If above article doesn't help to resolve this issue please use https://bugs.centos.org/.

http://mirror.sfo12.us.leaseweb.net/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://mirror.rackspace.com/CentOS/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://mirrors.rit.edu/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://www.gtlib.gatech.edu/pub/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://ohioix.mm.fcix.net/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://mirrors.xtom.com/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://mirrors.raystedman.org/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://coresite.mm.fcix.net/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/pip/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/pip/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/pip/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/pip/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/pip/
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: Skipping numpy as it is not installed.
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
WARNING: Skipping scipy as it is not installed.
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/numpy/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/numpy/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/numpy/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/numpy/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/numpy/
ERROR: Could not find a version that satisfies the requirement numpy (from versions: none)
ERROR: No matching distribution found for numpy
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/scipy/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/scipy/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/scipy/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/scipy/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/scipy/
ERROR: Could not find a version that satisfies the requirement scipy (from versions: none)
ERROR: No matching distribution found for scipy
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/traitlets/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/traitlets/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/traitlets/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/traitlets/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/traitlets/
ERROR: Could not find a version that satisfies the requirement traitlets (from versions: none)
ERROR: No matching distribution found for traitlets
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/ipython/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/ipython/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/ipython/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/ipython/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/ipython/
ERROR: Could not find a version that satisfies the requirement ipython (from versions: none)
ERROR: No matching distribution found for ipython
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/casatools/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/casatools/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/casatools/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/casatools/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/casatools/
ERROR: Could not find a version that satisfies the requirement casatools (from versions: none)
ERROR: No matching distribution found for casatools
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/casatasks/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/casatasks/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/casatasks/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/casatasks/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /repository/pypi-group/simple/casatasks/
ERROR: Could not find a version that satisfies the requirement casatasks (from versions: none)
ERROR: No matching distribution found for casatasks
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Switched to a new branch 'CAS-14029'
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: Requirement '/casampi/dist/casampi-*-py3-none-any.whl' looks like a filename, but the file does not exist
ERROR: Could not install packages due to an OSError: [Errno 2] No such file or directory: '/casampi/dist/casampi-*-py3-none-any.whl'

WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
mkdir: cannot create directory ‘/home/casatest/.casa’: File exists
mkdir: cannot create directory ‘/root/.casa’: File exists
Unexpected end of /proc/mounts line `overlay / overlay rw,relatime,lowerdir=l/2ZDKDLZFA24NNY4RLQAKNBFKDP:l/H3QVOGKJGTZMQW64WDKYKLZTGY:l/VPDZKY3KIWGHHR4WNXMFYZ3XR2:l/Z3R5DQIITHM5O2TZSRKE7O4KWI:l/GQU5V5W2BGPOIQN5YBELUCGZBW:l/WRIZEUFNAYUD4T2FCBTSJB6Q7K:l/XYLB7UL3UL5MPBECRGOXUIPZ7M:l/MCMHFDSEI45D52XQZAYYMD5LZ7:l/UWLAKNNEIETON46BVKSUIKVWI4:l/3KEAC4LXOM3K5GZWHOC4HDTYOH:l/ZITNGSDT7RY334HFDQXXXNBEZ2:l/EIO65RQCDUCZ3P64KRP4SIPMQO:l/W2KDIM65H4YL5HGWEBPOQCXSDR:l/KZSQGGHPNMXK6H5JFULZS2L54C:l/5TWOF745XRYMLG2SMAW2EBVTSO:l/XNHDUPDALZTOEY3XEBMXATYDLS:l/SMRHWV'
Unexpected end of /proc/mounts line `GFA5MTV3VHGPYJRRX7L5:l/7LHSEBGSCCFAUPNYI7IYZN35DH:l/O4EPR4LJOILZS6XYVM4PKOKHYI:l/VJCB2ZP6ZEDRPZRC6RAE2NSIQ6:l/CJT43QNGUHFGDPOYVAVRI2JEGB:l/NHOQ4CSDGUANRYYV3ETPH7H67J:l/RYY5XLS4QDZ6GTBNEK6I4XCABB:l/C53TUQS6QMCWPBEPNQG64JFBVG:l/EEN465A26A2LCR7BL7R2R3XYEM:l/FS4CP5BOVUKM7DNTE7ZAZU5WRO:l/VUT455RO3HNWCS2C6P7HVGLK2U:l/HSGE2HZHNIHG2T6F7XT4CW3JYC:l/OTGRAHMRNZPECUM2F5PKJ67KUS:l/V3KEQYHS4ODBN3Q7POCOUNL2EN:l/EZ5TILOATCH4FHEHCH6DUU6HPX:l/S5UEV6JOVAWWPY4GA6MLLNIQ4T:l/UV6F37NIQXGOPGWS54PH4IZE7F:l/TCH74BRYZX3WVYP7QT5RGQFL'
Unexpected end of /proc/mounts line `R3:l/VR7Y7CY3QECVLPWL5WZCPV2O4W:l/JHBHX4X3ENTNDUFU4CP7KX5MYL:l/V77BUVXFAB353TH6QSCIXDJFS3:l/MGJRR6SGPWFZWYZJKKKOXOO5QU:l/IJ2FWTHA4YPG43TJMWXRKSFIC3:l/VQL72NLADMTUM27RYOSHBHYQXR:l/Y3JNGUGE5Y7PQSWA4VGRQBVXNF:l/7PORRK6R6CGHSC7Z7T7JNHSJOB:l/M74OSXTLH6E6DFGM3SNMTDD326:l/5IBKXSQ4X3WWDMT273ALDUFFVB:l/BVHME3FIUCT7FAQMTPE3WZLBRX:l/QAJL7XVCDTLZL7VFECEG43ME7C:l/65K6O666ISV4M36NEDO5MYUROZ:l/PGDJTIUP33FIOKHK6M3SCRXDDU:l/EOPMIXTHVTDVEXKBNXN5BWVKI3:l/GWM2QSRIXRHUVO7AO6R6AORRHC:l/LNFFPCXWVHTXR6FKFHQCZHPTFH:l/T4F6G2PZNGWBV'
Unexpected end of /proc/mounts line `APMAXOMVLEYRW:l/L5P7STVBCCIRYKMSFHIBGFUJYW:l/YP5GEJP7FF3OAFBPQRPIW6VODG:l/2LFN4YG5ZCAJIY2R35725QJFHC:l/55N73EHHD6KJMXRUBGAIWM5H3O:l/5GOEKJLHEJIQRXCI7Y6KFFU6WS:l/TXB5GHKPQN6XV2MDRISDH6TR6U:l/HQRA7WRUWRREY6FEVF3DDOHOA2:l/OVGJO3CI5RYCEBC3JD3G7XQKP6:l/I2WOLD6ZB7B27AKTYIY2CJSITI:l/IZ4DQRVDCDQOB7MVQRHQGB35J4:l/MFWSVY2FZWY6W74NNXGOS3XR5O:l/DOMLXBY5NZEO6IJCRR5FQZ5EW6:l/VG6G7GP7SRLJFYZ2SKN3DYBRBZ,upperdir=926946b6794d1da08baf8efa1290c95ccd72defd0fda15c665a3e27233d86e22/diff,workdir=926946b6794d1da08baf8efa1290c95cc'
python3: can't open file '/casampi/src/casampi/tests/test_casampi.py': [Errno 2] No such file or directory
mv: cannot stat ‘casampi/dist/*-any.whl’: No such file or directory
chown: cannot access ‘/wheeldirectory/*-any.whl’: No such file or directory