解决问题:WARNING oslo_db.sqlalchemy.session [-] SQL connection failed. 10 attempts le

root@node-controller:/etc/keystone# su -s /bin/sh -c "keystone-manage db_sync" keystone

2016-07-19 02:37:23.521 74327 WARNING oslo_db.sqlalchemy.session [-] SQL connection failed. 10 attempts left.

解决方法:

    出现此问题,一般是和数据库连接不上,检查和数据库的连接,或者重启数据库服务

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