From 79930048db4e8a1e4bd6512922bd78e440e50e4c Mon Sep 17 00:00:00 2001
From: Takuya ASADA <syuu@scylladb.com>
Date: Tue, 28 Jul 2020 02:20:58 +0900
Subject: [PATCH] scylla_post_install.sh: generate memory.conf for CentOS7

On CentOS7, systemd does not support percentage-based parameter.
To apply memory parameter on CentOS7, we need to override the parameter
in bytes, instead of percentage.

Fixes #6783

(cherry picked from commit 3a25e7285ba6dadb2e6990dc21011777148e70fe)
---
 scylla_post_install.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/scylla_post_install.sh b/scylla_post_install.sh
index 411295ce14..fddff31222 100755
--- a/scylla_post_install.sh
+++ b/scylla_post_install.sh
@@ -63,6 +63,17 @@ MemoryHigh=1200M
 MemoryMax=1400M
 MemoryLimit=1400M
 EOS
+
+# On CentOS7, systemd does not support percentage-based parameter.
+# To apply memory parameter on CentOS7, we need to override the parameter
+# in bytes, instead of percentage.
+elif [ "$RHEL" -a "$VERSION_ID" = "7" ]; then
+    MEMORY_LIMIT=$((MEMTOTAL_BYTES / 100 * 5))
+    mkdir -p /etc/systemd/system/scylla-helper.slice.d/
+    cat << EOS > /etc/systemd/system/scylla-helper.slice.d/memory.conf
+[Slice]
+MemoryLimit=$MEMORY_LIMIT
+EOS
 fi
 
 systemctl --system daemon-reload >/dev/null || true