系统初始化

begining.sh

#!/usr/bin/bash

#定义关联数组，输出结果上色，图个好看
color(){
unset col
declare -A col=([Error]=31 [Success]=32 [Warning]=33 [Info]=34)
printf “\033[${c[$1]}m%-10s%-10s %-30s\033[0m\n” “[`date +%T`]” “($1)” “$2”
sleep 0.5
}

static_addr(){
ifname=$(ip -f inet a | awk ‘/^2/{print $2}’)
ifname=$(echo ${ifname/:/})
ipaddr=$(ip -f inet a show dev $ifname | awk ‘/inet/{print $2}’ | awk -F’/’ ‘{print $1}’)
prefix=$(ip -f inet a show dev $ifname | awk ‘/inet/{print $2}’ | awk -F’/’ ‘{print $2}’)
gateway=$(ip r |awk ‘/default/{print $3}’)
cat > /etc/sysconfig/network-scripts/ifcfg-$ifname <<EOF
TYPE=”Ethernet”
PROXY_METHOD=”none”
BROWSER_ONLY=”no”
BOOTPROTO=”static”
DEFROUTE=”yes”
IPV4_FAILURE_FATAL=”no”
NAME=”${ifname}“
UUID=”`uuidgen`”
DEVICE=”${ifname}“
ONBOOT=”yes”
IPADDR=${ipaddr}
PREFIX=${prefix}
GATEWAY=${gateway}
DNS1=${gateway}
DNS2=114.114.114.114
DNS3=8.8.8.8
EOF
systemctl restart network
ping -w2 -c2 www.baidu.com &>/dev/null && return 10 || return 20
}

#配置阿里云yum源
aliyun_yum_make(){
EOF
fi
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo && yum repolist && yum clean all && yum makecache && \
color Success “本地源配置完成” || color Error “yum配置错误，可以\ncd /etc/yum.repos.d/ && rm -rf centos7.repo && rename .repo.bak .repo *.repo.bak \n使用手动恢复历史yum源”
}

init(){
# 系统信息采集
color Info “当前用户 $USER”
color Info “当前时间 `date “+%F %X”`”
echo 3 >/proc/sys/vm/drop_caches
color Info “当前内存 $(free |awk ‘NR==2{print $4/1024}’)M”
color Info “当前核心 $(grep -E ‘^processor’ /proc/cpuinfo|wc -l)个”
color Info “核心品牌 $(grep -E ‘^model name’ /proc/cpuinfo |head -n 1 |awk -F: ‘{print $2}’)”
color Info “启动时长 $(uptime |awk -F’,’ ‘{print $1}’)”
color Success “开始配置静态ip”

#对jvm虚拟机和elk集群有帮助
cat >>/etc/security/limits.conf <<EOF
* soft nofile 65535
* hard nofile 65535
* soft nproc 1024
* hard nproc 1024
EOF
color Success “已经优化系统文件打开数、进程打开数”

#路由转发可用于lvs中nat模式下的proxy服务器
echo “net.ipv4.ip_forward=1” >> /etc/sysctl.conf
color Success “已经开启系统路由转发”

#默认注释即开启，关闭dns反向解析，加快ssh连接速度，对ansibel有帮助
sed -i ‘s/#UseDNS.*/UseDNS no/’ /etc/ssh/sshd_config
color Success “已经优化ssh服务连接速度”
static_addr
if [ $? -eq 10 ];then
color Success “静态ip配置并检测完成”
else
color Error “静态ip配置异常”
fi
color Info “正在关闭防火墙、selinux”
color Warning “注意，这将降低服务器安全性”
systemctl disable firewalld
if [ `getenforce` = ‘Enforcing’ ];then
setenforce 0
fi
sed -i ‘s/SELINUX=.*/SELINUX=disabled/g’ /etc/selinux/config && \
color Success “配置完成” || color Error “配置异常，请检查”
color Info “配置yum源, 此操作将备份您的历史源”
aliyun_yum_make

color Info “开始安装常用软件”
yum install -y wget unzip vim yum-utils httpd-tools psacct net-tools nc ntpdate jq htop bash-completion && \
color Success “安装完成” || color Warning “部分包可能失败”
color Info “开始进行时间校准”
ntpdate ntp.aliyun.com && \
# 修改时间到硬件
clock -w
#保存时间到硬件
hwclock -s
color Success “时间校准完成”

echo {“time”: “`date +’%F %T’`”} > /tmp/.init
}
if [ -f /tmp/.init ];then
color Success “检测到此前已进行初始化，如需重新执行，请删除: rm -f /tmp/.init”
exit 0
fi
init
color Success “初始化完成”