Cannot Connect to Local Redis Instance: Invalid Host Name "localhost"

Question

Eric Cole 2022-1-30

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https://ww2.mathworks.cn/matlabcentral/answers/1638905-cannot-connect-to-local-redis-instance-invalid-host-name-localhost

编辑： Nicole Bonfatti 2023-6-1

Hi everyone,

I'm trying to get started with connecting MATLAB to a local Redis data cache instance. I've followed the basic example in the mps documentation but I've been getting the following error:

https://www.mathworks.com/help/mps/ml_code/use-a-data-cache-to-persist-data.html

I'm on Mac OS Catalina 10.15.7. I've installed Redis via homebrew and was able to connect successfully from the command line (successful ping-pong output), including creating the sever with "-h localhost" and port #6379.

I don't really understand what's going on. Am I supposed to start the server from the command line first and then MATLAB connects to it, or does mps.cache.control create it? Does being on Mac require more setup first? Am I supposed to create the data cache with a specific configuration using the mps command line tools first (which I couldn't try because I couldn't find the path for the CLI code)?

Sorry if these are newbie questions, but I haven't really found anything that appears to be related yet in the documentation or online. Any other resources would be appreciated!

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Answer 1

Seth DeLand 2023-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/1638905-cannot-connect-to-local-redis-instance-invalid-host-name-localhost#answer_1155260

I encountered this same message, for me the problem was that my /etc/hosts file on MacOS had been modified when I did some work with docker/kubernetes. By default, that file has the following 3 lines:

127.0.0.1 localhost

255.255.255.255 broadcasthost

::1 localhost

Mine had this additional line that was uncommented:

127.0.0.1 kubernetes.docker.internal

When I commented out that line above (with a "#" sign) and saved the file, I was able to start the Redis cache from MATLAB.

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Nicole Bonfatti 2023-6-1

编辑：Nicole Bonfatti 2023-6-1

if you still want that "kubernetes.docker.internal" hostname to resolve, after commenting it out you can add it to the end of the first "localhost" line. IE:

127.0.0.1 localhost kubernetes.docker.internal

See: The wikipedia entry for the hosts file.

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