centos*系统初始化操作

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　　系统初始化避免一些繁琐的优化：
　　1、修改主机名：
             hostnamectl set-hostname xxxxxx　　2、修改/etc/hosts
            若是集群则将需要的集群添加到/etc/hosts

            ip port　　3、精简开机启动：
            for server in `chkconfig --list|egrep -v 'crond|network|rsyslog|sshd|sysstat|ntpd'|awk '{print $1}'`;do chkconfig $server off; done　　4、更换阿里云镜像
            mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
            mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
            CentOS 6
            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
            CentOS 7
            wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
            wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo　　

　　5、关闭selinux、iptables
           /etc/init.d/iptables stop
           chkconfig iptables off
           vim /etc/selinux/config
           SELINUX=disabled
           setenforce 0　　6、修改最大文件描述符
            [root@lvs-node02 ~]# vim /etc/security/limits.conf
            * soft nofile 655350
            * hard nofile 655350
            *  soft  nproc   655350
            *  hard  nproc   655350
            # End of file
            [root@lvs-node02 ~]# ulimit -n 655350　　7、修改历史命令记录

            vim /etc/profile
            export HISTTIMEFORMAT="%F %T `whoami`:"
            export TMOUT=2000
            export PROMPT_COMMAND='{ msg=$(history 1 | { read x y; echo $y; }); logger "[euid=$(whoami)]":$(who am i):[`pwd`]"$msg";}'
            :wq
            export PS1='\[\e[32m\][\u@h \W]#\e[m\] '
            source /etc/profile　　8、内核优化：
vim /etc/sysctl.conf
# ------------- Kernel Optimization -------------
net.ipv4.tcp_max_tw_buckets = 2000000
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_wmem = 4096 16384 4194304
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.netdev_max_backlog = 262144
net.ipv4.tcp_orphan_retries = 3
net.core.somaxconn = 26214
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_tw_buckets = 50000
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 20
net.ipv4.tcp_keepalive_time = 1024
net.ipv4.ip_local_port_range = 1024 65000
vm.max_map_count = 200000
vm.zone_reclaim_mode = 1
vm.dirty_ratio = 10
fs.file-max = 12553500
fs.nr_open = 12453500
vm.swappiness = 0
net.ipv4.conf.default.rp_filter = 2
net.ipv4.conf.all.rp_filter = 2
net.ipv4.conf.all.send_redirects = 1
net.ipv4.conf.default.send_redirects = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_fack = 1
net.ipv4.tcp_dsack = 1
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
kernel.pid_max = 65535
net.ipv4.tcp_rmem = 4096 87380 8388608
net.ipv4.tcp_wmem = 4096 87380 8388608
net.core.rmem_max = 8388608
net.core.wmem_max = 8388608
net.core.netdev_max_backlog = 5000
net.ipv4.tcp_window_scaling = 1
sysctl -p

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