redis-07-redis启动警告处理

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#redis #redis启动警告

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本文针对Redis 3.2.8版本在启动过程中可能出现的三种警告信息提供了详细的临时及永久解决方案，包括调整TCP backlog设置、解决内存过承诺问题及禁用透明大页功能。

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警告1
警告2
警告3

在redis-3.2.8安装完之后启动过程中可能会有警告信息。

以下是处理方法:

警告1

3493:M 31 Mar 21:52:23.684 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.

临时解决方案

$ sysctl -w net.core.somaxconn = 1024

永久解决方案

$ vim /etc/sysctl.conf
# 增加如下一行
net.core.somaxconn= 1024
# 之后使配置生效
$ sysctl -p

警告2

3493:M 31 Mar 21:52:23.684 # 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.

临时解决方案

$ sysctl -w vm.overcommit_memory = 1

永久解决方案

$ vim /etc/sysctl.conf
# 增加如下一行
vm.overcommit_memory = 1
# 之后使配置生效
$ sysctl -p

警告3

3493:M 31 Mar 21:52:23.685 # 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.

临时解放方案

$ echo never > /sys/kernel/mm/transparent_hugepage/enabled

永久解决方案

$ vim /etc/rc.local
# 最后一行增加
echo never > /sys/kernel/mm/transparent_hugepage/enabled