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Thanks you so much HoangDo,

But I'm still quite confused,

1 - If I've alredy changed some of source code of OpenStack but my server crash then I have to restart the server so that I have to run the file "stack.sh" again then OpenStack reinstall from scratch. Is there a way to run only "stack.sh" only one time at the first time after that if server have any problem so we dont need to run "stack.sh" anymore? Just running OpenStack on existence source code that downloaded at the first time without running "stack.sh"

2 - DevStack is a develop tools "all- in- one" on one node. But after modifying the source code, I want to deploy the changes on multiple nodes so I have to do so with other tools like Chef or SaltStack. How can I deploy the source code of OpenStack that has changed by DevStack by Chef or SaltStack? Because as I understand that, these tools (chef, saltstack) will deploy by the way download packages and dependencies from the internet and install OpenStack on multi-nodes as we configure but not from our exitance source code? May be I explain is not so clear, I hope you understand me. Please help me!

Thanks you so much

Thanks you so much HoangDo,

But I'm still quite confused,

1 - If I've alredy changed some of source code of OpenStack but my server crash then I have to restart the server so that I have to run the file "stack.sh" again then OpenStack reinstall from scratch. Is there a way to run only "stack.sh" only one time at the first time after that if server have any problem so we dont need to run "stack.sh" anymore? Just running OpenStack on existence source code that downloaded at the first time without running "stack.sh"

2 - DevStack is a develop tools tool "all- in- one" on one node. But after modifying the source code, I want to deploy the changes on multiple nodes so I have to do so with other tools like Chef or SaltStack. How can I deploy the source code of OpenStack that has changed by DevStack by Chef or SaltStack? Because as I understand that, these tools (chef, saltstack) will deploy by the way download packages and dependencies from the internet and install OpenStack on multi-nodes as we configure but not from our exitance source code? May be I explain is not so clear, I hope you understand me. Please help me!

Thanks you so much