socket.gaierror: [Errno -3] Temporary failure in name resolution

此处是因为localhost.localdomain无法解析造成的，此时修改/etc/hosts，添加如下行解决

127.0.0.1       localhost.localdomain localhost

Temporary failure in name resolution 错误解决方法:

vim /etc/resolv.conf

'添加了两行（DNS地址是咨询了服务器运营商得知的）'
nameserver   202.96.209.133
nameserver   61.129.88.123
nameserver 114.114.114.114

运行sudo 命令 can not resovle host xxx 错误解决方法:

vim /etc/hosts
127.0.0.1 localhost
127.0.0.1 <your hostname>

cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.128.40 dev-nn001

cat /etc/hostname
prd-spider002

参考：https://blog.csdn.net/feiying00544/article/details/83113460
https://blog.csdn.net/zeli1511/article/details/80362632
http://lax.v2ex.com/t/462728