在节点引导之前取消设置所有路径

3 回答

• 0

  你认为奴隶类型的节点是由“奴隶”命名的吗？

  以下代码来自项目tsung，文件名为“ts_os_mon_erlang.erl” .

  start_beam(Host) ->
      Args = ts_utils:erl_system_args(),
      ?LOGF("Starting os_mon beam on host ~p ~n", [Host], ?NOTICE),
      ?LOGF("~p Args: ~p~n", [Host, Args], ?DEB),
      slave:start(list_to_atom(Host), ?NODE, Args).
  

  另外，从模块限制如下：

  Slave nodes on other hosts than the current one are started with the program rsh. The user must be allowed to rsh to the remote hosts without being prompted for a password. This can be arranged in a number of ways (refer to the rsh documentation for details). A slave node started on the same host as the master inherits certain environment values from the master, such as the current directory and the environment variables. For what can be assumed about the environment when a slave is started on another host, read the documentation for the rsh program.
  
  An alternative to the rsh program can be specified on the command line to erl as follows: -rsh Program.
  
  The slave node should use the same file system at the master. At least, Erlang/OTP should be installed in the same place on both computers and the same version of Erlang should be used.
  

  如果要启动具有不同路径的节点，我认为您可以通过具有不同环境变量的脚本来实现，对于主节点而不是从节点 .

  回复于 2024-05-19T20:38:48+08:00
• 0

  我认为螺纹钢项目可以帮助实现类似的目的 . 它包括如何操纵路径：

  从 rebar_core.erl file：process_dir1（Dir，Command，DirSet，Config，CurrentCodePath，{DirModules，ModuleSetFile}） - > Config0 = rebar_config：set（Config，current_command，Command），%%获取"any dir"的模块列表 . 这是除了与此目录类型相关联的%%模块之外，还处理的模块的全部列表%% . 这些any_dir模块被处理为%% FIRST . {ok，AnyDirModules} = application：get_env（rebar，any_dir_modules），

  Modules = AnyDirModules ++ DirModules,
  
      %% Invoke 'preprocess' on the modules -- this yields a list of other
      %% directories that should be processed _before_ the current one.
      {Config1, Predirs} = acc_modules(Modules, preprocess, Config0,
                                       ModuleSetFile),
  
      %% Remember associated pre-dirs (used for plugin lookup)
      PredirsAssoc = remember_cwd_predirs(Dir, Predirs),
  
      %% Get the list of plug-in modules from rebar.config. These
      %% modules may participate in preprocess and postprocess.
      {ok, PluginModules} = plugin_modules(Config1, PredirsAssoc),
  
      {Config2, PluginPredirs} = acc_modules(PluginModules, preprocess,
                                             Config1, ModuleSetFile),
  
      AllPredirs = Predirs ++ PluginPredirs,
  
      ?DEBUG("Predirs: ~p\n", [AllPredirs]),
      {Config3, DirSet2} = process_each(AllPredirs, Command, Config2,
                                        ModuleSetFile, DirSet),
  
      %% Make sure the CWD is reset properly; processing the dirs may have
      %% caused it to change
      ok = file:set_cwd(Dir),
  
      %% Check that this directory is not on the skip list
      Config7 = case rebar_config:is_skip_dir(Config3, Dir) of
                    true ->
                        %% Do not execute the command on the directory, as some
                        %% module has requested a skip on it.
                        ?INFO("Skipping ~s in ~s\n", [Command, Dir]),
                        Config3;
  
                    false ->
                        %% Check for and get command specific environments
                        {Config4, Env} = setup_envs(Config3, Modules),
  
                        %% Execute any before_command plugins on this directory
                        Config5 = execute_pre(Command, PluginModules,
                                              Config4, ModuleSetFile, Env),
  
                        %% Execute the current command on this directory
                        Config6 = execute(Command, Modules ++ PluginModules,
                                          Config5, ModuleSetFile, Env),
  
                        %% Execute any after_command plugins on this directory
                        execute_post(Command, PluginModules,
                                     Config6, ModuleSetFile, Env)
                end,
  
      %% Mark the current directory as processed
      DirSet3 = sets:add_element(Dir, DirSet2),
  
      %% Invoke 'postprocess' on the modules. This yields a list of other
      %% directories that should be processed _after_ the current one.
      {Config8, Postdirs} = acc_modules(Modules ++ PluginModules, postprocess,
                                        Config7, ModuleSetFile),
      ?DEBUG("Postdirs: ~p\n", [Postdirs]),
      Res = process_each(Postdirs, Command, Config8,
                         ModuleSetFile, DirSet3),
  
      %% Make sure the CWD is reset properly; processing the dirs may have
      %% caused it to change
      ok = file:set_cwd(Dir),
  
      %% Once we're all done processing, reset the code path to whatever
      %% the parent initialized it to
      restore_code_path(CurrentCodePath),
  
      %% Return the updated {config, dirset} as result
      Res.
  
  restore_code_path(no_change) ->
      ok;
  restore_code_path({added, Paths}) ->
      %% Verify that all of the paths still exist -- some dynamically
      %% added paths can get blown away during clean.
      [code:del_path(F) || F <- Paths, erl_prim_loader_is_file(F)],
      ok.
  
  erl_prim_loader_is_file(File) ->
      erl_prim_loader:read_file_info(File) =/= error.
  

  回复于 2024-05-19T20:38:48+08:00
• 0

  确保使用 -setcookie 选项 . 从 erl -man erl 页面：

  -loader Loader：指定erl_prim_loader用于将Erlang模块加载到系统中的方法 . 请参阅erl_prim_loader（3） . 支持两种Loader方法，efile和inet . efile表示使用本地文件系统，这是默认设置 . inet表示在另一台机器上使用引导服务器，并且还必须指定-id，-hosts和-setcookie标志 . 如果Loader是其他内容，则启动用户提供的Loader端口程序 .

  回复于 2024-05-19T20:38:48+08:00