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Getting Started with Nova
=========================
GOTTA HAVE A nova.pth file added or it WONT WORK (will write setup.py file soon)
Create a file named nova.pth in your python libraries directory
(usually /usr/local/lib/python2.6/dist-packages) with a single line that points
to the directory where you checked out the source (that contains the nova/
directory).
DEPENDENCIES
------------
Related servers we rely on
* RabbitMQ: messaging queue, used for all communication between components
* OpenLDAP: users, groups (maybe cut)
* ReDIS: Remote Dictionary Store (for fast, shared state data)
* nginx: HTTP server to handle serving large files (because Tornado can't)
Python libraries we don't vendor
* M2Crypto: python library interface for openssl
* curl
Vendored python libaries (don't require any installation)
* Tornado: scalable non blocking web server for api requests
* Twisted: just for the twisted.internet.defer package
* boto: python api for aws api
* IPy: library for managing ip addresses
Recommended
-----------------
* euca2ools: python implementation of aws ec2-tools and ami tools
* build tornado to use C module for evented section
Installation
--------------
::
# system libraries and tools
apt-get install -y aoetools vlan curl
modprobe aoe
# python libraries
apt-get install -y python-setuptools python-dev python-pycurl python-m2crypto
# ON THE CLOUD CONTROLLER
apt-get install -y rabbitmq-server dnsmasq nginx
# build redis from 2.0.0-rc1 source
# setup ldap (slap.sh as root will remove ldap and reinstall it)
NOVA_PATH/nova/auth/slap.sh
/etc/init.d/rabbitmq-server start
# ON VOLUME NODE:
apt-get install -y vblade-persist
# ON THE COMPUTE NODE:
apt-get install -y python-libvirt
apt-get install -y kpartx kvm libvirt-bin
modprobe kvm
# optional packages
apt-get install -y euca2ools
Configuration
---------------
ON CLOUD CONTROLLER
* Add yourself to the libvirtd group, log out, and log back in
* fix hardcoded ec2 metadata/userdata uri ($IP is the IP of the cloud), and masqurade all traffic from launched instances
::
iptables -t nat -A PREROUTING -s 0.0.0.0/0 -d 169.254.169.254/32 -p tcp -m tcp --dport 80 -j DNAT --to-destination $IP:8773
iptables --table nat --append POSTROUTING --out-interface $PUBLICIFACE -j MASQUERADE
* Configure NginX proxy (/etc/nginx/sites-enabled/default)
::
server {
listen 3333 default;
server-name localhost;
client_max_body_size 10m;
access_log /var/log/nginx/localhost.access.log;
location ~ /_images/.+ {
root NOVA_PATH/images;
rewrite ^/_images/(.*)$ /$1 break;
}
location / {
proxy_pass http://localhost:3334/;
}
}
ON VOLUME NODE
* create a filesystem (you can use an actual disk if you have one spare, default is /dev/sdb)
::
# This creates a 1GB file to create volumes out of
dd if=/dev/zero of=MY_FILE_PATH bs=100M count=10
losetup --show -f MY_FILE_PATH
# replace loop0 below with whatever losetup returns
echo "--storage_dev=/dev/loop0" >> NOVA_PATH/bin/nova.conf
Running
---------
Launch servers
* rabbitmq
* redis
* slapd
* nginx
Launch nova components
* nova-api
* nova-compute
* nova-objectstore
* nova-volume
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