1,基于有密码及免秘钥在远程主机上执行命令及脚本
ssh -T ip "CLI or shell.sh";
2,C程序实现上述功能--基于password-less
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alt="" />
将上面简单C程序打包移植到别的系统下使用测试
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authorized_keys;
将本身的~/.ssh/id_rsa.pub 复制到需要passwordLess 的主机并将id_rsa.pub内容追加到~/.ssh/authorized_keys里面,便可passwordless登陆.
3,复制ssh秘钥到目标主机
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4,从某主机80端口开启到本地主机2001端口隧道
ssh -N -L2001:localhost:80 somemachine;
http://localhost:2001访问网站
5,比较本地远程文件是否有差异跳板机
6,ssh堡垒
ssh -t reachable_host ssh unreachable_host
ssh命令
OpenSSH是SSH连接工具的免费版本。telnet，rlogin和ftp用户可能还没意识到他们在互联网上传输的密码是未加密的，但SSH是加密的，OpenSSH加密所有通信（包括密码），有效消除了窃听，连接劫持和其它攻击。此外，OpenSSH提供了安全隧道功能和多种身份验证方法，支持SSH协议的所有版本。 SSH是一个非常伟大的工具，如果你要在互联网上远程连接到服务器，那么SSH无疑是最佳的候选。下面是通过网络投票选出的25个最佳SSH命令，你必须牢记于心。 （注：有些内容较长的命令，在本文中会显示为截断的状态。如果你需要阅读完整的命令，可以把整行复制到您的记事本当中阅读。） 、复制SSH密钥到目标主机，开启无密码SSH登录 ssh-copy-id user@host 如果还没有密钥，请使用ssh-keygen命令生成。 、从某主机的80端口开启到本地主机2001端口的隧道 ssh -N -L2001:localhost: somemachine 现在你可以直接在浏览器中输入http://localhost:2001访问这个网站。 、将你的麦克风输出到远程计算机的扬声器 dd if=/dev/dsp | ssh -c arcfour -C username@host dd of=/dev/dsp 这样来自你麦克风端口的声音将在SSH目标计算机的扬声器端口输出，但遗憾的是，声音质量很差，你会听到很多嘶嘶声。 、比较远程和本地文件 ssh user@host cat /path/to/remotefile | diff /path/to/localfile – 在比较本地文件和远程文件是否有差异时这个命令很管用。 、通过SSH挂载目录/文件系统 sshfs name@server:/path/to/folder /path/to/mount/point 从http://fuse.sourceforge.net/sshfs.html下载sshfs，它允许你跨网络安全挂载一个目录。 、通过中间主机建立SSH连接 ssh -t reachable_host ssh unreachable_host Unreachable_host表示从本地网络无法直接访问的主机，但可以从reachable_host所在网络访问，这个命令通过到reachable_host的“隐藏”连接，创建起到unreachable_host的连接。 、将你的SSH公钥复制到远程主机，开启无密码登录 – 简单的方法 ssh-copy-id username@hostname 、直接连接到只能通过主机B连接的主机A ssh -t hostA ssh hostB 当然，你要能访问主机A才行。 、创建到目标主机的持久化连接 ssh -MNf <user>@<host> 在后台创建到目标主机的持久化连接，将这个命令和你~/.ssh/config中的配置结合使用： Host host
ControlPath ~/.ssh/master-%r@%h:%p
ControlMaster no 所有到目标主机的SSH连接都将使用持久化SSH套接字，如果你使用SSH定期同步文件（使用rsync/sftp/cvs/svn），这个命令将非常有用，因为每次打开一个SSH连接时不会创建新的套接字。 、通过SSH连接屏幕 ssh -t remote_host screen –r 直接连接到远程屏幕会话（节省了无用的父bash进程）。 、端口检测（敲门） knock <host> && ssh -p <port> user@host && knock <host> 在一个端口上敲一下打开某个服务的端口（如SSH），再敲一下关闭该端口，需要先安装knockd，下面是一个配置文件示例。 [options]
logfile = /var/log/knockd.log
[openSSH]
sequence = ,,
seq_timeout =
command = /sbin/iptables -A INPUT -i eth0 -s %IP% -p tcp –dport -j ACCEPT
tcpflags = syn
[closeSSH]
sequence = ,,
seq_timeout =
command = /sbin/iptables -D INPUT -i eth0 -s %IP% -p tcp –dport -j ACCEPT
tcpflags = syn 、删除文本文件中的一行内容，有用的修复 ssh-keygen -R <the_offending_host> 在这种情况下，最好使用专业的工具。 、通过SSH运行复杂的远程shell命令 ssh host -l user $(<cmd.txt) 更具移植性的版本： ssh host -l user “`cat cmd.txt`” 、通过SSH将MySQL数据库复制到新服务器 mysqldump –add-drop-table –extended-insert –force –log-error=error.log -uUSER -pPASS OLD_DB_NAME | ssh -C user@newhost “mysql -uUSER -pPASS NEW_DB_NAME” 通过压缩的SSH隧道Dump一个MySQL数据库，将其作为输入传递给mysql命令，我认为这是迁移数据库到新服务器最快最好的方法。 、删除文本文件中的一行，修复“SSH主机密钥更改”的警告 sed -i 8d ~/.ssh/known_hosts 、从一台没有SSH-COPY-ID命令的主机将你的SSH公钥复制到服务器 cat ~/.ssh/id_rsa.pub | ssh user@machine “mkdir ~/.ssh; cat >> ~/.ssh/authorized_keys” 如果你使用Mac OS X或其它没有ssh-copy-id命令的*nix变种，这个命令可以将你的公钥复制到远程主机，因此你照样可以实现无密码SSH登录。 、实时SSH网络吞吐量测试 yes | pv | ssh $host “cat > /dev/null” 通过SSH连接到主机，显示实时的传输速度，将所有传输数据指向/dev/null，需要先安装pv。 如果是Debian： apt-get install pv 如果是Fedora： yum install pv （可能需要启用额外的软件仓库）。 、如果建立一个可以重新连接的远程GNU screen ssh -t user@some.domain.com /usr/bin/screen –xRR 人们总是喜欢在一个文本终端中打开许多shell，如果会话突然中断，或你按下了“Ctrl-a d”，远程主机上的shell不会受到丝毫影响，你可以重新连接，其它有用的screen命令有“Ctrl-a c”（打开新的shell）和“Ctrl-a a”（在shell之间来回切换），请访问http://aperiodic.net/screen/quick_reference阅读更多关于screen命令的快速参考。 、继续SCP大文件 rsync –partial –progress –rsh=ssh $file_source $user@$host:$destination_file 它可以恢复失败的rsync命令，当你通过VPN传输大文件，如备份的数据库时这个命令非常有用，需要在两边的主机上安装rsync。 rsync –partial –progress –rsh=ssh $file_source $user@$host:$destination_file local -> remote 或 rsync –partial –progress –rsh=ssh $user@$host:$remote_file $destination_file remote -> local 、通过SSH W/ WIRESHARK分析流量 ssh root@server.com ‘tshark -f “port !″ -w -' | wireshark -k -i – 使用tshark捕捉远程主机上的网络通信，通过SSH连接发送原始pcap数据，并在wireshark中显示，按下Ctrl+C将停止捕捉，但也会关闭wireshark窗口，可以传递一个“-c #”参数给tshark，让它只捕捉“#”指定的数据包类型，或通过命名管道重定向数据，而不是直接通过SSH传输给wireshark，我建议你过滤数据包，以节约带宽，tshark可以使用tcpdump替代： ssh root@example.com tcpdump -w – ‘port !′ | wireshark -k -i – 、保持SSH会话永久打开 autossh -M50000 -t server.example.com ‘screen -raAd mysession’ 打开一个SSH会话后，让其保持永久打开，对于使用笔记本电脑的用户，如果需要在Wi-Fi热点之间切换，可以保证切换后不会丢失连接。 、更稳定，更快，更强的SSH客户端 ssh - -C -c blowfish-cbc 强制使用IPv4，压缩数据流，使用Blowfish加密。