Unable to open Istio ingress-gateway for gRPC
I am starting to understand I can't open port 8081 using the default istio ingress gateway. That service does not expose that port, and I was assuming creating a gateway would update the service "under the hood" but that's not the case. The external ports that I can pick from are: 80, 443, 31400, 15443, 15021 and I think my gateway needs to rely only on those. I've updated my gateway and virtual service to use port 80 and the client then connects to the server just fine.
I'm not sure how exactly did you try to add custom port for ingress gateway but it's possible.
As far as I checked here it's possible to do in 3 ways, here are the options with links to examples provided by @A_Suh, @Ryota and @peppered.
Additional resources:
That means I have to differentiate between multiple services not by port (can't route from the same port to two services obviously), but by SNI, and I'm unclear how to do that in gRPC, I'm guessing I can add a Host:[hostname] in the gRPC header. Unfortunately, if that's how I can route, it means headers need to be read on the gateway, and that mandates terminating TLS at the gateway when I was hoping to terminate at the pod.
I see you have already create new question here, so let's just move there.
I have added the port to ingress gateway successfully, but still I couldn't get client connected to server. For me too, port-forwarding works, but when I try to connected through ingress getting below error. Here istio ingressgateway is on GKE, so it's using global HTTPS load balancer.
Jun 14, 2021 8:28:08 PM com.manning.mss.ch12.grpc.sample01.InventoryClient updateInventoryWARNING: RPC failed: Status{code=INTERNAL, description=http2 exception, cause=io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2Exception: First received frame was not SETTINGS. Hex dump for first 5 bytes: 485454502fat io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2Exception.connectionError(Http2Exception.java:85)at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler$PrefaceDecoder.verifyFirstFrameIsSettings(Http2ConnectionHandler.java:350)at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler$PrefaceDecoder.decode(Http2ConnectionHandler.java:251)at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler.decode(Http2ConnectionHandler.java:450)at io.grpc.netty.shaded.io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:502)at io.grpc.netty.shaded.io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:441)at io.grpc.netty.shaded.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:278)at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345)at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:337)at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1408)at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345)at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:930)at io.grpc.netty.shaded.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:677)at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:612)at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:529)at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:491)at io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:905)at io.grpc.netty.shaded.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)at java.lang.Thread.run(Thread.java:748)