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https://issues.apache.org/jira/browse/FLINK-29572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17628839#comment-17628839
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Weihua Hu commented on FLINK-29572:
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Hi, @songxintong, I think this was introduced by FLINK-24474. It uses the
loopback address as the default address. In these configs, it only supports
flink clusters running on a single host, and taskmanager must use the loopback
interface to connect with the jobmanager, since the jobmanager only binds the
loopback interface. But if we don't set the bind-address to localhost,
taskmanager should not use the loopback interface to find its external address.
otherwise, this will cause other TaskManagers to not connect with it.
This cause [FLINK-27341|https://issues.apache.org/jira/browse/FLINK-27341] too.
IMO, we can determine whether to use the loopback interface by whether the
taskmanager.bind-host is loopback address.
> Flink Task Manager skip loopback interface for resource manager registration
> ----------------------------------------------------------------------------
>
> Key: FLINK-29572
> URL: https://issues.apache.org/jira/browse/FLINK-29572
> Project: Flink
> Issue Type: Bug
> Components: API / Core
> Affects Versions: 1.15.2
> Environment: Flink 1.15.2
> Kubernetes with Istio Proxy
> Reporter: Kevin Li
> Priority: Major
>
> Currently Flink Task Manager use different local interface to bind to connect
> to Resource Manager. First one is Loopback interface. Normally if Job Manager
> is running on remote host/container, using loopback interface to connect will
> fail and it will pick up correct IP address.
> However, if Task Manager is running with some proxy, loopback interface can
> connect to remote host as well. This will result 127.0.0.1 reported to
> Resource Manager during registration, even Job Manager/Resource Manager runs
> on remote host, and problem will happen. For us, only one Task Manager can
> register in this case.
> I suggest adding configuration to skip Loopback interface check if we know
> Job/Resource Manager is running on remote host/container.
>
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