在EC2上解决Ubuntu 16.04的overcommit_memory和Transparent Huge页面上的Redis警告

Question

在新的Ubuntu 16.04 EC2实例上，警告显示如下：

WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.

如何永久消除它们？

Answer 1

就像警告所示，只需将行vm.overcommit_memory=1添加到/etc/sysctl.conf的底部，使用类似sudo vi /etc/sysctl.conf 。

但权限不允许您按照警告的建议编辑THP，所以改为

sudo apt install hugepages

并使用sudo vi ~/.bashrc类的sudo vi ~/.bashrc将命令sudo hugeadm --thp-never到.bashrc的底部。

然后只需sudo reboot ，下次你在运行redis-server时SSH，警告就消失了！