** Description changed: - haproxy is releasing a feature that provides for seamless reloads for - 1.8. + Reloading haproxy causes TCP resets for active connections. This can be + a serious issue for clouds that rely on haproxy for load balancing, and + as a result are restarting it frequently. Full related blog post is here. https://www.haproxy.com/blog/truly-seamless-reloads-with-haproxy-no-more-hacks/ - I have attempted a backport of the feature, and attached it. The patch - needs to be cleaned up, needs dep-3 tags, and needs to be tested. At - this point I'm mostly just sure that it builds. + FFE Justification + - Description- The patchset fixes the issue by adding the -x option to haproxy. This option is used for passing the unix stats socket from the old haproxy to the new one. The old haproxy then passes connections to the new haproxy using this socket *(simplified explanation). The changes are largely isolated to new functions that implement this functionality. + + - Rationale - The change is largely isolated to the new option, but for + those running clouds this could be potentially very important. Clouds + that are "doing it right", and treating instances as cattle are + constantly tearing down and rebuilding instances. This has the side + effect of constantly reloading haproxy. For example at Indeed on a few + of our clouds haproxy gets restarted roughly every second. My tests + show that this causes a connection reset rate of about 18 resets for 50k + connections. The haproxy teams are showing 11 tcp resets for 2k + connections. Either way it's greater than 0 and it's dependent on how + many connections you receive and how fast you are restarting haproxy. + I've chosen not to enable this by default in the systemd unit files, as + enabling that the stats socket in the haproxy config match the one + passed with the -x command. However for those that are seeing this + problem only having to make the config and unit file changes should be a + better user experience than hand building packages.
-- You received this bug notification because you are a member of Ubuntu High Availability Team, which is subscribed to haproxy in Ubuntu. https://bugs.launchpad.net/bugs/1712925 Title: FFE: HAproxy dropping connections (RST) during config reload / support seamless reload Status in haproxy package in Ubuntu: New Bug description: Reloading haproxy causes TCP resets for active connections. This can be a serious issue for clouds that rely on haproxy for load balancing, and as a result are restarting it frequently. Full related blog post is here. https://www.haproxy.com/blog/truly-seamless-reloads-with-haproxy-no-more-hacks/ FFE Justification - Description- The patchset fixes the issue by adding the -x option to haproxy. This option is used for passing the unix stats socket from the old haproxy to the new one. The old haproxy then passes connections to the new haproxy using this socket *(simplified explanation). The changes are largely isolated to new functions that implement this functionality. - Rationale - The change is largely isolated to the new option, but for those running clouds this could be potentially very important. Clouds that are "doing it right", and treating instances as cattle are constantly tearing down and rebuilding instances. This has the side effect of constantly reloading haproxy. For example at Indeed on a few of our clouds haproxy gets restarted roughly every second. My tests show that this causes a connection reset rate of about 18 resets for 50k connections. The haproxy teams are showing 11 tcp resets for 2k connections. Either way it's greater than 0 and it's dependent on how many connections you receive and how fast you are restarting haproxy. I've chosen not to enable this by default in the systemd unit files, as enabling that the stats socket in the haproxy config match the one passed with the -x command. However for those that are seeing this problem only having to make the config and unit file changes should be a better user experience than hand building packages. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/haproxy/+bug/1712925/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-ha Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-ha More help : https://help.launchpad.net/ListHelp
