Siim Põder wrote: > Hi > > Gerry Reno wrote: > >> How can I use keepalived in a highly dynamic cloud environment? How can >> I keep keepalived.conf up-to-date with the currently activated instances? >> > > However, the answer to your question depends on what you mean by > "highly dynamic cloud environment". If you mean that changes in real > servers and services will occur from time to time then keepalived > absolutely supports this. > > If you mean that you will be updating the configuration every 3 > seconds, then YMMV. It might work, but you may discover new bugs as > most people probably don't use keepalived that way. > > Also, you have to keep updating/generating the configuration file and > reloading (no downtime luckily) - there is not CLI or any other > similar machanism to dynamically update small parts of keepalived conf > in memory. You would most likely have to do some imaginative scripting. > > Siim >
The problem is the number of contracting/expanding real servers. My suggestion is if there was a mechanism whereby keepalived.conf could just import from a database to know the current real servers, something like: /etc/keepalived/servers.d/206.47.60.33:80-192.168.1.2:80.conf /etc/keepalived/servers.d/206.47.60.33:80-192.168.1.3:80.conf /etc/keepalived/servers.d/206.47.60.33:80-192.168.1.4:80.conf ... And then in keepalived.conf for virtual server 206.47.60.33 port 80 just have something like "import servers.d/206.47.60.33:80-*.conf" or similar. Now the servers.d/ files could be generated/removed according to current active instances and then if the keepalived daemon/server needed restarting it would always have the current state for the real servers. -Gerry _______________________________________________ Please read the documentation before posting - it's available at: http://www.linuxvirtualserver.org/ LinuxVirtualServer.org mailing list - lvs-users@LinuxVirtualServer.org Send requests to lvs-users-requ...@linuxvirtualserver.org or go to http://lists.graemef.net/mailman/listinfo/lvs-users
