26天视频笔记
2) 系统优化过程1. 模板机优化配置---hosts文件配置
\cp /etc/hosts{,.bak}
cat >/etc/hosts<<EOF
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
172.16.1.5 lb01
172.16.1.6 lb02
172.16.1.7 web01
172.16.1.8 web02
172.16.1.9 web03
172.16.1.51 db01
172.16.1.31 nfs01
172.16.1.41 backup
172.16.1.61 m01
EOF
ip 太多 不好记 所以我们用名称访问 方便记忆
2. 模板机优化配置---更改yum源
#更改yum源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup &&\
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum install -y wget
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
PS：yum repolist 列出yum源信息；讲解什么是epel源
3. 模板机优化配置---关闭selinux
#关闭selinux
sed -i.bak 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
grep SELINUX=disabled /etc/selinux/config
setenforce 0
getenforce
4. 模板机优化配置---关闭iptables
#关闭iptablescentos7
systemctl stop firewalld
systemctl disable firewalld
systemctl statusfirewalld
5. 模板机优化配置---提权oldboy可以sudo (可选配置)
#提权oldboy可以sudo(可选配置)
useradd oldboy
echo 123456|passwd --stdin oldboy
\cp /etc/sudoers /etc/sudoers.ori
echo "oldboyALL=(ALL) NOPASSWD: ALL " >>/etc/sudoers
tail -1 /etc/sudoers
visudo -c
6. 模板机优化配置---英文字符集
#英文字符集
localectl set-locale LANG="en_US.UTF-8"
7. 模板机优化配置---时间同步
#时间同步
yum install -y ntpdate
echo '#time sync by lidao at 2017-03-08' >>/var/spool/cron/root
echo '*/5 * * * * /usr/sbin/ntpdate ntp1.aliyun.com >/dev/null 2>&1' >>/var/spool/cron/root
crontab -l
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