centos*系统初始化操作
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 $server off; done 4、更换阿里云镜像
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
CentOS 6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo
CentOS 7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
5、关闭selinux、iptables
/etc/init.d/iptables stop
chkconfig iptables off
vim /etc/selinux/config
SELINUX=disabled
setenforce 0 6、修改最大文件描述符
# vim /etc/security/limits.conf
* soft nofile 655350
* hard nofile 655350
*softnproc 655350
*hardnproc 655350
# End of file
# ulimit -n 655350 7、修改历史命令记录
vim /etc/profile
export HISTTIMEFORMAT="%F %T `whoami`:"
export TMOUT=2000
export PROMPT_COMMAND='{ msg=$(history 1 | { read x y; echo $y; }); logger "":$(who am i):[`pwd`]"$msg";}'
:wq
export PS1='\[\e[\u@h \W]#\e '
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
感谢楼主分享！
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