Good morning and hello, Jan! Am 11.04.2013 10:43, schrieb Jan Friesse: > Ulf Wendel napsal(a): >> Am 10.04.2013 15:02, schrieb Jan Friesse: >>> Ulf Wendel napsal(a): >>>> - Can executive daemon be added and removed online? >>>> >>> >>> Sure >>> >>>> I assume the number of application clients is limited by practical >>>> matters only, for example, time required to reach out to all connected >>>> application clients shoud be considered. Clients can connect and >>>> disconnect without bringing the cluster down. >>>> >>>> But, what if one wants to add executives? Will this require >>>> reconfiguration of all other executives in the cluster, will the cluster >>>> go down or experience a view change only... >>>> >>> >>> As long as you are using udp (multicast) nothing is needed. For udpu >>> (unicast), you must issue commands described in cmap_keys man page. >> >> >> Excellent! >> >> I've had only a quick look at spread.org but it seemed to me that >> spread.org required updating and deploying the config file manually. As >> I understand you, config deployment is an integral part of the corosync >> API and can be done at runtime. > > Actually it's only partly true. You still need to deploy configuration > file (config deployment is for sure one of things which may be so nice > to have and there were ideas of using DNS for that), but when using > multicast, you can set mcast bind address to network address (so let's > say network is 192.168.1.0/24 and n1 is 192.168.1.1, n2 is 192.168.1.2, > ..., you can set 192.168.1.0 as bindaddr in corosync.conf) and don't > need to configure each node in file on each node (as in spread toolkit). I see: given a private network and the ability to use UDP multicast, plain multicast may do the trick. Luckily, that works for me. Good to learn about spread toolkit offering a similar feature set. I wasn't sure after reading their manuals. Yes, manual config deployment is kind of a limitation. However, there seem to be very few free and open source solutions available. If you put a C/C++ constraint on top, the number is even further reduced. Thanks, Ulf _______________________________________________ discuss mailing list discuss@xxxxxxxxxxxx http://lists.corosync.org/mailman/listinfo/discuss
