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Update centos.markdown (#2183)

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Added details for installing and enabling software collections and the adjustment needed to the systemd unit file.
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seanb-uk 2017-03-04 12:45:15 +00:00 committed by Fabian Affolter
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@ -13,3 +13,50 @@ To run Python 3.x on [CentOS](https://www.centos.org/) or RHEL (Red Hat Enterpri
There are effort in progress to bring Python 3.4 to [Extra Packages for Enterprise Linux (EPEL)](https://fedoraproject.org/wiki/EPEL) which will allow you to follow the [Fedora Instructions](/docs/installation/fedora/).
### {% linkable_title Using Software Collections %}
First of all install the software collection repository as root. For example, on CentOS:
```bash
$ yum install centos-release-scl
```
Then install the Python 3.5 package:
```bash
$ yum install rh-python35
```
Once installed, switch to your homeassistant user (if you've set one up), enable the software collection and check that it has set up the new version of Python:
```bash
$ scl enable rh-python35 bash
$ python --version
Python 3.5.1
```
You will be in a command shell set up with Python 3.5 as your default version. The virtualenv and pip commands will be correct for this version, so you can now create a virtual environment and install home assistant following the main [instructions](https://home-assistant.io/docs/installation/virtualenv/#step-4-set-up-the-virtualenv).
You will need to enable the software collection each time you log on before you activate your virtual environment.
### {% linkable_title Systemd with Software Collections %}
To autostart homeassistant using systemd follow the main [instructions](https://home-assistant.io/docs/autostart/systemd/) and adjust the template as follows:
```
[Unit]
Description=Home Assistant
After=network.target
[Service]
Type=simple
User=homeassistant
# Make sure the virtualenv Python binary is used
Environment=VIRTUAL_ENV="/srv/homeassistant"
Environment=PATH="$VIRTUAL_ENV/bin:$PATH"
# ExecStart using software collection:
ExecStart=/usr/bin/scl enable rh-python35 -- /srv/homeassistant/bin/hass -c "/home/homeassistant/.homeassistant"
[Install]
WantedBy=multi-user.target
```