系统网络连接数添加
[root@syjx-db ~]# grep -v "^#" /etc/sysctl.conf net.ipv4.ip_forward = 0 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.default.accept_source_route = 0 kernel.sysrq = 0 kernel.core_uses_pid = 1 net.ipv4.tcp_syncookies = 1 kernel.msgmnb = 65536 kernel.msgmax = 65536 kernel.shmmax = 68719476736 kernel.shmall = 4294967296 net.ipv6.conf.all.disable_ipv6=1 [root@syjx-db ~]# sysctl -p
验证
[root@syjx-db ~]# grep -v "^#" /etc/security/limits.conf * soft nproc 65535 * hard nproc 65535 * soft nofile 65535 * hard nofile 65535 [root@syjx-db ~]# sysctl -p
【关闭ipv6】
lsmod | grep ipv6
ifconfig -a 可看到ipv6地址。
关闭
/etc/modprobe.d/dist.conf
结尾添加:
alias net-pf-10 off
alias ipv6 off
重启
ifconfig -a 看不到ipv6地址
【U盘】
查看
lsmod | grep usb
加载U盘、移动硬盘模块modprobe usb-storage
tcp参数sysctl优化网络连接
#最大timewait net.ipv4.tcp_max_tw_buckets = 6000 #启用SACK有选择应答 net.ipv4.tcp_sack = 1 #启用tcp窗口>64k net.ipv4.tcp_window_scaling = 1 #socket接收内存字节 net.ipv4.tcp_rmem = 8760 256960 4088000 #socket发送内存字节 net.ipv4.tcp_wmem = 8760 256960 4088000 #tcp数据接收窗口字节默认值 net.core.rmem_default = 256960 #tcp数据发送窗口字节默认值 net.core.wmem_default = 256960 #tcp数据接收窗口字节最大值 net.core.rmem_max = 513920 #tcp数据发送窗口字节最大值 net.core.wmem_max = 513920 #数据包排队列队最大长度 net.core.netdev_max_backlog = 2000 #每个端口最大监听队列长度 net.core.somaxconn = 2048 #不属于任何进程的socket数量 net.ipv4.tcp_max_orphans = 65536 #未确认请求SYN队列长度 net.ipv4.tcp_max_syn_backlog = 262144 #tcp头时间戳,开启后tw_reuse才能生效 net.ipv4.tcp_timestamps = 1 #SYN+ACK包放弃前的重试次数 net.ipv4.tcp_synack_retries = 1 #SYN放弃前的重试次数 net.ipv4.tcp_syn_retries = 1 #timewait快速回收,会影响NAT用户访问,关闭 net.ipv4.tcp_tw_recycle = 0 #启用timewait重用 net.ipv4.tcp_tw_reuse = 1 #tcp栈内存页 net.ipv4.tcp_mem = 131072 262144 524288 #发起端已断开后的保持时间(秒) net.ipv4.tcp_fin_timeout = 1 #keepalive心跳间隔时间(秒) net.ipv4.tcp_keepalive_time = 30 #TCP/UDP协议可使用本地端口号范围 net.ipv4.ip_local_port_range = 1024 65000
ulimit修改
vi /etc/security/limits.conf * soft nproc 65535 * hard nproc 65535 * soft nofile 65535 * hard nofile 65535
重新登陆生效
验证:
ulimit -a
查看open files
echo "* soft nproc 65535" >> /etc/security/limits.conf echo "* hard nproc 65535" >> /etc/security/limits.conf echo "* soft nofile 65535" >> /etc/security/limits.conf echo "* hard nofile 65535" >> /etc/security/limits.conf
禁用ipv6
ip a 查看由ipv6地址。
1.配置syctl
检查,输出为0,则需要配置。
cat /proc/sys/net/ipv6/conf/all/disable_ipv6
vi /etc/sysctl.conf,添加:
net.ipv6.conf.all.disable_ipv6=1
2.配置network
vi /etc/sysconfig/network,添加
NETWORKING_IPV6=no
3.检查网卡
网卡中没有ipv6配置项
4.重启服务,或重启服务器
systl -p
service network resart
其他:
克隆后网卡起不来:
编辑/etc/udev/rules.d/70-persistent-net.rules
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