Add optional TLS feature to gRPC servers #8176
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Implement TransportCredentials that allows a server to accept both TLS and plain-text connections at the same time on the same endpoint. To detect a connection type TransportCredentials inspects the first 6 bytes read from a socket and compares them against bytes in TLS prefix. A TLS prefix is different from plain-text HTTP2 prefix. Signed-off-by: Anton Tiurin <noxiouz@yandex.ru>
use go/vt/tlstest to generate certificates log warning message when the option is on Signed-off-by: Anton Tiurin <noxiouz@yandex.ru>
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May 26, 2021
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Description
Implement TransportCredentials that allows a gRPC server to accept both
TLS and plain-text connections at the same time on the same endpoint.
This feature is vital to migrating Vitess cluster in production from plain-text to TLS without downtime.
As Vitess components talk to each other via gRPC, currently, it's not possible to do a rolling update:
With the optional TLS feature this update is possible in 3 steps without downtime:
To detect a connection type TransportCredentials inspects the first 6 bytes read from a socket and compares them with TLS prefix. TLS prefix is different from plain-text HTTP2 prefix.
Originally implemented as a separate gRPC package: go-grpc-optionaltls-creds
Related Issue(s)
Backport of #8049
Checklist