How to deploy python crawler scripts on Linux and set up scheduled tasks

How to deploy python crawler scripts on Linux and set up scheduled tasks

Last year, due to project needs, I wrote a crawler in Python. The crawled data needs to be stored in the PG database of the production environment. Therefore, you need to deploy the script to the CentOS server and set up a scheduled task to automatically start the script.

The implementation steps are as follows:

1. Install pip (the operating system comes with python2.6 which can be used directly, but there is no pip)

# Download pip installation package wget "https://pypi.python.org/packages/source/p/pip/pip-1.5.4.tar.gz#md5=834b2904f92d46aaa333267fb1c922bb" --no-check-certificate
# Unzip the installation package and install tar -xzvf pip-1.5.4.tar.gz
cd pip-1.5.4
python setup.py install

2. Install third-party libraries with pip

pip install PyGreSQL==5.0.3
pip install requests==2.18.3

3. Set up scheduled tasks

# Start the scheduled task service service crond start
# View the scheduled task service status service crond status
# Open the scheduled task editing window crontab -e 
# Add two scheduled tasks, which will be executed once at 0:00 and 12:20 every day, and written to the log 0 0 * * * /usr/bin/python /home/longrise/psrd/collect.py > /home/longrise/psrd/collect.log 2>&1 &

20 12 * * * /usr/bin/python /home/longrise/psrd/collect.py > /home/longrise/psrd/collect.log 2>&1 &

The syntax of scheduled tasks is as follows:
# For details see man 4 crontabs

# Example of job definition:
# .---------------- minute (0 - 59)
# | .------------- hour (0 - 23)
# | | .---------- day of month (1 - 31)
# | | | .------- month (1 - 12) OR jan,feb,mar,apr ...
# | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# | | | | |
# * * * * * user-name command to be executed

The above method of deploying python crawler scripts in Linux and setting scheduled tasks is all the content that the editor shares with you. I hope it can give you a reference. I also hope that you will support 123WORDPRESS.COM.

You may also be interested in:
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  • Python scheduled task APScheduler example example detailed explanation
  • Several common methods for Python crawler scheduled tasks (recommended)

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