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  • Redis 启动警告解决

    Redis 启动警告解决【转】

    复制代码
    [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).
                    _._                                                  
               _.-``__ ''-._                                             
          _.-``    `.  `_.  ''-._           Redis 3.2.1 (00000000/0) 64 bit
      .-`` .-```.  ```/    _.,_ ''-._                                   
     (    '      ,       .-`  | `,    )     Running in standalone mode
     |`-._`-...-` __...-.``-._|'` _.-'|     Port: 6379
     |    `-._   `._    /     _.-'    |     PID: 21985
      `-._    `-._  `-./  _.-'    _.-'                                   
     |`-._`-._    `-.__.-'    _.-'_.-'|                                  
     |    `-._`-._        _.-'_.-'    |           http://redis.io        
      `-._    `-._`-.__.-'_.-'    _.-'                                   
     |`-._`-._    `-.__.-'    _.-'_.-'|                                  
     |    `-._`-._        _.-'_.-'    |                                  
      `-._    `-._`-.__.-'_.-'    _.-'                                   
          `-._    `-.__.-'    _.-'                                       
              `-._        _.-'                                           
                  `-.__.-'                                               
    
    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
    复制代码

    警告:

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

    解决办法:

    复制代码
    #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
    复制代码

    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:

    复制代码
    [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
    复制代码
     
     

    个人公众号谢谢各位老铁支持

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  • 原文地址:https://www.cnblogs.com/piwefei/p/9100145.html
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