[FLINK-39787][build] Map runner hostname to loopback to avoid SSL SAN mismatch#117
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MartijnVisser merged 2 commits intoMay 28, 2026
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… mismatch GitHub-hosted Azure runners assign a VM hostname whose reverse DNS returns an internal cloudapp.net FQDN. flink-runtime's SSL test certificate (local127.keystore) lists only 'localhost', '127.0.0.1', and '::1' as SANs, so the SSL handshake in StreamNetworkThroughputBenchmark fails and the benchmark hangs until GitHub kills the job at the 6h timeout. Prepend a loopback mapping for the runner hostname to /etc/hosts so InetAddress.getLocalHost() (used by StreamNetworkBenchmarkEnvironment to bind the NettyServer) returns 127.0.0.1; reverse DNS on that IP then yields 'localhost', which matches the certificate.
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GitHub-hosted Azure runners assign a VM hostname whose reverse DNS returns an internal cloudapp.net FQDN. flink-runtime's SSL test certificate (local127.keystore) lists only 'localhost', '127.0.0.1', and '::1' as SANs, so the SSL handshake in
StreamNetworkThroughputBenchmark fails and the benchmark hangs until GitHub kills the job at the 6h timeout.
Prepend a loopback mapping for the runner hostname to /etc/hosts so InetAddress.getLocalHost() (used by StreamNetworkBenchmarkEnvironment to bind the NettyServer) returns 127.0.0.1; reverse DNS on that IP then yields 'localhost', which matches the certificate.