#!/bin/bash
# 时间: 2018-11-21
# 作者: HuYuan
# 描述: CentOS 7 初始化脚本
# 加载配置文件
if [ -n "${1}" ];then
/bin/sh ${1}
fi
# 可接受配置(shell 变量格式)
# INIT_HOSTNAME 主机名, 默认为 localhost
# INIT_NTPSERVER ntp 服务器, 默认为 ntp1.aliyun.com
# INIT_DNS1 dns 服务器
# INIT_DNS2
# INIT_DNS3
# INIT_ZABBIX_AGENT 是否安装 zabbix agent, 默认为 yes
# INIT_ZAB_VERSION zabbix agent 的版本, 默认为 3.4.11
# INIT_ZAB_SERVER zabbix server 的地址, 默认为 192.168.0.112
# INIT_ZAB_DOWNLOAD zabbix agent 的下载地址, 默认为阿里的 yum 仓库
# INIT_SSH_PORT ssh 监听端口, 默认 22
# INIT_SSH_DNS 是否启用 ssh dns 反解, 默认 no
# INIT_SSH_ROOT_LOGIN 是否允许 root 用户登录, 默认 yes
HOSTNAME=${INIT_HOSTNAME:-'localhost'}
NTPSERVER=${INIT_NTPSERVER:-'ntp1.aliyun.com'}
DNS1=${INIT_DNS1:-'114.114.114.114'}
DNS2=${INIT_DNS2:-'223.5.5.5'}
DNS3=${INIT_DNS3:-'8.8.8.8'}
ZABBIX_AGENT=${INIT_ZABBIX_AGENT:-'yes'}
ZABBIX_SERVER=${INIT_ZABBIX_SERVER:-'192.168.0.112'}
ZABBIX_VERSION=${INIT_ZABBIX_VERSION:-'3.4.11'}
ZABBIX_DOWNLOAD=${INIT_ZABBIX_DOWNLOAD:-'https://mirrors.aliyun.com/zabbix/zabbix/'}
SSH_PORT=${INIT_SSH_PORT:-'22'}
SSH_DNS=${INIT_SSH_DNS:-'no'}
SSH_ROOT_LOGIN=${INIT_SSH_ROOT_LOGIN:-'yes'}
ping -c 1 -w 3 114.114.114.114 &> /dev/null
if [ ${?} -ne 0 ];then
echo "系统初始化必须能够连接 Internet 网络"
exit 10
else
echo "nameserver 114.114.114.114" > /etc/resolv.conf
echo -e "\033[31m正在更新软件包\033[0m"
yum -y update &> /dev/null
yum -y install wget &> /dev/null
if [ ${?} -ne 0 ];then
echo -e "\033[31m安装wget失败， 退出${0}\033[0m"
exit 2
fi
fi
set_service() {
setenforce 0
sed -i 's#^SELINUX=.*#SELINUX=disabled#' /etc/sysconfig/selinux
sed -i 's#^SELINUX=.*#SELINUX=disabled#' /etc/selinux/config
systemctl disable firewalld postfix acpid ip6tables mcelogd mdmonitor rpcbind rpcgssd &> /dev/null
systemctl disable rpcidmapd auditd haldaemon lldpad atd kdump netfs nfslock openct &> /dev/null
systemctl enable sshd crond &> /dev/null
}
install_package() {
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.back
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo &> /dev/null
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo &> /dev/null
echo -e "\033[31m正在安装常用软件包\033[0m"
yum -y install vim lsof zip strace openssl openssl-devel gcc gcc-c++ cmake bind-utils libxml2-devel net-tools sysstat &> /dev/null
yum -y install ntpdate curl telnet lbzip2 bzip2 bzip2-devel pcre pcre-devel zlib-devel python-devel lrzsz man &> /dev/null
}
install_zabbix_agent() {
[ ${ZABBIX_AGENT} != 'yes' ] && return 0
echo -e "\033[31m正在安装zabbix-agent\033[0m"
cd /tmp/
ZAB_DOWNLOAD=${ZABBIX_DOWNLOAD}
ZAB_VERSION=${ZABBIX_VERSION}
VERSION=$(echo "${ZAB_VERSION}"|cut -c-3)
wget ${ZAB_DOWNLOAD}${VERSION}/rhel/7/x86_64/zabbix-agent-${ZAB_VERSION}-1.el7.x86_64.rpm &> /dev/null
yum -y localinstall zabbix-agent-${ZAB_VERSION}-1.el7.x86_64.rpm &> /dev/null
rm -f zabbix-agent-${ZAB_VERSION}-1.el7.x86_64.rpm
sed -i "s#^Server=.*#Server=${ZABBIX_SERVER}#" /etc/zabbix/zabbix_agentd.conf
sed -i "s#^ServerActive=.*#ServerActive=${ZABBIX_SERVER}#" /etc/zabbix/zabbix_agentd.conf
systemctl enable zabbix-agent &> /dev/null
systemctl start zabbix-agent &> /dev/null || echo -e "\033[31m安装zabbix-agent失败\033[0m"
}
init_system() {
hostnamectl set-hostname ${HOSTNAME}
timedatectl set-timezone Asia/Shanghai
echo "* * * * * /usr/sbin/ntpdate ${NTPSERVER}" > /var/spool/cron/root
echo "nameserver ${DNS1}" > /etc/resolv.conf
echo "nameserver ${DNS2}" >> /etc/resolv.conf
echo "nameserver ${DNS3}" >> /etc/resolv.conf
chattr +i /etc/resolv.conf
echo 'LANG="en_US.UTF-8"' > /etc/locale.conf
echo 'export LANG="en_US.UTF-8"' >> /etc/profile.d/custom.sh
}
set_kernel_parameter() {
cat > /etc/sysctl.conf << EOF
fs.file-max = 999999
kernel.sysrq = 0
kernel.core_uses_pid = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.ip_forward = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_tw_buckets = 6000
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_wmem = 4096 16384 4194304
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 30
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.all.secure_redirects = 0
net.ipv4.conf.default.secure_redirects = 0
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.netdev_max_backlog = 262144
EOF
}
set_system_limit() {
cat >> /etc/security/limits.conf <<EOF
* soft nproc 8192
* hard nproc 8192
* soft nofile 8192
* hard nofile 8192
EOF
}
set_history() {
cat >> /etc/profile.d/custom.sh <<EOF
USER_IP=$(who -u am i 2>/dev/null| awk '{print $NF}'|sed -e 's/[()]//g')
[ -z ${USER_IP} ] && USER_IP=${hostname}
export HISTTIMEFORMAT="%F %T ${USER_IP} "
shopt -s histappend
export PROMPT_COMMAND="history -a; history -c; history -r; ${PROMPT_COMMAND}"
EOF
}
# 如果升级失败造成的影响较大, 建议管理员手动升级
# update_openssh() {
# [ ${UPDATE_OPENSSH} == 'no' ] && return
# cd /tmp/
# yum -y install cmake gcc zlib-devel openssl-devel pam-devel wget
# cp /etc/ssh/sshd_config /etc/ssh/sshd_config.back
# wget https://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-7.5p1.tar.gz
# tar xf openssh-7.5p1.tar.gz && cd openssh-7.5p1
# ./configure --prefix=/usr --sysconfdir=/etc/ssh --with-md5-passwords --with-pam \
# --with-zlib --with-openssl-includes=/usr --with-privsep-path=/var/lib/sshd
# [ ${?} -ne 0 ] && echo "升级 openssh 失败" >> system_init.log && return
# make || echo "升级 openssh 失败" >> system_init.log && return
# make install || echo "升级 openssh 失败" >> system_init.log
# cp /etc/ssh/sshd_config /etc/ssh/sshd_config.back2
# echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config
# echo "PermitRootLogin yes" >> /etc/ssh/sshd_config
# sed -i 's#GSSAPIAuthentication.*##' /etc/ssh/sshd_config
# sed -i 's#GSSAPICleanupCredentials.*##' /etc/ssh/sshd_config
# }
set_openssh() {
echo "Port ${SSH_PORT}" >> /etc/ssh/sshd_config
[ ${SSH_DNS} != 'yes' ] && echo "UseDNS no" >> /etc/ssh/sshd_config
[ ${SSH_ROOT_LOGIN} == 'no' ] && sed -i 's/^#PermitRootLogin.*/PermitRootLogin no/' /etc/ssh/sshd_config
}
set_nic() {
grub_cinfig='GRUB_CMDLINE_LINUX="crashkernel=auto ipv6.disable=1 net.ifnames=0 rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"'
sed -i "s#GRUB_CMDLINE_LINUX.*#${grub_cinfig}#" /etc/default/grub
grub2-mkconfig -o /boot/grub2/grub.cfg &> /dev/null || echo -e "\033[31m修改grub失败\033[0m"
}
set_service
install_package
install_zabbix_agent
init_system
set_kernel_parameter
set_system_limit
set_history
set_openssh
set_nic
echo -e "\033[32m${0} 执行完毕, 请确认无误之后执行 reboot 重启系统\033[0m"
原文地址：https://www.cnblogs.com/huyuanblog/p/9993907.html
