Hi Charles, On Thu, Mar 24, 2011 at 05:14:09PM +0000, Charles Duffy wrote: > Howdy! > > I'm using HAProxy in TCP mode to redirect traffic to my database servers, > with a HTTP check to filter for servers appropriate to each pool -- a > master pool (of only one server, the identity of which may change on > failover events), a pool for slaves not more than 30 seconds out of date, > a pool for servers not more than 10 minutes out of date, etc. > > The problem I have here is that on startup or restart, all servers are > briefly considered eligible candidates for the master pool until the > layer 7 checks come back. This is not acceptable for my use case -- I > need to be able to flag all servers expected to be slaves as down-by- > default in this backend (or have all checks assumed to be "down" until > determined otherwise, such that traffic goes to the backup pool). > > Does HAProxy currently have an appropriate mechanism for this?
Ideally we should be able to decide whether the servers start up or down until the check returns a verdict. Right now you can at least specify "disabled" on each server line. The server will not even be checked, so you'll be able to do what you want with it. Once you've finished, you connect to the stats socket and enter "enable server XXX" and the checks will start again. Alternatively, you can enable them from the stats interface. Obviously this requires a stats socket or interface in admin mode. Hoping this helps, Willy
