I tried to install the google pubsub input and elasticsearch output plugins after I install the logstash, however, it raised out the following error:
Error Bundler::InstallError, retrying 1/10
An error occurred while installing signet (0.8.0), and Bundler cannot continue.
Make sure that `gem install signet -v '0.8.0'` succeeds before bundling.
WARNING: can not set Session#timeout=(0) no session context
Error Bundler::InstallError, retrying 2/10
An error occurred while installing signet (0.8.0), and Bundler cannot continue.
Make sure that `gem install signet -v '0.8.0'` succeeds before bundling.
WARNING: can not set Session#timeout=(300) no session context
WARNING: can not set Session#timeout=(0) no session context
Error Bundler::Fetcher::CertificateFailureError, retrying 3/10
Could not verify the SSL certificate for https://rubygems.org/quick/Marshal.4.8/logstash-devutils-1.3.4-java.gemspec.rz.
There is a chance you are experiencing a man-in-the-middle attack, but most likely your system doesn't have the CA certificates needed for verification. For information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without using SSL, edit your Gemfile sources and change 'https' to 'http'.
WARNING: can not set Session#timeout=(300) no session context
WARNING: can not set Session#timeout=(300) no session context
Error Bundler::Fetcher::CertificateFailureError, retrying 4/10
Could not verify the SSL certificate for https://rubygems.org/quick/Marshal.4.8/logstash-devutils-1.3.4-java.gemspec.rz.
There is a chance you are experiencing a man-in-the-middle attack, but most likely your system doesn't have the CA certificates needed for verification. For information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without using SSL, edit your Gemfile sources and change 'https' to 'http'.
WARNING: can not set Session#timeout=(300) no session context
WARNING: can not set Session#timeout=(300) no session context
Error Bundler::Fetcher::CertificateFailureError, retrying 5/10
Could not verify the SSL certificate for https://rubygems.org/quick/Marshal.4.8/logstash-devutils-1.3.4-java.gemspec.rz.
There is a chance you are experiencing a man-in-the-middle attack, but most likely your system doesn't have the CA certificates needed for verification. For information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without using SSL, edit your Gemfile sources and change 'https' to 'http'.
WARNING: can not set Session#timeout=(300) no session context
WARNING: can not set Session#timeout=(300) no session context
Error Bundler::Fetcher::CertificateFailureError, retrying 6/10
Could not verify the SSL certificate for https://rubygems.org/quick/Marshal.4.8/logstash-devutils-1.3.4-java.gemspec.rz.
There is a chance you are experiencing a man-in-the-middle attack, but most likely your system doesn't have the CA certificates needed for verification. For information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without using SSL, edit your Gemfile sources and change 'https' to 'http'.
WARNING: can not set Session#timeout=(300) no session context
WARNING: can not set Session#timeout=(300) no session context
Error Bundler::Fetcher::CertificateFailureError, retrying 7/10
Could not verify the SSL certificate for https://rubygems.org/quick/Marshal.4.8/logstash-devutils-1.3.4-java.gemspec.rz.
There is a chance you are experiencing a man-in-the-middle attack, but most likely your system doesn't have the CA certificates needed for verification. For information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without using SSL, edit your Gemfile sources and change 'https' to 'http'.
WARNING: can not set Session#timeout=(300) no session context
WARNING: can not set Session#timeout=(300) no session context
Error Bundler::Fetcher::CertificateFailureError, retrying 8/10
Could not verify the SSL certificate for https://rubygems.org/quick/Marshal.4.8/logstash-devutils-1.3.4-java.gemspec.rz.
There is a chance you are experiencing a man-in-the-middle attack, but most likely your system doesn't have the CA certificates needed for verification. For information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without using SSL, edit your Gemfile sources and change 'https' to 'http'.
WARNING: can not set Session#timeout=(300) no session context
WARNING: can not set Session#timeout=(300) no session context
Error Bundler::Fetcher::CertificateFailureError, retrying 9/10
Could not verify the SSL certificate for https://rubygems.org/quick/Marshal.4.8/logstash-devutils-1.3.4-java.gemspec.rz.
There is a chance you are experiencing a man-in-the-middle attack, but most likely your system doesn't have the CA certificates needed for verification. For information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without using SSL, edit your Gemfile sources and change 'https' to 'http'.
WARNING: can not set Session#timeout=(300) no session context
WARNING: can not set Session#timeout=(300) no session context
Error Bundler::Fetcher::CertificateFailureError, retrying 10/10
Could not verify the SSL certificate for https://rubygems.org/quick/Marshal.4.8/logstash-devutils-1.3.4-java.gemspec.rz.
There is a chance you are experiencing a man-in-the-middle attack, but most likely your system doesn't have the CA certificates needed for verification. For information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without using SSL, edit your Gemfile sources and change 'https' to 'http'.
WARNING: can not set Session#timeout=(300) no session context
WARNING: can not set Session#timeout=(300) no session context
Too many retries, aborting, caused by Bundler::Fetcher::CertificateFailureError
ERROR: Installation Aborted, message: Could not verify the SSL certificate for https://rubygems.org/quick/Marshal.4.8/logstash-devutils-1.3.4-java.gemspec.rz.
There is a chance you are experiencing a man-in-the-middle attack, but most likely your system doesn't have the CA certificates needed for verification. For information about OpenSSL certificates, see bit.ly/ruby-ssl. To connect without using SSL, edit your Gemfile sources and change 'https' to 'http'.
The command '/bin/sh -c $LOGSTASH_HOME/bin/logstash-plugin install logstash-input-google_pubsub' returned a non-zero code: 1
I have tried to change the 'https' to 'http' in Gemfile or did gem install signet -v '0.8.0'. But none of them cannot work. Could anyone helps? Thanks.