一、系统优化配置 1、修改yum源 配置国内yum源 阿里云yum源地址
#CentOS 5.xwget -O /etc/yum.repos.d/CentOS-Base.repo /repo/Centos-5.repo#CentOS 6.xwget -O /etc/yum.repos.d/CentOS-Base.repo /repo/Centos-6.repo#CentOS 7.xwget -O /etc/yum.repos.d/CentOS-Base.repo /repo/Centos-7.repo
163 yum 源地址
# CentOS 5.xwget /.help/CentOS5-Base-163.repo# CentOS 6.xwget /.help/CentOS6-Base-163.repo
yum clean all yum makecache yum update yum upgrade 跟新系统到最新 2、安装软件包 yum -y install lrzsz sysstat 安装后的基本调优 设置 关闭所有的服务 for vick in 'chkconfig --list|grep 3:on|awk 'print $1';do chkconfig --level 3 $vick off;done 启动服务的内容 for vick in crond network syslog sshd;do chkconfig --level 3 $vick on ;done 查看3级别的启动状态 chkconfig --list |grep 3:on 更改ssh 登入配置 cp /etc/ssh/sshd_config /etc/ssh/sshd_config.bak vim /etc/ssh/sshd_config #####vick###### Port 99#修改ssh连接默认端口 PermitRootLogin no#禁止root远程登入 PermitEmptyPasswords no #禁止空密码登入 UseDNS no #不使用 DNS #####vick###### sudo 设置 visudo /root ## Allow root to run any commands anywhere root ALL=(ALL) ALL vick ALL=(ALL) ALL $PATH vim ~/.bash_profile source ~/.bash_profile echo $PATH 字符集调整 echo 'LANG="zh_CN.GB18030"' > /etc/sysconfig/i18n source /etc/sysconfig/i18n 服务器时间同步 echo '*/5 * * * * /usr/sbin/ntpdate >/dev/null 2>&1' >> /var/spool/cron/root 修改描述符 echo '* - nofile 65535'>> /etc/security/limits.conf ulimit -n 查看描述符字符集大小 调整内核参数 vim /etc/sysctl.conf 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 = 360000 net.ipv4.route.gc_timeout = 100 net.ipv4.tcp_syn_retries = 1 net.ipv4.tcp_synack_retries = 1 net.ipv4.ip_conntrack_max = 25000000
