Centos 7系统运行docker build命令报错

[jasoncsee]

Sending build context to Docker daemon 754.7kB
Step 1/6 : FROM python:3.7
---> 84d66a048f90
Step 2/6 : ADD ./crontask /etc/cron.d/crontask
---> Using cache
---> ec6d2bf817ad
Step 3/6 : WORKDIR /srv
---> Using cache
---> 225f70053d36
Step 4/6 : RUN pip install -U Flask && apt-get update && apt-get install -y --no-install-recommends cron git wget && apt autoremove -y && apt-get clean && rm -rf /var/lib/apt/lists/* && chmod 0644 /etc/cron.d/crontask && touch /home/boot.sh && echo "#!/bin/sh\n" > /home/boot.sh && echo "service cron start" >> /home/boot.sh && echo "\n" >> /home/boot.sh && echo "/usr/local/bin/python /srv/iptv/python/main.py" >> /home/boot.sh && echo "\n" >> /home/boot.sh && echo "/bin/bash" >> /home/boot.sh && git clone https://github.com/EvilCult/iptv-m3u-maker.git && mv iptv-m3u-maker iptv
---> Running in 631c9fc1ac4b
Collecting Flask
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate is not yet valid (_ssl.c:1076)'))': /packages/f2/28/2a03252dfb9ebf377f40fba6a7841b47083260bf8bd8e737b0c6952df83f/Flask-1.1.2-py2.py3-none-any.whl
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate is not yet valid (_ssl.c:1076)'))': /packages/f2/28/2a03252dfb9ebf377f40fba6a7841b47083260bf8bd8e737b0c6952df83f/Flask-1.1.2-py2.py3-none-any.whl
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate is not yet valid (_ssl.c:1076)'))': /packages/f2/28/2a03252dfb9ebf377f40fba6a7841b47083260bf8bd8e737b0c6952df83f/Flask-1.1.2-py2.py3-none-any.whl
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', OSError(0, 'Error'))': /packages/f2/28/2a03252dfb9ebf377f40fba6a7841b47083260bf8bd8e737b0c6952df83f/Flask-1.1.2-py2.py3-none-any.whl
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate is not yet valid (_ssl.c:1076)'))': /packages/f2/28/2a03252dfb9ebf377f40fba6a7841b47083260bf8bd8e737b0c6952df83f/Flask-1.1.2-py2.py3-none-any.whl
ERROR: Could not install packages due to an EnvironmentError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Max retries exceeded with url: /packages/f2/28/2a03252dfb9ebf377f40fba6a7841b47083260bf8bd8e737b0c6952df83f/Flask-1.1.2-py2.py3-none-any.whl (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate is not yet valid (_ssl.c:1076)')))

The command '/bin/sh -c pip install -U Flask && apt-get update && apt-get install -y --no-install-recommends cron git wget && apt autoremove -y && apt-get clean && rm -rf /var/lib/apt/lists/* && chmod 0644 /etc/cron.d/crontask && touch /home/boot.sh && echo "#!/bin/sh\n" > /home/boot.sh && echo "service cron start" >> /home/boot.sh && echo "\n" >> /home/boot.sh && echo "/usr/local/bin/python /srv/iptv/python/main.py" >> /home/boot.sh && echo "\n" >> /home/boot.sh && echo "/bin/bash" >> /home/boot.sh && git clone https://github.com/EvilCult/iptv-m3u-maker.git && mv iptv-m3u-maker iptv' returned a non-zero code: 1