1：安裝JDK

下載好jdk-7u45-linux-x64.gz

或從其它電腦copy過去

[jifeng@feng01 ~]$scp -r ./jdk-7u45-linux-x64.gz jifeng@jifeng01:/home/jifeng The authenticity of host 'jifeng01 (10.3.7.214)' can't be established. RSA key fingerprint is a8:9d:34:63:fa:c2:47:4f:81:10:94:fa:4b:ba:08:55. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'jifeng01,10.3.7.214' (RSA) to the list of known hosts. jifeng@jifeng01's password: jdk-7u45-linux-x64.gz 100% 132MB 32.9MB/s 00:04
2:解壓并配置java 環境

解壓:tar vzxf jdk-7u45-linux-x64.gz

然后在/home/jifeng/.bash_profile文件末加上以下語句：

export JAVA_HOME=$HOME/jdk1.7.0_45

export PATH=$JAVA_HOME/bin:$PATH

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

接著使文件生效：source /home/jifeng/.bash_profile

最后，驗證是否安裝成功：

java -version

[jifeng@jifeng01 ~]$ source /home/jifeng/.bash_profile [jifeng@jifeng01 ~]$ java -version java version "1.7.0_45" Java(TM) SE Runtime Environment (build 1.7.0_45-b18) Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode) [jifeng@jifeng01 ~]$
3:ssh免登陸

[jifeng@jifeng01 ~]$ ssh-keygen -t -rsa unknown key type -rsa [jifeng@jifeng01 ~]$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/jifeng/.ssh/id_rsa): /home/jifeng/.ssh/id_rsa already exists. 存在文件要覆蓋 Overwrite (y/n)? y Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/jifeng/.ssh/id_rsa. Your public key has been saved in /home/jifeng/.ssh/id_rsa.pub. The key fingerprint is: b0:f3:f7:6f:80:98:09:48:52:03:2e:a5:d3:e6:b1:a8 jifeng@jifeng01查看生成的文件
[jifeng@jifeng01 ~]$ cd .ssh [jifeng@jifeng01 .ssh]$ ls authorized_keys id_rsa id_rsa.pub [jifeng@jifeng01 .ssh]$ ls -l 總計 12 -rw-r--r-- 1 jifeng jifeng 397 07-22 15:40 authorized_keys -rw------- 1 jifeng jifeng 1675 07-23 22:56 id_rsa -rw-r--r-- 1 jifeng jifeng 397 07-23 22:56 id_rsa.pub另外一臺電腦也這樣操作
[jifeng@jifeng02 ~]$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/jifeng/.ssh/id_rsa): /home/jifeng/.ssh/id_rsa already exists. Overwrite (y/n)? y Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/jifeng/.ssh/id_rsa. Your public key has been saved in /home/jifeng/.ssh/id_rsa.pub. The key fingerprint is: 74:bb:ff:af:9d:f3:4e:2e:18:6b:91:45:ff:ac:37:85 jifeng@jifeng02 The key's randomart image is: +--[ RSA 2048]----+ | | | . | | . . . . | | . . . . .| | S . o o.| | .+ E +| | . = .o| | .+ o*o| | ...oBX| +-----------------+復制文件到jifeng02

[jifeng@jifeng01 .ssh]$ scp ./id_rsa.pub jifeng@jifeng02:/home/jifeng/.ssh/authorized_keys The authenticity of host 'jifeng02 (10.3.7.212)' can't be established. RSA key fingerprint is 5f:20:1a:77:96:99:4a:f2:5d:a1:1d:68:b6:91:5a:e7. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'jifeng02,10.3.7.212' (RSA) to the list of known hosts. jifeng@jifeng02's password: id_rsa.pub 100% 397 0.4KB/s 00:00 [jifeng@jifeng01 .ssh]$ 測試成功

[jifeng@jifeng01 .ssh]$ ssh jifeng02 Last login: Wed Jul 23 22:22:27 2014 from 10.254.254.8 [jifeng@jifeng02 ~]$

總結

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