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GRPC port forwarding hangs when using mysql connection #2968

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balajiv113 opened this issue Dec 3, 2024 · 2 comments · May be fixed by #2985
Open

GRPC port forwarding hangs when using mysql connection #2968

balajiv113 opened this issue Dec 3, 2024 · 2 comments · May be fixed by #2985
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area/portfwd bug Something isn't working

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@balajiv113
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Description

Steps to reproduce

  • Run limactl start --name=lima-vz --vm-type=vz --mount-type=virtiofs template://docker
  • Run docker run --detach --name mariadb -p 127.0.0.1:10099:3606 --env MARIADB_DATABASE=db --env MARIADB_ROOT_PASSWORD=root mariadb:latest --port 3606
  • Run mysql -uroot -proot --database=db --host=127.0.0.1 --port=10099 -e "SHOW TABLES;" from host and notice it hangs
  • Same running from guest works

Note: Identified this issue by running ddev tests
@balajiv113 balajiv113 added bug Something isn't working area/portfwd labels Dec 3, 2024
@nirs
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nirs commented Dec 3, 2024

@balajiv113 can this be related to #2970?

@balajiv113
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I don't think so, as its TCP connection in our case

What's happening with mysql is,
As soon connection is established,

  • Host accepts a TCP connection
  • Starts a tunnel
  • Sends empty data via tunnel (Implemented now, to start tunnel on guest as well)
  • Once tunnel msg is received on guest, it does a dial
  • Start io.copy in guest. For some reason this immediately fails with no error but just says 0 read and error is nil

I have done a change to support retry in these cases
master...balajiv113:lima:grpc-hangs

This works but need to see why it's failing in first place

@balajiv113 balajiv113 linked a pull request Dec 6, 2024 that will close this issue
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Revamp GRPC Port forwarding tunnels to use existing proxy balajiv113/lima
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@nirs @balajiv113