Redis 启动警告解决

Redis 启动警告解决【转】

[root@centos224]# service redisd start
21985:M 24 Nov 04:07:20.376 * Increased maximum number of open files to 10032 (it was originally set to 1024).
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           _.-``__ ''-._                                             
      _.-``    `.  `_.  ''-._           Redis 3.2.1 (00000000/0) 64 bit
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 (    '      ,       .-`  | `,    )     Running in standalone mode
 |`-._`-...-` __...-.``-._|'` _.-'|     Port: 6379
 |    `-._   `._    /     _.-'    |     PID: 21985
  `-._    `-._  `-./  _.-'    _.-'                                   
 |`-._`-._    `-.__.-'    _.-'_.-'|                                  
 |    `-._`-._        _.-'_.-'    |           http://redis.io        
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 |`-._`-._    `-.__.-'    _.-'_.-'|                                  
 |    `-._`-._        _.-'_.-'    |                                  
  `-._    `-._`-.__.-'_.-'    _.-'                                   
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21985:M 24 Nov 04:07:20.428 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
21985:M 24 Nov 04:07:20.428 # Server started, Redis version 3.2.1
21985:M 24 Nov 04:07:20.428 # 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.
21985:M 24 Nov 04:07:20.428 # 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.
21985:M 24 Nov 04:07:20.442 * DB loaded from disk: 0.014 seconds
21985:M 24 Nov 04:07:20.443 * The server is now ready to accept connections on port 6379

警告：

Increased maximum number of open files to 10032 (it was originally set to 1024).

解决办法：

#查看系统限制
[root@centos224]# ulimit -a

#设置“open files”数量
[root@centos224]# ulimit -n 10032

#或者设置用户限制
[root@centos224]# vi /etc/security/limits.conf

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.

解决办法：

[root@centos224]# echo 511 >/proc/sys/net/core/somaxconn
[root@centos224]# echo "net.core.somaxconn = 551" > /etc/sysctl.conf

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.

解决办法：

[root@centos224]# echo 1 > /proc/sys/vm/overcommit_memory
[root@centos224]# echo "vm.overcommit_memory=1" >> /etc/sysctl.conf

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：

[root@centos224]# echo never > /sys/kernel/mm/transparent_hugepage/enabled
[root@centos224]# vi /etc/rc.local
if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
   echo never > /sys/kernel/mm/transparent_hugepage/enabled
fi
if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
   echo never > /sys/kernel/mm/transparent_hugepage/defrag
fi

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