Redis啓動警告解決

[gpp@goldpanpan 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：

[root@goldpanpan ~]# echo 511 >/proc/sys/net/core/somaxconn
[root@goldpanpan ~]# 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.

---

[root@goldpanpan ~]# echo 1 > /proc/sys/vm/overcommit_memory
[root@goldpanpan ~]# 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.

---

[root@goldpanpan ~]# echo never > /sys/kernel/mm/transparent_hugepage/enabled
[root@goldpanpan ~]# 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

ps:以上命令需管理員用戶下執行