Linux/Unix shell内嵌expect自动配置多台主机SSH互信

在自动化测试，或者Oracle RAC安装过程中，需要配置主机之间SSH 无密码访问，当有多台主机时，配置起来很麻烦，网上的很多类似脚本拿到本机有问题，所以自己写了一个：
   

1. #!/bin/bash
   
2. 
   
3. NUM_OF_NODES=
   
4. NODE1=""
   
5. NODE2=""
   
6. NODE3=""
   
7. NODE4=""
   
8. NODE5=""
   
9. 
   
10. USER=root
    
11. EXPECT=/usr/bin/expect
    
12. PASSWD=""
    
13. #USER_PROMPT="*$ "
    
14. USER_PROMPT="*# "
    
15. 
    
16. if [ "x${NODE1}" == "x" -o "x${USER}" == "x" -o "x${PASSWD}" == "x" ]; then
    
17.     echo ""
    
18.     echo "Please set the NODE INFO, USER and PASSWD"
    
19.     echo "then $0 to start..."
    
20.     exit 1
    
21. fi
    
22. 
    
23. declare -i l_i=1
    
24. while [ $l_i -le $NUM_OF_NODES ]
    
25. do
    
26.     eval l_current_node=\$NODE$l_i
    
27.     
    
28.     $EXPECT <<EOF
    
29.     spawn ssh $USER@$l_current_node
    
30.     expect "*(yes/no)?*" {
    
31.         send -- "yes\r"
    
32.         expect "*?assword:*"
    
33.         send -- "$PASSWD\r"
    
34.     } "*?assword:*" {send -- "$PASSWD\r"}
    
35.     expect "$USER_PROMPT"
    
36.     send -- "ssh-keygen -t rsa -q -f ~/.ssh/id_rsa -P '' \r"
    
37.     expect "*Overwrite (yes/no)? " {
    
38.         send -- "yes\r"
    
39.     } "$USER_PROMPT" {send -- "\r"}
    
40.     expect "$USER_PROMPT"
    
41.     send -- "cat ~/.ssh/id_rsa.pub | ssh $USER@$NODE1 'cat - >> ~/.ssh/authorized_keys' \r"
    
42.     expect "*(yes/no)?*" {
    
43.         send -- "yes\r"
    
44.         expect "*?assword:*"
    
45.         send -- "$PASSWD\r"
    
46.     } "*?assword:*" {send -- "$PASSWD\r"}
    
47.     expect "$USER_PROMPT"
    
48.     send -- "exit\r"
    
49. EOF
    
50.     ((l_i++))
    
51. done
    
52. 
    
53. declare -i l_n=1
    
54. while [ $l_n -le $NUM_OF_NODES ]
    
55. do
    
56.     eval l_current_node=\$NODE$l_n
    
57.     $EXPECT <<EOF
    
58. 
    
59.     spawn ssh $USER@$NODE1
    
60.     expect "*?assword:*" {
    
61.         send -- "$PASSWD\r"
    
62.         expect "$USER_PROMPT"
    
63.     } "$USER_PROMPT" {send -- "scp ~/.ssh/authorized_keys $l_current_node:~/.ssh/ \r"}
    
64.     expect "*?assword:*"
    
65.     send -- "$PASSWD\r"
    
66.     expect "$USER_PROMPT"
    
67.     send -- "exit\r"
    
68. EOF
    
69.     ((l_n++))
    
70. done