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Add upgrade notes about 1.7.x to 1.8 regarding http 1xx and 204. (#8785)

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Pengyuan Bian 2021-01-21 20:47:34 +00:00 committed by GitHub
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content/en/news/releases/1.8.x/announcing-1.8/upgrade-notes/index.md
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@ -134,3 +134,7 @@ ingressGateways:
- name: ISTIO_META_ROUTER_MODE
value: "sni-dnat"
{{< /text >}}
## Connectivity issues among your proxies when updating from 1.7.x (where x < 5)
When upgrading your Istio data plane from 1.7.x (where x < 5) to 1.8, you may observe connectivity issues between your gateway and your sidecars or among your sidecars with 503 errors in the log. This happens when 1.7.5+ proxies send HTTP 1xx or 204 response codes with headers that 1.7.x proxies reject. To fix this, upgrade all your proxies (gateways and sidecars) to 1.7.5+ as soon as possible. ([Issue 29427](https://github.com/istio/istio/issues/29427), [More information](https://github.com/istio/istio/pull/28450))