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How can I ping a password protected Redis server using netcat in an initContainer?

Note: solution can use netcat or any other built-in Linux utility

I need to implement an initContainer and liveness probe that confirms my redis pod is up for one of my redis dependent pods. I have attempted the netcat solution offered as the answer here ((printf "PINGrn"; sleep 1) | nc 10.233.38.133 6379) but I get -NOAUTH Authentication required. error in response. Any way around this? I am aware I could install redis-cli or make a management command in my Django code but would prefer not to. Nor do I want to implement a web server for my Redis instance and use curl command.

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  1. 0

    You could always send in your AUTH command as part of your probe, like:

    `"AUTH ....rnPINGrn"`

    Unless you’re getting INFO from the server, you don’t seem to care about the nature of the response, so no auth is required, just test for NOAUTH.

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  2. 0

    Here’s the initContainers stanza that you can use:

      initContainers:
    - name: wait-for-redis
      image: busybox
      command:
      - /bin/sh
      - -c
      - >
        set -x;
        until ((printf "AUTH <password>rn"; sleep 1) | nc <redis-host> 6379);
        do echo waiting for redis;
        sleep 2; done

    Just don’t forget to change <redis-host> and <password> to their values.

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