Nexus is configured to run with a built-in webserver on port 8070 and keeps its data in /var/lib/nexus.

Install and start Nexus

sudo su -l
cd /opt
wget http://nexus.sonatype.org/downloads/nexus-oss-webapp-1.6.0-bundle.tar.gz (or latest: http://www.sonatype.org/nexus/go/)
tar -zxf nexus-oss-webapp-1.6.0-bundle.tar.gz
useradd -m -s /bin/bash nexus
chown -R nexus:nexus nexus-oss-webapp-1.6.0
ln -s /opt/nexus/bin/jsw/linux-x86-64/nexus /etc/init.d/nexus
vi /etc/init.d/nexus
- change RUN_AS_USER to nexus
vi /opt/nexus/conf/plexus.properties
- change application-port to 8070
- change nexus-work to /var/lib/nexus
- change webapp-context-path to /
mkdir /space/var/lib/nexus
chown nexus:nexus /space/var/lib/nexus
ln -s /space/var/lib/nexus /var/lib/nexus
/etc/init.d/nexus start
Verify it's running by hitting http://localhost:8070/

Set up m2.duraspace.org vhost

Login at m2.duraspace.org as "admin", password "admin123" (this is the default)
You might get an error immediately after logging in. This is because the application url hasn't been set yet.
Set the application URL: Under Administration, Server, scroll down to Application Server Settings, and enter
- Base URL: https://m2.duraspace.org/
- Force Base URL: Enabled (check it)
- Click save
Set a new "admin" password: Under Security, Change Password

On previous host:
- cd /var/lib/nexus/storage
- sudo tar -zcf repos.tgz releases snapshots thirdparty (download repos.tgz)
Copy to new-host:/var/lib/nexus/storage
On new host:
- sudo service nexus stop
- cd /var/lib/nexus/storage
- sudo rm -rf releases snapshots thirdparty
- sudo tar -zxf repos.tgz
- sudo rm repos.tgz
- sudo service nexus start
Login to m2.duraspace.org
Under Repository, for each repository migrated (releases, snapshots, thirdparty):
- Expire cache
- Rebuild metadata
- Reindex

sudo sysv-rc-conf -p
Make it start after slapd and apache (S19, S91), and shutdown before slapd and apache (K80, K09)
- Navigate to down to nexus
- Under columns 1, 0, and 6, type K08
- Under columns 2, 3, 4, and 5, type S92