问题：
1、最小化安装centos7后发现无ifconfig命令
想通过ifconfig查看ip地址发现ifconfig命令不存在，可通过命令
#ip addr //查看ip
或者
解决：
#yum -y install net-tools
问题：
2、centos7默认将网卡1命名为eno16777736，如何修改回熟悉的eth0
解决：
[root@localhost ~]# cat /etc/default/grub
GRUB_TIMEOUT=
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="vconsole.keymap=us crashkernel=auto vconsole.font=latarcyrheb-sun16 rhgb quiet"
GRUB_DISABLE_RECOVERY="true" [root@localhost ~]#vim /etc/default/grub //或者编辑/etc/sysconfig/grub也一样，因为是/etc/default/grub的软连接
GRUB_TIMEOUT=
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0 vconsole.keymap=us crashkernel=auto vconsole.font=latarcyrheb-sun16 rhgb quiet" #增加net.ifnames=0(不使用新的命名规则) biosdevname=0(针对dell服务器不使用类似em0的命名规则)
GRUB_DISABLE_RECOVERY="true"
[root@localhost ~]# grub2-mkconfig -o /etc/grub2.cfg //或者指定文件/boot/grub2/grub.cfg，/etc/grub2.cfg是/boot/grub2/grub.cfg的软连接
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-123.9.3.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-123.9.3.el7.x86_64.img
Warning: Please don't use old title `CentOS Linux, with Linux 3.10.0-123.9.3.el7.x86_64' for GRUB_DEFAULT, use `Advanced options for CentOS Linux>CentOS Linux, with Linux 3.10.0-123.9.3.el7.x86_64' (for versions before 2.00) or `gnulinux-advanced-eb8b5914-351d-4274-85f7-40c3d3357b45>gnulinux-3.10.0-123.9.3.el7.x86_64-advanced-eb8b5914-351d-4274-85f7-40c3d3357b45' (for 2.00 or later)
Found linux image: /boot/vmlinuz-0-rescue-9623c0e26d1b452f9dc41631215adf1c
Found initrd image: /boot/initramfs-0-rescue-9623c0e26d1b452f9dc41631215adf1c.img
done
#cp /etc/sysconfig/network-scripts/ifcfg-eno16777736 /etc/sysconfig/network-scripts/ifcfg-eth0
#vim /etc/sysconfig/network-scripts/ifcfg-eth0
NAME=eth0 #NAME=eno16777736修改为
重启服务器