{"id":2066,"date":"2011-08-01T18:00:48","date_gmt":"2011-08-01T18:00:48","guid":{"rendered":"http:\/\/www.gosquared.com\/liquidicity\/?p=2066"},"modified":"2019-11-28T12:49:46","modified_gmt":"2019-11-28T12:49:46","slug":"resolve-elb-connectivity-issues","status":"publish","type":"post","link":"https:\/\/www.gosquared.com\/blog\/resolve-elb-connectivity-issues","title":{"rendered":"Resolve ELB connectivity issues"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/static.gosquared.com\/images\/liquidicity\/09_12_06_geoffdev_790x100.jpg\" alt=\"Dev with Geoff - Development time with our CTO Geoff Wagstaff\" width=\"790\" height=\"100\"\/><\/p>\n<p>We&#8217;ve recently been running into a recurring issue with AWS&#8217; Elastic Load Balancing service. The problem manifests itself in vastly increased latency or eventual dropout of requests against the load balancer.<\/p>\n<p>We verified the health of our instances in each availability zone, and concluded that it was not a problem at the instance level. Second, we confirmed that our DNS queries were being routed to the ELB correctly. They were. So the issue was at the ELB level.<\/p>\n<p>As it turns out, there appears to have been\/still is a bug where ELB will suddenly decide that there are no available instances in a particular availability zone, or at least it will have trouble connecting to instances in that particular zone. Even if the instances are perfectly fine, and pass all health checks.<\/p>\n<p>The solution was to try to identify the suspect zone, and de-register that zone and all of its instances from the ELB. Once re-registering the zone &#038; instances completed, the ELB was back up to full functionality again.<\/p>\n<p>Hope this helps next time you run into any ELB issues!<\/p>\n<p>P.S. We&#8217;re big fans of Amazon Web Services &#8211; if you haven&#8217;t already, check out our recent <a href=\"http:\/\/aws.typepad.com\/aws\/2011\/07\/summer-startups-gosquared.html\" title=\"GoSquared and Amazon Web Services - real-time web analytics in the cloud\" target=\"_blank\" rel=\"noopener noreferrer\">feature on the AWS Blog<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We&#8217;ve recently been running into a recurring issue with AWS&#8217; Elastic Load Balancing service. The problem manifests itself in vastly&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1452],"tags":[119],"class_list":["post-2066","post","type-post","status-publish","format-standard","hentry","category-engineering","tag-aws"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v18.6 (Yoast SEO v19.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Resolve ELB connectivity issues - GoSquared Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.gosquared.com\/blog\/resolve-elb-connectivity-issues\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Resolve ELB connectivity issues\" \/>\n<meta property=\"og:description\" content=\"We&#8217;ve recently been running into a recurring issue with AWS&#8217; Elastic Load Balancing service. 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