\data"
With the path in quotes.
I have an alpine machine on my virtual machine and I want to install mongodb. I added the package for mongodb using "apk add mongodb". I started mongo daemon using command mongod in one terminal. Then opened another terminal with mongo shell using mongo --disableJavaScriptJIT. I tried adding files and reading them from the database and that worked fine. But when I do sudo service mongodb restart I got the following output.
* Caching service dependencies ... [ ok ]
* Starting mongodb ...
* start-stop-daemon: failed to start `/usr/bin/mongod' [ !! ]
* ERROR: mongodb failed to start
The first thing you should do is to read the log file. I think that you’ll read here that mongodb doesn’t have rights to access some files. When you started it manually, you haven’t run it as user mongodb, have you…?
If this hypothesis is right, then the solution is to fix owner (and group) of the /var/lib/mongodb (recursively).
OK, so I have been searching a lot to get proper solution to the blocker I am facing right now. Let me give you a background of what I have done so far :
I want to run protractor tests (located on Linux machine) on IE 11 of Windows Server 2012 R2 (IP : 10.81.73.248). My protractorTest.conf.js has below :
exports.config = {
seleniumAddress: 'http://10.81.73.248:4444/wd/hub',
baseURL: 'http://10.81.78.137:80000/',
capabilities: {
browserName: 'internet explorer',
platform: 'ANY',
version: '11'
},
On my Windows Server 2012 R2 machine, I've downloaded IEDriverServer_Win32_2.47.0 and placed it under C:\Windows\System32, environment variable PATH has been updated with above location. Protected mode settings are same for all zones. Windows machine also has selenium-server-standalone-2.48.2.jar placed under C:\Users\Selenium.
On Windows machine, I am starting selenium server using below command :
java -jar selenium-server-standalone-2.48.2.jar -port 4444 -Dwebdriver.ie.driver="C:\Windows\System32\IEDriverServer_Win32_2.47.0\IEDriverServer.exe" , which starts selenium server fine.
With above settings, I run protractor tests from my Linux machine using grunt protractor_test, which launches IE browser on Windows machine, shows localhost:dynamic port and a message as : This is the initial page of webdriver server and within 2 seconds, closes the browser.
The exception I get on selenium server terminal is as below :
Session ID is null. Using WebDriver after calling quit() ?
This is where I am stuck at. I looked at various posts which describes similar issue (?) as mine along with the potential solution, but I am unable to resolve my issue here.
Is there anything I might be doing wrong to setup the connections ? or am I missing some steps to get me through ?
I would really appreciate if you guide me in resolving this long time pending blocker.
I think you are trying to run using old selenium version.It should be 2.53.x something.
Few basics things to check first regarding IE execution:
1).IE Setting for protractor(Selenium)
http://elgalu.github.io/2014/run-protractor-against-internet-explorer-vm/
2).Take IE driver of 32 bit(don't take 64 it has known slowness issues) and manually copy on the following path:
Root Folder\node_modules\protractor\node_modules\webdriver-manager\selenium\IEDriverServer_Win32_2.53.1
3). IE Driver can be downloaded from following path:
http://selenium-release.storage.googleapis.com/index.html?path=2.53/
**OR**
Please upgrade your protractor version to latest like 4.0.11 by changing the version in package.json file and do from command prompt(inside project root directory):
npm update
and then give update your selenium driver with following command from command prompt
webdriver-manager update --ie
it will update the selenium version of IE driver to latest and then try running your tests again.