搭建hadoop环境
因为想在windows平台下开发Hadoop，所以安装了一个cygwin。cygwin是一个可以在windows上模拟linux运行环境的软件，使用它的客户端可以方便的在windows上进行Linux平台的操作。下面总结一下中间遇到的问题和解决方法：首先要下载一个cygwin的安装程序，下载安装程序，下载地址为： http://www.cygwin.com/setup.exe 选择必须安装的包,根据实践有如下包必须选择安 装，否则很可能cygwin安装失败！
Net Category下的OpenSSL，OpenSSH;
Base Category下的sed;
Editors Category下的vim,Emacs;
Devel Category下的subversion,binutils,gcc,gcc-mingw,gdb
安装完成之后，就要配置host并且安装sshd服务了，这里要强调一下sshd服务，很多网上的安装教程没有提到如何安装，其实就是在运行ssh-host-config命令之后安装。里面有这个选项，按照如下操作：
必须要以管理员身份运行cygwin，否则会安装失败，然后运行命令ssh-host-config。
$ ssh-host-config*** Info: Generating /etc/ssh_host_keyunknown key type*** Info: Generating /etc/ssh_host_rsa_keyunknown key type*** Info: Generating /etc/ssh_host_dsa_keyunknown key type*** Query: Overwrite existing /etc/ssh_config file? (yes/no) yes*** Info: Creating default /etc/ssh_config file*** Query: Overwrite existing /etc/sshd_config file? (yes/no) yes*** Info: Creating default /etc/sshd_config file*** Info: Privilege separation is set to yes by default since OpenSSH 3.3.*** Info: However, this requires a non-privileged account called 'sshd'.*** Info: For more info on privilege separation read /usr/share/doc/openssME.privsep.*** Query: Should privilege separation be used? (yes/no) no*** Info: Updating /etc/sshd_config filemount: invalid option - 'text,posix=0,noacl'grep: /ssh-host-config.7180/services: No such file or directorygrep: /ssh-host-config.7180/services: No such file or directory/usr/bin/ssh-host-config: line 119: /ssh-host-config.7180/services: No sucor directory*** Warning: Adding ssh to D:umount: /ssh-host-config.7180: Invalid argume*** Warning: The following functions require administrator privileges!*** Query: Do you want to install sshd as a service?*** Query: (Say "no" if it is already installed as a service) (yes/no) yes*** Query: Enter the value of CYGWIN for the daemon: [] ntsec*** Info: On Windows Server 2003, Windows Vista, and above, the*** Info: SYSTEM account cannot setuid to other users -- a capability*** Info: sshd requires. You need to have or to create a privileged*** Info: account. This script will help you do so.*** Info: You appear to be running Windows 2003 Server or later. On 2003*** Info: and later systems, it's not possible to use the LocalSystem*** Info: account for services that can change the user id without an*** Info: explicit password (such as passwordless logins via sshd).*** Info: If you want to enable that functionality, it's required to creat*** Info: a new account with special privileges (unless a similar account*** Info: already exists). This account is then used to run these special*** Info: servers.*** Info: Note that creating a new user requires that the current account*** Info: have Administrator privileges itself.*** Info: No privileged account could be found.*** Info: This script plans to use 'cyg_server'.*** Info: 'cyg_server' will only be used by registered services.*** Query: Do you want to use a different name? (yes/no) no*** Query: Create new privileged user account 'cyg_server'? (yes/no) yes*** Info: Please enter a password for new user cyg_server. Please be sure*** Info: that this password matches the password rules given on your syst*** Info: Entering no password will exit the configuration.*** Query: Please enter the password:*** Query: Reenter:*** Info: User 'cyg_server' has been created with password 'root'.*** Info: If you change the password, please remember also to change the*** Info: password for the installed services which use (or will soon use)*** Info: the 'cyg_server' account.*** Info: Also keep in mind that the user 'cyg_server' needs read permissi*** Info: on all users' relevant files for the services running as 'cyg_se*** Info: In particular, for the sshd server all users' .ssh/authorized_ke*** Info: files must have appropriate permissions to allow public key*** Info: authentication. (Re-)running ssh-user-config for each user will*** Info: these permissions corrently. .*** Info: The sshd service has been installed under the 'cyg_server'*** Info: account. To start the service now, call `net start sshd' or*** Info: `cygrunsrv -S sshd'. Otherwise, it will start automatically*** Info: after the next reboot.*** Info: Host configuration finished. Have fun!
在计算机管理里面启动sshd服务。
运行ssh localhost验证是否ssh安装成功，但是有一个前提条件就是你的localhost用户必须设置了用户名和密码，所以你的PC机需要设置一个密码，否则不可以远程登录。 (收起)
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