if use this way, how to get omnibus gitlab 8.14.3?this version?
Bitnami switched the installation method from source to Omnibus starting with version 8.16.3-0. Updates are now easier but you should first switch your installation to Omnibus. The procedure would consist of the following steps:
Back up your current Gitlab data.
Install an Omnibus package for the same version of Gitlab you already have (8.14.3) on a fresh instance. Please note you should install Gitlab from http://gitlab.com53, not Bitnami.
Restore the backup you performed earlier.
Upgrade Gitlab Omnibus by following the standard upgrade procedure.
Back up the upgraded Gitlab data.
Launch a Bitnami Gitlab 9.0.5 instance and restore the previous backup.
Hope it helps.