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Elasticsearch and Kibana only support CentOS 8 from version 6.x, but in
Train Kolla uses ELK 5.x.
This change adds new elasticsearch6 and kibana6 images based on ELK 6.x
only for CentOS 7 and 8. This enables two things:
1. provide elasticsearch and kibana for CentOS 8 in Train
2. provide a migration path from CentOS 7 to 8 that does not involve a
simultaneous major upgrade, by first upgrading CentOS 7 to ELK 6.x.
The new images are based on the upgrade to 6.x in Ussuri in
I8b52b2630a72393bf4b9c7095fc67db6c36c27fa.
This includes a switch to start using oss tagged binaries. These
binaries contain only features that are available under the Apache 2.0
license.
Related: blueprint elasticsearch-kibana-version-upgrade
Co-authored-by: Dincer Celik <hello@dincercelik.com>
Change-Id: I8b52b2630a72393bf4b9c7095fc67db6c36c27fa
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