[BUG] shenyu boostrap dns server is null in some pods

[misaya295]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

1.use shenyu2.5.1
2.docker images alpine
3.some pod report unknown host or requert time too long
4.in kubernetes

Expected Behavior

No response

Steps To Reproduce

No response

Environment

ShenYu version(s):2.5.1

Debug logs

Caused by: io.netty.resolver.dns.DnsResolveContext$SearchDomainUnknownHostException: Failed to resolve 'third-estuary-api-svc' and search domain query for configured domains failed as well: [data-estuary-pro.svc.cluster.local, svc.cluster.local, cluster.local

Anything else?

link
https://kubernetes.io/zh-cn/docs/tasks/administer-cluster/dns-debugging-resolution/#known-issues
kubernetes/kubernetes#30215

No response