[[email protected] src]$ 25342:C 14 Nov 11:08:48.118 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
25342:C 14 Nov 11:08:48.118 # Redis version=4.0.11, bits=64, commit=00000000, modified=0, pid=25342, just started
25342:C 14 Nov 11:08:48.118 # Warning: no config file specified, using the default config. In order to specify a config file use ./redis-server /path/to/redis.conf
25342:M 14 Nov 11:08:48.120 # Not listening to IPv6: unsupproted
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 4.0.11 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    '      ,       .-`  | `,    )     Running in standalone mode
 |`-._`-...-` __...-.``-._|'` _.-'|     Port: 6379
 |    `-._   `._    /     _.-'    |     PID: 25342
  `-._    `-._  `-./  _.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |           http://redis.io
  `-._    `-._`-.__.-'_.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |
  `-._    `-._`-.__.-'_.-'    _.-'
      `-._    `-.__.-'    _.-'
          `-._        _.-'
              `-.__.-'

25342:M 14 Nov 11:08:48.121 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
25342:M 14 Nov 11:08:48.121 # Server initialized
25342:M 14 Nov 11:08:48.121 # 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.
25342:M 14 Nov 11:08:48.121 # 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.
25342:M 14 Nov 11:08:48.121 * Ready to accept connections
 

警告1：

WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.

解決：

[[email protected] ~]# echo 511 >/proc/sys/net/core/somaxconn
[[email protected] ~]# echo "net.core.somaxconn = 551" > /etc/sysctl.conf

警告2：

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.
 

解決：

[[email protected] ~]# echo 1 > /proc/sys/vm/overcommit_memory
[[email protected] ~]# echo "vm.overcommit_memory=1" >> /etc/sysctl.conf

警告3：

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.
 

解決：

[[email protected] ~]# echo never > /sys/kernel/mm/transparent_hugepage/enabled
[[email protected] ~]# vim /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

 以上命令需在管理員使用者下執行，否則提示無許可權