docs(ssh): ssh_config: terminating, 1 bad configuration options

docs/ssh/ssh_config: terminating, 1 bad configuration options.md

@@ -0,0 +1,62 @@
+
+# /etc/ssh/ssh_config: terminating, 1 bad configuration options
+
+## 问题复现
+
+使用`ssh`登录远程服务器，遇到如下问题：
+
+```
+$ ssh root@47.240.173.235 -vv
+OpenSSH_7.2p2 Ubuntu-4ubuntu2.4, OpenSSL 1.0.2g  1 Mar 2016
+debug1: Reading configuration data /etc/ssh/ssh_config
+/etc/ssh/ssh_config: line 1: Bad configuration option: maxstartups
+debug1: /etc/ssh/ssh_config line 19: Applying options for *
+/etc/ssh/ssh_config: terminating, 1 bad configuration options
+```
+
+尝试使用`git`克隆远程仓库，也遇到以下问题
+
+```
+$ git clone git@47.xxx.xxx.235:/data/repositories/hello.git
+Cloning into 'hello'...
+/etc/ssh/ssh_config: line 1: Bad configuration option: maxstartups
+/etc/ssh/ssh_config: terminating, 1 bad configuration options
+fatal: Could not read from remote repository.
+
+Please make sure you have the correct access rights
+and the repository exists.
+```
+
+## 问题解析
+
+参考：[ssh: Bad configuration option: usedns](https://www.cnblogs.com/minglee/p/11210203.html)
+
+搜索`/etc/ssh/ssh_config`，第一行内容如下：
+
+```
+/etc/ssh$ cat ssh_config 
+MaxStartups 100
+...
+```
+
+上面这个命令是为了扩大服务端`ssh`的连接限制而添加的。又搜索了`sshd_config`文件，发现如下内容：
+
+```
+$ cat sshd_config | grep Max -i
+#MaxStartups 10:30:60
+```
+
+所以之前的修改错了，取消`ssh_config`中的修改；将`MaxStartups 30`重新添加到`sshd_config`
+
+```
+$ cat sshd_config | grep Max -i
+MaxStartups 30
+#MaxStartups 10:30:60
+```
+
+重启`ssh/sshd`
+
+```
+$ sudo systemctl restart ssh
+$ sudo systemctl restart sshd
+```

mkdocs.yml

@@ -81,4 +81,5 @@ nav:
             - 'ssh: connect to host github.com port 22: Connection timed out': './ssh/ssh: connect to host github.com port 22: Connection timed out.md'
             - 'Bad owner or permissions on .ssh config': './ssh/Bad owner or permissions on .ssh config.md'
             - 'ssh_exchange_identification: Connection closed by remote host': './ssh/ssh_exchange_identification: Connection closed by remote host.md'
-            - 'Permission denied (publickey)': './ssh/Permission denied (publickey).md'
+            - 'Permission denied (publickey)': './ssh/Permission denied (publickey).md'
+            - '/etc/ssh/ssh_config: terminating, 1 bad configuration options': './ssh/ssh_config: terminating, 1 bad configuration options.md'