需求：每5分钟查询获取DM7000H存储172.20.52.30、172.20.52.40卷性能数据，并保存到文件中，每天保存一个文件。
#####优化前脚本内容#####
cat get_storage_stats.sh
#!/usr/bin/expect
set LOG_FILE “/app/log_storage/[exec date +%Y%m%d]_storage_stats.log”
log_file -a $LOG_FILE
spawn ssh admin@172.20.52.30
expect “Password:”
send “V0iCe#Len0325\r”
expect “*>”
send “statistics volume show -sort-key instance_name -iterations 1\r”
expect “*>”
send “exit\r”
spawn ssh admin@172.20.52.40
expect “Password:”
send “V0iCe#Len0425\r”
expect “*>”
send “statistics volume show -sort-key instance_name -iterations 1\r”
expect “*>”
send “exit\r”
log_file
system “chmod 644 $LOG_FILE”
#####优化后脚本内容（密码单独存放）#####
1. 创建密码文件
创建一个仅 root 或当前用户可读的文件（例如 /app/.storage_pwd）：
# 文件格式：IP 密码
172.20.52.30 V0iCe#Len0325
172.20.52.40 V0iCe#Len0425
设置严格权限：chmod 600 /app/.storage_pwd
2. 优化后的脚本(通过读取外部文件获取密码)
#!/usr/bin/expect
# 读取密码文件的辅助过程
proc get_password {ip} {
set fh [open “/app/.storage_pwd” r]
while {[gets $fh line] >= 0} {
# 假设文件每行格式为 “IP Password”
if {[string match “$ip *” $line]} {
close $fh
# 返回 IP 后面的部分作为密码
return [lindex $line 1]
}
}
close $fh
return “”
}
set LOG_FILE “/app/log_storage/[exec date +%Y%m%d]_storage_stats.log”
log_file -a $LOG_FILE
# — 节点 1 —
set target_ip “172.20.52.30”
set pwd [get_password $target_ip]
spawn ssh admin@$target_ip
expect “Password:”
send “$pwd\r”
expect “*>”
send “statistics volume show -sort-key instance_name -iterations 1\r”
expect “*>”
send “exit\r”
# — 节点 2 —
set target_ip “172.20.52.40”
set pwd [get_password $target_ip]
spawn ssh admin@$target_ip
expect “Password:”
send “$pwd\r”
expect “*>”
send “statistics volume show -sort-key instance_name -iterations 1\r”
expect “*>”
send “exit\r”
log_file
system “chmod 644 $LOG_FILE”