Redis 5.0.3默認配置啟動報錯解決方法

一、redis默認配置啟動報錯誤信息如下

# /usr/local/redis/bin/redis-server /usr/local/src/redis-5.0.3/redis.conf
5852:C 24 Jan 2019 23:00:07.676 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
5852:C 24 Jan 2019 23:00:07.676 # Redis version=5.0.3, bits=64, commit=00000000, modified=0, pid=5852, just started
5852:C 24 Jan 2019 23:00:07.676 # Configuration loaded
5852:M 24 Jan 2019 23:00:07.676 * Increased maximum number of open files to 10032 (it was originally set to 1024).
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 5.0.3 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    '      ,       .-`  | `,    )     Running in standalone mode
 |`-._`-...-` __...-.``-._|'` _.-'|     Port: 6379
 |    `-._   `._    /     _.-'    |     PID: 5852
  `-._    `-._  `-./  _.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |           http://redis.io
  `-._    `-._`-.__.-'_.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |
  `-._    `-._`-.__.-'_.-'    _.-'
      `-._    `-.__.-'    _.-'
          `-._        _.-'
              `-.__.-'

5852:M 24 Jan 2019 23:00:07.677 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
5852:M 24 Jan 2019 23:00:07.677 # Server initialized
5852:M 24 Jan 2019 23:00:07.677 # 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.
5852:M 24 Jan 2019 23:00:07.677 # 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.
5852:M 24 Jan 2019 23:00:07.677 * Ready to accept connections

 二、解決方法

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.

# 對一個高負載的環境來說tcp設置128這個值，太小了。

臨時生效
echo 1024 > /proc/sys/net/core/somaxconn

永久生效
vim /etc/sysctl.conf
net.core.somaxconn = 1024
sysctl -p

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.

# overcommit_memory參數說明：
設置內存分配策略（可選，根據服務器的實際情況進行設置）
/proc/sys/vm/overcommit_memory
可選值：0、1、2。
0、表示內核將檢查是否有足夠的可用內存供應用進程使用；如果有足夠的可用內存，內存申請允許；否則，內存申請失敗，並把錯誤返回給應用進程。
1、表示內核允許分配所有的物理內存，而不管當前的內存狀態如何。
2、表示內核允許分配超過所有物理內存和交換空間總和的內存

臨時生效
echo 1 > /proc/sys/vm/overcommit_memory

永久生效
vim /etc/syctl.conf
vm.overcommit_memory = 1
sysctl -p


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.

# 你使用的是透明大頁，可能導致redis延遲和內存使用問題。

臨時生效
echo never > /sys/kernel/mm/transparent_hugepage/enabled

永久生效
vim /etc/rc.local
if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
    echo never > /sys/kernel/mm/transparent_hugepage/enabled
fi

chmod +x /etc/rc.local

 三、修改后啟動無報錯狀態

# /usr/local/redis/bin/redis-server /usr/local/src/redis-5.0.3/redis.conf
1228:C 24 Jan 2019 23:26:50.044 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
1228:C 24 Jan 2019 23:26:50.044 # Redis version=5.0.3, bits=64, commit=00000000, modified=0, pid=1228, just started
1228:C 24 Jan 2019 23:26:50.044 # Configuration loaded
1228:M 24 Jan 2019 23:26:50.044 * Increased maximum number of open files to 10032 (it was originally set to 1024).
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 5.0.3 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    '      ,       .-`  | `,    )     Running in standalone mode
 |`-._`-...-` __...-.``-._|'` _.-'|     Port: 6379
 |    `-._   `._    /     _.-'    |     PID: 1228
  `-._    `-._  `-./  _.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |           http://redis.io
  `-._    `-._`-.__.-'_.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |
  `-._    `-._`-.__.-'_.-'    _.-'
      `-._    `-.__.-'    _.-'
          `-._        _.-'
              `-.__.-'

1228:M 24 Jan 2019 23:26:50.045 # Server initialized
1228:M 24 Jan 2019 23:26:50.045 * DB loaded from disk: 0.000 seconds
1228:M 24 Jan 2019 23:26:50.045 * Ready to accept connections