openstack
/
heat-agents
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heat-agents/heat-config-kubelet
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Martin André 9ce538b6ff Prevent trailing whitespace in rendered JSON 
On python <3.4 the separator for json.dump() defaulted to (', ', ': ')
which may cause trailing whitespaces in rendered JSON files when used
with indent. This change sets the separator to (',', ': ') to prevent
trailing whitespaces with older versions of python.

See https://docs.python.org/2/library/json.html#basic-usage

Change-Id: I81fabd54659bdb28da43fb4900f19dd94a70336c
 		2017-01-13 12:07:51 +01:00
..
extra-data.d Move elements at the top level 2017-01-04 16:57:10 +01:00
install.d Move elements at the top level 2017-01-04 16:57:10 +01:00
os-refresh-config/configure.d Prevent trailing whitespace in rendered JSON 2017-01-13 12:07:51 +01:00
README.rst Move elements at the top level 2017-01-04 16:57:10 +01:00
element-deps Move elements at the top level 2017-01-04 16:57:10 +01:00

README.rst

This hook uses the kubelet agent from the kubernetes project to provision containers. The StructuredConfig resource data represents a pod of containers to be provisioned.

The files have the following purpose:

  • extra-data.d/50-docker-images allows an archive file of docker images to be included in the dib image
  • install.d/50-heat-config-kubelet installs kubernetes for redhat based distros during dib image build, along with the required systemd and config files required to enable a working kubelet service on the host
  • install.d/hook-kubelet.py polls docker images and containers until the expected kubelet-provisioned containers are running (or a timeout occurs)
  • os-refresh-config/configure.d/50-heat-config-kubelet runs before 55-heat-config (and the kubelet hook it triggers). This orc script writes out all pod definition files for the pods that should currently be running. Kubelet is configured to monitor the directory containing these files, so the current running containers will change when kubelet acts on these config changes