docs(faq): linux apt-get update 失败：DNS解析错误

Document-Collection · Sep 21, 2019 · 40550ab · 40550ab
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diff --git a/docs/source/docker/FAQ.md b/docs/source/docker/FAQ.md
@@ -44,4 +44,96 @@ $ sudo service docker start
 $ ps aux | grep docker
 root      8263  2.0  0.5 805596 82912 ?        Ssl  16:19   0:00 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
 zj        8468  0.0  0.0  15964  1016 pts/2    R+   16:19   0:00 grep --color=auto docker
+```
+
+## docker build运行apt-get update失败
+
+进入`ubuntu:18.04`容器，运行`apt-get update`失败
+
+```
+$ docker run -it ubuntu:18.04
+root@06f6c91954e1:/# apt-get update
+Err:1 http://security.ubuntu.com/ubuntu bionic-security InRelease        
+  Temporary failure resolving 'security.ubuntu.com'
+Err:2 http://archive.ubuntu.com/ubuntu bionic InRelease                  
+  Temporary failure resolving 'archive.ubuntu.com'
+Err:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
+  Temporary failure resolving 'archive.ubuntu.com'
+Err:4 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
+  Temporary failure resolving 'archive.ubuntu.com'
+Reading package lists... Done        
+W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic/InRelease  Temporary failure resolving 'archive.ubuntu.com'
+W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  Temporary failure resolving 'archive.ubuntu.com'
+W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease  Temporary failure resolving 'archive.ubuntu.com'
+W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease  Temporary failure resolving 'security.ubuntu.com'
+W: Some index files failed to download. They have been ignored, or old ones used instead.
+root@06f6c91954e1:/# 
+```
+
+### 发现问题
+
+测试是否是`DNS`解析出错，测试命令如下：
+
+``` 
+$ docker run busybox nslookup baidu.com
+nslookup: write to '127.0.1.1': Connection refused
+;; connection timed out; no servers could be reached
+```
+
+启动镜像`busybox`，使用`nslookup`搜索`baidu.com`对应`IP`，发现没有找到`DNS`服务器
+
+### 解决
+
+参考[SOLVED: Docker build “Could not resolve ‘archive.ubuntu.com’” apt-get fails to install anything](https://medium.com/@faithfulanere/solved-docker-build-could-not-resolve-archive-ubuntu-com-apt-get-fails-to-install-anything-9ea4dfdcdcf2)，默认`Docker`使用`8.8.8.8`作为`DNS`服务器地址，而不是主机的`DNS`服务器地址
+
+搜索主机的`DNS`服务器：
+
+```
+$ nmcli dev show | grep 'IP4.DNS'
+IP4.DNS[1]:                             192.168.0.1
+```
+
+**临时解决方式：参数配置**
+
+```
+$ docker run --dns 192.168.0.1 busybox nslookup www.baidu.com
+Server:		192.168.0.1
+Address:	192.168.0.1:53
+
+Non-authoritative answer:
+www.baidu.com	canonical name = www.a.shifen.com
+Name:	www.a.shifen.com
+Address: 112.80.248.76
+Name:	www.a.shifen.com
+Address: 112.80.248.75
+
+*** Can't find www.baidu.com: No answer
+```
+
+**永久解决方式：配置Docker守护进程**
+
+修改配置文件`/etc/docker/daemon.json`，添加主机`DNS`服务器后重启`Docker`守护进程
+
+```
+{
+    "dns": ["192.168.0.1", "8.8.8.8", "8.8.4.4"]
+}
+```
+
+*后面两个地址是google提供的DNS服务器地址*
+
+```
+$ systemctl restart docker
+
+$ docker run busybox nslookup baidu.com
+Server:		192.168.0.1
+Address:	192.168.0.1:53
+
+Non-authoritative answer:
+Name:	baidu.com
+Address: 220.181.38.148
+Name:	baidu.com
+Address: 39.156.69.79
+
+*** Can't find baidu.com: No answer
 ```