4e5dcdd9cf
While we already clean a number of things off the ironic-agent ramdisk, there are a few more significant ones that we should add to the list. First is the kernel source. If you're rebuilding your kernel on the agent ramdisk after the initial image build, then you need to re-examine your life choices. ;-) Second is /var/cache. On yum-based distros, this contains a large number of yum cache files that take up significant space. We don't really want to be copying around caches when booting a ramdisk anyway, so cleaning this is the right thing to do regardless. Third is all *.pyc or *.pyo files. There are a lot of these, so they eat up significant space and bloat the number of files in the ramdisk, which makes it take longer to build. the only purpose for the files is to slightly speed up Python app startup, and we probably lose more time transferring the files over the network than we would gain in quicker start times. Note that we were already trying to remove these, but for some reason I was still seeing them show up in my final images. It makes more sense to put them in the same pruning command as all the others anyway. Fourth is /usr/include. These are files only needed for compilation. See above for my thoughts on compiling in a ramdisk. These changes have reduced the agent ramdisk from 391 MB to 333 MB in my local centos 7 builds, and have reduced the number of files in the ramdisk by over 18000. Change-Id: I550f9904b9afd12d48da9ba24559acb23133d076
ironic-agent
- Builds a ramdisk with ironic-python-agent. More information can be found at:
-
https://git.openstack.org/cgit/openstack/ironic-python-agent/
Beyond installing the ironic-python-agent, this element does the following:
- Installs the
dhcp-all-interfacesso the node, upon booting, attempts to obtain an IP address on all available network interfaces. - Disables the
iptablesservice on SysV and systemd based systems. - Disables the
ufwservice on Upstart based systems. - Installs packages required for the operation of the ironic-python-agent::
-
qemu-utilspartedhdparmutil-linuxgenisoimage
- When installing from source,
python-devandgccare also installed in order to support source based installation of ironic-python-agent and its dependencies. - Install the certificate if any, which is set to the environment
variable
DIB_IPA_CERTfor validating the authenticity by ironic-python-agent. The certificate can be self-signed certificate or CA certificate.
This element outputs three files:
$IMAGE-NAME.initramfs: The deploy ramdisk file containing the ironic-python-agent (IPA) service.$IMAGE-NAME.kernel: The kernel binary file.$IMAGE-NAME.vmlinuz: A hard link pointing to the$IMAGE-NAME.kernelfile; this is just a backward compatibility layer, please do not rely on this file.
Note
The package based install currently only enables the service when using the systemd init system. This can easily be changed if there is an agent package which includes upstart or sysv packaging.
Note
Using the ramdisk will require at least 1.5GB of ram