Redis 启动警告解决

Redis (1.9万) 2017-09-14 10:13:16
[root@tiejiang]# service redisd start
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

#查看系统限制  
[root@tiejiang]# ulimit -a  
  
#设置“open files”数量  
[root@tiejiang]# ulimit -n 10032  
  
#或者设置用户限制  
[root@tiejiang]# 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

[root@tiejiang]# echo 511 >/proc/sys/net/core/somaxconn  
[root@tiejiang]# 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

[root@tiejiang]# echo 1 > /proc/sys/vm/overcommit_memory  
[root@tiejiang]# 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

[root@tiejiang]# echo never > /sys/kernel/mm/transparent_hugepage/enabled  
[root@tiejiang]# 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
THE END