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cherry pick from 1.2 #4535 (#4542) 

remove this tip as this is not needed #4535
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Lin Sun 2019-06-24 11:48:32 -04:00 committed by mergify[bot]
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content/docs/setup/kubernetes/additional-setup/sidecar-injection/index.md
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@ -40,14 +40,6 @@ $ istioctl kube-inject -f @samples/sleep/sleep.yaml@ | kubectl apply -f -
Alternatively, inject using local copies of the configuration.
{{< tip >}}
The `istioctl kube-inject` operation may not be repeated on the output
from a previous `kube-inject`. The `kube-inject` operation is not idempotent.
For upgrade purposes, if using manual injection, it is recommended to keep
the original non-injected `yaml` file so that the data plane sidecars may be
updated.
{{< /tip >}}
{{< text bash >}}
$ kubectl -n istio-system get configmap istio-sidecar-injector -o=jsonpath='{.data.config}' > inject-config.yaml
$ kubectl -n istio-system get configmap istio -o=jsonpath='{.data.mesh}' > mesh-config.yaml