遍历命令并以bash执行

时间:2019-07-17 19:55:46

标签: linux bash amazon-web-services

我编写了一个脚本,该脚本将新密钥传输到我的AWS实例。脚本执行没有错误,但是当我检查实例上的〜/ .ssh / authorized_keys文件时,看不到新的SSH密钥。

这是脚本:

aws_instances=(             
                "ssh -i \"priv.pem\" ubuntu@99.99.99.1" #server1
                "ssh -i \"priv.pem\" ubuntu@99.99.99.2" #server2
                "ssh -i \"priv.pem\" ubuntu@99.99.99.3" #server3
              )
IFS=""
for t in ${aws_instances[@]}; do
  cat ~/newKey.pub | eval $t  'cat >> ~/.ssh/authorized_keys && echo "Key copied"'
done

它确实打印出“密钥已复制”

我更改了服务器的IP地址。

如果我只执行以下命令,它将起作用。

cat ~/newKey.pub | ssh -i "priv.pem" ubuntu@99.99.99.1  'cat >> ~/.ssh/authorized_keys && echo "Key copied"'

我的脚本怎么了?

3 个答案:

答案 0 :(得分:4)

eval是代码气味,请避免像害虫一样。

我认为您可以实现类似的功能:

#!/usr/bin/env bash

# See: https://tools.ietf.org/html/rfc5737
# 3.  Documentation Address Blocks
#
#   The blocks 192.0.2.0/24 (TEST-NET-1), 198.51.100.0/24 (TEST-NET-2),
#   and 203.0.113.0/24 (TEST-NET-3) are provided for use in
#   documentation.

# Array contains user-name@host-or-ip:ssh-port (ssh-port is optional, default standard 22)
aws_instances=(
  'ubuntu@192.0.2.1'
  'ubuntu@192.0.2.2:2222'
  'ubuntu@192.0.2.3:2022'
)

new_keyfile="${HOME}/newKey.pub"

for instance in "${aws_instances[@]}"; do
  ssh_host="${instance%%:*}" # trim the port if specified
  port="${instance##*:}" # trim the host and keep port if specified
  [[ ${port} == "${instance}" || -z "${port}" ]] && port=22 # use default port

  if ssh-copy-id \
    -i "${new_keyfile}" \
    -p "${port}"
    "${ssh_host}"; then
    printf \
      $"The new key file '%s' has been copied to user@host: '%s', port: %d.\\n" \
      "${new_keyfile}" \
      "${instance}" \
      "${port}"
  else
    printf >&2 \
      $"Could not copy the new key file '%s' to user@host: '%s', port: %d.\\n" \
      "${new_keyfile}" \
      "${instance}" \
      "${port}"
  fi
done

答案 1 :(得分:3)

您需要在第二个eval参数周围加上引号。

例如:

cat ~/newKey.pub | eval $t  "'"'cat >> ~/.ssh/authorized_keys && echo "Key copied"'"'"

问题在于,第一次调用eval时单引号会丢失,因此它将尝试执行的命令为

ssh -i "priv.pem" ubuntu@99.99.99.1 cat >> ~/.ssh/authorized_keys && echo "Key copied"

只是将ssh命令的输出附加到您的 local authorized_keys文件中,而不是将密钥添加到远程主机中。

答案 2 :(得分:1)

有时候越简单越好。也许这样可以消除评估?

for i in 1 2 3
do  ssh -i priv.pem ubuntu@99.99.99.$i 'cat >> ~/.ssh/authorized_keys &&
      echo "Key copied" '< ~/newKey.pub
done

(在会议中,无法测试-警告脚本。)