diff --git a/setup/README.md b/setup/README.md
index 1115056..c15ce4b 100644
--- a/setup/README.md
+++ b/setup/README.md
@@ -247,3 +247,13 @@ reboot
 ```
 
 Set `rc_cgroup_mode="unified`
+
+### memory overcommit
+
+https://redis.io/docs/latest/develop/get-started/faq/#background-saving-fails-with-a-fork-error-on-linux
+https://www.kernel.org/doc/Documentation/vm/overcommit-accounting
+
+```sh
+cd /etc/sysctl.d
+ln -vs /opt/container-server/setup/sysctl.d/* .
+```
diff --git a/setup/sysctl.d/redis-memory-overcommit.conf b/setup/sysctl.d/redis-memory-overcommit.conf
new file mode 100644
index 0000000..0cf386f
--- /dev/null
+++ b/setup/sysctl.d/redis-memory-overcommit.conf
@@ -0,0 +1 @@
+vm.overcommit_memory = 1