inet_db 存储ip host别名

22 %% Store info about ip addresses, names, aliases host files resolver

 23 %% options

  82 -record(state, 

  83         {db,                %% resolver data

  84          cache,             %% bag of resource records

  85          hosts_byname,      %% hosts table

  86          hosts_byaddr,      %% hosts table

  87          hosts_file_byname, %% hosts table from system file

  88          hosts_file_byaddr, %% hosts table from system file

  89          cache_timer        %% timer reference for refresh

  90         }).

%% Reconstruct an inetrc sturcture from inet_db

 311 get_rc() -> 

 312     get_rc([hosts, domain, nameservers, search, alt_nameservers,

 313             timeout, retry, inet6, usevc,

 314             edns, udp_payload_size, resolv_conf, hosts_file,

 315             socks5_server,  socks5_port, socks5_methods, socks5_noproxy,

 316             udp, sctp, tcp, host, cache_size, cache_refresh, lookup], []).   

2> inet_db:get_rc().

[{nameservers,{202,106,0,20}},

 {resolv_conf,"/etc/resolv.conf"},

 {hosts_file,"/etc/hosts"},

 {lookup,[native]}]