prometheus-node-exporter-lua: close io.popen files to reap zombies

Signed-off-by: Leonid Evdokimov <leon@darkk.net.ru>

1 files changed, 5 insertions, 1 deletions

diff --git a/utils/prometheus-node-exporter-lua/files/usr/lib/lua/prometheus-collectors/uname.lua b/utils/prometheus-node-exporter-lua/files/usr/lib/lua/prometheus-collectors/uname.lua
index 9874b53a9..75a366e3b 100644
--- a/utils/prometheus-node-exporter-lua/files/usr/lib/lua/prometheus-collectors/uname.lua
+++ b/utils/prometheus-node-exporter-lua/files/usr/lib/lua/prometheus-collectors/uname.lua
@@ -1,12 +1,16 @@
+local uname_fd = io.popen("uname -m")
+
 local labels = {
   domainname = "",
   nodename = "",
   release = string.sub(get_contents("/proc/sys/kernel/osrelease"), 1, -2),
   sysname = string.sub(get_contents("/proc/sys/kernel/ostype"), 1, -2),
   version = string.sub(get_contents("/proc/sys/kernel/version"), 1, -2),
-  machine = string.sub(io.popen("uname -m"):read("*a"), 1, -2)
+  machine = string.sub(uname_fd:read("*a"), 1, -2)
 }
 
+uname_fd:close()
+
 local function scrape()
   labels["domainname"] = string.sub(get_contents("/proc/sys/kernel/domainname"), 1, -2)
   labels["nodename"] = string.sub(get_contents("/proc/sys/kernel/hostname"), 1, -2)