If you take a public domain and your upstream goes down it will reboot the instance (a reboot won’t fix this)<\/li>\n<\/ul>\n\n\n\nThis is only in my case, if you resolve locally (unbound, etc…), you might want to use a public domain like:<\/p>\n\n\n\n
- platform: dnsip\n scan_interval: 60\n hostname: dns-resolving-is-alive.com\n name: dns_resolving_is_alive\n resolver: 192.168.1.4 <\/pre>\n\n\n\nElse, set up a custom domain, as such: <\/p>\n\n\n\nSetting up a custom reply on a domain (don’t pick something you actually browse to)<\/figcaption><\/figure>\n\n\n\nThe sensor values<\/h2>\n\n\n\n We don’t care what the dnsip is having as value, since for example with the one.one.one.one it will loadbalance over its two A records, what we care about is the “unknown” value which would indicate our dns is not resolving.<\/p>\n\n\n\n
Example:<\/p>\n\n\n\n
dig one.one.one.one\n\n;; ANSWER SECTION:\none.one.one.one.\t149\tIN\tA\t1.1.1.1\none.one.one.one.\t149\tIN\tA\t1.0.0.1<\/pre>\n\n\n\nMeaning every time we ask the round-robin load balancing will give us a different result as seen in the sensor history.<\/p>\n\n\n
\n
the results of round-robin load balancing<\/figcaption><\/figure>\n<\/div>\n\n\nWhen (in my case) DNS stops responding it becomes an unknown:<\/p>\n\n\n
\n
DNS unresponsive.<\/figcaption><\/figure>\n<\/div>\n\n\nOr the more “safer” route and avoid rebooting the containers if internet is down or the upstream is to use the DNS rewritten result:<\/p>\n\n\n
\n
DNS is alive & kicking (no outbound connections)<\/figcaption><\/figure>\n<\/div>\n\n\nIf you stop the container (to simulate DNS not responding) it will look like this:<\/p>\n\n\n
\n
state is ‘unknown’ (UI shows capital U, but state wise its lowercase)<\/figcaption><\/figure>\n<\/div>\n\n\n
\n
Setting up the automation to reboot the DNS if resolving goes down.<\/h2>\n\n\n\n We don’t need a cooldown period on the automation, since we go from x.x.x.x to unknown.<\/p>\n\n\n\n
Since it will stay “unknown” until the resolver starts working again, thus only triggering at max 1 reboot<\/p>\n\n\n\nMake a new automation, everything default, add a trigger and action.<\/figcaption><\/figure>\n\n\n\n<\/p>\n\n\n\nYAML export<\/p>\n\n\n\n
- id: '1635167344810'\n alias: If adguard stops responding, reboot it\n description: ''\n trigger:\n - platform: state\n entity_id: sensor.dns_resolving_is_alive\n to: unknown\n condition: []\n action:\n - service: hassio.addon_restart\n data:\n addon: a0d7b954_adguard\n mode: single<\/pre>\n\n\n\nThats it! your DNS container will be rebooted when it stops responding.<\/p>\n\n\n
\n
Photo by Colin Avery<\/a> on Unsplash<\/a>\n <\/figcaption><\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"At times for an unknown reason, my AdGuard docker instance running on home assistant operating system stops responding, it ignores all queries sent to it. I have to manually restart the container, and with home […]<\/p>\n","protected":false},"author":1,"featured_media":196,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,35,4,26],"tags":[8,28,12],"class_list":["post-179","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-automation","category-dns","category-homeassistant","category-it","tag-automation","tag-dns","tag-homeassistant"],"_links":{"self":[{"href":"https:\/\/cln.io\/blog\/wp-json\/wp\/v2\/posts\/179","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cln.io\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cln.io\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cln.io\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cln.io\/blog\/wp-json\/wp\/v2\/comments?post=179"}],"version-history":[{"count":12,"href":"https:\/\/cln.io\/blog\/wp-json\/wp\/v2\/posts\/179\/revisions"}],"predecessor-version":[{"id":1205,"href":"https:\/\/cln.io\/blog\/wp-json\/wp\/v2\/posts\/179\/revisions\/1205"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cln.io\/blog\/wp-json\/wp\/v2\/media\/196"}],"wp:attachment":[{"href":"https:\/\/cln.io\/blog\/wp-json\/wp\/v2\/media?parent=179"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cln.io\/blog\/wp-json\/wp\/v2\/categories?post=179"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cln.io\/blog\/wp-json\/wp\/v2\/tags?post=179"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}