Erlang Erl Load File
If you have an existing RabbitMQ installation with the broker running as a service and you installed an Erlang VM with a different architecture then you must uninstall the service before updating ERLANGHOME. Set ERLANGHOME to where you actually put your Erlang installation, e.g. C: Program Files erl x.x.x (full path). The RabbitMQ batch files expect to execute%ERLANGHOME% bin erl.exe. Go to Start Settings Control Panel System Advanced Environment Variables.
Create the system environment variable ERLANGHOME and set it to the full path of the directory which contains bin erl.exe. The Erlang cookie is a shared secret used for authentication between and. The value is stored in a file commonly referred to as the Erlang cookie file. The cookie file used by the service account and the user running rabbitmqctl.bat must be synchronised for CLI tools such as rabbitmqctl.bat to function. All nodes in a cluster must have the same cookie value (cookie file contents). When running a manually installed Windows service, making sure the cookie file is in sync is the responsibility of the user.
On Windows, the cookie file location varies depending on Erlang version used and whether the HOMEDRIVE or HOMEPATH environment variables are both set. With Erlang versions starting with 20.2, the cookie file locations are:.%HOMEDRIVE%%HOMEPATH%.erlang.cookie (usually C: Users%USERNAME%.erlang.cookie for user%USERNAME%) if both the HOMEDRIVE and HOMEPATH environment variables are set.%USERPROFILE%.erlang.cookie (usually C: Users%USERNAME%.erlang.cookie) if HOMEDRIVE and HOMEPATH are not both set. For the RabbitMQ Windows service -%USERPROFILE%.erlang.cookie (usually C: WINDOWS system32 config systemprofile) On prior to 20.2 (e.g. 19.3 or 20.1), the cookie file locations are:.%HOMEDRIVE%%HOMEPATH%.erlang.cookie (usually C: Users%USERNAME%.erlang.cookie for user%USERNAME%) if both the HOMEDRIVE and HOMEPATH environment variables are set.%USERPROFILE%.erlang.cookie (usually C: Users%USERNAME%.erlang.cookie) if HOMEDRIVE and HOMEPATH are not both set. For the RabbitMQ Windows service -%WINDIR%.erlang.cookie (usually C: Windows.erlang.cookie) To ensure Erlang cookie files contain the same string, copy the.erlang.cookie file from the Windows service directory listed above to replace the user.erlang.cookie. Within the rabbitmqserver-3.7.3 sbin directory are some scripts which run commands to control the RabbitMQ server.
The RabbitMQ server can be run as either an application or service (not both). starts the broker as an application. manages the service and starts the broker. manages a running broker. Log in as an administrator. To see the output, run these from a in the sbin directory.
Note: On Windows Vista (and later) you will need to (e.g. Right-click on the icon to select Run as Administrator).
Set up the system path so you can find the server and sbin directory easily. Create a system environment variable (e.g. RABBITMQSERVER) for 'C: Program Files RabbitMQ rabbitmqserver-3.7.3'. Adjust this if you put rabbitmqserver-3.7.3 elsewhere, or if you upgrade versions. Append the literal string ';%RABBITMQSERVER% sbin' to your system path (aka%PATH%). Now you can run rabbitmq commands from any (administrator) Command Prompt. You will need to navigate to rabbitmqserver-3.7.3 sbin to run commands if your system path does not contain the RabbitMQ sbin directory.
The application is started by the rabbitmq-server.bat script in sbin. Customise RabbitMQ Server Environment Variables Environment variable defaults are set within the rabbitmq-server.bat file. You may need to for your installation. Start the Broker as an Application Run the command rabbitmq-server -detached Alternatively, you can double-click the rabbitmq-server.bat file in Windows Explorer. If you start by double-clicking, a Command Prompt window opens, displays a short banner message, concluding with the message 'completed with n plugins.' , indicating that the RabbitMQ broker has been started successfully.
If you started without the -detached option, e.g. By double-clicking, you will need a second Command Prompt window to control the application cleanly. Note: Closing the original Command Prompt window will forcefully shut down a server started this way.
Stop or Manage the Broker rabbitmq-server only starts the broker. To use rabbitmqctl commands. The service will run in the security context of the system account without the need for a user to be logged in on a console.
This is normally more appropriate for production use. The server should not be run as a service and application simultaneously. The service runs using the rabbitmq-service.bat script in sbin. Customise RabbitMQ Service Environment Variables Note: After setting environment variables, you may need to install the service again. The rabbitmq-service.bat script recognises many of the same as rabbitmq-server.bat, as well as a few additional service environment variables. Install the Service Install the service by running rabbitmq-service install A service with the name defined by RABBITMQSERVICENAME should now appear in the Windows Services control panel (Start Run services.msc). Managing the Service To manage the service (install, remove, start, stop, enable, disable), use commands.
You can also use the Windows Services panel ( services.msc) to perform some of the same functions as the service script. Start the Broker as a Service To start the broker, execute rabbitmq-service start If the output from this command is ' Service RABBITMQSERVICENAME started', then the service was started correctly. Confirm the service named RABBITMQSERVICENAME reports a 'Started' status in Services: Start Run services.msc. Firewalls and other security tools may prevent RabbitMQ from binding to a port. When that happens, RabbitMQ will fail to start.
Make sure the following ports can be opened:. 4369:, a peer discovery service used by RabbitMQ nodes and CLI tools. 5672, 5671: used by AMQP 0-9-1 and 1.0 clients without and with TLS. 25672: used by Erlang distribution for inter-node and CLI tools communication and is allocated from a dynamic range (limited to a single port by default, computed as AMQP port + 20000). See for details. 15672: clients and (only if the is enabled). 61613, 61614: without and with TLS (only if the is enabled).
1883, 8883: ( without and with TLS, if the is enabled. 15674: STOMP-over-WebSockets clients (only if the is enabled). 15675: MQTT-over-WebSockets clients (only if the is enabled) It is possible to to use different ports. To stop the broker or check its status, use rabbitmqctl.bat in sbin (as an administrator).
Stopping the Broker Use rabbitmqctl stop. Checking the Broker Status Use rabbitmqctl status. All rabbitmqctl commands will report the node absence if no broker is running (i.e.
More Logging Output from the server is sent to a RABBITMQNODENAME.log file in the RABBITMQLOGBASE directory. Additional log data is written to RABBITMQNODENAME-sasl.log.
The broker always appends to the log files, so a complete log history is retained. You can rotate logs using rabbitmqctl rotatelogs. Troubleshooting When Running as a Service In the event that the Erlang VM crashes whilst RabbitMQ is running as a service, rather than writing the crash dump to the current directory (which doesn't make sense for a service) it is written to an erlcrash.dump file in the base directory of the RabbitMQ server (set by the RABBITMQBASE environment variable, defaulting to%APPDATA%%RABBITMQSERVICENAME% - typically%APPDATA% RabbitMQ otherwise).
The erl program starts an Erlang runtime system. The exact details (for example, whether erl is a script or a program and which other programs it calls) are system-dependent.
Windows users probably wants to use the werl program instead, which runs in its own window with scrollbars and supports command-line editing. The erl program on Windows provides no line editing in its shell, and on Windows 95 there is no way to scroll back to text which has scrolled off the screen. The erl program must be used, however, in pipelines or if you want to redirect standard input or output. Starts an Erlang runtime system.
The arguments can be divided into emulator flags, flags and plain arguments:. Any argument starting with the character + is interpreted as an. As indicated by the name, emulator flags controls the behavior of the emulator. Any argument starting with the character - (hyphen) is interpreted as a which should be passed to the Erlang part of the runtime system, more specifically to the init system process, see. The init process itself interprets some of these flags, the init flags.
It also stores any remaining flags, the user flags. The latter can be retrieved by calling init:getargument/1.
It can be noted that there are a small number of '-' flags which now actually are emulator flags, see the description below. Plain arguments are not interpreted in any way.
They are also stored by the init process and can be retrieved by calling init:getplainarguments/0. Plain arguments can occur before the first flag, or after a - flag. Additionally, the flag -extra causes everything that follows to become plain arguments. In the following list, init flags are marked (init flag). Unless otherwise specified, all other flags are user flags, for which the values can be retrieved by calling init:getargument/1.
Note that the list of user flags is not exhaustive, there may be additional, application specific flags which instead are documented in the corresponding application documentation.(init flag) Everything following - up to the next flag ( -flag or +flag) is considered plain arguments and can be retrieved using init:getplainarguments/0.Application Par Val Sets the application configuration parameter Par to the value Val for the application Application, see and. Command line arguments are read from the file FileName.
The arguments read from the file replace the ' -argsfile FileName' flag on the resulting command line. The file FileName should be a plain text file and may contain comments and command line arguments. A comment begins with a # character and continues until next end of line character. Backslash ( ) is used as quoting character. All command line arguments accepted by erl are allowed, also the -argsfile FileName flag. Be careful not to cause circular dependencies between files containing the -argsfile flag, though.
The -extra flag is treated specially. Its scope ends at the end of the file. Arguments following an -extra flag are moved on the command line into the -extra section, i.e. The end of the command line following after an -extra flag.asyncshellstart The initial Erlang shell does not read user input until the system boot procedure has been completed (Erlang 5.4 and later). This flag disables the start synchronization feature and lets the shell start in parallel with the rest of the system.boot File Specifies the name of the boot file, File.boot, which is used to start the system.
Unless File contains an absolute path, the system searches for File.boot in the current and $ROOT/bin directories. Defaults to $ROOT/bin/start.boot.bootvar Var Dir If the boot script contains a path variable Var other than $ROOT, this variable is expanded to Dir. Used when applications are installed in another directory than $ROOT/lib, see.codepathcache Enables the code path cache of the code server, see.compile Mod1 Mod2. Compiles the specified modules and then terminates (with non-zero exit code if the compilation of some file did not succeed). Implies -noinput. Not recommended - use instead.config Config Specifies the name of a configuration file, Config.config, which is used to configure applications.
If this flag is present, global will not maintain a fully connected network of distributed Erlang nodes, and then global name registration cannot be used.cookie Cookie Obsolete flag without any effect and common misspelling for -setcookie. Use -setcookie instead.detached Starts the Erlang runtime system detached from the system console. Useful for running daemons and backgrounds processes. Implies -noinput.emuargs Useful for debugging. Prints out the actual arguments sent to the emulator.env Variable Value Sets the host OS environment variable Variable to the value Value for the Erlang runtime system. % erl -env DISPLAY gin:0 In this example, an Erlang runtime system is started with the DISPLAY environment variable set to gin:0.eval Expr(init flag) Makes init evaluate the expression Expr, see.extra(init flag) Everything following -extra is considered plain arguments and can be retrieved using init:getplainarguments/0.heart Starts heart beat monitoring of the Erlang runtime system.hidden Starts the Erlang runtime system as a hidden node, if it is run as a distributed node.
Hidden nodes always establish hidden connections to all other nodes except for nodes in the same global group. Hidden connections are not published on either of the connected nodes, i.e. Neither of the connected nodes are part of the result from nodes/0 on the other node. See also hidden global groups,.hosts Hosts Specifies the IP addresses for the hosts on which Erlang boot servers are running, see. This flag is mandatory if the -loader inet flag is present. The IP addresses must be given in the standard form (four decimal numbers separated by periods, for example '150.236.20.74'.
Hosts names are not acceptable, but a broadcast address (preferably limited to the local network) is.id Id Specifies the identity of the Erlang runtime system. If it is run as a distributed node, Id must be identical to the name supplied together with the -sname or -name flag.initdebug Makes init write some debug information while interpreting the boot script. Selects an instrumented Erlang runtime system (virtual machine) to run, instead of the ordinary one.
When running an instrumented runtime system, some resource usage data can be obtained and analysed using the module instrument. Functionally, it behaves exactly like an ordinary Erlang runtime system.loader Loader Specifies the method used by erlprimloader to load Erlang modules into the system. Two Loader methods are supported, efile and inet. Efile means use the local file system, this is the default. Inet means use a boot server on another machine, and the -id, -hosts and -setcookie flags must be specified as well. If Loader is something else, the user supplied Loader port program is started.make Makes the Erlang runtime system invoke make:all in the current working directory and then terminate. Implies -noinput.man Module Displays the manual page for the Erlang module Module.
Only supported on Unix.mode interactive embedded Indicates if the system should load code dynamically ( interactive), or if all code should be loaded during system initialization ( embedded), see. Defaults to interactive.name Name Makes the Erlang runtime system into a distributed node. This flag invokes all network servers necessary for a node to become distributed. It is also ensured that epmd runs on the current host before Erlang is started. The name of the node will be Name@Host, where Host is the fully qualified host name of the current host.
For short names, use the -sname flag instead.noinput Ensures that the Erlang runtime system never tries to read any input. Implies -noshell.noshell Starts an Erlang runtime system with no shell.
This flag makes it possible to have the Erlang runtime system as a component in a series of UNIX pipes.nostick Disables the sticky directory facility of the Erlang code server, see.oldshell Invokes the old Erlang shell from Erlang 3.3. The old shell can still be used.pa Dir1 Dir2. Adds the specified directories to the beginning of the code path, similar to code:addpathsa/1.
As an alternative to -pa, if several directories are to be prepended to the code and the directories have a common parent directory, that parent directory could be specified in the ERLLIBS environment variable.pz Dir1 Dir2. Adds the specified directories to the end of the code path, similar to code:addpathsz/1.remsh Node Starts Erlang with a remote shell connected to Node.rsh Program Specifies an alternative to rsh for starting a slave node on a remote host.run Mod Func Arg1, Arg2.(init flag) Makes init call the specified function. Func defaults to start. If no arguments are provided, the function is assumed to be of arity 0. Otherwise it is assumed to be of arity 1, taking the list Arg1,Arg2.
as argument. All arguments are passed as strings.s Mod Func Arg1, Arg2.(init flag) Makes init call the specified function. Func defaults to start.
If no arguments are provided, the function is assumed to be of arity 0. Otherwise it is assumed to be of arity 1, taking the list Arg1,Arg2.
as argument. All arguments are passed as atoms.setcookie Cookie Sets the magic cookie of the node to Cookie, see.shutdowntime Time Specifies how long time (in milliseconds) the init process is allowed to spend shutting down the system.
If Time ms have elapsed, all processes still existing are killed. Defaults to infinity.sname Name Makes the Erlang runtime system into a distributed node, similar to -name, but the host name portion of the node name Name@Host will be the short name, not fully qualified. This is sometimes the only way to run distributed Erlang if the DNS (Domain Name System) is not running. There can be no communication between nodes running with the -sname flag and those running with the -name flag, as node names must be unique in distributed Erlang systems.smp enable and -smp starts the Erlang runtime system with SMP support enabled. This may fail if no runtime system with SMP support is available.smp auto starts the Erlang runtime system with SMP support enabled if it is available and more than one logical processor are detected.smp disable starts a runtime system without SMP support.
NOTE: The runtime system with SMP support will not be available on all supported platforms. See also the flag.version(emulator flag) Makes the emulator print out its version number. The same as erl +V. % erl +sct L0-3c0-3 +sbt db +S3:2 -detached -noinput -noshell -sname one% erl +sct L3-0c0-3 +sbt db +S3:2 -detached -noinput -noshell -sname two In this example each runtime system have two schedulers each online, and all schedulers online will run on different cores.
If we change to one scheduler online on one runtime system, and three schedulers online on the other, all schedulers online will still run on different cores. Note that a faked CPU topology that does not reflect how the real CPU topology looks like is likely to decrease the performance of the runtime system. For more information, see. Enable or disable eager check I/O scheduling.
The default is currently false, but will most likely be changed to true in OTP 18. The behaviour before this flag was introduced corresponds to +secio false. The flag effects when schedulers will check for I/O operations possible to execute, and when such I/O operations will execute. As the name of the parameter implies, schedulers will be more eager to check for I/O when true is passed.
This however also implies that execution of outstanding I/O operation will not be prioritized to the same extent as when false is passed. Returns the value of this parameter used when starting the VM. Set scheduler forced wakeup interval. All run queues will be scanned each Interval milliseconds. While there are sleeping schedulers in the system, one scheduler will be woken for each non-empty run queue found. An Interval of zero disables this feature, which also is the default.
This feature has been introduced as a temporary workaround for lengthy executing native code, and native code that do not bump reductions properly in OTP. When these bugs have be fixed the +sfwi flag will be removed. Try to set scheduler bind type.
The same as the flag with the exception of how some errors are handled. For more information, see the documentation of the flag. Enable or disable balancing of load. By default scheduler utilization balancing is disabled and instead scheduler compaction of load is enabled which will strive for a load distribution which causes as many scheduler threads as possible to be fully loaded (i.e., not run out of work). When scheduler utilization balancing is enabled the system will instead try to balance scheduler utilization between schedulers.
That is, strive for equal scheduler utilization on all schedulers. +sub true is only supported on systems where the runtime system detects and use a monotonically increasing high resolution clock. On other systems, the runtime system will fail to start. +sub true implies. The difference between +sub true and +scl false is that +scl false will not try to balance the scheduler utilization. Set scheduler wake cleanup threshold.
Default is medium. This flag controls how eager schedulers should be requesting wake up due to certain cleanup operations. When a lazy setting is used, more outstanding cleanup operations can be left undone while a scheduler is idling. When an eager setting is used, schedulers will more frequently be woken, potentially increasing CPU-utilization. NOTE: This flag may be removed or changed at any time without prior notice.
Set scheduler wakeup strategy. Default strategy changed in erts-5.10/OTP-R16A. This strategy was previously known as proposal in OTP-R15. The legacy strategy was used as default from R13 up to and including R15. NOTE: This flag may be removed or changed at any time without prior notice. Set scheduler wakeup threshold.
Erlang Erl Load Files
Default is medium. The threshold determines when to wake up sleeping schedulers when more work than can be handled by currently awake schedulers exist. A low threshold will cause earlier wakeups, and a high threshold will cause later wakeups. Early wakeups will distribute work over multiple schedulers faster, but work will more easily bounce between schedulers. NOTE: This flag may be removed or changed at any time without prior notice. Set default scheduler hint for port parallelism. If set to true, the VM will schedule port tasks when doing so will improve parallelism in the system.
Erlang Erl Load File Download
If set to false, the VM will try to perform port tasks immediately, improving latency at the expense of parallelism. If this flag has not been passed, the default scheduler hint for port parallelism is currently false. The default used can be inspected in runtime by calling.
The default can be overriden on port creation by passing the option to. Suggested stack size, in kilowords, for scheduler threads. Valid range is 4-8192 kilowords. The default stack size is OS dependent. Set the maximum number of atoms the VM can handle. Default is 1048576. Enables modified timing and sets the modified timing level.
Currently valid range is 0-9. The timing of the runtime system will change. A high level usually means a greater change than a low level.
Changing the timing can be very useful for finding timing related bugs. Currently, modified timing affects the following: Process spawning A process calling spawn, spawnlink, spawnmonitor, or spawnopt will be scheduled out immediately after completing the call. When higher modified timing levels are used, the caller will also sleep for a while after being scheduled out. Context reductions The amount of reductions a process is a allowed to use before being scheduled out is increased or reduced. Input reductions The amount of reductions performed before checking I/O is increased or reduced. NOTE: Performance will suffer when modified timing is enabled. This flag is only intended for testing and debugging.
Also note that returnto and returnfrom trace messages will be lost when tracing on the spawn BIFs. This flag may be removed or changed at any time without prior notice. +V Makes the emulator print out its version number. +W w i Sets the mapping of warning messages for errorlogger.
Erlang Erl Load File System
Messages sent to the error logger using one of the warning routines can be mapped either to errors (default), warnings ( +W w), or info reports ( +W i). The current mapping can be retrieved using errorlogger:warningmap/0. See for further information. +zFlag Value Miscellaneous flags. Set the distribution buffer busy limit (.