easy_install3 pip versus apt-get install python3-pip

[Brian Candler]

A minor question.

In the instructions for installation and for migrating to python3, it says to do "easy_install3 pip" instead of "apt-get install python3-pip"

Can someone explain why?  Is there a problem with the Ubuntu python3-pip package?

Thanks,

Brian.

[Jeremy Stretch]

The repo version of pip is typically pretty outdated. That said, you should have no problem installing pip either via either method and upgrading with `pip install -U pip`

Jeremy

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[Brian Candler]

Thanks for that.  My "old" version of pip was working fine, but I've upgraded it now.

I have an idea to help Netbox users run on python3.  The Ubuntu "supervisor" package depends on python2, so installs a bunch of python2 crud as dependencies.  I'd like to suggest that the Netbox install instructions are changed to show creating a systemd unit instead.

The following works for me.  Create a unit file /etc/systemd/system/netbox.service:

[Unit]

Description=Netbox - IP address management (IPAM) and data center infrastructure management (DCIM) tool

After=network-online.target

Wants=network-online.target

Conflicts=shutdown.target

[Service]

User=www-data

ExecStart=/usr/local/bin/gunicorn -c /opt/netbox/gunicorn_config.py netbox.wsgi

WorkingDirectory=/opt/netbox/netbox

Restart=on-failure

RestartSec=5

[Install]

WantedBy=multi-user.target

Then activate it:

systemctl daemon-reload

systemctl start netbox

systemctl enable netbox

With this approach, supervisord is no longer required. 

[Brian Candler]

There is a minor problem when you upgrade pip this way:

...

You are using pip version 8.1.1, however version 18.1 is available.

You should consider upgrading via the 'pip install --upgrade pip' command.

root@netbox:/opt/netbox# pip3 install --upgrade pip

Collecting pip

  Using cached https://files.pythonhosted.org/packages/c2/d7/90f34cb0d83a6c5631cf71dfe64cc1054598c843a92b400e55675cc2ac37/pip-18.1-py2.py3-none-any.whl

Installing collected packages: pip

  Found existing installation: pip 8.1.1

    Not uninstalling pip at /usr/lib/python3/dist-packages, outside environment /usr

Successfully installed pip-18.1

root@netbox:/opt/netbox# pip3 --version

Traceback (most recent call last):

  File "/usr/bin/pip3", line 9, in <module>

    from pip import main

ImportError: cannot import name 'main'

Oops.  Looks pip3 is broken.  But actually it isn't:

root@netbox:/opt/netbox# which pip3

/usr/local/bin/pip3

root@netbox:/opt/netbox# ls -l /usr/local/bin/pip*

-rwxr-xr-x 1 root root 215 Nov 27 09:32 /usr/local/bin/pip

-rwxr-xr-x 1 root root 214 Nov 14 14:48 /usr/local/bin/pip2

-rwxr-xr-x 1 root root 214 Nov 14 14:48 /usr/local/bin/pip2.7

-rwxr-xr-x 1 root root 215 Nov 27 09:32 /usr/local/bin/pip3

-rwxr-xr-x 1 root root 215 Nov 27 09:32 /usr/local/bin/pip3.5

root@netbox:/opt/netbox# /usr/local/bin/pip3 --version

pip 18.1 from /usr/local/lib/python3.5/dist-packages/pip (python 3.5)

It's just that the shell has cached the path /usr/bin/pip3.  After exiting and logging back in again, it's fine:

root@netbox:/opt/netbox# pip3 --version

pip 18.1 from /usr/local/lib/python3.5/dist-packages/pip (python 3.5)