Real World DevStack Configuration

| categories: devstack

Configuring DevStack for development use is a trail of Google searches and reading and all sorts of things. In my experience, the best and hardest source of what to do is experience. And we all know how experience is the bridge between Bad Judgement and Good Judgement.[]


This is DevStack's configuration file. It will never be modified by DevStack.


Now just a section in local.conf, localrc used to be the main config file. References to it should be mentally translated to local.conf [[local|localrc]] section.

I also tend to carry a number of config bits commented out to make changing quick. I'll leave those in to illustrate alternatives to my defaults.


LOGFILE=$LOGDIR/  # why didn't bare name work???

The logging support has been recently revamped to use a more conventional configuration. LOGDIR will default to $DEST/logs and all log files will be found here. LOGFILE will be honored as always, putting the trace log in that location; if LOGFILE does not include a path, it becomes $LOGDIR/$LOGFILE.

The services logs (aka screen logs) no longer default to a screen-specific subdirectory, unless SCREEN_LOGDIR is set. It is deprecated and will be removed in the future.

Network Addressing


Set FIXED_RANGE away from the default because, well, many clouds use 10/8 for various things and some of them start at the beginning. Running DevStack in a cloud VM requires that the DevStack network addresses do not overlap with the host cloud networks. Pick a range that isn't at the top or the bottom to (slightly) reduce the chances of collision. This is safe for the neighborhoods I cloud in.


For my normal workflow, I want debugging bits enabled and services I am not using disabled.

enable_service dstat
disable_service h-eng h-api h-api-cfn h-api-cw
disable_service horizon
#enable_service s-proxy s-object s-container s-account

I typically don't use Heat or Horizon, you know, being the CLI guy and all. Swift is not added by default because it takes a toll on memory use, my laptop is not well-endowed in that area so 2G VMs are necessary whenever possible. In the cloud VMs this is not an issue.


# Nova Net
enable_service n-net
disable_Service q-svc q-agt q-dhcp q-l3 q-meta

# Neutron
# NETWORK_GATEWAY must be in the FIXED_RANGE network
#disable_service n-net
#enable_service q-svc q-agt q-dhcp q-l3 q-meta

Neutron may or may not be the default in DevStack by the time you read this, I've stopped taking chances, I want to know what I get, which by default is Nova Net for as long as possible, again mostly for memory and complexity reasons.

Note that Neutron in the default config requires NETWORK_GATEWAY to be set inside the network defined by FIXED_RANGE. Nova Net does not require this, although it is mostly harmless to define anyway.

Legacy Nova Bits

disable_service n-obj n-crt

n-obj is the Nova Object Service, left over from the euca2ools bundle command's need of an S3 service. That's it. Same with n-crt. They should be removed as defaults soon if not already.


Set values here via local.conf:

api_rate_limit = False

Rate limiting can be a problem during testing, nuke it.