4.2.11. cuttlefish¶

把erlang的配置文件与sysctl-like相互转换 [1]

用法:

./cuttlefish [-h] [-e [<etc_dir>]] [-d <dest_dir>]
                                  [-f [<dest_file>]] [-s <schema_dir>]
                                  [-i <schema_file>] [-c <conf_file>]
                                  [-a <app_config>] [-l [<log_level>]]
                                  [-p] [-m [<max_history>]]

-h, --help         Print this usage page
-e, --etc_dir      etc dir [default: /etc]
-d, --dest_dir     specifies the directory to write the config file to
-f, --dest_file    the file name to write [default: app]
-s, --schema_dir   a directory containing .schema files
-i, --schema_file  individual schema file, will be processed in command
                   line order, after -s
-c, --conf_file    a cuttlefish conf file, multiple files allowed
-a, --app_config   the advanced erlangy app.config
-l, --log_level    log level for cuttlefish output [default: notice]
-p, --print        prints schema mappings on stderr
-m, --max_history  the maximum number of generated config files to keep
                   [default: 3]

命令:

//
cuttlefish -l info -e etc/ -c etc/emq.conf -i priv/emq.schema -d data/

实例¶

etc/test.conf:

erlang.smp = enable
nodename = gordon@domain.com

erlang.distribution.port_range.maximum = 8888

erlang.distribution.net_ticktime = 60

priv/test.schema:

%%-*- mode: erlang -*-

{mapping, "erlang.smp", "vm_args.-smp", [
  {default, enable},
  {datatype, {enum, [enable, auto, disable]}},
  hidden
]}.

{mapping, "nodename", "vm_args.-name", [
  {default, "{{node}}"}
]}.


%% @see erlang.distribution.port_range.minimum
{mapping, "erlang.distribution.port_range.maximum", "kernel.inet_dist_listen_max", [
  {commented, 7999},
  {datatype, integer},
  hidden
]}.

{mapping, "erlang.distribution.net_ticktime", "vm_args.-kernel net_ticktime", [
  {commented, 60},
  {datatype, integer},
  hidden
]}.

执行命令:

./cuttlefish -e ./etc -c ./etc/test.conf -i priv/test.schema -d data
// 执行后会在目录data下生成2个文件app.yyyy.mm.dd.hh.MM.ss.config和vm.xxxxx.args

app.xxx.config:

[{kernel,[{inet_dist_listen_max,8888}]},
{riak_kv,[{anti_entropy_build_limit,{1,3600000}}]}].

vm.xxx.args:

-kernel net_ticktime 60
-name gordon@domain.com
-smp enable