背景

一般情况下,我们ssh 配置都是使用 ~/.ssh/config 里面的配置即可。

但是如果我们线上所要维护或者要连接的机器比较多,我们怎么分门别类呢?

大家请看:

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Include
	Include the specified configuration file(s).  Multiple path‐names may be specified and each pathname may contain glob(3) wildcards and, for user configurations, shell-like ‘~’ references to user home directories.  Files without absolute paths are assumed to be in ~/.ssh if included in a user configuration file or /etc/ssh if included from the system configuration file. Include directive may appear inside a Match or Host block to perform conditional inclusion.

注意: Include 必须在 config 配置的 Host 之前的位置,不能夹杂在多个 Host 之间。

涉及到的脚本:

Makefile

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install-ssh-config:
	@./install-ssh-config.sh $(identify_file)

install-ssh-config.sh:

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identify_file=${1:-""}
if [ ! -z $identify_file ]; then
	identify_file="IdentityFile $identify_file"
fi

...
grep -q -F 'Include ~/.ssh/config.d/*' "$HOME/.ssh/config" || cat -n "$HOME/.ssh/config" |grep -i host |awk '{print $1-1}'|sed -n "1"p |xargs -I LINE sed -i '' -e $'LINE i\\\n''Include ~/.ssh/config.d/*' "$HOME/.ssh/config"

分步分析:

  1. Makefile 的参数传递,可以通过带指定参数名来传递给 shell;
  2. shell 通过 $参数位置 读取,更多详解请查阅文档;
  3. grep -q 的命令;
  4. grep -F ;
  5. grep -i 不区分大小写;
  6. awk 获取参数值;
  7. sed -n “1”p 获取到第 1 个值并打印出来;
  8. xargs -I LINE 将结果通过管道带入到下一个语句中,并赋值给 LINE;
  9. sed -i '' -e $'LINE i\\\n''xxx' 在匹配的位置插入 “xxx”

参考资料

  1. What’s wrong with my OpenSSH Include directive?
  2. ssh_config — OpenSSH SSH client configuration files

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