From 171ae20200b2aebabd3e267748e87371fa6eb8cf Mon Sep 17 00:00:00 2001
From: Annie Oelschlager <41480572+aOelschlager@users.noreply.github.com>
Date: Fri, 1 Dec 2023 16:45:10 -0600
Subject: [PATCH] Issue 309 - Adding transaction isolation and default to read
 committed (#311)

---
 mariadb/Dockerfile                                         | 7 +++++--
 mariadb/README.md                                          | 3 ++-
 mariadb/rootfs/etc/confd/templates/mariadb-server.cnf.tmpl | 1 +
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/mariadb/Dockerfile b/mariadb/Dockerfile
index 6b534651..7d2845d5 100644
--- a/mariadb/Dockerfile
+++ b/mariadb/Dockerfile
@@ -23,7 +23,10 @@ RUN --mount=type=cache,id=mariadb-apk-${TARGETARCH},sharing=locked,target=/var/c
 # base image. Set to 10 minutes just incase it ran on very old or overallocated
 # hardware.
 ENV S6_CMD_WAIT_FOR_SERVICES_MAXTIME=600000
-# Default Mariadb value of 16 MB (bytes)
-ENV MYSQL_MAX_ALLOWED_PACKET=16777216
+
+ENV \ 
+    # Default Mariadb value of 16 MB (bytes)
+    MYSQL_MAX_ALLOWED_PACKET=16777216 \
+    MYSQL_TRANSACTION_ISOLATION=READ-COMMITTED
 
 COPY --link rootfs /
diff --git a/mariadb/README.md b/mariadb/README.md
index a659a605..1eb3e4a5 100644
--- a/mariadb/README.md
+++ b/mariadb/README.md
@@ -41,7 +41,8 @@ default database connection configuration.
 | :------------------- | :------ | :------------------------------------------------------------------------------------ |
 | MYSQL_ROOT_PASSWORD  |         | The database root user password. Defaults to `DB_ROOT_PASSWORD`                       |
 | MYSQL_ROOT_USER      |         | The database root user (used to create the site database). Defaults to `DB_ROOT_USER` |
-| MYSQL_MAX_ALLOWED_PACKET | 16777216 | Max packet length to send to or receive from the server, [documentation](https://mariadb.com/docs/server/ref/mdb/system-variables/max_allowed_packet/) |
+| MYSQL_MAX_ALLOWED_PACKET | 16777216 | Max packet length to send to or receive from the server, [documentation](https://mariadb.com/docs/server/ref/mdb/system-variables/max_allowed_packet/) 
+| MYSQL_TRANSACTION_ISOLATION | READ-COMMITTED | The isolation level for transactions.
 
 ## Logs
 
diff --git a/mariadb/rootfs/etc/confd/templates/mariadb-server.cnf.tmpl b/mariadb/rootfs/etc/confd/templates/mariadb-server.cnf.tmpl
index 75b10f93..a5845def 100644
--- a/mariadb/rootfs/etc/confd/templates/mariadb-server.cnf.tmpl
+++ b/mariadb/rootfs/etc/confd/templates/mariadb-server.cnf.tmpl
@@ -9,6 +9,7 @@
 [mysqld]
 # skip-networking
 max_allowed_packet ={{ getenv "MYSQL_MAX_ALLOWED_PACKET" }}
+transaction-isolation ={{ getenv "MYSQL_TRANSACTION_ISOLATION" }}
 # Galera-related settings
 [galera]
 # Mandatory settings