Fluentd pod stuck in CrashLoopBackOff

Issue

• Why is the fluentd pod stuck in CrashLoopBackOff and unable to start?

• Why is the fluentd-init container logging the following error message certificate verify failed (unable to get local issuer certificate)

  $ oc logs fluentd-j3bcl -c fluentd-init 
  /opt/rh/rh-ruby25/root/usr/share/ruby/net/protocol.rb:44:in `connect_nonblock': SSL_connect returned=1 errno=0 state=error: certificate verify failed (unable to get local issuer 
  certificate) (OpenSSL::SSL::SSLError)
      from /opt/rh/rh-ruby25/root/usr/share/ruby/net/protocol.rb:44:in `ssl_socket_connect'
      from /opt/rh/rh-ruby25/root/usr/share/ruby/net/http.rb:985:in `connect'
      from /opt/rh/rh-ruby25/root/usr/share/ruby/net/http.rb:920:in `do_start'
      from /opt/rh/rh-ruby25/root/usr/share/ruby/net/http.rb:909:in `start'
      from /opt/rh/rh-ruby25/root/usr/share/ruby/net/http.rb:609:in `start'
      from wait_for_es_version.rb:26:in `<main>'