Zope/Plone code reload after deployment on production - deployment

Question

Is there a way to reload the code without restarting Zope when in Production ?
New features are implemented almost once in 2 days and have to be uploaded to the server. The only way it works currently is by restarting the zeo server and all instances. Can't use "plone.reload" as it only works in the development environment when the debug mode is on. Below is the buildout.cfg content
[buildout]
parts =
# instance
zeo
client1
client2
client3
zopepy
zopeskel
test
# mysql
# varnish-build
# varnish
supervisor
pidproxy
extends =
https://dist.plone.org/versions/zope-2-13-19-versions.cfg
find-links =
https://dist.plone.org/release/4.2.4
https://dist.plone.org/thirdparty
extensions =
mr.developer
# buildout.dumppickedversions
sources = sources
versions = versions
develop =
[versions]
plone.recipe.zeoserver = 1.3.1
plone.recipe.zope2instance = 4.2.8
five.localsitemanager = 2.0.5
Products.PluginRegistry = 1.3
Products.CMFCore = 2.2.7
Products.GenericSetup = 1.7.3
Products.ZSQLMethods = 2.13.4
zope.interface = 3.6.7
zope.app.publication = 3.12.0
#setuptools = 17.1.1
funcsigs = 0.4
openpyxl = 2.4.0
plone.reload = 2.0.2
[zeo]
recipe = plone.recipe.zeoserver
zeo-address = 127.0.0.1:9100
zeo-var = ${buildout:directory}/var
blob-storage = ${zeo:zeo-var}/blobstorage
#ggs = plone.app.blob
[client1]
recipe = plone.recipe.zope2instance
http-address = 9081
zeo-client = on
zeo-address = ${zeo:zeo-address}
shared-blob = on
blob-storage = ${zeo:zeo-var}/blobstorage
user = admin:Slick_RP#21!
products = ${buildout:directory}/matrix_git/prod/
debug-mode = off
verbose-security = off
eggs =
# pillow
mysql-python
simplejson
haversine
openpyxl
requests
httpagentparser
ordereddict
python-memcached
# python-crontab
# setuptools
Products.CMFCore
Products.ZMySQLDA
# Products.SQLAlchemyDA
Products.PluggableAuthService
# Products.ZopeProfiler
# Products.MemoryProfiler
# reportlab
Products.BeakerSessionDataManager
collective.fsexternalmethod
plone.reload
zope-conf-additional =
extensions ${buildout:directory}/matrix_git/Extensions
<product-config beaker>
session.type file
session.data_dir ${buildout:directory}/var/sessions/data
session.lock_dir ${buildout:directory}/var/sessions/lock
session.key beaker.session
session.secret secret
</product-config>
zcml =
collective.fsexternalmethod
plone.reload
event-log-max-size = 5 MB
event-log-old-files = 5
access-log-max-size = 20 MB
access-log-old-files = 10
[client2]
recipe = plone.recipe.zope2instance
http-address = 9082
zeo-client = ${client1:zeo-client}
zeo-address = ${client1:zeo-address}
blob-storage = ${client1:blob-storage}
shared-blob = ${client1:shared-blob}
user = ${client1:user}
products = ${client1:products}
debug-mode = off
verbose-security = off
eggs = ${client1:eggs}
zcml = ${client1:zcml}
zope-conf-additional = ${client1:zope-conf-additional}
event-log-max-size = ${client1:event-log-max-size}
event-log-old-files = ${client1:event-log-old-files}
access-log-max-size = ${client1:access-log-max-size}
access-log-old-files = ${client1:access-log-old-files}
[client3]
recipe = plone.recipe.zope2instance
http-address = 9083
zeo-client = ${client1:zeo-client}
zeo-address = ${client1:zeo-address}
blob-storage = ${client1:blob-storage}
shared-blob = ${client1:shared-blob}
user = ${client1:user}
products = ${client1:products}
debug-mode = off
verbose-security = off
eggs = ${client1:eggs}
zcml = ${client1:zcml}
zope-conf-additional = ${client1:zope-conf-additional}
event-log-max-size = ${client1:event-log-max-size}
event-log-old-files = ${client1:event-log-old-files}
access-log-max-size = ${client1:access-log-max-size}
access-log-old-files = ${client1:access-log-old-files}
[zopepy]
recipe = zc.recipe.egg
eggs = ${client1:eggs}
interpreter = zopepy
scripts = zopepy
[test]
recipe = zc.recipe.testrunner
defaults = ['--auto-color', '--auto-progress']
eggs =
${client1:eggs}
[zopeskel]
recipe = zc.recipe.egg
eggs =
ZopeSkel
PasteScript
[mysql]
recipe = zest.recipe.mysql
# Note that these urls usually stop working after a while... thanks...
mysql-url = http://downloads.mysql.com/archives/mysql-5.0/mysql-5.0.86.tar.gz
mysql-python-url = http://pypi.python.org/packages/source/M/MySQL-python/MySQL-python-1.2.3.tar.gz
[varnish-build]
recipe = zc.recipe.cmmi
url = ${varnish:download-url}
[varnish]
recipe = plone.recipe.varnish
daemon = ${buildout:parts-directory}/varnish-build/sbin/varnishd
bind = 127.0.0.1:8000
backends = 127.0.0.1:8080
cache-size = 50M
[pidproxy]
recipe = zc.recipe.egg
eggs = supervisor
scripts = pidproxy
[supervisor]
recipe = collective.recipe.supervisor
port = 127.0.0.1:24007
serverurl = http://127.0.0.1:24007
programs =
# 10 mysql ${buildout:directory}/bin/pidproxy [${buildout:directory}/var/mysql/mysql.pid ${buildout:directory}/parts/mysql/install/bin/mysqld_safe --pid-file=${buildout:directory}/var/mysql/mysql.pid --socket=${buildout:directory}/var/mysql.socket] ${buildout:directory} true
20 zeo ${buildout:directory}/bin/zeo [console] ${buildout:directory} true
30 client1 ${buildout:directory}/bin/client1 [console] ${buildout:directory} true
40 client2 ${buildout:directory}/bin/client2 [console] ${buildout:directory} true
50 client3 ${buildout:directory}/bin/client3 [console] ${buildout:directory} true

Answer 1

If you are deploying so frequently, you can either deploy at low traffic times (i.e. at night).
If the website should be always up, you could have two sets of Plone instances: one set is active and serving requests, the second one is not active.
When updating, the offline servers are updated and when they are done, a switch is turned (HAProxy for example) to replace the active servers.
You could even have all servers available always, but for updating, put some offline while they are updated.
As others, and you as well are pointing, I would never use plone.reload or similar development tools in production.

Answer 2

Yes there is a way, allthough I'd never do that in production it's a great time-saver when developing, to do a reload within a browser-view:
from plone.reload.code import reload_code
from Products.Five.browser import BrowserView
class View(BrowserView):
def __call__(self):
reload_code()
return 'Code loaded.'
Then call the view with the name you registered it with upon the site. This even works in non-debug-mode while the instance is running in background. Tested with a standalone instance (non-ZEO).