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Deployment:

all environments:
- stash/revert all not commited changes,
- add and push new tag,
- clear local caches,
- generate assets using assetic:dump --env=prod command,
- remove cache form app/cache dir,
- temporarily change local parameters.yml to proper one,
- pack app, public_html, src, vendor dirs, .htaccess and php.ini files from main dir, upload it and replace with existing ones, remember to copy data to public_html dir instead of replacing it,
- make proper database migration (if manual, remember to add new migration versions to migration_versions table),
stage:
- copy everything from public_html to private_html,
- uncomment first line in .htaccess in public_html and private_html,
- optionally remove .htaccess and php.ini files from main dir.