初始化root密码

• 配置命令：

app@manager:~$ sudo passwd
[sudo] password for app:
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

• 测试命令：

app@manager:~$ su
Password:
root@manager:/home/app# 

开启root远程登录

• 配置命令：

# 修改配置文件
root@manager:/home/app# vi /etc/ssh/sshd_config

# 找到 PermitRootLogin prohibit-password
# 修改为下面的内容
PermitRootLogin yes

# 保存并重启ssh

• 测试命令：

# 更换服务器，使用ssh登录
root@ubuntu:~# ssh 192.168.0.117
The authenticity of host '192.168.0.117 (192.168.0.117)' can't be established.
ECDSA key fingerprint is SHA256:2NtdloRfkAB7IGA4lfyVw3mv4n+8okxSdAKmh+eHohE.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.0.117' (ECDSA) to the list of known hosts.
root@192.168.0.117's password:
Welcome to Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-62-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

230 packages can be updated.
144 updates are security updates.

New release '18.04.1 LTS' available.
Run 'do-release-upgrade' to upgrade to it.


Last login: Thu Jan 31 10:38:58 2019 from 192.168.0.115
root@manager:~#

配置静态ip

• 配置命令：

# 先查看本机网络信息
root@manager:~# ifconfig
ens160    Link encap:Ethernet  HWaddr 00:0c:29:a5:6d:f6
          inet addr:192.168.0.117  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fea5:6df6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:378 errors:0 dropped:0 overruns:0 frame:0
          TX packets:190 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:43702 (43.7 KB)  TX bytes:24447 (24.4 KB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:160 errors:0 dropped:0 overruns:0 frame:0
          TX packets:160 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:11840 (11.8 KB)  TX bytes:11840 (11.8 KB)

# 修改配置文件
root@manager:~# vi /etc/network/interfaces
# 修改为：
auto ens160
iface ens160 inet static
address 192.168.0.40
netmask 255.255.255.0
gateway 192.169.0.1
dns-nameserver 192.168.0.1

# 保存，并重启服务器

root@manager:~# reboot -h now

• 测试命令：

root@manager:~# ifconfig
ens160    Link encap:Ethernet  HWaddr 00:0c:29:a5:6d:f6
          inet addr:192.168.0.40  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fea5:6df6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:196 errors:0 dropped:0 overruns:0 frame:0
          TX packets:65 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:16991 (16.9 KB)  TX bytes:8294 (8.2 KB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:160 errors:0 dropped:0 overruns:0 frame:0
          TX packets:160 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:11840 (11.8 KB)  TX bytes:11840 (11.8 KB)

root@manager:~# ping www.baidu.com
PING www.a.shifen.com (180.97.33.107) 56(84) bytes of data.
64 bytes from 180.97.33.107: icmp_seq=1 ttl=55 time=30.2 ms
64 bytes from 180.97.33.107: icmp_seq=2 ttl=55 time=32.5 ms
64 bytes from 180.97.33.107: icmp_seq=3 ttl=55 time=29.8 ms
^C
--- www.a.shifen.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 29.827/30.876/32.551/1.196 ms