These upgrade steps should be helpful.
I recommend you to convert your instance from source to omnibus life will be easy after that
Please post any questions if you have.
System information
System: RedHatEnterpriseServer 6.7
Current User: git
Using RVM: no
Ruby Version: 2.1.6p336
Gem Version: 2.2.1
Bundler Version:1.5.3
Rake Version: 10.4.2
Sidekiq Version:3.3.0
GitLab information
Version: 7.10.1
Revision: d5c71c8
Directory: /opt/gitlab/embedded/service/gitlab-rails
DB Adapter: postgresql
URL: http://x.x.x.x
HTTP Clone URL: http://x.x.x.x/some-project.git
SSH Clone URL: git@x.x.x.x:some-project.git
Using LDAP: no
Using Omniauth: no