What's up with my gem install? symbol SSLv2_method, version OPENSSL_1.0.0 not defined

Ever met this guy?

ERROR:  Loading command: install (LoadError)
  /usr/lib/x86_64-linux-gnu/ruby/2.1.0/openssl.so: symbol SSLv2_method, version OPENSSL_1.0.0 not defined in file libssl.so.1.0.0 with link time reference - /usr/lib/x86_64-linux-gnu/ruby/2.1.0/openssl.so
ERROR:  While executing gem ... (NoMethodError)
    undefined method `invoke_with_build_args' for nil:NilClass

I have encountered it in a bunch of docker containers that are running ubuntu and doing a gem install. Looks like we’re trying to install a ruby / rubygems version that’s not compatible with the pre-configured OpenSSL shipped on our Ubuntu machine — so the easy fix is:

apt-get update
apt-get install openssl

which will upgrade OpenSSL.

An alternative method (thanks to Mohamed):

apt-get install -y libssl-dev

which I assume takes care of updating OpenSSL as well.


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