查看redis最大连接数:CONFIG GET maxclients

执行**：_sudo vi /etc/sysctl.conf，**_添加以下内容：

net.ipv4.tcp_syncookies = 0
fs.file-max = 12553500
fs.nr_open = 12453500
kernel.shmall= 1048576
kernel.shmmax = 1887436
kernel.msgmax = 65536
kernel.sysrq = 0
kernel.pid_max= 65536
net.core.netdev_max_backlog = 2000000
net.core.rmem_default = 699040
net.core.rmem_max = 50331648
net.core.wmem_default = 131072
net.core.wmem_max = 33554432
net.core.somaxconn = 65535
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_mem = 1048576 1572864 2097152
net.ipv4.tcp_rmem = 4096 4194304 8388608
net.ipv4.tcp_wmem = 4096 4194304 8388608
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_window_scaling = 1
vm.swappiness = 0
 
#TCP connection recovery
net.ipv4.tcp_max_tw_buckets = 6000000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 10
net.ipv4.route.max_size = 5242880
net.ipv4.ip_forward = 1
net.ipv4.tcp_timestamps = 1
#开启对于TCP时间戳的支持,若该项设置为0，则下面一项设置不起作用
 
#TCP connection manager
net.ipv4.tcp_max_syn_backlog = 655360
net.ipv4.tcp_syn_retries = 6
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_retries2 = 6
 
#TCP keepalive
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.tcp_keepalive_time = 30
net.ipv4.tcp_keepalive_intvl = 30
net.ipv4.tcp_keepalive_probes = 3
fs.inotify.max_user_watches=524288

sysctl -p

修改openfile参数

方法一：临时修改生效

修改openfile参数为100000，命令如下： ulimit -SHn 100000 只对当前session生效

方法二：修改配置文件，登录生效

修改/etc/security/limits.conf文件，在文件中添加如下行：

*   soft nofile 100000
*   hard nofile 100000

此方法需要重新登录session才能生效