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centos服务器安装配置
一、安装系统完毕后关闭以下服务
1、firewall和configuration-disable
2、sysytem services 保留:crond、network、sshd
二、新建账户,并设置允许新账户能sudo到root,禁止root账户ssh远程登陆
#useradd lswang
#passwd lswang
#chmod 777 /etc/sudoers
#vim /etc/sudoers
查找/root yyp 修改lswang
#chmod 440 /etc/sudoers
#vim /etc/ssh/sshd_config
查找/#PermitRootLogin 去掉#,改yes为no
#/etc/init.d/sshd restart
三、Web服务器装机优化步骤
1、打开/etc/security/limits.conf文件,在End of file上面加上两句 (打开最大文件连接数)
* soft nofile 51200
* hard nofile 51200
2、打开/etc/sysctl.conf文件,在最后边插入如下语句:(优化内核)
kernel.shmall = 268435456
net.ipv4.tcp_max_syn_backlog = 65536
net.core.netdev_max_backlog = 32768
net.core.somaxconn = 32768
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_tw_recycle = 1
#net.ipv4.tcp_tw_len = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 120
net.ipv4.ip_local_port_range = 1024 65535
然后执行以下命令使配置生效:
#/sbin/sysctl -p
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