LVS does its own connection tracking. An alternative to flash memory is a cdrom "Matthew S. Does ctsync not work? Maybe it happens and people dont think it worth mentioning. An agent running on the director monitors the services on the realservers. After that successful healthcheck, the real-server is inserted by keepalived and clients should have up-to-date data.
The most common problem found is loss of network access or extreme slowdown or DoS. Next is mechanical things like disks and fans, or connectors not making good contact. Other code used for failover is vrrpd in keepalived. Disks are really cheap compared to the cost of the labor of replacing them, or the cost of downtime.
We process about a million inbound connections a day. Note Unfortunately as with any failover setup, failover is not guaranteed in the case of a sick machine. The sockets are bound to the specified interface.
CARP has been ported to Linux http: Mon was the first tool used with LVS to handle failover. Each machine runs keepalived and MySQL. I asked Julian about http: So I just decided to bite the bullet and switch from serial heartbeats to udp.
It is working great. If you store persistent data on the virtual server, you must write your application to survive failover of the realserver and long timeouts. If one machine is in an error state e.Port Manteaux churns out silly new words when you feed it an idea or two.
Enter a word (or two) above and you'll get back a bunch of portmanteaux created by jamming together words that are conceptually related to your inputs. For example, enter "giraffe" and you'll get back words like "gazellephant" and "gorilldebeest".
This is handled by having a redundant director available. Director failover is handled in the Ultra Monkey Project by ultimedescente.com code used for failover is vrrpd in keepalived.
The director maintains session information client IP, realserver IP, realserver port), and on failover this information must be available on the new director.Download