<pre class="brush:cpp;toolbar:false">[root@localhost202redis-2.8.19]#/usr/local/redis/bin/redis-server>>/data/redis-start.txt#从定向到文件，方便我们查看，内容如下：
[root@localhost202redis-2.8.19]#cat/data/redis-start.txt
[6033]16Jan23:21:42.506#Warning:noconfigfilespecified,usingthedefaultconfig.Inordertospecifyaconfigfileuse/usr/local/redis/bin/redis-server/path/to/redis.conf
[6033]16Jan23:21:42.508*Increasedmaximumnumberofopenfilesto10032(itwasoriginallysetto1024).
[6033]16Jan23:21:42.509#Warning:32bitinstancedetectedbutnomemorylimitset.Setting3GBmaxmemorylimitwith'noeviction'policynow.
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|`-._`-...-`__...-.``-._|'`_.-'|Port:6379
|`-._`._/_.-'|PID:6033
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|`-._`-.__.-'_.-'|http://redis.io
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[6033]16Jan23:21:42.511#Serverstarted,Redisversion2.8.19
[6033]16Jan23:21:42.511#WARNINGovercommit_memoryissetto0!Backgroundsavemayfailunderlowmemorycondition.Tofixthisissueadd'vm.overcommit_memory=1'to/etc/sysctl.confandthenrebootorrunthecommand'sysctlvm.overcommit_memory=1'forthistotakeeffect.
[6033]16Jan23:21:42.511#WARNING:TheTCPbacklogsettingof511cannotbeenforcedbecause/proc/sys/net/core/somaxconnissettothelowervalueof128.
[6033]16Jan23:21:42.511*DBloadedfromdisk:0.000seconds
[6033]16Jan23:21:42.511*Theserverisnowreadytoacceptconnectionsonport6379
[6033|signalhandler](1421421706)ReceivedSIGINTschedulingshutdown...
[6033]16Jan23:21:46.643#Userrequestedshutdown...
[6033]16Jan23:21:46.643*SavingthefinalRDBsnapshotbeforeexiting.
[6033]16Jan23:21:46.663*DBsavedondisk
[6033]16Jan23:21:46.663#Redisisnowreadytoexit,byebye...</pre><p><br/></p><p>1、增加配置文件</p><p>2、配置maxmemory</p><p>3、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.</p><p></p><p>配置：</p><p>为了防止内存爆满导致系统崩溃，需要设置/etc/redis/*.cnf中的maxmemory</p><p>防止报错，可以调整内存分配策略</p><p>/etc/sysctl.conf 这个是Redis日志中可以看到的建议：</p><p> 添加vm.overcommit_memory=1保存，并执行：sysctl vm.overcommit_memory=1使之生效</p><p>/proc/sys/vm/overcommit_memory,这个里面就是overcommit_memory值，这个可以被上面的设置更新.</p><p> 0， 表示内核将检查是否有足够的可用内存供应用进程使用；如果有足够的可用内存，内存申请允许；否则，内存申请失败，并把错误返回给应用进程。</p><p> 1， 表示内核允许分配所有的物理内存，而不管当前的内存状态如何。</p><p> 2， 表示内核允许分配超过所有物理内存和交换空间总和的内存</p><p></p>