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Solving chef Client errors

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Problem:
merb : chef-server (api) : worker (port 4000) ~ Connection refused - connect(2) - (Errno::ECONNREFUSED)
Solution: Check why solr is not running and start it
/etc/init.d/chef-solr start
Problem:
merb : chef-server (api) : worker (port 4000) ~ Net::HTTPFatalError: 503 "Service Unavailable" - (Chef::Exceptions::SolrConnectionError)
Solution: You need to check solr log for error. You can find
  • the access log in /var/log/chef/2013_03_01.jetty.log (adapt the date)
  • the solr error log in /var/log/chef/solr.log
Hopefully you find an error trace there.
Problem:
# chef-expander -n 1
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- http11_client (LoadError)
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/vendor_ruby/em-http.rb:8:in `'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/vendor_ruby/em-http-request.rb:1:in `'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/vendor_ruby/chef/expander/solrizer.rb:24:in `'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/vendor_ruby/chef/expander/vnode.rb:26:in `'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/vendor_ruby/chef/expander/vnode_supervisor.rb:28:in `'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/vendor_ruby/chef/expander/cluster_supervisor.rb:25:in `'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /usr/bin/chef-expander:27:in `
'
Solution: This is a gems dependency issue with the HTTP client gem. Read about it here: http://tickets.opscode.com/browse/CHEF-3495. You might want to check the active Ruby version you have on your system e.g. on Debian run
update-alternatives --config ruby
to find out and change it. Note that the emhttp package from Opscode might require a special version. You can check by listing the package files:
dpkg -L libem-http-request-ruby
/.
/usr
/usr/share
/usr/share/doc
/usr/share/doc/libem-http-request-ruby
/usr/share/doc/libem-http-request-ruby/changelog.Debian.gz
/usr/share/doc/libem-http-request-ruby/copyright
/usr/lib
/usr/lib/ruby
/usr/lib/ruby/vendor_ruby
/usr/lib/ruby/vendor_ruby/em-http.rb
/usr/lib/ruby/vendor_ruby/em-http-request.rb
/usr/lib/ruby/vendor_ruby/em-http
/usr/lib/ruby/vendor_ruby/em-http/http_options.rb
/usr/lib/ruby/vendor_ruby/em-http/http_header.rb
/usr/lib/ruby/vendor_ruby/em-http/client.rb
/usr/lib/ruby/vendor_ruby/em-http/http_encoding.rb
/usr/lib/ruby/vendor_ruby/em-http/multi.rb
/usr/lib/ruby/vendor_ruby/em-http/core_ext
/usr/lib/ruby/vendor_ruby/em-http/core_ext/bytesize.rb
/usr/lib/ruby/vendor_ruby/em-http/mock.rb
/usr/lib/ruby/vendor_ruby/em-http/decoders.rb
/usr/lib/ruby/vendor_ruby/em-http/version.rb
/usr/lib/ruby/vendor_ruby/em-http/request.rb
/usr/lib/ruby/vendor_ruby/1.8
/usr/lib/ruby/vendor_ruby/1.8/x86_64-linux
/usr/lib/ruby/vendor_ruby/1.8/x86_64-linux/em_buffer.so
/usr/lib/ruby/vendor_ruby/1.8/x86_64-linux/http11_client.so
The listing above for example indicates ruby1.8.