Centos 7 + Python 3(4,5,6,7,8) installation guide with no pain. As for me.
I can’t even say how many times I have to update my python executables for web servers and how much pain I feel during this routine.
Usual Google\StackOverflow advice only describes one particular problem. But there’re few of them, and they’re different so you spent hours trying to collect them all and pick the right decision.
Then you just drop it and use yum for any latest python version available!
Here I’ll show you and make a reminder for myself about how to install modern python in the best way, once, without pain.
I use Centos 7 typical install as for WebServer (minimal install could require to install tonnes of dev-libs and yum, be sure you prepared them before)
You need to install some compil libs.
yum install gcc openssl-devel bzip2-devel libffi-devel
2. Download Python:
cd /usr/src wget https://www.python.org/ftp/python/3.8.0/Python-3.8.0.tgz tar xzf Python-3.8.0.tgz cd Python-3.8.0
3. Configure and install:
/configure --prefix=/usr/local --enable-optimizations --enable-shared LDFLAGS="-Wl,-rpath /usr/local/lib" make altinstall
- –prefix – a usual place of an interpreter to install.
- –enable-optimizations – python runs faster (proof)
- –enable-shared allow use shared libs (proof)
- LDFLAGS=”-Wl,-rpath /usr/local/lib” – most important – install system variable to locate .so modules for new python.
- make altinstall – install without interruption of the system python
Errors you may see when LD path do not set or used incorrectly:
/var/www/web/venv/bin/python3.8: error while loading shared libraries: libpython3.8.so.1.0: cannot open shared object file: No such file or directory
Extra steps to fix it:
- Check reference cat /etc/ld.so.conf – should load “* so.conf.d”
- vi /etc/ld.so.conf.d/libpython3.8.conf
- Add: /usr/local/lib/
- Add: /usr/local/lib/libpython3.8.so.1.0
- /sbin/ldconfig -v – to load them all (-v for visible mode)
You could also try this:
export LD_LIBRARY_PATH=/usr/local/lib export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib/libpython3.8.so.1.0
How about pip and python3 from cmd:
Just adding symlinks to easy use of python3 and pip3:
(do not overlap with python2.7)
ln -s /usr/local/bin/python3.8 /usr/bin/python3 ln -s /usr/local/bin/pip3.8 /usr/bin/pip3
# python3 Python 3.8.0 (default, Oct 28 2019, 14:23:46) [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] on linux Type "help", "copyright", "credits" or "license" for more information.
pip3 Usage: pip3 [options]
# whereis python python: /usr/bin/python /usr/bin/python2.7 /usr/bin/python2.7-config /usr/lib/python2.7 /usr/lib64/python2.7 /etc/python /usr/local/bin/python3.8 /usr/local/bin/python3.8-config /usr/local/lib/python3.8 /usr/include/python2.7 /usr/share/man/man1/python.1.gz /usr/src/Python-3.8.0/python
# which python /usr/bin/python
That’s all folks!
Next: How to mod_wsgi + Django + Celery and so on.