--- name: "Rex" section: "3pm" platform: "linux" package: "rex" version: "1.16.0-1" release: "Debian 13 (Trixie)" platforms: ["linux"] url: "https://new.carta.tech/Rex" --- # Rex(3pm) the friendly automation framework ## NAME Rex - the friendly automation framework ## DESCRIPTION Rex is an automation framework that is friendly to any combinations of local and remote execution, push and pull style of management, or imperative and declarative approach. Its flexibility makes it a great fit for many different use cases, but most commonly Rex is used to automate application deployment and data center infrastructure management tasks. See Rex::Commands for a starting point of available built-in commands. See rex \ for more information about how to use rex on the command line. ## SYNOPSIS ``` # In a Rexfile: use Rex -feature => [qw/1.4/]; user "root"; password "ch4ngem3"; desc "Show system information"; task "sysinfo", sub { say run "uname -a"; }; 1; # On the command line: $ rex -H server[01..10] sysinfo ``` ## CLASS METHODS ### get\_current\_connection This function is deprecated since 0.28! See Rex::Commands::connection. Returns the current connection as a hashRef. - server The server name - ssh 1 if it is a ssh connection, 0 if not. ### is\_ssh Returns 1 if the current connection is a ssh connection. 0 if not. ### is\_local Returns 1 if the current connection is local. Otherwise 0. ### is\_sudo Returns 1 if the current operation is executed within sudo. ### get\_sftp Returns the sftp object for the current ssh connection. ### connect Use this function to create a connection if you use Rex as a library. ``` use Rex; use Rex::Commands::Run; use Rex::Commands::Fs; Rex::connect( server => "remotehost", user => "root", password => "f00b4r", private_key => "/path/to/private/key/file", public_key => "/path/to/public/key/file", ); if(is_file("/foo/bar")) { print "Do something...\n"; } my $output = run("uptime"); ``` ## FEATURE FLAGS Everyone knows the pain if something gets deprecated and one has to port his old (and stable) code to a new version of a library or a framework. There is enough work to do instead of fixing code to work with newer versions of them. So there is one promise new versions of Rex has to fulfill. They must be backward compatible. I know this might be impossible in one way or another, but to minimize this danger there is a thing called feature flags. If there is the need to break backward compatibility in favor of a new feature there will be a feature flag for this change. And only if this feature flag gets enabled in the Rexfile it will break compatibility. So the default is always to remain compatible. If you have a problem that occurs after an update, it is considered as a bug. Please report this bug in our issue tracker. Also see the backwards compatibility \ section of the CONTRIBUTING guide. ### How to enable feature flags You can enable feature flags in your Rexfile with the following code: ``` use Rex -feature => ['1.4']; ``` or even multiple ones like this: ``` use Rex -feature => [qw(1.4 exec_autodie)]; ``` ### List of feature flags - 1\.4 Enable per-task argument parsing (task\_chaining\_cmdline\_args). Furthermore, all features from earlier versions are activated. Available since version 1.4. - no\_task\_chaining\_cmdline\_args Disable per-task argument parsing. Available since version 1.4. - task\_chaining\_cmdline\_args Enable per-task argument parsing: `"rex --rex --args task1 --task1arg=value task2 --task2arg"` so task1 only gets `"task1arg"` and task2 only gets `"task2arg"`. Available since version 1.4. - 1\.3 Activating the new template engine by default. Furthermore, all features from earlier versions are activated. Available since version 1.3. - no\_template\_ng Disabling the new template engine. Available since version 1.3. - 1\.0 Disabling usage of a tty. This increases compatibility for remote execution. Furthermore, all features from earlier versions are activated. Available since version 1.0. - no\_autodie Will disable autodie feature. Available since version 1.0. - tty Enable pty usage for ssh connections. Available since version 1.0. - template\_ng Enabling the new template engine (better error reporting, etc.). Available since version 0.56. - 0\.56 Will activate autodie feature. Furthermore, all features from earlier versions are activated. Available since version 0.56. - autodie Will enable autodie feature: die on all failed filesystem commands \. Available since version 1.13.1. - 0\.55 Will activate using Net::OpenSSH by default if present. Furthermore, all features from earlier versions are activated. Available since version 0.55. - 0\.54 Will activate checking services for existence before trying to manipulate them, and `set()` will overwrite already existing values (instead of concatenating). Furthermore, all features from earlier versions are activated. Available since version 0.54. - 0\.53 Will activate register\_cmdb\_top\_scope. And all things 0.51 and down activated. Available since version 0.53. - register\_cmdb\_top\_scope Will register all cmdb top scope variables automatically in the templates. Available since version 0.53. - 0\.51 Will load Rex::Constants and the CMDB by default. And all things 0.47 and down activated. Available since version 0.51. - disable\_taskname\_warning Disable warning about invalid task names (they should match `"/^[a-zA-Z_][a-zA-Z0-9_]*$/"`). Available since version 0.47. - verbose\_run Explicitly output "Successfully executed" or "Error executing" messages for `run()` commands. Available since version 0.47. - no\_cache Disable caching (like discovery results of remote OS, hardware, shell, etc.). Available since version 0.46. - no\_path\_cleanup Controls whether Rex should use the default or explicitly configured `"PATH"` settings when executing commands or not. See also the path command and the set\_path configuration option. Available since version 0.44. - source\_profile Source `"$HOME/.profile"` before running a command. Available since version 0.44. - source\_global\_profile Source `"/etc/profile"` before running a command. Available since version 0.44. - exec\_autodie If you execute a command with `run()` Rex will `die()` if the command returns a `"RETVAL != 0"`. Available since version 0.44. - exec\_and\_sleep Sometimes some commands that fork away didn't keep running. With this flag rex will wait a few ms before exiting the shell. Available since version 0.43. - disable\_strict\_host\_key\_checking Disabling strict host key checking for openssh connection mode. Available since version 0.43. - reporting Enable reporting. Available since version 0.43. - empty\_groups Enable usage of empty groups. Available since version 0.42. - use\_server\_auth Enable the usage of special authentication options for servers. Available since version 0.42. - no\_tty Disable pty usage for ssh connections. Available since version 0.41. - no\_local\_template\_vars Use global variables in templates. Available since version 0.40. - sudo\_without\_sh Run sudo commands directly without the use of 'sh'. This might break things. Available since version 0.40. - sudo\_without\_locales Run sudo commands without locales. This will break things if you don't use English locales. Available since version 0.40. - exit\_status This option tells Rex to return a non zero value on exit if a task fails. Available since version 0.39. - 0\.35 This option enables the features of 0.31 and the possibility to call tasks as a functions without the need to use a hash reference for the parameters. Available since version 0.35. - 0\.31 To enable special authentication options for a server group. This will overwrite the default authentication options for a task. Available since version 0.31. ## CONTRIBUTORS Many thanks to the contributors for their work. Please see CONTRIBUTORS \ file for a complete list. ## LICENSE Rex is a free software, licensed under: The Apache License, Version 2.0, January 2004