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。