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内核优化

ECHOSTR='net.ipv4.tcp_fin_timeout = 2
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_keepalive_time =600
net.ipv4.ip_local_port_range = 4000    65000
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.route.gc_timeout = 100
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_synack_retries = 1
net.core.somaxconn = 16384
net.core.netdev_max_backlog = 16384
net.ipv4.tcp_max_orphans = 16384
net.nf_conntrack_max = 25000000
net.netfilter.nf_conntrack_max = 25000000
net.netfilter.nf_conntrack_tcp_timeout_established = 180
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 120
net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60
net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 120'
echo "$ECHOSTR" >> /etc/sysctl.conf &&\
modprobe ip_conntrack && modprobe bridge
echo "modprobe ip_conntrack" >> /etc/rc.local
echo "modprobe bridge" >> /etc/rc.local
/sbin/sysctl -p

文件描述符

/etc/security/limits.conf

*                hard    nofile          65535
*                soft    nofile          65535
*                hard    noproc          65535
*                soft    noproc          65535

更新yum源，安装epel源

vi /etc/yum.repo.d/CentOS-Base.repo 略

1	# yum install epel-release -y

系统时钟同步

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2
3

# yum install chrony -y
# systemctl start chronyd
# systemctl enable chronyd

关闭SELinux和防火墙

if [ -f /etc/selinux/config ]; then
  sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
  setenforce 0
fi

1 2	# systemctl stop firewalld # systemctl disable firewalld

调整系统字符集

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3

# echo 'export LC_ALL=C'>> /etc/profile
# echo 'export LANG=en_US.UTF-8' >> /etc/profile
# source /etc/profile

安装基础工具

1	# yum install wget net-tools telnet tree nmap sysstat lrzsz dos2unix -y