Upgrade Gitlab 7.3.2

We are running an old Gitlab Instance with 7.3.2 Omnibus Installation as I see. The Server was setup by someone who is not longer reachable. I tried to upgrade directly through omnibus from 7 to 10 but that did not work. When executing gitlab-ctl reconfigure I get the following Error

Recipe: gitlab::database_migrations
  * bash[migrate gitlab-rails database] action run
    [execute] rake aborted!
              PG::ConnectionBad: could not connect to server: No such file or directory
                Is the server running locally and accepting
                connections on Unix domain socket "/var/opt/gitlab/postgresql/.s.PGSQL.5432"?
              /opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/db.rake:49:in `block (3 levels) in <top (required)>'
              /opt/gitlab/embedded/bin/bundle:23:in `load'
              /opt/gitlab/embedded/bin/bundle:23:in `<main>'
              Tasks: TOP => gitlab:db:configure
              (See full trace by running task with --trace)

    ================================================================================
    Error executing action `run` on resource 'bash[migrate gitlab-rails database]'
    ================================================================================

    Mixlib::ShellOut::ShellCommandFailed
    ------------------------------------
    Expected process to exit with [0], but received '1'
    ---- Begin output of "bash"  "/tmp/chef-script20171203-14483-19wea60" ----
    STDOUT: rake aborted!
    PG::ConnectionBad: could not connect to server: No such file or directory
        Is the server running locally and accepting
        connections on Unix domain socket "/var/opt/gitlab/postgresql/.s.PGSQL.5432"?
    /opt/gitlab/embedded/service/gitlab-rails/lib/tasks/gitlab/db.rake:49:in `block (3 levels) in <top (required)>'
    /opt/gitlab/embedded/bin/bundle:23:in `load'
    /opt/gitlab/embedded/bin/bundle:23:in `<main>'
    Tasks: TOP => gitlab:db:configure
    (See full trace by running task with --trace)
    STDERR:
    ---- End output of "bash"  "/tmp/chef-script20171203-14483-19wea60" ----
    Ran "bash"  "/tmp/chef-script20171203-14483-19wea60" returned 1

     Resource Declaration:
    ---------------------
    # In /opt/gitlab/embedded/cookbooks/cache/cookbooks/gitlab/recipes/database_migrations.rb

     51: bash "migrate gitlab-rails database" do
     52:   code <<-EOH
     53:     set -e
     54:     log_file="#{node['gitlab']['gitlab-rails']['log_directory']}/gitlab-rails-db-migrate-$(date +%Y-%m-%d-%H-%M-%S).log"
     55:     umask 077
     56:     /opt/gitlab/bin/gitlab-rake gitlab:db:configure 2>& 1 | tee ${log_file}
     57:     STATUS=${PIPESTATUS[0]}
     58:     echo $STATUS > #{db_migrate_status_file}
     59:     exit $STATUS
     60:   EOH
     61:   environment env_variables unless env_variables.empty?
     62:   notifies :run, "execute[clear the gitlab-rails cache]", :immediately
     63:   dependent_services.each do |svc|
     64:     notifies :restart, svc, :immediately
     65:   end
     66:   not_if "(test -f #{db_migrate_status_file}) && (cat #{db_migrate_status_file} | grep -Fx 0)"
     67:   only_if { node['gitlab']['gitlab-rails']['auto_migrate'] }
     68: end

    Compiled Resource:
    ------------------
    # Declared in /opt/gitlab/embedded/cookbooks/cache/cookbooks/gitlab/recipes/database_migrations.rb:51:in `from_file'

    bash("migrate gitlab-rails database") do
      action [:run]
      retries 0
      retry_delay 2
      default_guard_interpreter :default
      command "migrate gitlab-rails database"
      backup 5
      returns 0
      code "    set -e\n    log_file=\"/var/log/gitlab/gitlab-rails/gitlab-rails-db-migrate-$(date +%Y-%m-%d-%H-%M-%S).log\"\n    umask 077\n    /opt/gitlab/bin/gitlab-rake gitlab:db:configure 2>& 1 | tee ${log_file}\n    STATUS=${PIPESTATUS[0]}\n    echo $STATUS > /var/opt/gitlab/gitlab-rails/upgrade-status/db-migrate-873248b1f0d3a7a5535771a3a1635803-da70bc4\n    exit $STATUS\n"
      interpreter "bash"
      declared_type :bash
      cookbook_name "gitlab"
      recipe_name "database_migrations"
      not_if "(test -f /var/opt/gitlab/gitlab-rails/upgrade-status/db-migrate-873248b1f0d3a7a5535771a3a1635803-da70bc4) && (cat /var/opt/gitlab/gitlab-rails/upgrade-status/db-migrate-873248b1f0d3a7a5535771a3a1635803-da70bc4 | grep -Fx 0)"
      only_if { #code block }
    end

    Platform:
    ---------
    x86_64-linux


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I read a lot in the docs, but there are so much information, that I cannot get the update working.
So what are the required steps to get the installation to a current release and what are the critical steps to take?