From 13259ceec68081d12f4c2faef5a72133c501ce39 Mon Sep 17 00:00:00 2001
From: Eugene Burkov <e.burkov@adguard.com>
Date: Tue, 18 Apr 2023 19:58:03 +0300
Subject: [PATCH] Pull request 167: 5713-healthcheck-warning
Merge in GO/adguard-home-wiki from 5713-healthcheck-warning to master
Squashed commit of the following:
commit 214d775e6a4ca215565a5a3148df2c1b16255270
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date: Tue Apr 18 19:24:48 2023 +0300
Docker: fix typos
commit 9e449b4c721bc552206b919718316d071df02fd0
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date: Tue Apr 18 19:13:06 2023 +0300
Docker: add known issues
---
Docker.md | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/Docker.md b/Docker.md
index e8ddc36..9f18cd2 100644
--- a/Docker.md
+++ b/Docker.md
@@ -224,3 +224,37 @@ your machine:
```sh
systemctl reload-or-restart systemd-resolved
```
+
+
+
+## <a href="#known-issues" id="known-issues" name="known-issues">Known issues</a>
+
+ ### Healthcheck
+
+Since **v0.107.28** the container uses Docker-provided healthcheck mechanism.
+If the implementation of the healthcheck script causes any issues with custom
+Docker images and orchestration tools (like [#5711], [#5713]), then we recommend
+disabling it by adding `--no-healthcheck` to the `docker run` command or using
+your tool's equivalent.
+
+(The actual change was made due to a necessity to handle zombie processes of
+`wget` instances, see [PID 1 Docker problem][pid1]).
+
+<!--
+TODO(e.burkov): Fix the healthcheck for zeroes, update and uncomment this
+section. Add the link to the issue.
+
+ ### Listen addresses
+
+The healthcheck script uses nslookup to check if the DNS server is up and
+healthy. If the configuration contains `0.0.0.0` or `::` in the `bind_host`
+property, the healthcheck will try to only check the `localhost.`.
+Nevertheless, it will sometimes fail ([#5714]), the workaround is to configure
+the actual IP address of the interface you want to listen on. Disabling the
+healthcheck as described above should also work.
+-->
+
+[#5711]: https://github.com/AdguardTeam/AdGuardHome/issues/5711
+[#5713]: https://github.com/AdguardTeam/AdGuardHome/issues/5713
+
+[pid1]: https://blog.phusion.nl/2015/01/20/docker-and-the-pid-1-zombie-reaping-problem