Mostly this is done in a cloud environment where they have Kubernetes integrated with cloud load balancers and you expose kubernetes services as type LoadBalancer.<\/p>\n
However I wanted to do this without cloud in my Virtualbox environment. Its not ideal and I wish nginx could add a port when using proxy_pass pointing to upstream. <\/p>\n
My configuration is not ideal and does not scale well. I am using it in a POC and it is working so far so documenting for future reference.<\/p>\n
NOTE I did not test if upstream is failing over but that is well documented for nginx so I trust it is working. You could of course change upstream mechanisms to round-robin, least-connected or ip-hash.<\/p>\n
user www-data;\nworker_processes 4;\nworker_rlimit_nofile 40000;\n\nevents {\n worker_connections 8192;\n}\n\nhttp {\n map $host $serverport {\n \"hello.cluster01.local\" \"30000\";\n \"web01.cluster01.local\" \"30001\";\n \"web02.cluster01.local\" \"30002\";\n default \"no_match\";\n }\n\n upstream hello.cluster01.local-30000 {\n server 172.20.100.10:30000; \n server 172.20.100.11:30000; \n }\n\n upstream web01.cluster01.local-30001 {\n server 172.20.100.10:30001;\n server 172.20.100.11:30001;\n }\n\n upstream web02.cluster01.local-30002 {\n server 172.20.100.10:30002;\n server 172.20.100.11:30002;\n }\n\n server {\n listen 80;\n server_name \"~(.*).cluster01.local\";\n set $upstream $host-$serverport; \n location \/ {\n proxy_set_header X-Forwarded-For $remote_addr;\n # if not load balancing pointing to one node like below is fine\n #proxy_pass http:\/\/172.20.100.10:$np;\n # with upstream you can't add a port so I have an upstream per service\n #proxy_pass http:\/\/backend:$np;\n proxy_pass http:\/\/$upstream;\n proxy_set_header Host $host;\n }\n }\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"Mostly this is done in a cloud environment where they have Kubernetes integrated with cloud load balancers and you expose<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[119,129],"tags":[],"class_list":["post-1846","post","type-post","status-publish","format-standard","hentry","category-kubernetes","category-nginx"],"_links":{"self":[{"href":"https:\/\/blog.ls-al.com\/wp-json\/wp\/v2\/posts\/1846","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.ls-al.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.ls-al.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.ls-al.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.ls-al.com\/wp-json\/wp\/v2\/comments?post=1846"}],"version-history":[{"count":0,"href":"https:\/\/blog.ls-al.com\/wp-json\/wp\/v2\/posts\/1846\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.ls-al.com\/wp-json\/wp\/v2\/media?parent=1846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.ls-al.com\/wp-json\/wp\/v2\/categories?post=1846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.ls-al.com\/wp-json\/wp\/v2\/tags?post=1846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}