Linux部署python爬虫脚本,并设置定时任务的方法

# 下载pip安装包
wget "https://pypi.python.org/packages/source/p/pip/pip-1.5.4.tar.gz#md5=834b2904f92d46aaa333267fb1c922bb" --no-check-certificate
# 解压安装包并安装
tar -xzvf pip-1.5.4.tar.gz
cd pip-1.5.4
python setup.py install

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

# 开启定时任务服务
service crond start
# 查看定时任务服务状态
service crond status
# 打开定时任务编辑窗口
crontab -e 
# 添加两条定时任务，即每天0点0分和12点20分各执行一次，并写入日志
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 &

定时任务语法如下：
# 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