diff --git a/access.lua b/access.lua
index 2cd5118..77951d5 100644
--- a/access.lua
+++ b/access.lua
@@ -2,7 +2,6 @@
 -- Load configuration
 --
 cache = ngx.shared.cache
-srvkey = cache:get("srvkey")
 oneweek = 60 * 60 * 24 * 7
 cookies = {}
 local conf_file = assert(io.open(conf_path, "r"), "Configuration file is missing")
diff --git a/init.lua b/init.lua
index 41f67d1..2876d81 100644
--- a/init.lua
+++ b/init.lua
@@ -11,8 +11,17 @@ math = require "math"
 hige = require "hige"
 
 -- Set random key
-math.randomseed(os.time())
-ngx.shared.cache:add("srvkey", math.random(1111111, 9999999))
+local file = io.open("/tmp/ngx_srvkey","r")
+if file ~= nil then
+    srvkey = file:read("*all")
+    file:close()
+else
+    local file = io.open("/tmp/ngx_srvkey","w")
+    math.randomseed(os.time())
+    srvkey = tostring(math.random(1111111, 9999999))
+    file:write(srvkey)
+    file:close()
+end
 
 -- Shared table
 flashs = {}