Just some instructions to remind myself how I got the Minecraft Overviewer working on CentOS.
wget http://overviewer.org/builds/el6-64/7/overviewer-0.12.109.rpm yum install overviewer-0.12.109.rpm VERSION=1.9 wget https://s3.amazonaws.com/Minecraft.Download/versions/${VERSION}/${VERSION}.jar -P ~/.minecraft/versions/${VERSION}/
Now create a config file to tell Overviewer where the assets (texture images etc) are:
vi overviewer_config
texturepath = "/home/jonny/.minecraft/versions/1.9/1.9.jar"
Then run Overviewer telling it the location of your config file:
overviewer.py /opt/minecraft/world /opt/minecraft/mymcmap
After some time the overviewer map should be created. The map can be added to a web accessible directory for global viewing or copied locally for offline viewing.