We had installed the component pack for HCL Connections 8 in a brand new kubernetes environment. All the containers started and looked fine. Once we routed the traffic through the mw-proxy, Connections stopped working.<\/p>\n
After a long investigation period we found the problem in the containers:<\/p>\n
nslookup ihs-internal.test.com worked
\nping ihs-internal.test.com returned a “Name or service not known” error
\ngetent hosts ihs-internal.test.com returned nothing<\/p>\n
Of course we did the first tests with a busybox conatiner. And of course nsloookup, ping and getent worked in the busybox….<\/p>\n
After some extensive researching, the source of the problem had been identified in the \/etc\/resolv.conf. The file contained the line:
\noptions ndots:5<\/p>\n
For one deployment, that could have been fixed with a simple dnsConfig entry: But the Componenpack has 20+ Deployments..<\/p>\n Digging deeper into that issue showed that each worker node had a \/etc\/resolv.conf like this: The next step had been to add the doamin test.com as a suffix So we removed the search line completely. As we always use the FQDN and don’t rely on the shortnames. So after all kubernetes nodes had been patched with this new resolv.conf, nslookup, ping and getent returned the expected results in all the Componentpack containers.<\/p>\n","protected":false},"excerpt":{"rendered":" We had installed the component pack for HCL Connections 8 in a brand new kubernetes environment. All the containers started<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54,23],"tags":[132,130,131,129,128,133,134],"class_list":["post-994","post","type-post","status-publish","format-standard","hentry","category-component-pack","category-connections","tag-componentpack","tag-coredns","tag-dns","tag-k8s","tag-kubernetes","tag-nslookup","tag-ping"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ume.li\/blog\/wp-json\/wp\/v2\/posts\/994","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ume.li\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ume.li\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ume.li\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ume.li\/blog\/wp-json\/wp\/v2\/comments?post=994"}],"version-history":[{"count":3,"href":"https:\/\/www.ume.li\/blog\/wp-json\/wp\/v2\/posts\/994\/revisions"}],"predecessor-version":[{"id":997,"href":"https:\/\/www.ume.li\/blog\/wp-json\/wp\/v2\/posts\/994\/revisions\/997"}],"wp:attachment":[{"href":"https:\/\/www.ume.li\/blog\/wp-json\/wp\/v2\/media?parent=994"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ume.li\/blog\/wp-json\/wp\/v2\/categories?post=994"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ume.li\/blog\/wp-json\/wp\/v2\/tags?post=994"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n
\ndnsConfig:
\n options:
\n - name: ndots
\n value: \"2\"
\n<\/code><\/p>\n
\n
\nnameserver 10.100.50.10
\nnameserver 10.100.50.11
\nsearch servers.cnx.test.com
\n<\/code><\/p>\n
\n
\nnameserver 10.100.50.10
\nnameserver 10.100.50.11
\nsearch servers.cnx.test.com test.com
\n<\/code>
\nWhich did not help at all.<\/p>\n
\n
\nnameserver 10.100.50.10
\nnameserver 10.100.50.11
\n<\/code><\/p>\n