How to use Use git+gerrit

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http://serverfault.com – I want to configure Git + Gerrit but I don't know how to proceed; I have some questions: Can we use our own Gerrit server or can we use online gerrit servers also? How my project will be associated with Gerrit? What I understood is when we are going to commit any changes from Eclipse to Git they firstly go to Gerrit for code review, and when some one accepts the code then and then only code is committed to Git: is that correct? (HowTos)