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|Pack canny_tudor -- prolog/paxos/udp_broadcast.pl|
Sets up Paxos over UDP broadcast on port 20005. Hooks up Paxos messaging
to UDP broadcast bridging using the
Initialisation order affects success. First initialises UDP broadcasting then initialises Paxos. The result is two additional threads: the UDP inbound proxy and the Paxos replicator.
You can override the UDP host, port and broadcast scope. Load settings
first if you want to override using file-based settings. Back-up
defaults derive from the environment and finally fall on hard-wired
values of 0.0.0.0, port 20005 via
paxos scope. You can also override
the automatic Paxos node ordinal; it defaults to -1 meaning automatic
discovering of unique node number. Numbers start at 0 and increase by
one, translating to binary power indices for the quorum bit mask.
Note that environment defaults require upper-case variable names for Linux. Variable names match case-sensitively on Unix platforms.
For Docker in production mode, your nodes want to interact using the UDP
broadcast port. This port is not automatically available unless you
publish it. See example snippet below. The
ports setting lists port
20005 for UDP broadcasts across the stack.
version: "3" services: my-service: image: my/image ports: - 20005:20005/udp - 8080:8080/tcp
The following predicates are exported, but not or incorrectly documented.