消除Redis启动时的三个警告

现象

问题分析

第一个警告:
  • WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128
第二个警告:
  • 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.
第三个警告:
  • 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.

解决办法

# 1.输入以下命令
[root@localhost ~]# echo "net.core.somaxconn = 511" >> /etc/sysctl.conf
[root@localhost ~]# echo "vm.overcommit_memory = 1" >> /etc/sysctl.conf
[root@localhost ~]# sysctl -p
[root@localhost ~]# echo "echo never > /sys/kernel/mm/transparent_hugepage/enabled" >> /etc/rc.local
[root@localhost ~]# source /etc/rc.local
# 2.启动 Redis 服务

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