http://isoredirect.centos.org/centos/7/isos/x86_64/CentOS-7.0-1406-x86_64-DVD.iso
使用 CentOS-7.0-1406-x86_64-DVD.iso 最小安裝，無圖型介面。
參考：
http://shaurong.blogspot.tw/2014/07/centos-linux-701406.html
重要變更
kernel 更新至 3.10.0
支持 Linux 容器
Open VMware Tools 及 3D 圖像能即裝即用
OpenJDK-7 作為預設 JDK
原地升級 6.5 至 7.0
ext4 及 XFS 的 LVM 快照
**轉用 systemd、firewalld 及 GRUB2
**XFS 作為預設檔案系統
內核空間內的 iSCSI 及 FCoE
支持 PTPv2
支援 40G 乙太網路卡
版本查詢：
# cat /etc/centos-release
CentOS Linux release 7.1.1503 (Core)
# uname -a
Linux centos7.jwin.com 3.10.0-229.7.2.el7.x86_64 #1 SMP Tue Jun 23 22:06:11 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
# getconf LONG_BIT
64
已知問題
#預設的 NetworkManager 工具不會啟用乙太網路介面，安裝時必須以人手啟用。
使用指令：
#nmtui 文字圖形介面，網路設定。
#nmcli 命令模式，網路設定。
#nmcli device status
http://dywang.csie.cyut.edu.tw/moodle23/dywang/rhel7/node19.html
#最小安裝，沒有ifconfig指令(待退集)，需用ip addr 及 ip link 查詢
補充ifconfig 指令集：
# yum install net-tools
2.更改網卡名稱及設定固IP
參考：http://blog.ilc.edu.tw/blog/blog/25793/post/78462/511822
參考：http://wiki.centos.org/zh-tw/FAQ/CentOS7
CentOS 7 的網路卡代號捨棄了原本熟悉的 ethx
# ls -l /etc/sysconfig/network-scripts/ifcfg-*
網路卡設定
# cat /etc/sysconfig/network-scripts/ifcfg-eno16777736
修改 /etc/default/grub
在 GRUB_CMDLINE_LINUX 後加上 net.ifnames=0 biosdevname=0
# vim /etc/default/grub
產生新的 grub 設定檔
# grub2-mkconfig -o /boot/grub2/grub.cfg
直接把 ifcfg-enoxxx 改成 ifcfg-eth0
# mv /etc/sysconfig/network-scripts/ifcfg-eno16777736 /etc/sysconfig/network-scripts/ifcfg-eth0
修改網路卡代號
# sed -i 's/eno16777736/eth0/g' /etc/sysconfig/network-scripts/ifcfg-eth0
重新開機
# sync;sync;sync;sync;reboot
網路卡代號已更改
# ifconfig eth0
3. 啟用網卡,
# cd /etc/sysconfig/network-scripts
# vi ifcfg-eth0 (名稱因設備不同而異)
ONBOOT=yes
4.修改hostname
#cat /etc/hostname
#vi /etc/hostname
5. 修改本機hosts
#vi /etc/hosts
6. dns 設定表
#cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 8.8.8.8
7.NetworkManager 指令用法：
#nmuti
文字圖型介面設定
#nmcli
命令指行
#nmcli device show
8.若是要停用 NetworkManager
# systemctl stop NetworkManager
# systemctl disable NetworkManager
# systemctl restart network
9. systemctl 指令對照表：
10.固定ip設定值參考：
NAME="eth0"
HWADDR="8C:89:A5:52:E9:1C"
TYPE="Ethernet"
ONBOOT="yes"
NM_CONTROLLED="no"
BOOTPROTO="static"
#
IPADDR=192.168.1.10
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
#
# the GATEWAY is sometimes in: /etc/sysconfig/network
#
Services
| Sysvinit Command | Systemd Command | Notes |
|---|---|---|
| service frobozz start | systemctl start frobozz.service | Used to start a service (not reboot persistent) |
| service frobozz stop | systemctl stop frobozz.service | Used to stop a service (not reboot persistent) |
| service frobozz restart | systemctl restart frobozz.service | Used to stop and then start a service |
| service frobozz reload | systemctl reload frobozz.service | When supported, reloads the config file without interrupting pending operations. |
| service frobozz condrestart | systemctl condrestart frobozz.service | Restarts if the service is already running. |
| service frobozz status | systemctl status frobozz.service | Tells whether a service is currently running. |
| ls /etc/rc.d/init.d/ | systemctl list-unit-files --type=service (preferred) ls /lib/systemd/system/*.service /etc/systemd/system/*.service | Used to list the services that can be started or stopped Used to list all the services and other units |
| chkconfig frobozz on | systemctl enable frobozz.service | Turn the service on, for start at next boot, or other trigger. |
| chkconfig frobozz off | systemctl disable frobozz.service | Turn the service off for the next reboot, or any other trigger. |
| chkconfig frobozz | systemctl is-enabled frobozz.service | Used to check whether a service is configured to start or not in the current environment. |
| chkconfig --list | systemctl list-unit-files --type=service(preferred) ls /etc/systemd/system/*.wants/ | Print a table of services that lists which runlevels each is configured on or off |
| chkconfig frobozz --list | ls /etc/systemd/system/*.wants/frobozz.service | Used to list what levels this service is configured on or off |
| chkconfig frobozz --add | systemctl daemon-reload | Used when you create a new service file or modify any configuration |
Note that all /sbin/service and /sbin/chkconfig lines listed above continue to work on systemd, and will be translated to native equivalents as necessary. The only exception is chkconfig --list.
