CentOS7系统初始化个人配置

以下内容为个人最小化安装后的配置步骤

更换yum源为阿里云

yum install -y epel-release lrzsz wget yum-axelget
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
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
yum clean all
yum makecache

安装一些基础工具

yum install -y vim gcc gcc-c++ python3 python3-pip curl net-tools unzip sysstat tcpdump rsync supervisor iptables iotop yum-utils yum-axelget tree dos2unix ntp fio mlocate lsof

关闭NetworkManager

systemctl stop NetworkManager && systemctl disable NetworkManager

关闭selinux

setenforce 0
sed -i 's/^SELINUX=.*$/SELINUX=disabled/' /etc/selinux/config

系统参数调整

cat >> /etc/sysctl.conf << EOF
net.ipv4.ip_forward = 1
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.core.somaxconn = 2048  
net.ipv4.ip_local_port_range= 1024 65535
net.core.rmem_default = 262144
net.core.wmem_default = 262144
fs.file-max = 104857
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 4096 16777216
net.ipv4.tcp_wmem = 4096 4096 16777216
net.ipv4.tcp_mem = 786432 3145728  4194304
net.ipv4.tcp_max_syn_backlog = 16384
net.core.netdev_max_backlog = 20000
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_max_orphans= 131072
EOF
sysctl -p

关闭swap

swapoff -a
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

关闭firewalld

systemctl stop firewalld.service && systemctl disable firewalld.service

设定ntp时间同步

yum install ntp -y
# 设置时区
timedatectl set-timezone Asia/Shanghai
# 或
mv /etc/localtime /etc/localtime_bak
cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
# 手动同步时间
ntpdate asia.pool.ntp.org
# 修改/etc/ntp.conf，将原有的几个server注释，改为
server time1.cloud.tencent.com
server time2.cloud.tencent.com
server time3.cloud.tencent.com
server time4.cloud.tencent.com
server time5.cloud.tencent.com
# 启动ntpd
systemctl start ntpd
systemctl enable ntpd

设置history时间戳

echo 'export HISTTIMEFORMAT="%F %T  `whoami` "' >> /etc/profile && source /etc/profile

修改vimrc

1. vim /etc/vimrc

2. 追加以下内容

set smarttab
set tabstop=4
set expandtab
set softtabstop=4
set shiftwidth=4
set nobackup
set noswapfile
set encoding=utf-8
syntax on
set hlsearch

增加最大文件数限制

cat >> /etc/security/limits.conf <<EOF
* soft nofile 65535
* hard nofile 65535
EOF