If you are using CentOS 6 you can use this tutorial to install both Python 2.7.x and Python 3.6.x. For CentOS 7 only the Python 3.6.x instructions below are applicable. Warning! Do not install Python 2.7.13 on CentOS 7 using these instructions. Your system will end up having two different python2.7 binaries, each with its own package directory. This will likely cause difficult-to-diagnose problems.
$ which python /usr/local/bin/python $ python -V Python 2.7.3 $ ls -ltr /usr/local/bin/pyth* lrwxrwxrwx 1 root root 24 Jan 30 2013 /usr/local/bin/python -> /usr/local/bin/python2.7 -rwxr-xr-x 1 root root 6162289 Sep 3 00:59 /usr/local/bin/python2.7 -rwxr-xr-x 1 root root 1624 Sep 3 01:00 /usr/local/bin/python2.7-config
So yum will use ‘/usr/bin/python’ which is 2.6
$ /usr/bin/python -V Python 2.6.6
“python” will give you python 2.7.
“python2.7” will give you python 2.7.
“easy_install” and “easy_install-2.7” will easy install for python 2.7. While separate files, they both seem to install into /usr/local/lib/python2.7/site-packages/
$ ls -ltr /usr/local/bin | grep easy_ -rwxr-xr-x 1 root root 340 Jan 30 2013 easy_install-2.7 -rwxr-xr-x 1 root root 332 Jan 30 2013 easy_install
note the dash before the 2.7
The easy_install’s in /usr/bin are for 2.6
$ ls -ltr /usr/bin/easy* -rwxr-xr-x. 1 root root 331 Nov 11 2010 /usr/bin/easy_install-2.6 -rwxr-xr-x. 1 root root 323 Nov 11 2010 /usr/bin/easy_install
###I would recommend python 2.7 on all local machines I suspect everyone is already ok?. To check:
[[email protected] etc]# python -V Python 2.7.3
Instructions for python 2.7 install on windows 7, ubuntu, mac will be on another page.
Because of centos 6.3 on the cluster machines, we need both 2.6 and 2.7 to coexist there. hopefully only there.
Centos relies on python 2.6 for yum
if you install python 2.7 in any way other than the following you will destroy the system and make yum inoperable
zlib failure message may be from internal python scripts doing uncompression and they may be referring to python module files, rather than looking at links directly. Not sure.
I believe only the x86_64 zlib is needed. i.e. you don’t need 32-bit and 64-bit, but just follow these instructions. They worked on apu.0xdata.loc (192.168.1.160) on 9/28/2012
to check centos version
[[email protected] etc]# cat /etc/redhat-release CentOS release 6.9 (Final)
CentOS 6.9 ships with Python 2.6.6 and depends on that specific version. Be careful not to replace it or bad things will happen. If you need access to a newer version of Python you must compile it yourself and install it side-by-side with the system version.
Here are the steps necessary to install Python 2.7.6. Execute all the commands below as root. Either log in as root temporarily or use sudo.
###Install development tools
In order to compile Python you must first install the development tools:
yum groupinstall "Development tools"
You also need a few extra libs installed before compiling Python or else you will run into problems later when trying to install various packages:
yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel
###Download, compile and install Python
The –no-check-certificate is optional
cd /opt wget --no-check-certificate https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tar.xz tar xf Python-2.7.13.tar.xz cd Python-2.7.13 ./configure --prefix=/usr/local make && make altinstall
It is important to use altinstall instead of install, otherwise you will end up with two different versions of Python in the filesystem both named python.
(Depending on your version of wget, you may need to add the –no-check-certificate option to the wget command line.)
After running the commands above your newly installed Python 2.7.6 interpreter will be available as /usr/local/bin/python2.7 and the system version of Python 2.6.6 will be available as /usr/bin/python and /usr/bin/python2.6.
[email protected]:/opt/Python-2.7.6 ] ls -ltr /usr/bin/python* lrwxrwxrwx 1 root root 6 Nov 16 2002 /usr/bin/python2 -> python -rwxr-xr-x 1 root root 1418 Jul 10 2013 /usr/bin/python2.6-config -rwxr-xr-x 2 root root 4864 Jul 10 2013 /usr/bin/python2.6 -rwxr-xr-x 2 root root 4864 Jul 10 2013 /usr/bin/python lrwxrwxrwx 1 root root 16 Oct 24 15:39 /usr/bin/python-config -> python2.6-config [email protected]:/opt/Python-2.7.6 ] ls -ltr /usr/local/bin/python* -rwxr-xr-x 1 root root 6214533 Mar 19 22:46 /usr/local/bin/python2.7 -rwxr-xr-x 1 root root 1674 Mar 19 22:46 /usr/local/bin/python2.7-config
If things don’t look right, you might need to create a symbolic link in /usr/local/bin
cd /usr/local/bin ls -ltr python*
WARNING: don’t do this before checking the $PATH for root. if it has /usr/local/bin before /usr/bin, it will see python2.7 first i.e.
[email protected]openstack h2o]# echo $PATH /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
If you add this link, do a “which python” for the user and for root. If root is pointing to /usr/local/bin/python, remove the link you just added, and figure out something else.
ln -s /usr/local/bin/python2.7 /usr/local/bin/python
sudo sh [email protected]:~ ] which python /usr/bin/python [email protected]:/home/0xdiag ] python Python 2.6.6 (r266:84292, Jul 10 2013, 22:48:45) [GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2 [email protected]:~ ] exit sudo - user [email protected]:~ ] which python /usr/local/bin/python [email protected]:~ ] python Python 2.7.6 (default, Mar 19 2014, 22:45:29) [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2 Type "help", "copyright", "credits" or "license" for more information.
###Installing and configuring distribute (setuptools)
After installing Python 2.7.6 you also need to install distribute (setuptools) so you can easily install new packages in the right location.
wget --no-check-certificate https://bootstrap.pypa.io/ez_setup.py sudo /usr/local/bin/python2.7 ez_setup.py sudo /usr/local/bin/easy_install-2.7 pip
The commands above will generate the script /usr/local/bin/easy_install-2.7. Use this script to install packages for your new Python version. You should be able to use “easy_install” if “which easy_install” points to the correct 2.7 versions
I’m jumping between two different machine installs here, sorry about that, pay attention to /usr/local/bin vs /usr/bin
[email protected]$ which pip /usr/local/bin/pip $ which easy_install /usr/local/bin/easy_install $ ls -ltr /usr/local/bin/easy_install* -rwxr-xr-x 1 root root 340 Jan 30 2013 /usr/local/bin/easy_install-2.7 -rwxr-xr-x 1 root root 332 Jan 30 2013 /usr/local/bin/easy_install sudo /usr/local/bin/easy_install-2.7 requests sudo /usr/local/bin/easy_install-2.7 psutil sudo /usr/local/bin/easy_install-2.7 paramiko (for normal user, easy_install should work too, if your PATH gets /usr/local/bin first)
I had to rename pip and easy_install in /user/local/bin and create links. The existing ones were 2.6 variants. Check first though if pip and easy_install act right after install. On this system they did:
[[email protected] kevin]# cd /usr/local/bin [[email protected] bin]# ls -ltr pip* -rwxr-xr-x 1 root root 213 Oct 20 22:55 pip2.7 -rwxr-xr-x 1 root root 213 Oct 20 22:55 pip2 -rwxr-xr-x 1 root root 296 Oct 20 22:58 pip3.4 -rwxr-xr-x 1 root root 290 Oct 20 22:58 pip -rwxr-xr-x 1 root root 292 Oct 20 22:58 pip3
I think if root uses pip or easy_install it will install into python 2.7, not 2.6 maybe that doesn’t matter
On this system, it’s because /usr/local/bin comes before /usr/bin
[[email protected] bin]# which pip /usr/local/bin/pip [[email protected] bin]# which easy_install /usr/local/bin/easy_install [[email protected] bin]# pip --version pip 1.5.6 from /usr/local/lib/python2.7/site-packages (python 2.7) [[email protected] bin]# easy_install --version setuptools 7.0 [[email protected] bin]# pip2.7 --version pip 1.5.6 from /usr/local/lib/python2.7/site-packages (python 2.7) [[email protected] bin]#
Fixing the $PATH would make that correct, since the 2.6 gets resolved correctly with /usr/bin
[[email protected] bin]# /usr/bin/pip --version pip 1.3.1 from /usr/lib/python2.6/site-packages (python 2.6) [email protected] bin]# /usr/bin/easy_install --version distribute 0.6.10
In any case, if this doesn’t cause a problem due to $PATH in root or users, you can do this:
cd /usr/local/bin mv pip pip2.6 mv easy_install easy_install-2.6 ln -s pip2.7 pip ln -s easy_install-2.7 easy_install
result in /usr/local/bin
-rwxr-xr-x 1 root root 6214533 Mar 19 22:46 python2.7 -rwxr-xr-x 1 root root 1674 Mar 19 22:46 python2.7-config lrwxrwxrwx 1 root root 24 Mar 19 22:51 python -> /usr/local/bin/python2.7 -rwxr-xr-x 1 root root 323 Mar 19 23:18 easy_install-2.6 -rwxr-xr-x 1 root root 331 Mar 19 23:18 easy_install-2.7 -rwxr-xr-x 1 root root 296 Mar 19 23:22 pip2.7 -rwxr-xr-x 1 root root 290 Mar 19 23:22 pip2.6 -rwxr-xr-x 1 root root 292 Mar 19 23:22 pip2 lrwxrwxrwx 1 root root 16 Mar 19 23:29 easy_install -> easy_install-2.7
result in /usr/bin
ls -ltr /usr/bin/pip -rwxr-xr-x 1 root root 281 Oct 24 15:38 /usr/bin/pip ls -ltr /usr/bin/easy_install -rwxr-xr-x 1 root root 323 Nov 11 2010 /usr/bin/easy_install