程序部署到客户端机器上不能运行,debug发现是gethostbyname 返回null,导致获取不到本机IP。
经查是因为修改机器名称后没有修改/etc/hosts文件
查看机器名如下:
$ cat /etc/hostname
abcd123
查看/etc/hosts找不到abcd123对应的iP地址
$ cat /etc/hosts127.0.0.1 localhost
# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
解决办法:
为abcd123指定一个IP地址,如下
$ cat /etc/hosts
127.0.0.1 localhost
127.0.1.1 abcd123
# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters