openstack/ironic-inspector
Code Issues Proposed changes

Recommend using dhcp-sequential-ip in the dnsmasq configuration

Browse Source 
Introspection naturally happens in large bulks, after which it's inactive.
Small pool for DHCP addresses means that we'll have conflicts due to how
dnsmasq distributes them by default - using hashing. This option tells dnsmasq
to allocate IP addresses sequentially instead to avoid these conflicts.
See https://bugzilla.redhat.com/show_bug.cgi?id=1301659 for detailed analysis.

The drawback of this option is that long-running clients may switch IP
addresses if their lease expires. This is not a concern for short introspection
process.

This change may obsolete the need in the delay between 2 introspections.

Change-Id: Id277f3d31902bee16d3b048dbde5c34af905f0bc
This commit is contained in:
Dmitry Tantsur 2016-03-02 11:50:34 +01:00
parent e8ecb99122
commit 2f8e105b4b
2 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
devstack/plugin.sh
View File

@ -224,6 +224,7 @@ interface=$IRONIC_INSPECTOR_INTERFACE
bind-interfaces
dhcp-range=$IRONIC_INSPECTOR_DHCP_RANGE
dhcp-boot=pxelinux.0
dhcp-sequential-ip
EOF
}

6
doc/source/install.rst
View File

@ -125,6 +125,12 @@ As for PXE boot environment, you'll need:
enable-tftp
tftp-root={TFTP ROOT, e.g. /tftpboot}
dhcp-boot=pxelinux.0
dhcp-sequential-ip
.. note::
``dhcp-sequential-ip`` is used because otherwise a lot of nodes booting
simultaneously cause conflicts - the same IP address is suggested to
several nodes.
* You have to install and configure one of 2 available ramdisks: simple
bash-based (see `Using simple ramdisk`_) or more complex based on