Category: python

Install supervisor

# update apt 
sudo apt-get update -y

# install supervisor
sudo apt-get install supervisor -y

# check if supervisor is running fine
sudo systemctl status supervisor

Enable Supervisor Web Interface

# edit supervisor configuration file
sudo nano /etc/supervisor/supervisord.conf

Add the below line in the end of supervisor.conf file

[inet_http_server]
port=*:9001
username=admin
password=admin

# restart supervisor to see your conf changes
sudo systemctl restart supervisor

Install Jupyter lab

Check the official website for latest installation instructions. Below line is what I used.

# run one of the below installation PIP
pip install jupyterlab
# or
pip3 install jupyterlab

Run jupyter lab

jupyter lab

If you get an error that this command is not found, then you probably need to add this command to your system PATH

Edit the bashrc file

nano ~/.bashrc

Add the below line to the end of this file

export PATH="$HOME/.local/bin:$PATH"

source ~/.bashrc

Now try running jupyter lab command again, it should work fine

Installing Jupyter as a service

Create a conf file inside supervisor conf directoruy

sudo nano /etc/supervisor/conf.d/jupyter.conf

Paste the below code in the jupyter.conf file

[program:jupyter]
command=/home/panther/.local/bin/jupyter lab --port 5000 --no-browser --ip="0.0.0.0" --NotebookApp.token='' --NotebookApp.password=''
user=panther
autostart=true
autorestart=true
startretries=5
numprocs=1
startsecs=0
process_name=%(program_name)s_%(process_num)02d
stderr_logfile=/var/log/supervisor/%(program_name)s_stderr.log
stderr_logfile_maxbytes=10MB
stdout_logfile=/var/log/supervisor/%(program_name)s_stdout.log
stdout_logfile_maxbytes=10MB

NOTE:

1. change the user value
2. add a password to --NotebookApp.password
3. change the home directory in command, mine is panther so it is /home/panther. Yours is most likely ubuntu

Access the app from browser

http://<IP>:5000/lab

when decoding the data into a list, for time columns using the isoformat() method as shown in the above image.

class Message(Base):
    __tablename__ = 'message'

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    time_created = Column(DateTime(timezone=True), server_default=func.now())
    time_updated = Column(DateTime(timezone=True), server_default=func.now())

    def to_json(self):
        # get columns data
        data = {}
        columns = list(self.__table__.columns)
        for column in columns:
            if column.name == 'time_created':
                data[column.name] = self.time_created.isoformat()
            elif column.name == 'time_updated':
                data[column.name] = self.time_updated.isoformat()
            else:
                data[column.name] = self.__dict__[column.name]
        return data