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Add a note / workaround section to address slow DNS resolution on Mac

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Signed-off-by: Josh Kneubuhl <jkneubuh@us.ibm.com>
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Josh Kneubuhl 2022-05-04 11:43:42 -04:00 committed by Dave Enyeart
parent 47faca36e0
commit 366d162453
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31
test-network-k8s/README.md
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@ -76,3 +76,34 @@ Tear down the cluster:
- [Working with Chaincode](docs/CHAINCODE.md)
- [Working with Applications](docs/APPLICATIONS.md)
### DNS Resolution on OSX
Fabric's OSX binaries have been statically linked with the golang `go` DNS resolver. In some environments, this
causes a brief but [noticeable delay](https://github.com/hyperledger/fabric/issues/3372) when issuing peer commands
against the test network.
Workarounds to improve DNS resolution time on OSX:
- Reduce the system resolver timeout from the default 5s by adding to /etc/resolv.conf:
```shell
options: timeout 2
```
- Add manual DNS overrides for virtual hosts by adding to /etc/hosts:
```
127.0.0.1 org0-ca.vcap.me
127.0.0.1 org1-ca.vcap.me
127.0.0.1 org2-ca.vcap.me
127.0.0.1 org0-orderer1.vcap.me
127.0.0.1 org0-orderer2.vcap.me
127.0.0.1 org0-orderer3.vcap.me
127.0.0.1 org1-peer1.vcap.me
127.0.0.1 org1-peer2.vcap.me
127.0.0.1 org2-peer1.vcap.me
127.0.0.1 org2-peer2.vcap.me
```
- Compile the [fabric binaries](https://github.com/hyperledger/fabric) on a Mac and copy `build/bin/*` outputs to
`test-network-k8s/bin`. Mac native builds are linked against the `netdns=cgo` DNS resolver, and are not
subject to the timeouts associated with the Golang DNS resolver.