ubuntu开启SSH服务远程登录操作

1、查看openssh-client和openssh-server

ubuntu默认只安装了openssh-client

dpkg -l | grep ssh

ii  libssh-4:amd64                             0.6.3-4.3                                    amd64        tiny C SSH library (OpenSSL flavor)
ii  openssh-client                             1:7.2p2-4ubuntu2.4                           amd64        secure shell (SSH) client, for secure access to remote machines

2、安装openssh-server

sudo apt-get install openssh-server

[sudo] password for tcrush: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
 ncurses-term openssh-client openssh-sftp-server ssh-import-id
Suggested packages:
 ssh-askpass libpam-ssh keychain monkeysphere rssh molly-guard
The following NEW packages will be installed:
 ncurses-term openssh-server openssh-sftp-server ssh-import-id
The following packages will be upgraded:
 openssh-client
1 upgraded, 4 newly installed, 0 to remove and 417 not upgraded.
Need to get 1,223 kB of archives.
After this operation, 5,149 kB of additional disk space will be used.
Do you want to continue? [Y/n] y

3、查看是否安装成功

dpkg -l | grep ssh

ii  libssh-4:amd64                             0.6.3-4.3                                    amd64        tiny C SSH library (OpenSSL flavor)
ii  openssh-client                             1:7.2p2-4ubuntu2.8                           amd64        secure shell (SSH) client, for secure access to remote machines
ii  openssh-server                             1:7.2p2-4ubuntu2.8                           amd64        secure shell (SSH) server, for secure access from remote machines
ii  openssh-sftp-server                        1:7.2p2-4ubuntu2.8                           amd64        secure shell (SSH) sftp server module, for SFTP access from remote machines
ii  ssh-import-id                              5.5-0ubuntu1                                 all          securely retrieve an SSH public key and install it locally

4、查看是否启动

ps -e | grep ssh

4361 ?        00:00:00 sshd

有sshd说明ssh-server已经启动。
如果没有

sudo /etc/init.d/ssh start或 sudo service ssh start

配置相关：
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ssh-server配置文件位于/etc/ssh/sshd_config，在这里可以定义SSH的服务端口，默认端口是22，你可以自己定义成其他端口号，如222。（或把配置文件中的”PermitRootLogin without-password”加一个”#”号,把它注释掉，再增加一句”PermitRootLogin yes”）
在这里插入图片描述
然后重启SSH服务：
sudo /etc/init.d/ssh stop
sudo /etc/init.d/ssh start

5、连接

5.1、查看IP地址

ifconfig

ens33     Link encap:Ethernet  HWaddr 00:0c:29:15:87:af  
          inet addr:192.168.170.128  Bcast:192.168.170.255  Mask:255.255.255.0
          inet6 addr: fe80::81d3:92bf:1575:5ca4/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:11486 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4557 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:12488965 (12.4 MB)  TX bytes:442887 (442.8 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:507 errors:0 dropped:0 overruns:0 frame:0
          TX packets:507 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:57234 (57.2 KB)  TX bytes:57234 (57.2 KB)