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Levin Zimmermann
neoppod
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c56ffe39
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c56ffe39
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Sep 09, 2011
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Julien Muchembled
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NEO is a distributed, redundant and scalable implementation of ZODB API.
NEO is a distributed, redundant and scalable implementation of ZODB API.
NEO stands for Nexedi Enterprise Object.
NEO stands for Nexedi Enterprise Object.
Requirements
- Linux 2.6 or later
- Python 2.4 or later
- For python 2.4: ctypes http://python.net/crew/theller/ctypes/
(packaged with later python versions)
Note that setup.py does not define any dependency to 'ctypes' so you will
have to install it explicitely.
- MySQLdb http://sourceforge.net/projects/mysql-python
- ZODB 3.10 or later (requires python 2.5 or later, only for client nodes)
Overview
Overview
========
A NEO cluster is composed of the following types of nodes:
A NEO cluster is composed of the following types of nodes:
- "master" nodes (mandatory, 1 or more)
- "master" nodes (mandatory, 1 or more)
Takes care of transactionality. Only one master node is really active
Takes care of transactionality. Only one master node is really active
(the active master node is called "primary master") at any given time,
(the active master node is called "primary master") at any given time,
extra masters are spares (they are called "secondary masters").
extra masters are spares (they are called "secondary masters").
- "storage" nodes (mandatory, 1 or more)
- "storage" nodes (mandatory, 1 or more)
Stores data in a MySQL database. All available storage nodes are in use
Stores data in a MySQL database. All available storage nodes are in use
simultaneously. This offers redundancy and data distribution.
simultaneously. This offers redundancy and data distribution.
- "admin" nodes (mandatory for startup, optional after)
- "admin" nodes (mandatory for startup, optional after)
Accepts commands from neoctl tool and transmits them to the
Accepts commands from neoctl tool and transmits them to the
primary master, and monitors cluster state.
primary master, and monitors cluster state.
- "client" nodes
- "client" nodes
Well... Something needing to store/load data in a NEO cluster.
Well... Something needing to store/load data in a NEO cluster.
Disclaimer
Disclaimer
==========
In addition of the disclaimer contained in the licence this code is
released under, please consider the following.
NEO does not implement any authentication mechanism between its nodes, and
does not encrypt data exchanged between nodes either.
If you want to protect your cluster from malicious nodes, or your data from
being snooped, please consider encrypted tunelling (such as openvpn).
Requirements
============
- Linux 2.6 or later
In addition of the disclaimer contained in the licence this code is
- Python 2.4 or later
released under, please consider the following.
NEO does not implement any authentication mechanism between its nodes, and
- For python 2.4: ctypes http://python.net/crew/theller/ctypes/
does not encrypt data exchanged between nodes either.
(packaged with later python versions)
If you want to protect your cluster from malicious nodes, or your data from
Note that setup.py does not define any dependency to 'ctypes' so you will
being snooped, please consider encrypted tunelling (such as openvpn).
have to install it explicitely.
- MySQLdb http://sourceforge.net/projects/mysql-python
- ZODB 3.10 or later (requires python 2.5 or later, only for client nodes)
Installation
Installation
============
a. Make neo directory available for python to import (for example, by
a. Make neo directory available for python to import (for example, by
adding its container directory to the PYTHONPATH environment variable).
adding its container directory to the PYTHONPATH environment variable).
b. Choose a cluster name and setup a MySQL database
b. Choose a cluster name and setup a MySQL database
c. Start all required nodes
:
c. Start all required nodes:
:
neomaster --cluster=<cluster name>
neomaster --cluster=<cluster name>
neostorage --cluster=<cluster name> --database=user:passwd@host
neostorage --cluster=<cluster name> --database=user:passwd@host
neoadmin --cluster=<cluster name>
neoadmin --cluster=<cluster name>
d. Tell the cluster it can provide service.
d. Tell the cluster it can provide service::
neoctl start
neoctl start
How to use
How to use
==========
1. In zope:
In zope
-------
a. Copy neo directory to /path/to/your/zope/lib/python
a. Copy neo directory to /path/to/your/zope/lib/python
b. Edit your zope.conf, add a neo import and edit the `zodb_db` section by
b. Edit your zope.conf, add a neo import and edit the `zodb_db` section by
replacing its filestorage subsection by a NEOStorage one.
replacing its filestorage subsection by a NEOStorage one.
It should look like
:
It should look like:
:
%import neo.client
%import neo.client
<zodb_db main>
<zodb_db main>
...
@@ -83,15 +93,16 @@ How to use
...
@@ -83,15 +93,16 @@ How to use
mount-point /
mount-point /
</zodb_db>
</zodb_db>
c. Start zope
c. Start zope
2. In a python script:
In a Python script
------------------
a. Set your PYTHONPATH in order to be able to import Zope lib
:
a. Set your PYTHONPATH in order to be able to import Zope lib:
:
$ export PYTHONPATH=/path/to/your/zope/lib/python:$PYTHONPATH
$ export PYTHONPATH=/path/to/your/zope/lib/python:$PYTHONPATH
b. Just create the storage object and play with it
:
b. Just create the storage object and play with it:
:
from neo.client.Storage import Storage
from neo.client.Storage import Storage
s = Storage(master_nodes="127.0.0.1:10010", name="main")
s = Storage(master_nodes="127.0.0.1:10010", name="main")
...
@@ -100,26 +111,26 @@ How to use
...
@@ -100,26 +111,26 @@ How to use
"name" and "master_nodes" parameters have the same meaning as in
"name" and "master_nodes" parameters have the same meaning as in
configuration file.
configuration file.
Deployment:
Deployment
==========
NEO has no built-in deployment features such as process daemonization. We use
NEO has no built-in deployment features such as process daemonization. We use
supervisor with configuration like below:
supervisor with configuration like below::
[group:neo]
programs=master_01,storage_01,admin
[program:master_01]
[group:neo]
priority=1
programs=master_01,storage_01,admin
command=neomaster -c neo -s master_01 -f /neo/neo.conf
user=neo
[program:storage
_01]
[program:master
_01]
priority=2
priority=1
command=neostorage -c neo -s storage
_01 -f /neo/neo.conf
command=neomaster -c neo -s master
_01 -f /neo/neo.conf
user=neo
user=neo
[program:admin
]
[program:storage_01
]
priority=3
priority=2
command=neoadmin -c neo -s admin
-f /neo/neo.conf
command=neostorage -c neo -s storage_01
-f /neo/neo.conf
user=neo
user=neo
[program:admin]
priority=3
command=neoadmin -c neo -s admin -f /neo/neo.conf
user=neo
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