Ruby Net::OpenTimeout: execution expired

Question

I\'m consistently getting this error on several hosts on my machine, e.g.:

require \'open-uri\'
open(\'https://google.com\').read


Net::OpenTimeout: execution e         


        

Answer 1

I've hit another reason for this issue. Had a network where IPv6 is announced as routable but is not. That lead to IPv6 trying to be used resulting in the error.

So I had to disable IPv6.

For Red Hat Enterprise Linux 7:

# cat /etc/sysctl.d/10-ipv6.conf 
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
# sysctl -p

The require 'resolv-replace' also helped but my guess is that it just resolved to IPv4 instead so I don't want to limit app in such a way.

Answer 2

Looks like it's a an issue with how Ruby resolves DNS.

Added require 'resolv-replace' and now it's opening connections immediately.

Sources: https://stackoverflow.com/a/27485369/116925 https://github.com/ruby/ruby/pull/597#issuecomment-40507119

Answer 3

I received error from rails application in docker container, and restarting docker service solved the problem:

sudo service docker start