Accidental Technologist

Musings about Entrepreneurship, Technology and Software Development

Redis::CommandError – MISCONF Redis is configured to save RDB snapshots

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I recently ran into a problem I hadn’t encountered before on my Mac. I was getting an error from Redis:

MISCONF Redis is configured to save RDB snapshots, but it is currently not able to persist on disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.

The fix is simple. From a terminal window, enter the Redis CLI. From a terminal window type:

redis-cli

Use the command:

config set stop-writes-on-bgsave-error no

You should get an OK response, then type exit to get out of the reds-cli.

Try again where you received the error and everything should be working as expected.

Homebrew Upgrade Woes

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I ran into an interesting problem recently after updating my installation of Homebrew on my Mac Pro. ? Starting with the update command, which ran successfully:

$ brew update

I then attempted to update my redis installation to the latest:

$ brew upgrade redis

I was greeted with this message:

Error: undefined local variable or method `brew_install' for main:Object

Trying several things on my own to no avail, led me to a Google search result pointing out a known issue and solution. ?It appears there is an issue with a brew_upgrade.rb artifact being left behind after a brew update. ?The following commands from the Homebrew wiki fix the problem:

$ cd $(brew --prefix)/Library/Contributions/examples
$ git clean -n # if this doesn't list anything that you want to keep, then
$ git clean -f # this will remove untracked files

I hope this helps someone with the same problem.