I'm trying to set up a Jupyterhub instance to serve IPython notebooks on a Google Compute Engine. However, when running jupyterhub i am faced with an error regarding sockets:
[E 2015-08-31 10:27:55.617 JupyterHub app:1097]
Traceback (most recent call last):
File "/home/esten/anaconda3/envs/py3k/lib/python3.3/site- packages/jupyterhub/app.py", line 1095, in launch_instance_async
yield self.start()
File "/home/esten/anaconda3/envs/py3k/lib/python3.3/site-packages/jupyterhub/app.py", line 1027, in start
self.http_server.listen(self.hub_port, address=self.hub_ip)
File "/home/esten/anaconda3/envs/py3k/lib/python3.3/site-packages/tornado/tcpserver.py", line 126, in listen
sockets = bind_sockets(port, address=address)
File "/home/esten/anaconda3/envs/py3k/lib/python3.3/site-packages/tornado/netutil.py", line 187, in bind_sockets
sock.bind(sockaddr)
OSError: [Errno 99] Cannot assign requested address
The address/port assigned by the config file is localhost/8081, and binding a socket like below works perfectly fine
import socket
s = socket.socket()
s.bind(("localhost", 8081))
Does jupyterhub look somewhere else for the information or is something done differently when binding the socket through my own code?
This seems to be a problem with GCE not supporting ipv6.
I found this link explaining that enabling ipv6 solved the issue on another machine.
Running using --ip solved the issue:
jupyter notebook --ip="*"
Related
I'm trying to use the adafruit minimqtt library on a Pi Pico H, running circuitpython. I've been following this guide
I'm using a mosquito broker on my windows 10 laptop and connecting directly through an ethernet cable to the Wiznet hat, as in the tutorial. The code I'm using is copied directly from the example with the following changes:
changed the IP address on line 22 to that of my windows machine
uncommneted lines 68 and 70, and commented out line 73 to avoid using DHCP (someone else on the github has noted that the dhcp doesn't work). Also deleted the extra space in line 70
I get the following error:
Traceback (most recent call last):
File "<stdin>", line 84, in <module>
File "/lib/adafruit_minimqtt/adafruit_minimqtt.py", line 441, in connect
File "/lib/adafruit_minimqtt/adafruit_minimqtt.py", line 266, in _get_connect_socket
File "/lib/adafruit_wiznet5k/adafruit_wiznet5k_socket.py", line 246, in connect
File "/lib/adafruit_wiznet5k/adafruit_wiznet5k.py", line 570, in socket_connect
RuntimeError: Failed to establish connection.
I've looked through each of the scripts referenced and can't find any obvious errors (I'm not an expert in this so there might be something I've missed). I can't find anyone who's experienced this same error code, any help here would be appreciated.
I've tried running the first half of the code (up to line 68), and then pinging the pico from my laptop. I've also pinged my laptop from the board. Both were successful, so I don't think it's a hardware issue.
I've double checked that my broker is not in local mode. My .conf file contains
listener 1883
allow_anonymous true
and when I run mosquitto I get
C:\Users\me1xmtx\mosquitto>mosquitto -c rem.conf -v
1676306316: mosquitto version 2.0.15 starting
1676306316: Config loaded from rem.conf.
1676306316: Opening ipv6 listen socket on port 1883.
1676306316: Opening ipv4 listen socket on port 1883.
1676306316: mosquitto version 2.0.15 running
TCP (and UDP just in case) ports 1883 are open on the windows laptop
I am trying to install airflow (distributed mode) in WSL, I got the setup of Airflow webserver, Airflow Scheduler, Airflow Worker, Celery (3.1) and RabbitMQ.
While running the Airflow Scheduler it is throwing out this error (below) even though the backend is set up.
ERROR
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/airflow/executors/celery_executor.py", line 92, in sync
state = task.state
File "/usr/local/lib/python3.6/dist-packages/celery/result.py", line 398, in state
return self._get_task_meta()['status']
File "/usr/local/lib/python3.6/dist-packages/celery/result.py", line 341, in _get_task_meta
return self._maybe_set_cache(self.backend.get_task_meta(self.id))
File "/usr/local/lib/python3.6/dist-packages/celery/backends/base.py", line 288, in get_task_meta
meta = self._get_task_meta_for(task_id)
AttributeError: 'DisabledBackend' object has no attribute '_get_task_meta_for'
https://issues.apache.org/jira/browse/AIRFLOW-1840
This is the exact error I am getting but couldn't find a solution.
Result Backend-
result_backend = db+postgresql://postgres:****#localhost:5432/postgres
broker_url = amqp://rabbitmq_user_name:rabbitmq_password#localhost/rabbitmq_virtual_host_name
Help please, gone through almost all the documents but couldn't find a solution
I was facing the same issue on celery version - 3.1.26.post2 (with rabitmq,postgresql and airflow),the reason for this issue is the dictionary used in celery base.py file at(lib/python3.5/site-packages/celery/app/base.py)
does not capture celery backend at key CELERY_RESULT_BACKEND instead it captures at key result_backend.
So the solution here is go to _get_config function available in base.py file at(lib/python3.5/site-packages/celery/app/base.py),at the end of the function before returning dictionary s add the below code.
s['CELERY_RESULT_BACKEND'] = s['result_backend'] #code to be added
return s
This solved the problem.
I am using Raspberry Pi Zero W with a PiTFT. I have managed to put an image on the screen as explained here: https://learn.adafruit.com/adafruit-pitft-28-inch-resistive-touchscreen-display-raspberry-pi
After that, I've tried to use the Adafruit Python ILI9341 as explained here: https://github.com/adafruit/Adafruit_Python_ILI9341
There is no problem at the instalation, BUT when I've tried to execute an example it said:
Traceback (most recent call last):
File "image.py", line 41, in <module>
disp = TFT.ILI9341(DC, rst=RST, spi=SPI.SpiDev(SPI_PORT,
SPI_DEVICE, max_speed_hz=64000000))
File "build/bdist.linux-armv6l/egg/Adafruit_GPIO/SPI.py", line 42,
in __init__
IOError: [Errno 2] No such file or directory
The tree hierarchy is missing starting with the 'egg' folder.
I've tried to manually create it, but I got the same error.
My instincts were that there is a problem with the SPI connection or the spidev kernel module.
There is no spi device in the /dev/ directory.
In the /boot/config.txt the spi is on, I've enabled it in the raspi-config menu. I've also checked and it is not even blacklisted.
I am using a pi image, not a PiTFT image.
Please HELP!
I work in an Azure environment. I have a VM that runs a Django application (Open edX) and a Mongo server on another VM instance (Ubuntu 16.04). Whenever I try to load anything in the application (where the data is fetched from the Mongo server), I would get an error like this one:
Feb 23 12:49:43 xxxxx [service_variant=lms][mongodb_proxy][env:sandbox] ERROR [xxxxx 13875] [mongodb_proxy.py:55] - Attempt 0
Traceback (most recent call last):
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/mongodb_proxy.py", line 53, in wrapper
return func(*args, **kwargs)
File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/contentstore/mongo.py", line 135, in find
with self.fs.get(content_id) as fp:
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/gridfs/__init__.py", line 159, in get
return GridOut(self.__collection, file_id)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/gridfs/grid_file.py", line 406, in __init__
self._ensure_file()
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/gridfs/grid_file.py", line 429, in _ensure_file
self._file = self.__files.find_one({"_id": self.__file_id})
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/pymongo/collection.py", line 1084, in find_one
for result in cursor.limit(-1):
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/pymongo/cursor.py", line 1149, in next
if len(self.__data) or self._refresh():
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/pymongo/cursor.py", line 1081, in _refresh
self.__codec_options.uuid_representation))
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/pymongo/cursor.py", line 996, in __send_message
res = client._send_message_with_response(message, **kwargs)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/pymongo/mongo_client.py", line 1366, in _send_message_with_response
raise AutoReconnect(str(e))
AutoReconnect: timed out
First I thought it was because my Mongo server lived in an instance outside of the Django application's virtual network. I created a new Mongo server on an instance inside the same virtual network and would still get these issues. Mind you, I receive the data eventually but I feel like I wouldn't get timed out errors if the connection is normal.
If it helps, here's the Ansible playbook that I used to create the Mongo server: https://github.com/edx/configuration/tree/master/playbooks/roles/mongo_3_2
Also I have tailed the Mongo log file and this is the only line that would appear at the same time I would get the timed out error on the application server:
2018-02-23T12:49:20.890+0000 [conn5] authenticate db: edxapp { authenticate: 1, user: "user", nonce: "xxx", key: "xxx" }
mongostat and mongotop don't show anything out of the ordinary. Also here's the htop output:
I don't know what else to look for or how to fix this issue.
I forgot to change the Mongo server IP's in the Django application settings to point to the new private IP address inside the virtual network instead of the public IP. After I've changed that it don't get that issue anymore.
If you are reading this, make sure you change the private IP to a static one in Azure, if you are using that IP address in the Djagno application settings.
I have connected a-gsm shield http://itbrainpower.net/a-gsm/downloadables/a-gsm-series-presentation-v1.01.pdf with Raspberry Pi 3.
I have imported and attempted to execute power on code http://itbrainpower.net/a-gsm/RaspberryPI-gsm-shield-library-powerOnOff-demo-code-a-gsm. However, I am getting the following error message:
sudo ./poweronoff.py
Traceback (most recent call last):
File "./poweronoff.py", line 66, in <module>
agsm.open()
File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 271, in open
raise SerialException("Port is already open.")
serial.serialutil.SerialException: Port is already open.
I assume I need to open a different port. If that is the solution, how do I do it. If that is not the solution, what do I need to do to satisfy this error message?
Follow directions in this post https://www.raspberrypi.org/forums/viewtopic.php?uid=195125&f=28&t=165897&start=0.
Basically, "enable_uart=1" should be the last line in '/boot/config.txt' for serial port operations. Reboot the RPi3 and everything should work.