标签：tables network 自启 off 字符集 sudo filter 建议 中文乱码
1、查看linux版本
cat /etc/redhat-release
#CentOS release 6.9 (Final) ————>查看版本号 uname -m #x86_64 ————>查看系统64位/32位 uname -r #2.6.32-696.el6.x86_64 ——————>内核版本
2、关闭selinux和iptables
sed -i ‘s#=enforcing#=disabled#g‘ /etc/selinux/config setenforce 0 #——————>临时关闭 getenforce /etc/init.d/iptables stop chkconfig iptables off
3、更改字符集，支持中文，但不建议最好用英文字符集，防止乱码问题
echo $LANG en_US.UTF-8 #——————>查看系统字符集是否正确 LANG=en export LANG=en_US.utf8 #—————>临时生效解决中文乱码 echo "LANG=en_US.utf8" >/etc/sysconfig/i18n #——————>永久生效 source /etc/sysconfig/i18n #——————>立即让配置文件生效
4、精简开机自启动服务
export LANG=en chkconfig|egrep -v "crond|sshd|network|rsyslog|sysstat"|awk ‘{print "chkconfig",$1,"off"}‘|bash chkconfig --list|grep 3:on
5、时间同步
echo ‘#time sync by yanxinjiang at 2017-01-01‘ >>/var/spool/cron/root echo ‘*/5 * * * * /usr/sbin/ntpdate pool.ntp.org >/dev/null 2>&1‘ >>/var/spool/cron/root crontab -l
6、更改yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo
7、加大文件描述符
echo ‘* - nofile 65535 ‘ >>/etc/security/limits.conf
8、linux内核优化
cat >>/etc/sysctl.conf<<EOF 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 #以下参数是对iptables防火墙的优化，防火墙不开会提示，可以忽略不理。 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 EOF sysctl -p
9、SSH连接速度优化
sed -i.bak ‘s@#UseDNS yes@UseDNS no@g;s@^GSSAPIAuthentication yes@GSSAPIAuthentication no@g‘ /etc/ssh/sshd_config /etc/init.d/sshd reload
10、常用小工具安装
yum install lrzsz nmap tree dos2unix nc telnet -y
11、通过sudo提权普通用户管理
useradd oldboy echo 123456|passwd --stdin oldboy \cp /etc/sudoers /etc/sudoers.ori echo "oldboy ALL=(ALL) NOPASSWD: ALL " >>/etc/sudoers tail -1 /etc/sudoers visudo -c
标签：tables network 自启 off 字符集 sudo filter 建议 中文乱码
原文地址：http://www.cnblogs.com/yanxinjiang/p/7462905.html
