My rails app has become unable to redeploy due to 'swapon failed'

Questions / Help
1

I tried to redeploy the Rails app that was working until yesterday, but it stopped working. The error message is as follows.

  echo 10 > /proc/sys/vm/swappiness
  swapon /swapfile
  swapon: /swapfile: swapon failed: Invalid argument
  rails aborted!
  Command failed with status (255): [swapon /swapfile...]

I added a code to fly.toml, “swap_size_mb = 512”, but the app don’t work.
where is the problem?

2

Added rails

3

Hi… You have to also locate and remove the swapon commands, since those are no longer valid.

Do you have a file named docker-entrypoint?

4

Thank you for your kind message.
I cannot fide the file, but I found a code “swapon/swapfile” in fly.rake.

  task :server => :swapfile do
    sh 'bin/rails server'
  end

  task :swapfile do
    sh 'fallocate -l 512M /swapfile'
    sh 'chmod 0600 /swapfile'
    sh 'mkswap /swapfile'
    sh 'echo 10 > /proc/sys/vm/swappiness'
    sh 'swapon /swapfile'
  end

Would it be better to fix this code?

5

Yes, this does look like the right place…

None of the commands in task :swapfile are needed, now that you have your fly.toml setting.

1 Like
6

Thank you for very good advice!
I was able to deploy after modifying the code as follows.

  task :server do
    sh 'bin/rails server'
  end
1 Like
7

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