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visits member for 2 years, 3 months
seen Sep 19 at 15:15

Sep
18
awarded  Commentator
Sep
18
comment Visudo Gives no Error but asks “What Now?”
Indeed, thankyou, it needed the full path. Though shouldn't visudo give an error message explaining the error?
Sep
18
accepted Visudo Gives no Error but asks “What Now?”
Sep
18
asked Visudo Gives no Error but asks “What Now?”
Aug
21
comment Risks of Network Partitioning When a Split Brain Creates a Security Flaw
I would not want to put trust in a single data-centre. Any downtime would be very bad for the service I'm providing.
Aug
21
awarded  Supporter
Aug
19
comment Risks of Network Partitioning When a Split Brain Creates a Security Flaw
let us continue this discussion in chat
Aug
19
comment Risks of Network Partitioning When a Split Brain Creates a Security Flaw
What if you have nodes A, B and C. AB are connected and C is left on it's own. A client may be able to access A, B and C and use the AB partition or would that never be the case?
Aug
19
comment Risks of Network Partitioning When a Split Brain Creates a Security Flaw
As long as the client can reach a node that can achieve a quorum that is.
Aug
19
comment Risks of Network Partitioning When a Split Brain Creates a Security Flaw
I can program the client to try other nodes if one node cannot achieve a quorum. So if the client makes a request to a node in a partition without the quorum, it will eventually choose a node with a quorum. So the client will be able to spend.
Aug
19
awarded  Scholar
Aug
19
accepted Risks of Network Partitioning When a Split Brain Creates a Security Flaw
Aug
19
comment Risks of Network Partitioning When a Split Brain Creates a Security Flaw
The solution does provide availability of the system in the cases where a minority of nodes are down or are not reachable between each other but not if a majority cannot be reached between each other. Still, what are the chances that the majority of nodes go down at the same time (unless a bug in the software)? This solution would also require more communication between nodes than longneck's solution but creating an extremely lightweight communication protocol should not be difficult and multiple requests/responses can be sent together when nodes are busy. Definitely worth experimenting with.
Aug
19
comment Risks of Network Partitioning When a Split Brain Creates a Security Flaw
Thank you for the answer. The quorum solution is very appealing although quite complex to ensure correct communication between nodes. From how I understand it, to process a spend request a node would need approval by the majority of other nodes. Considerations would need to be in place where no nodes can achieve a quorum and thus needs to reset. And it must be ensured that nodes do not vote for more than one node to do work. However I feel it is indeed achievable.
Aug
19
comment Risks of Network Partitioning When a Split Brain Creates a Security Flaw
I had the idea of dividing work between nodes. This is a simple solution and has some advantages. The advantages being that if a node is taken over by an attacker, the attacker wouldn't have complete access to all records; there would be some functionality for failures down to a single operating node and it is a reasonably simple solution without needing much communication between nodes since each node independently operates on their own records. However, the solution means if a node goes down, some of the records are not spendable.
Aug
19
comment Risks of Network Partitioning When a Split Brain Creates a Security Flaw
Thank you for the answer but your idea creates a single point of failure which is not what I want.
Aug
18
awarded  Student
Aug
18
asked Risks of Network Partitioning When a Split Brain Creates a Security Flaw