nova/docs/getting.started.rst

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
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

# 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
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