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Note

that

it

is

much

easier

and

recommended

to

set

these

passwords

before

configuring

a

multi-node

cluster

as

changing

the

password

of

the

repl

user

on

a

running

cluster

is

more

disruptive.

(Instructions

for

how

to

change

the

password

of

the

MySql

repl

user

on

a

live

cluster

are

in

the

works,

and

will

likely

involve

selectively

taking

nodes

out

of

the

cluster

one

by

one.)