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Hi everybody!
I was testing some things with LVS, and some questions raised. Let me
explain:
Imagine we have two mysql-servers(or whatever), and we want a setup
Master-Spare.
Then we have the following config:
===================
checktimeout=15
checkinterval=1
autoreload=no
quiescent = no
maintenancedir = /var/run/ldirectord-downed-hosts/
#mysql
virtual=xx.xx.xx.xx:3306
real=xx.xx.xx.XY:3306 gate
fallback=xx.xx.xx.YX:3306 gate
service=mysql
login="monitoring"
passwd="password"
request="show status;"
scheduler=wlc
protocol=tcp
checktype=negotiate
===================
So, when from some site I connect to xx.xx.xx.xx:3306, and when xx.xx.xx.XY
becomes unavailable for some reason, real-server is deleted and
fallback-server goes up.
I can force that with a:
touch /var/run/ldirectord-downed-hosts/xx.xx.xx.XY, then xx.xx.xx.YX comes
up.
But now there is something I don't understand quite well.
Imagine I'm doing some maintenance in the fallback node: xx.xx.xx.YX
I though that maybe just doing:
touch /var/run/ldirectord-downed-hosts/xx.xx.xx.YX
lvs would detect that the fallback-server is not accesible, so it only has
the real-server.
But then, if the real-servers goes down for some reason(just imagine a
voluntary 'server mysql stop'), lvs will delete the real-server and put
fallback-server in its side.
But that is a problem from my point of view, because I do not want do mess
with fallback-server while I'm doing some maintenance.
Actually the same aproach is like:
When xx.xx.xx.XY is alive:
TCP xx.xx.xx.xx:3306 wlc
-> xx.xx.xx.XY:3306 Route 1 0 4
Then if we stop mysql from xx.xx.xx.XY, xx.xx.xx.YX becomes available :
TCP xx.xx.xx.xx:3306 wlc
-> xx.xx.xx.YX:3306 Route 1 0 4
But if I stop mysql from xx.xx.xx.YX, nothign is happening, lvs does not
delete xx.xx.xx.YX from the server lists.
Maybe I'm doind something wrong?
thank you very much
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