add ssh tip

tools/ssh-tips.md

@@ -7,13 +7,22 @@ B服务器地址：10.8.216.26，下面简称B
 实现A登录B免密码。
 
 ## 1.1. 在A生成密钥对
+
+无密码方式：
+
+```bash
+ssh-keygen -t rsa -P 
+```
+
+自定义密码参数：
+
 ```bash
 ssh-keygen -C <comment> -f <keyfile> -t rsa -P "<passphrase>"
 ```
 
 执行上述命令，一路回车，会在当前登录用户的home目录下的.ssh目录下生成id_rsa和id_rsa.pub两个文件，分别代表密钥对的私钥和公钥，如下图所示：
 
-<img src="https://img-blog.csdn.net/20170916200144505?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvaHV3aF8=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast">
+![](https://img-blog.csdn.net/20170916200144505?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvaHV3aF8=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
 
 ## 1.2. 拷贝A的公钥（id_rsa.pub）到B
 
@@ -31,9 +40,10 @@ scp /root/.ssh/id_rsa.pub [email protected]:/root
 cd /root
 cat id_rsa.pub >> .ssh/authorized_keys
 ```
+
 如图：
 
-<img src="https://img-blog.csdn.net/20170916200919602?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvaHV3aF8=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast">
+![](https://img-blog.csdn.net/20170916200919602?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvaHV3aF8=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
 
 ## 1.4. 登录或拷贝
 
@@ -60,20 +70,41 @@ Host jump
         forwardagent yes
         identityfile ~/.ssh/id_rsa
 Host *.gw
-	    user {username}
-	    port {port}
-	    proxycommand ssh -W $(echo %h | sed -e "s/.gw$//"):%p jump
+        user {username}
+        port {port}
+        proxycommand ssh -W $(echo %h | sed -e "s/.gw$//"):%p jump
 Host bj*
         User    {username}
         Port    {port}
         proxycommand ssh -W 192.168.123.$(echo %h | awk -F 'bj' '{print $2}'):%p jump    
 ```
 
+多层跳板机
+
+```bash
+Host jump1
+        Hostname {jump1_ip}
+        Port  {port}
+        User  {username}
+        forwardagent yes
+        identityfile ~/.ssh/id_rsa
+Host jump2
+        Hostname {jump2_ip}
+        Port {port}
+        User {username}
+        ProxyCommand ssh -q -x -W %h:%p jump1
+Host *
+        Hostname %h
+        Port  {port}
+        User  {username}
+        ProxyCommand ssh -q -x -W %h:%p jump2
+```
+
 ## 2.2. 记录机器文件
 
 将关键字和IP写入文件记录，例如 `~/.my_hosts`。
 
-示例：可以是IP + 环境等关键字
+示例：可以是IP + 环境等关键字，中间用空格隔开。
 
 ```bash
 # release
@@ -101,7 +132,7 @@ brew install fzf
 
 设置 alias 到shell rc 文件(.bashrc / .zshrc) 
 
-```
+```bash
 alias goto="ssh \$(cat ~/.my_hosts | fzf | awk '{ printf(\"%s.gw\", \$1)}')"
 ```
 
@@ -114,3 +145,43 @@ alias goto="ssh \$(cat ~/.my_hosts | fzf | awk '{ printf(\"%s.gw\", \$1)}')"
 ```bash
 ssh bj11
 ```
+
+# 3. ssh配置项说明
+
+可以通过man查看ssh配置说明
+
+```bash
+man ssh_config
+```
+
+配置文件示例：
+
+```bash
+Host jump
+  port 22
+
+Host * !jump
+  StrictHostKeyChecking no
+  HostName %h
+  UserKnownHostsFile /dev/null
+  LogLevel ERROR
+  IdentityFile ~/.ssh/id_rsa
+  ProxyCommand ssh -p 22 -F /dev/null jump -W %h:%p
+  SendEnv LANG LC_*
+```
+
+配置项说明：
+
+- Host: 标识设备，`*`表示通配所有字符，`!`表示例外通配。
+
+- StrictHostKeyChecking no：连接时不进行公钥交互确认操作。
+
+- UserKnownHostsFile /dev/null：不提示确认known_hosts文件。
+
+- ProxyCommand：代理命令
+
+如果使用命令加参数的方式：
+
+```bash
+ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ProxyCommand="ssh -p 22 jump -W %h:%p" 
+```