From b9fe2703cbede4dff8c448c5efffbbf51af554ba Mon Sep 17 00:00:00 2001
From: Daniel Neto <daniel.jsilvan@gmail.com>
Date: Mon, 23 Sep 2019 16:08:40 -0300
Subject: [PATCH] changing stop signal to shutdown systemd gracefully

---
 systemd/centos7/Dockerfile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/systemd/centos7/Dockerfile b/systemd/centos7/Dockerfile
index 46aa748c..f447c049 100644
--- a/systemd/centos7/Dockerfile
+++ b/systemd/centos7/Dockerfile
@@ -12,6 +12,10 @@ rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
 rm -f /lib/systemd/system/basic.target.wants/*;\
 rm -f /lib/systemd/system/anaconda.target.wants/*;
 
+# Systemd defines that it expects SIGRTMIN+3 for graceful shutdown
+# https://www.commandlinux.com/man-page/man1/systemd.1.html#lbAH
+STOPSIGNAL SIGRTMIN+3
+
 VOLUME [ "/sys/fs/cgroup" ]
 
 CMD ["/usr/sbin/init"]