linux虚拟机初始配置

1- CentOS7配置静态IP地址:

iface="网络接口名"
cd /etc/sysconfig/network-scripts/; sed -i 's/^/#/' ifcfg-${iface}
cat <<EOF >>/etc/sysconfig/network-scripts/ifcfg-${iface}
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
NAME=${iface}
DEVICE=${iface}
ONBOOT=yes
IPADDR=192.168.122.11
PREFIX=24
GATEWAY=192.168.122.1
DNS1=223.5.5.5
DNS2=192.168.122.1
DNS3=8.8.8.8
EOF
systemctl restart network #可以先不重启网络,先配置完下面的ssh再重启

2- 解决ssh速度很慢的问题:

sed -ri 's/^(GSSAPIAuthentication).*/\1 no/; $aUseDNS no' /etc/ssh/sshd_config; systemctl restart sshd  #GSSAPI认证关闭,DNS关闭

3- CentOS7使用阿里源:  

sed -ri 's/^enabled=1/enabled=0/; s/^plugins=1/plugins=0/'  /etc/yum/pluginconf.d/fastestmirror.conf /etc/yum.conf  #去掉寻找最快源的功能Determining fastest mirrors
cd /etc/yum.repos.d/; mv CentOS-Base.repo CentOS-Base.repo.bak; curl -Lo CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo && {  yum clean all; yum makecache; } #替换成阿里源

4- CentOS7关闭防火墙/SELINUX

systemctl stop firewalld; systemctl disable firewalld ; setenforce 0;sed -ri 's/^(SELINUX).*/\1=disabled/' /etc/selinux/config