① 如何自动输入密码ssh连接到其他机器
主要的解决方法有三种：
1. 生成ssh公钥，建立和对方机器的信任关系；
2. 使用expect脚本；
3. 使用sshpass。
这里介绍一下sshpass相关内容
下载并安装sshpass）：
# tar zxvf sshpass-xxxx.tar.gz
# cd sshpass-xxxx
# ./configure
# make && make install
基本用法：sshpass -p [密码] ssh [user]@[host]
免去第一次登录机器时的确认提示（Are you sure you want to continue connecting (yes/no)）：
sshpass -p [密码] ssh [user]@[host] -o StrictHostKeyChecking=no
后面也可以跟上其他ssh命令，如scp等
例1，公司的一个环境，大部分机器的login密码是"1root",少部分是"123qwe",新建一个hssh.sh文件，按如下修改，到/usr/bin/目录下。
[cpp] view plain
#!/bin/sh
#_main_
temp_file=/tmp/hssh.1
ip=192.168.$1
case "$1" in
"204.188"|"207.31"|"205.199") password="123qwe";;
*) password="1root"
esac
sshpass -p $password ssh root@$ip -o StrictHostKeyChecking=no 2>$temp_file
if [ $? != 0 ];then
#for some reason,machine had reinstall, we need to delete that IP address in known_hosts file before ssh it.
grep -q "REMOTE HOST IDENTIFICATION HAS CHANGED" $temp_file
if [ $? = 0 ];then
key_file=`grep "Offending key in" $temp_file | cut -d' ' -f 4 | cut -d ':' -f1 2>/dev/null`
cat $key_file | grep -v "$ip" > $temp_file
sudo cp -v $temp_file $key_file
sshpass -p $password ssh root@$ip -o StrictHostKeyChecking=no 2>$temp_file
fi
fi
那么我们每次只要输入hssh XXX.XXX 等就可以ssh到对应机器上了
② linux下怎样设置ssh无密码登录
有两种方法，可以用证书实现无密码登录，或者sshpass命令可以指定ssh登陆密码。
1、派出间谍
Step 1:执行ssh-keygen -t rsa，会在~/.ssh下生成两个文件，id_isa和id_isa.pub
On one of the local LINUX (not SGI) machines, generate an id_rsa and id_rsa.pub pair as follows (this machine will subsequently be referred to as your home machine):
ssh-keygen will create the files ~/.ssh/id_rsa and ~/.ssh/id_rsa.pub.
Step 2: Copy the contents of ~/.ssh/id_rsa.pub to ~/.ssh/authorized_keys on any and all machines to which you want to be able to ssh to without being prompted for a password
可以用下面的命令完成此步骤：
cat id_rsa.pub |ssh [email protected] ‘cat ->> ~/.ssh/authorized_keys’
2、用sshpass程序
安装：
tar zxf sshpass-1.05.tar.gz
cd sshpass-1.05
./configure;make;make install
which sshpass
/usr/local/bin/sshpass
实例：
sshpass -p “passwd” ssh root@ip