From a4c9ab2462dd66819b2be1eebb6be5fe1a1a5312 Mon Sep 17 00:00:00 2001
From: Ventz Petkov <ventz@vpetkov.net>
Date: Fri, 6 Mar 2020 23:23:35 -0500
Subject: [PATCH] Added new BIND_LOG environment variable. By default you still
 have -g, however you can now override directly with -f for foreground
 logging. The README also has a detailed section on logging practices. I've
 also updated the binary version to the latest Alpine image v3.11.3

---
 README.md               | 16 +++++++++++++++-
 container/Dockerfile    |  5 +++++
 container/entrypoint.sh |  5 +++--
 3 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 5193a2b..6be1328 100644
--- a/README.md
+++ b/README.md
@@ -154,6 +154,20 @@ logging {
     category default  { stdout; };
 };
 
+For more information, see: https://www.slideshare.net/MenandMice/bind-9-logging-best-practices
+
+## How do I just change Bind STDERR to STDOUT logging?
+
+There is now a "BIND_LOG" ENV (environment) variable for logging
+
+Environment variables can both have a default and be customized at run time. 
+
+```
+"-g" = (default) Run the server in the foreground and force all logging stderr.
+"-f" = Run the server in the foreground
 ```
 
-For more information, see: https://www.slideshare.net/MenandMice/bind-9-logging-best-practices
+By default, the "-g" value is set, as that logs all to STDERR.
+You can now override it with "-f" by passing `-e "BIND_LOG=-f"` to `docker run`
+
+
diff --git a/container/Dockerfile b/container/Dockerfile
index 4760b2b..4a0ef75 100644
--- a/container/Dockerfile
+++ b/container/Dockerfile
@@ -3,6 +3,11 @@ EXPOSE 53 53/udp
 
 RUN apk --update upgrade && apk add bind bind-tools bind-plugins
 
+# BIND Log Options - you can override at run time
+# "-g" = (default) Run the server in the foreground and force all logging stderr.
+# "-f" = Run the server in the foreground
+env BIND_LOG -g
+
 # /etc/bind needs to be owned by root, group owned by "bind", and chmod 750
 # since we are mounting, do it manually
 # NOTE: Per Dockerfile manual --> need to mkdir the mounted dir to chown
diff --git a/container/entrypoint.sh b/container/entrypoint.sh
index 72fbd79..922db1d 100755
--- a/container/entrypoint.sh
+++ b/container/entrypoint.sh
@@ -4,5 +4,6 @@ chown -R root:named /etc/bind /var/run/named
 chown -R named:named /var/cache/bind
 chmod -R 770 /var/cache/bind /var/run/named
 chmod -R 750 /etc/bind
-# Run in foreground and log to STDERR (console):
-exec /usr/sbin/named -c /etc/bind/named.conf -g -u named $OPTIONS
+# By default - run in foreground and log to STDERR (console)
+# can be changed by running container with: -e "BIND_LOG=-f"
+exec /usr/sbin/named -c /etc/bind/named.conf $BIND_LOG -u named $OPTIONS