开启网络连接
centos7 mini版本默认是无网络连接的。我们可以查看本地ip信息：
[root@localhost ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eno16777728: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:ad:96:16 brd ff:ff:ff:ff:ff:ff
[root@localhost ~]#
查看网络配置文件
[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME=eno16777728
UUID=05d5a7d5-f16e-4492-9ea1-fa46b7134a8a
DEVICE=eth0
ONBOOT=no
[root@localhost ~]#
如果要开启DHCP，更新ifcfg-文件的 ONBOOT 值，从 no 改为 yes，保存并重启服务。
[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
结果如下
TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME=eno16777728
UUID=05d5a7d5-f16e-4492-9ea1-fa46b7134a8a
DEVICE=eno16777728
ONBOOT=yes
重启网络服务
[root@localhost ~]# service network restart
Restarting network (via systemctl): [ OK ]
查看ip信息：
[root@localhost ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:ad:96:16 brd ff:ff:ff:ff:ff:ff
inet 172.16.1.136/24 brd 172.16.1.255 scope global dynamic eno16777728
valid_lft 1626sec preferred_lft 1626sec
inet6 fe80::20c:29ff:fead:9616/64 scope link
valid_lft forever preferred_lft forever
如果你是固定ip，需要更新 ifcfg-eth0，添加静态地址IPADDR。
[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eno16777728
TYPE=Ethernet
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME=eno16777728
UUID=05d5a7d5-f16e-4492-9ea1-fa46b7134a8a
DEVICE=eno16777728
ONBOOT=yes
DNS1=172.16.1.21
DOMAIN=2factor.net
IPADDR=172.16.1.25
PREFIX=24
GATEWAY=172.16.1.254
重启网络服务
[root@localhost ~]# service network restart
Restarting network (via systemctl): [ OK ]
参考：https://wiki.centos.org/FAQ/CentOS7#head-a21a9e454157700367c9b7e9ccb1ff9954bec881
开启远程ssh
CentOS7默认已经安装openssh-server，如果没有，执行安装命令如下；
yum install openssh-server -y
编辑ssh配置文件
[root@centos-linux ~]# vim /etc/ssh/sshd_config
开启如下配置：
Port 22
#AddressFamily any
ListenAddress 0.0.0.0
ListenAddress ::
# The default requires explicit activation of protocol 1
Protocol 2
#RSAAuthentication yes
PubkeyAuthentication yes
# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile .ssh/authorized_keys
重启服务即可
systemctl restart sshd.service
关于ssh更多帮助：https://wiki.centos.org/HowTos/Network/SecuringSSH
开启非root用户sudo提升权限的功能
编辑文件/etc/sudoers
首先增加sudoers文件写权限
chmod 777 /etc/sudoers
然后编辑此文件
vi /etc/sudoers
增加相关用户信息
## Allow root to run any commands anywhere
root ALL=(ALL) ALL
devid ALL=(ALL) ALL
devid是我的用户名，保存文件即可。
