CentOS操作系统基础优化

内核优化

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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

1 2 3 4

* 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

1 2 3

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

关闭SELinux和防火墙

1 2 3 4

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

1 2 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