From 1f55d38911cec5e597e7b10cc7324804c2ba063f Mon Sep 17 00:00:00 2001
From: Dan Smith <dansmith@redhat.com>
Date: Tue, 16 May 2017 08:50:53 -0700
Subject: [PATCH] Add systemd ulimit override function and set an override for
 NOFILE

This sets our default ulimit NOFILE to 2048, which is double what we
set things like mysql'd max_connections to.

Change-Id: I5126bed1e6b9f8c64db00eae4151ac61e47b1bf8
---
 functions | 16 ++++++++++++++++
 stack.sh  |  3 +++
 stackrc   |  3 +++
 3 files changed, 22 insertions(+)

diff --git a/functions b/functions
index f842f63038..bc2d26b496 100644
--- a/functions
+++ b/functions
@@ -720,6 +720,22 @@ function enable_kernel_bridge_firewall {
 }
 
 
+# Set a systemd system override
+#
+# This sets a system-side override in system.conf. A per-service
+# override would be /etc/systemd/system/${service}.service/override.conf
+function set_systemd_override {
+    local key="$1"
+    local value="$2"
+
+    local sysconf="/etc/systemd/system.conf"
+    iniset -sudo "${sysconf}" "Manager" "$key" "$value"
+    echo "Set systemd system override for ${key}=${value}"
+
+    sudo systemctl daemon-reload
+}
+
+
 # Restore xtrace
 $_XTRACE_FUNCTIONS
 
diff --git a/stack.sh b/stack.sh
index d6837ef5d0..e83eaea326 100755
--- a/stack.sh
+++ b/stack.sh
@@ -765,6 +765,9 @@ install_infra
 # Phase: pre-install
 run_phase stack pre-install
 
+# NOTE(danms): Set global limits before installing anything
+set_systemd_override DefaultLimitNOFILE ${ULIMIT_NOFILE}
+
 install_rpc_backend
 restart_rpc_backend
 
diff --git a/stackrc b/stackrc
index 35856ca73e..ea1bcdf3f0 100644
--- a/stackrc
+++ b/stackrc
@@ -925,6 +925,9 @@ fi
 # ``LOGDIR`` is always set at this point so it is not useful as a 'enable' for service logs
 # ``SCREEN_LOGDIR`` may be set, it is useful to enable the compat symlinks
 
+# System-wide ulimit file descriptors override
+ULIMIT_NOFILE=${ULIMIT_NOFILE:-2048}
+
 # Local variables:
 # mode: shell-script
 # End: