E, [2016-06-14T22:42:19.384405 #7872] ERROR -- : GSSAPI continuation error: Unspecified GSS failure.  Minor code may provide more information
GSSAPI continuation error: No Kerberos credentials available
n/usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.1.4/lib/active_record /connection_adapters/postgresql_adapter.rb:888:in     `initialize'n/usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/postgresql_adapter.rb:888:in `new'n/usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.1

connection_params = {
    host: 'myserver.ru',
    username: 'myuser',
    krbsrvname: 'postgres',
}
connection_config = ActiveRecord::Base.connection_config.except(:username, :password, :host).merge(connection_params)
ActiveRecord::Base.establish_connection(connection_config)

development:
  adapter: postgresql
  encoding: unicode
  database: development
  host: localhost
  pool: 5
  username: postgres
  password: postgres

# TYPE  DATABASE        USER            ADDRESS                 METHOD
host    all             all             192.168.0.0/16          gss    include_realm=0 krb_realm=MYSERVER.RU
host    all             postgres        127.0.0.1/32            md5