Update installation docs to use CentOS 8

docs/installation/1-postgresql.md

@@ -9,7 +9,7 @@ This section entails the installation and configuration of a local PostgreSQL da
 
 #### Ubuntu
 
-If a recent enough version of PostgreSQL is not available through your distribution's package manager, you'll need to install it from an official [PostgreSQL repository](https://wiki.postgresql.org/wiki/Apt).
+Install the PostgreSQL server and client development libraries using `apt`.
 
 ```no-highlight
 sudo apt update
@@ -18,15 +18,14 @@ sudo apt install -y postgresql libpq-dev
 
 #### CentOS
 
-CentOS 7 does not ship with a recent enough version of PostgreSQL, so it will need to be installed from an external repository. The instructions below show the installation of PostgreSQL 9.6, however you may opt to install a more recent version.
+PostgreSQL 9.6 and later are available natively on CentOS 8.2. If using an earlier CentOS release, you may need to [install it from an RPM](https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/).
 
 ```no-highlight
-sudo yum install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm
-sudo yum install -y postgresql96 postgresql96-server postgresql96-devel
-sudo /usr/pgsql-9.6/bin/postgresql96-setup initdb
+sudo yum install -y postgresql-server libpq-devel
+sudo postgresql-setup --initdb
 ```
 
-CentOS users should modify the PostgreSQL configuration to accept password-based authentication by replacing `ident` with `md5` for all host entries within `/var/lib/pgsql/9.6/data/pg_hba.conf`. For example:
+CentOS configures ident host-based authentication for PostgreSQL by default. Because NetBox will need to authenticate using a username and password, modify `/var/lib/pgsql/data/pg_hba.conf` to support MD5 authentication by changing `ident` to `md5` for the lines below:
 
 ```no-highlight
 host    all             all             127.0.0.1/32            md5
@@ -36,8 +35,8 @@ host    all             all             ::1/128                 md5
 Then, start the service and enable it to run at boot:
 
 ```no-highlight
-sudo systemctl start postgresql-9.6
-sudo systemctl enable postgresql-9.6
+sudo systemctl start postgresql
+sudo systemctl enable postgresql
 ```
 
 ## Database Creation

docs/installation/2-redis.md

@@ -16,7 +16,6 @@ sudo apt install -y redis-server
 ### CentOS
 
 ```no-highlight
-sudo yum install -y epel-release
 sudo yum install -y redis
 sudo systemctl start redis
 sudo systemctl enable redis

docs/installation/3-netbox.md

@@ -18,8 +18,7 @@ sudo apt install -y python3.6 python3-pip python3-venv python3-dev build-essenti
 ### CentOS
 
 ```no-highlight
-sudo yum install -y gcc python36 python36-devel python36-setuptools libxml2-devel libxslt-devel libffi-devel openssl-devel redhat-rpm-config
-sudo easy_install-3.6 pip
+sudo yum install -y gcc python36 python36-devel python3-pip libxml2-devel libxslt-devel libffi-devel openssl-devel redhat-rpm-config
 ```
 
 Before continuing with either platform, update pip (Python's package management tool) to its latest release:
@@ -37,10 +36,10 @@ This documentation provides two options for installing NetBox: from a downloadab
 Download the [latest stable release](https://github.com/netbox-community/netbox/releases) from GitHub as a tarball or ZIP archive and extract it to your desired path. In this example, we'll use `/opt/netbox` as the NetBox root.
 
 ```no-highlight
-# wget https://github.com/netbox-community/netbox/archive/vX.Y.Z.tar.gz
-# tar -xzf vX.Y.Z.tar.gz -C /opt
-# ln -s /opt/netbox-X.Y.Z/ /opt/netbox
-# ls -l /opt | grep netbox
+$ sudo wget https://github.com/netbox-community/netbox/archive/vX.Y.Z.tar.gz
+$ sudo tar -xzf vX.Y.Z.tar.gz -C /opt
+$ sudo ln -s /opt/netbox-X.Y.Z/ /opt/netbox
+$ ls -l /opt | grep netbox
 lrwxrwxrwx  1 root root         13 Jul 20 13:44 netbox -> netbox-2.9.0/
 drwxr-xr-x  2 root root       4096 Jul 20 13:44 netbox-2.9.0
 ```
@@ -73,7 +72,7 @@ sudo yum install -y git
 Next, clone the **master** branch of the NetBox GitHub repository into the current directory. (This branch always holds the current stable release.)
 
 ```no-highlight
-sudo git clone -b master https://github.com/netbox-community/netbox.git .
+$ sudo git clone -b master https://github.com/netbox-community/netbox.git .
 Cloning into '.'...
 remote: Counting objects: 1994, done.
 remote: Compressing objects: 100% (150/150), done.

docs/installation/index.md

@@ -1,6 +1,6 @@
 # Installation
 
-The installation instructions provided here have been tested to work on Ubuntu 20.04 and CentOS 7.5. The particular commands needed to install dependencies on other distributions may vary significantly. Unfortunately, this is outside the control of the NetBox maintainers. Please consult your distribution's documentation for assistance with any errors.
+The installation instructions provided here have been tested to work on Ubuntu 20.04 and CentOS 8.2. The particular commands needed to install dependencies on other distributions may vary significantly. Unfortunately, this is outside the control of the NetBox maintainers. Please consult your distribution's documentation for assistance with any errors.
 
 The following sections detail how to set up a new instance of NetBox: