kernel

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Start, stop, supervision, configuration, and distribution of applications

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Code loading

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Logging

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Global name service

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Supervision of Erlang/OTP

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Communication with sockets

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Operating system interface

sigusr1:

The default handler will halt Erlang and produce a crashdump with slogan "Received SIGUSR1". This is equivalent to calling erlang:halt("Received SIGUSR1").

sigquit:

The default handler will halt Erlang immediately. This is equivalent to calling erlang:halt().

sigterm:

The default handler will terminate Erlang normally. This is equivalent to calling init:stop().

sighup:

Hangup detected on controlling terminal or death of controlling process

sigquit:

Quit from keyboard

sigabrt:

Abort signal from abort

sigalrm:

Timer signal from alarm

sigterm:

Termination signal

sigusr1:

User-defined signal 1

sigusr2:

User-defined signal 2

sigchld:

Child process stopped or terminated

sigstop:

Stop process

sigtstp:

Stop typed at terminal

connect_all = true | false:

If enabled (true), which also is the default, global(3erl) will actively connect to all nodes that becomes known to it. Note that you also want to enable prevent_overlapping_partitions in order for global to ensure that a fully connected network is maintained. prevent_overlapping_partitions will also prevent inconsistencies in global's name registration and locking.

distributed = [Distrib]:

Specifies which applications that are distributed and on which nodes they are allowed to execute. In this parameter:

dist_auto_connect = Value:

Specifies when nodes are automatically connected. If this parameter is not specified, a node is always automatically connected, for example, when a message is to be sent to that node. Value is one of:

permissions = [Perm]:

Specifies the default permission for applications when they are started. In this parameter:

logger = [Config]:

Specifies the configuration for Logger, except the primary log level, which is specified with logger_level, and the compatibility with SASL Error Logging, which is specified with logger_sasl_compatible.

logger_level = Level:

Specifies the primary log level for Logger. Log events with the same, or a more severe level, pass through the primary log level check. See section Logging in the Kernel User's Guide for more information about Logger and log levels.

logger_metadata = Metadata:

Specifies primary metadata for log events.

logger_sasl_compatible = true | false:

Specifies if Logger behaves backwards compatible with the SASL error logging functionality from releases prior to Erlang/OTP 21.0.

global_groups = [GroupTuple]:

Defines global groups, see global_group(3erl). In this parameter:

inet_default_connect_options = [{Opt, Val}]:

Specifies default options for connect sockets, see inet(3erl).

inet_default_listen_options = [{Opt, Val}]:

Specifies default options for listen (and accept) sockets, see inet(3erl).

inet_dist_use_interface = ip_address():

If the host of an Erlang node has many network interfaces, this parameter specifies which one to listen on. For the type definition of ip_address(), see inet(3erl).

inet_dist_listen_min = First

 

inet_dist_listen_max = Last: Defines the First..Last port range for the listener socket of a distributed Erlang node.

inet_dist_listen_options = Opts:

Defines a list of extra socket options to be used when opening the listening socket for a distributed Erlang node. See gen_tcp:listen/2.

inet_dist_connect_options = Opts:

Defines a list of extra socket options to be used when connecting to other distributed Erlang nodes. See gen_tcp:connect/4.

inet_parse_error_log = silent:

If set, no log events are issued when erroneous lines are found and skipped in the various Inet configuration files.

inetrc = Filename:

The name (string) of an Inet user configuration file. For details, see section Inet Configuration in the ERTS User's Guide.

net_setuptime = SetupTime:

net_ticker_spawn_options = Opts:

Defines a list of extra spawn options for net ticker processes. There exist one such process for each connection to another node. A net ticker process is responsible for supervising the connection it is associated with. These processes also execute the distribution handshake protocol when setting up connections. When there is a large number of distribution connections, setting up garbage collection options can be helpful to reduce memory usage. Default is [link, {priority, max}], and these two options cannot be changed. The monitor and {monitor, MonitorOpts} options are not allowed and will be dropped if present. See the documentation of the erlang:spawn_opt/4 BIF for information about valid options. If the Opts list is not a proper list, or containing invalid options the setup of connections will fail.

net_tickintensity = NetTickIntensity:

Net tick intensity specifies how many ticks to send during a net tick time period when no other data is sent over a connection to another node. This also determines how often to check for data from the other node. The higher net tick intensity, the closer to the chosen net tick time period the node will detect an unresponsive node. The net tick intensity defaults to 4. The value of NetTickIntensity should be an integer in the range 4..1000. If the NetTickIntensity is not an integer or an integer less than 4, 4 will silently be used. If NetTickIntensity is an integer larger than 1000, 1000 will silently be used.

net_ticktime = NetTickTime:

Specifies the net tick time in seconds. This is the approximate time a connected node may be unresponsive until it is considered down and thereby disconnected.

MinT = NetTickTime - NetTickTime / NetTickIntensity
MaxT = NetTickTime + NetTickTime / NetTickIntensity

prevent_overlapping_partitions = true | false:

If enabled (true), global will actively prevent overlapping partitions from forming when connections are lost between nodes. This fix is enabled by default. If you are about to disable this fix, make sure to read the global(3erl) documentation about this fix for more important information about this.

shutdown_timeout = integer() | infinity:

Specifies the time application_controller waits for an application to terminate during node shutdown. If the timer expires, application_controller brutally kills application_master of the hanging application. If this parameter is undefined, it defaults to infinity.

sync_nodes_mandatory = [NodeName]:

Specifies which other nodes that must be alive for this node to start properly. If some node in the list does not start within the specified time, this node does not start either. If this parameter is undefined, it defaults to [].

sync_nodes_optional = [NodeName]:

Specifies which other nodes that can be alive for this node to start properly. If some node in this list does not start within the specified time, this node starts anyway. If this parameter is undefined, it defaults to the empty list.

sync_nodes_timeout = integer() | infinity:

Specifies the time (in milliseconds) that this node waits for the mandatory and optional nodes to start. If this parameter is undefined, no node synchronization is performed. This option ensures that global is synchronized.

start_distribution = true | false:

Starts all distribution services, such as rpc, global, and net_kernel if the parameter is true. This parameter is to be set to false for systems who want to disable all distribution functionality.

start_dist_ac = true | false:

Starts the dist_ac server if the parameter is true. This parameter is to be set to true for systems using distributed applications.

start_boot_server = true | false:

Starts the boot_server if the parameter is true (see erl_boot_server(3erl)). This parameter is to be set to true in an embedded system using this service.

boot_server_slaves = [SlaveIP]:

If configuration parameter start_boot_server is true, this parameter can be used to initialize boot_server with a list of slave IP addresses:

start_disk_log = true | false:

Starts the disk_log_server if the parameter is true (see disk_log(3erl)). This parameter is to be set to true in an embedded system using this service.

start_pg = true | false:

start_timer = true | false:

Starts the timer_server if the parameter is true (see timer(3erl)). This parameter is to be set to true in an embedded system using this service.

shell_history = enabled | disabled | module():

Specifies whether shell history should be logged to disk between usages of erl (enabled), not logged at all (disabled), or a user-specified module will be used to log shell history. This module should export load() -> [string()] returning a list of strings to load in the shell when it starts, and add(iodata()) -> ok. called every time new line is entered in the shell. By default logging is disabled.

shell_history_drop = [string()]:

Specific log lines that should not be persisted. For example ["q().", "init:stop()."] will allow to ignore commands that shut the node down. Defaults to [].

shell_history_file_bytes = integer():

How many bytes the shell should remember. By default, the value is set to 512kb, and the minimal value is 50kb.

shell_history_path = string():

Specifies where the shell history files will be stored. defaults to the user's cache directory as returned by filename:basedir(user_cache, "erlang-history").

shutdown_func = {Mod, Func}:

Where:

source_search_rules = [DirRule] | [SuffixRule] :

error_logger:

Replaced by setting the type, and possibly file and modes parameters of the default logger_std_h handler. Example:

erl -kernel logger '[{handler,default,logger_std_h,#{config=>#{file=>"/tmp/erlang.log"}}}]'
      

error_logger_format_depth:

Replaced by setting the depth parameter of the default handlers formatter. Example:

erl -kernel logger '[{handler,default,logger_std_h,#{formatter=>{logger_formatter,#{legacy_header=>true,template=>[{logger_formatter,header},"\n",msg,"\n"],depth=>10}}}]'