diff --git a/util/MsSql/entrypoint.sh b/util/MsSql/entrypoint.sh
index b136afe83b..e2e1c5cc2c 100644
--- a/util/MsSql/entrypoint.sh
+++ b/util/MsSql/entrypoint.sh
@@ -27,6 +27,17 @@ useradd -o -u $LUID -g $GROUPNAME -s /bin/false $USERNAME >/dev/null 2>&1 ||
 usermod -o -u $LUID -g $GROUPNAME -s /bin/false $USERNAME >/dev/null 2>&1
 mkhomedir_helper $USERNAME
 
+# Read the SA_PASSWORD value from a file for swarm environments.
+# See https://github.com/Microsoft/mssql-docker/issues/326
+if [ ! -z "$SA_PASSWORD" ] && [ ! -z "$SA_PASSWORD_FILE" ]; then
+    echo "Provided both SA_PASSWORD and SA_PASSWORD_FILE environment variables. Please only use one."
+    exit 1
+fi
+if [ ! -z "$SA_PASSWORD_FILE" ]; then
+    # It should be exported, so it is available to the env command below.
+    export SA_PASSWORD=$(cat $SA_PASSWORD_FILE)
+fi
+
 # The rest...
 
 # ref: https://stackoverflow.com/a/38850273