syslog-ng Premium Edition 7.0.34 - Administration Guide

The sentinel() destination of syslog-ng Premium Edition (syslog-ng PE) can directly post log messages to Microsoft Azure Sentinel using its HTTP Data Collector API. The sentinel() destination has the following options.

auth-secret()

Type:	Provided by Microsoft: Base64-encoded secret, identifying your application. On the syslog-ng PE side, it is handled as string.
Default:	N/A

Description: A unique option for syslog-ng PE's sentinel() destination. This parameter is required so that syslog-ng PE can authenticate to Microsoft servers. You can collect the required credentials on your Microsoft Azure Sentinel Workspace.

For more information, see Getting the required credentials to configure syslog-ng PE as a Data Connector for Microsoft Azure Sentinel.

batch-bytes()

Accepted values:	number [bytes]
Default:	none

Description: Sets the maximum size of payload in a batch. If the size of the messages reaches this value, syslog-ng PE sends the batch to the destination even if the number of messages is less than the value of the batch-lines() option.

Note that if the batch-timeout() option is enabled and the queue becomes empty, syslog-ng PE flushes the messages only if batch-timeout() expires, or the batch reaches the limit set in batch-bytes().

Available in syslog-ng PE version 7.0.12 and later.

batch-lines()

Type:	number [lines]
Default:	1

Description: Specifies how many lines are flushed to a destination in one batch. The syslog-ng PE application waits for this number of lines to accumulate and sends them off in a single batch. Increasing this number increases throughput as more messages are sent in a single batch, but also increases message latency.

For example, if you set batch-lines() to 100, syslog-ng PE waits for 100 messages.

If the batch-timeout() option is disabled, the syslog-ng PE application flushes the messages if it has sent batch-lines() number of messages, or the queue became empty. If you stop or reload syslog-ng PE or in case of network sources, the connection with the client is closed, syslog-ng PE automatically sends the unsent messages to the destination.

If the batch-timeout() option is enabled and the queue becomes empty, syslog-ng PE flushes the messages only if batch-timeout() expires, or the batch reaches the limit set in batch-lines().

For optimal performance, make sure that the syslog-ng PE source that feeds messages to this destination is configured properly: the value of the log-iw-size() option of the source must be higher than the batch-lines()*workers() of the destination. Otherwise, the size of the batches cannot reach the batch-lines() limit.

batch-timeout()

Type:	time [milliseconds]
Default:	-1 (disabled)

Description: Specifies the time syslog-ng PE waits for lines to accumulate in the output buffer. The syslog-ng PE application sends batches to the destinations evenly. The timer starts when the first message arrives to the buffer, so if only few messages arrive, syslog-ng PE sends messages to the destination once every batch-timeout() milliseconds at most.

body()

Type:	string or template
Default:

Description: The body of the HTTP request, for example, body("${ISODATE} ${MESSAGE}"). You can use strings, macros, and template functions in the body. If not set, it will contain the message received from the source by default.

body-prefix()

Accepted values:	string
Default:	none

Description: The string syslog-ng PE puts at the beginning of the body of the HTTP request, before the log message. Available in syslog-ng PE version 7.0.11 and later.

body-suffix()

Accepted values:	string
Default:	none

Description: The string syslog-ng PE puts to the end of the body of the HTTP request, after the log message. Available in syslog-ng PE version 7.0.11 and later.

ca-dir()

Accepted values:	directory name
Default:	none

Description: Name of a directory, that contains a set of trusted CA certificates in PEM format. The CA certificate files have to be named after the 32-bit hash of the subject's name. This naming can be created using the c_rehash utility in OpenSSL. For an example, see Configuring TLS on the syslog-ng clients. The syslog-ng PE application uses the CA certificates in this directory to validate the certificate of the peer.

An alternative way to specify this option is to put it into a tls() block, together with any other TLS options. This allows you to separate these options and ensure better readability.

Make sure that you specify TLS options either using their own dedicated option (ca-dir(), ca-file(), cert-file(), cipher-suite(), key-file(), peer-verify(), and ssl-version()), or using the tls() block and inserting the relevant options within tls(). Avoid mixing the two methods. If you do specify TLS options in both ways, the one that comes later in the configuration file will take effect.

Declaration

destination d_http {
	http(
		url("http://127.0.0.1:8080")
		tls(
			ca-dir("dir")
			ca-file("ca")
			cert-file("cert")
			cipher-suite("cipher")
			key-file("key")
			peer-verify(yes|no)
			ssl-version(<the permitted SSL/TLS version>)
		)
	);
};

ca-file()

Accepted values:	Filename
Default:	none

Description: Name of a file that contains an X.509 CA certificate (or a certificate chain) in PEM format. The syslog-ng PE application uses this certificate to validate the certificate of the HTTPS server. If the file contains a certificate chain, the file must begin with the certificate of the host, followed by the CA certificate that signed the certificate of the host, and any other signing CAs in order.

An alternative way to specify this option is to put it into a tls() block, together with any other TLS options. This allows you to separate these options and ensure better readability.

Declaration

destination d_http {
	http(
		url("http://127.0.0.1:8080")
		tls(
			ca-dir("dir")
			ca-file("ca")
			cert-file("cert")
			cipher-suite("cipher")
			key-file("key")
			peer-verify(yes|no)
			ssl-version(<the permitted SSL/TLS version>)
		)
	);
};

cert-file()

Accepted values:	Filename
Default:	none

Description: Name of a file, that contains an X.509 certificate (or a certificate chain) in PEM format, suitable as a TLS certificate, matching the private key set in the key-file() option. The syslog-ng PE application uses this certificate to authenticate the syslog-ng PE client on the destination server. If the file contains a certificate chain, the file must begin with the certificate of the host, followed by the CA certificate that signed the certificate of the host, and any other signing CAs in order.

An alternative way to specify this option is to put it into a tls() block, together with any other TLS options. This allows you to separate these options and ensure better readability.

Declaration

destination d_http {
	http(
		url("http://127.0.0.1:8080")
		tls(
			ca-dir("dir")
			ca-file("ca")
			cert-file("cert")
			cipher-suite("cipher")
			key-file("key")
			peer-verify(yes|no)
			ssl-version(<the permitted SSL/TLS version>)
		)
	);
};

cipher-suite()

Accepted values:	Name of a cipher, or a colon-separated list
Default:	Depends on the OpenSSL version that syslog-ng PE uses

Description: Specifies the cipher, hash, and key-exchange algorithms used for the encryption, for example, ECDHE-ECDSA-AES256-SHA384. The list of available algorithms depends on the version of OpenSSL used to compile syslog-ng PE. To specify multiple ciphers, separate the cipher names with a colon, and enclose the list between double-quotes, for example:

cipher-suite("ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384")

An alternative way to specify this option is to put it into a tls() block, together with any other TLS options. This allows you to separate these options and ensure better readability.

Declaration

destination d_http {
	http(
		url("http://127.0.0.1:8080")
		tls(
			ca-dir("dir")
			ca-file("ca")
			cert-file("cert")
			cipher-suite("cipher")
			key-file("key")
			peer-verify(yes|no)
			ssl-version(<the permitted SSL/TLS version>)
		)
	);
};

delimiter()

Accepted values:	string
Default:	newline character

Description: By default, syslog-ng PE separates the log messages of the batch with a newline character. You can specify a different delimiter by using the delimiter() option. Available in syslog-ng PE version 7.0.11 and later.

disk-buffer()

Description: This option enables putting outgoing messages into the disk-buffer file of the destination to avoid message loss in case of a system failure on the destination side. It has the following options:

dir()

Type:

string

Default:

N/A

Description: Defines the folder where the disk-buffer files are stored.

Note that changing the value the dir() option will not move or copy existing files from the old directory to the new one.

Caution:

When creating a new dir() option for a disk-buffer file, or modifying an existing one, make sure you delete the persist file.

syslog-ng PE creates disk-buffer files based on the path recorded in the persist file. Therefore, if the persist file is not deleted after modifying the dir() option, then following a restart, syslog-ng PE will look for or create disk-buffer files in their old location. To ensure that syslog-ng PE uses the new dir() setting, the persist file must not contain any information about the destinations which the disk-buffer file in question belongs to.

disk-buf-size()
Type:	number [bytes]
Default:
Description: This is a required option. The maximum size of the disk-buffer file in bytes. The minimum value is 1048576 bytes. If you set a smaller value, the minimum value will be used automatically. It replaces the old log-disk-fifo-size() option.

mem-buf-length()
Type:	number [messages]
Default:	10000
Description: Use this option if the option reliable() is set to no. This option contains the number of messages stored in overflow queue. It replaces the old log-fifo-size() option. It inherits the value of the global log-fifo-size() option if provided. If it is not provided, the default value is 10000 messages. Note that this option will be ignored if the option reliable() is set to yes.

mem-buf-size()
Type:	number [bytes]
Default:	163840000
Description: Use this option if the option reliable() is set to yes. This option contains the size of the messages in bytes that is used in the memory part of the disk-buffer file. It replaces the old log-fifo-size() option. It does not inherit the value of the global log-fifo-size() option, even if it is provided. Note that this option will be ignored if the option reliable() is set to no.

quot-size()
Type:	number [messages]
Default:	1000
Description: The number of messages stored in the output buffer of the destination. Note that if you change the value of this option and the disk-buffer file already exists, the change will take effect when the disk-buffer file becomes empty.

reliable()

Type:

yes|no

Default:

Description: If set to yes, syslog-ng PE cannot lose logs in case of reload/restart, unreachable destination or syslog-ng PE crash. This solution provides a slower, but reliable disk-buffer option. It is created and initialized at startup and gradually grows as new messages arrive. If set to no, the normal disk-buffer option will be used. This provides a faster, but less reliable disk-buffer option.

Caution: Hazard of data loss!

If you change the value of reliable() option when there are messages in the disk-buffer file, the messages stored in the disk-buffer file will be lost.

truncate-size-ratio()

Type:

number (for percentage) between 0 and 1

Default:

0.1 (10%)

Description: Limits the truncation of the disk-buffer file. Truncating the disk-buffer file can slow down disk I/O operations, but it saves disk space. As a result, syslog-ng PE only truncates the file if the possible disk gain is more than truncate-size-ratio() times disk-buf-size().

Caution:

One Identity recommends that you do not modify the value of the truncate-size-ratio() option unless you are fully aware of the potential performance implications.

Example: Examples for using disk-buffer()

In the following case, reliable disk-buffer() is used.

destination d_demo {
    network("127.0.0.1"
        port(3333)
        disk-buffer(
            mem-buf-size(10000)
            disk-buf-size(2000000)
            reliable(yes)
            dir("/tmp/disk-buffer")
        )
    );
};

In the following case normal disk-buffer() is used.

destination d_demo {
    network("127.0.0.1"
        port(3333)
        disk-buffer(
            mem-buf-length(10000)
            disk-buf-size(2000000)
            reliable(no)
            dir("/tmp/disk-buffer")
        )
    );
};

headers()

Type:	string list
Default:

Description: Custom HTTP headers to include in the request, for example, headers("HEADER1: header1", "HEADER2: header2"). If not set, only the default headers are included, but no custom headers.

The following headers are included by default:

X-Syslog-Host: <host>
X-Syslog-Program: <program>
X-Syslog-Facility: <facility>
X-Syslog-Level: <loglevel/priority>

hook-commands()

Description: This option allows running external programs when the relevant driver is initialized or torn down. The hook-commands() can be used with all source and destination drivers with the exception of the usertty() and internal() drivers.

NOTE: The syslog-ng PE application must be able to start and restart the external program, and have the necessary permissions to do so. For example, if your host is running AppArmor or SELinux, you might have to modify your AppArmor or SELinux configuration to enable syslog-ng PE to execute external applications.

Using the hook-commands() when syslog-ng PE starts or stops

To run an external program when syslog-ng PE starts or stops, use the following options:

startup()
Type:	string
Default:	N/A
Description: Defines the external program that is run when syslog-ng PE starts.

shutdown()
Type:	string
Default:	N/A
Description: Defines the external program that is executed when syslog-ng PE stops.

Using the hook-commands() when syslog-ng PE reloads

To run an external program when the syslog-ng PE configuration is initiated or torn down (for example, on startup/shutdown or during a syslog-ng PE reload), use the following options:

setup()
Type:	string
Default:	N/A
Description: Defines an external program that is run when the syslog-ng PE configuration is initiated, for example, on startup or during a syslog-ng PE reload.

teardown()
Type:	string
Default:	N/A
Description: Defines an external program that is run when the syslog-ng PE configuration is stopped or torn down, for example, on shutdown or during a syslog-ng PE reload.

Example: Using the hook-commands() with a network source

In the following example, the hook-commands() is used with the network() driver and it opens an iptables port automatically when syslog-ng PE is started/stopped.

The assumption in this example is that the LOGCHAIN chain is part of a larger ruleset that routes traffic to it. Whenever the syslog-ng PE created rule is there, packets can flow (otherwise the port is closed).

source {
  network(transport(udp)
    hook-commands(
      startup("iptables -I LOGCHAIN 1 -p udp --dport 514 -j ACCEPT")
shutdown("iptables -D LOGCHAIN 1")
    ;)
  );
};

key-file()

Accepted values:	Filename
Default:	none

Description: Path and name of a file that contains a private key in PEM format, suitable as a TLS key. If properly configured, the syslog-ng PE application uses this private key and the matching certificate (set in the cert-file() option) to authenticate the syslog-ng PE client on the destination server.

The sentinel() destination supports only unencrypted key files (that is, the private key cannot be password-protected).

An alternative way to specify this option is to put it into a tls() block, together with any other TLS options. This allows you to separate these options and ensure better readability.

Declaration

destination d_http {
	http(
		url("http://127.0.0.1:8080")
		tls(
			ca-dir("dir")
			ca-file("ca")
			cert-file("cert")
			cipher-suite("cipher")
			key-file("key")
			peer-verify(yes|no)
			ssl-version(<the permitted SSL/TLS version>)
		)
	);
};

log-fifo-size()

Type:	number
Default:	Use global setting.

Description: The number of messages that the output queue can store.

log-type()

Type:	Microsoft Azure Sentinel parameter and an optional syslog-ng PE configuration option
Default:	Syslog_CL for syslog-ng PE

Description:

On the Microsoft Azure Sentinel user interface, you can filter log events by referring to log-type parameters. Although the log-type parameters query information with their custom query language (namely, Kusto), they are essentially table fields in a database.

The log-type parameter is mandatory for the Microsoft Azure Sentinel HTTP Data Collector API interface, and for syslog-ng Premium Edition, its default value is Syslog_CL.

NOTE: While Microsoft Azure Sentinel accepts log events from external sources, it also has built-in log types. To differentiate external and built-in log types, Azure Sentinel automatically applies the Custom Log-type (_CL) suffix to log events that originate from external sources. Although the log-type parameter is optional (unlike workspace-id and auth-secret, which are mandatory), keep in mind that Microsoft Azure Sentinel will automatically attach the _CL suffix to all log events originating from external sources. For example, log events that originate from syslog-ng PE will be named Syslog_CL by default.

For more information, see Getting the required credentials to configure syslog-ng PE as a Data Connector for Microsoft Azure Sentinel and Log types.

method()

Type:	POST \| PUT
Default:	POST

Description: Specifies the HTTP method to use when sending the message to the server.

password()

Type:	string
Default:

Description: The password that syslog-ng PE uses to authenticate on the server where it sends the messages.

peer-verify()

Accepted values:	yes \| no
Default:	yes

Description: Verification method of the peer. The following table summarizes the possible options and their results depending on the certificate of the peer.

		The remote peer has:
		no certificate	invalid certificate	valid certificate
Local peer-verify() setting	no (optional-untrusted)	TLS-encryption	TLS-encryption	TLS-encryption
Local peer-verify() setting	yes (required-trusted)	rejected connection	rejected connection	TLS-encryption

For untrusted certificates only the existence of the certificate is checked, but it does not have to be valid — syslog-ng accepts the certificate even if it is expired, signed by an unknown CA, or its CN and the name of the machine mismatches.

Caution:

When validating a certificate, the entire certificate chain must be valid, including the CA certificate. If any certificate of the chain is invalid, syslog-ng PE will reject the connection.

persist-name()

Type:	string
Default:	None

Description:If you receive the following error message during syslog-ng PE startup, set the persist-name() option of the duplicate drivers:

Error checking the uniqueness of the persist names, please override it with persist-name option. Shutting down.

This error occurs if you use identical drivers in multiple sources, for example, if you configure two file sources to read from the same file. In this case, set the persist-name() of the drivers to a custom string, for example, persist-name("example-persist-name1").

proxy()

Type:	The proxy server address, in proxy("PROXY_IP:PORT") format. For example, proxy("http://myproxy:3128")
Default:	None

Description:

The proxy() option enables you to configure the sentinel driver to use a specific HTTP proxy for all HTTP-based destinations, instead of using the proxy that is configured for the system.

If you do not set the proxy() option, the sentinel driver uses the http_proxy and https_proxy environment variables, as shown in CURLOPT_PROXY explained.

NOTE: Configuring the proxy() option overwrites the default http_proxy and https_proxy environment variables.

retries()

Type:	number [of attempts]
Default:	3

Description: The number of times syslog-ng PE attempts to send a message to this destination. If syslog-ng PE could not send a message, it will try again until the number of attempts reaches retries(), then drops the message.

To handle HTTP error responses, if the HTTP server returns 5xx codes, syslog-ng PE will attempt to resend messages until the number of attempts reaches retries. If the HTTP server returns 4xx codes, syslog-ng PE will drop the messages.

ssl-version()

Type:	string
Default:	None, uses the libcurl default

Description: Specifies the permitted SSL/TLS version. Possible values: sslv2, sslv3, tlsv1, tlsv1_0, tlsv1_1, tlsv1_2, tlsv1_3.

An alternative way to specify this option is to put it into a tls() block, together with any other TLS options. This allows you to separate these options and ensure better readability.

Declaration

destination d_http {
	http(
		url("http://127.0.0.1:8080")
		tls(
			ca-dir("dir")
			ca-file("ca")
			cert-file("cert")
			cipher-suite("cipher")
			key-file("key")
			peer-verify(yes|no)
			ssl-version(<the permitted SSL/TLS version>)
		)
	);
};

template()

Type:	string
Default:	A format conforming to the default logfile format.

Description: Specifies a template defining the logformat to be used in the destination. Macros are described in Macros of syslog-ng PE. Please note that for network destinations it might not be appropriate to change the template as it changes the on-wire format of the syslog protocol which might not be tolerated by stock syslog receivers (like syslogd or syslog-ng itself). For network destinations make sure the receiver can cope with the custom format defined.

throttle()

Type:	number
Default:	0

Description: Sets the maximum number of messages sent to the destination per second. Use this output-rate-limiting functionality only when using the disk-buffer option as well to avoid the risk of losing messages. Specifying 0 or a lower value sets the output limit to unlimited.

timeout()

Type:	number [seconds]
Default:	0

Description: The value (in seconds) to wait for an operation to complete, and attempt to reconnect the server if exceeded. By default, the timeout value is 0, meaning that there is no timeout. Available in version 7.0.4 and later.

url()

Type:	URL or list of URLs
Default:	http://localhost/

Description: Specifies the hostname or IP address, and optionally the port number of the web service that can receive log data through HTTP. Use a colon (:) after the address to specify the port number of the server. For example: http://127.0.0.1:8000

In case the server on the specified URL returns a redirect request, syslog-ng PE automatically follows maximum 3 redirects. Only HTTP-based and HTTPS-based redirections are supported.

Starting with version 7.0.12, you can specify multiple URLs, for example, url("site1" "site2"). In this case, syslog-ng PE sends log messages to the specified URLs in a load-balance fashion. This means that syslog-ng PE sends each message to only one URL. For example, you can use this to send the messages to a set of ingestion nodes or indexers of your SIEM solution if a single node cannot handle the load. Note that the order of the messages as they arrive on the servers can differ from the order syslog-ng PE has received them, so use load-balancing only if your server can use the timestamp from the messages. If the server uses the timestamp when it receives the messages, the order of the messages will be incorrect.

Caution:

If you set multiple URLs in the url() option, set the persist-name() option as well to avoid data loss.

user-agent()

Type:	string
Default:	syslog-ng [version]/libcurl[version]

Description: The value of the USER-AGENT header in the messages sent to the server.

user()

Type:	string
Default:

Description: The username that syslog-ng PE uses to authenticate on the server where it sends the messages.

use-system-cert-store()

Type:	yes \| no
Default:	no

Description: Use the certificate store of the system for verifying HTTPS certificates. For details, see the curl documentation.

workers()

Type:	integer
Default:	1

Description: Specifies the number of worker threads (at least 1) that syslog-ng PE uses to send messages to the server. Increasing the number of worker threads can drastically improve the performance of the destination.

Caution:

Hazard of data loss!

When you use more than one worker threads together with the disk-buffer option, syslog-ng PE creates a separate disk-buffer file for each worker thread. This means that decreasing the number of workers can result in losing data currently stored in the disk-buffer files. Do not decrease the number of workers when the disk-buffer files are in use.

If you are using load-balancing (that is, you have configured multiple servers in the url() option), increase the number of worker threads at least to the number of servers. For example, if you have set three URLs (url("site1" "site2" "site3")), set the workers() option to 3 or more.

workspace-id()

Type:	Provided by Microsoft: unique hexadecimal number, identifying your Sentinel instance. On the syslog-ng PE side, it is handled as string.
Default:	N/A

For more information, see Getting the required credentials to configure syslog-ng PE as a Data Connector for Microsoft Azure Sentinel.

snmp: Sending SNMP traps

Sending and storing log messages — destinations and destination drivers > snmp: Sending SNMP traps

The snmp() driver sends SNMP traps using the Simple Network Management Protocol version 2c or version 3. Incoming log messages can be converted to SNMP traps, as the fields of the SNMP messages can be customized using syslog-ng PE macros.

The snmp() driver is available in syslog-ng PE version 7.0.20 and later.

NOTE: The snmp destination driver currently supports sending SNMP traps only using the UDP transport protocol.

The snmp() driver requires the host(), trap-obj(), and snmp-obj() options to be set, as well as the engine-id() and version() options when using the SNMPv3 protocol. For the list of available optional parameters, see snmp() destination options.

NOTE:To use the snmp() driver, the scl.conf file must be included in your syslog-ng PE configuration:

@include "scl.conf"

Declaration

destination d_snmp {snmp(host() trap-obj() snmp-obj() ...);};

Caution:

If syslog-ng PE cannot resolve the destination hostname during startup, it will try to resolve the hostname again when the next message to be sent as an SNMP trap is received. However, if this name resolution fails, the trap will be dropped.

NOTE: The snmp() destination driver does not generate MARK signals itself, but can receive and forward MARK signals.

Example: Using the snmp() destination driver

The following example defines an SNMP destination that uses the SNMPv2c protocol.

destination d_snmpv2c{
    snmp(
        version('v2c')
        host('192.168.1.1')
        trap-obj('.1.3.6.1.6.3.1.1.4.1.0', 'Objectid', '.1.3.6.1.4.1.18372.3.1.1.1.2.1')
        snmp-obj('.1.3.6.1.4.1.18372.3.1.1.1.1.1.0', 'Octetstring', 'Test SNMP trap')
        snmp-obj('.1.3.6.1.4.1.18372.3.1.1.1.1.2.0', 'Octetstring', 'admin')
        snmp-obj('.1.3.6.1.4.1.18372.3.1.1.1.1.3.0', 'Ipaddress', '192.168.1.1')
        );
};

The following example defines an SNMP destination that uses the SNMPv3 protocol and uses macros to fill the values of the SNMP objects.

destination d_snmpv3{
    snmp(
        version('v3')
        host('192.168.1.1')
        port(162)
        engine-id('0xdeadbeefde')
        auth-username('myusername')
        auth-password('password')
        enc-algorithm('AES')
        enc-password('password')
        trap-obj('.1.3.6.1.6.3.1.1.4.1.0', 'Objectid', '.1.3.6.1.4.1.18372.3.1.1.1.2.1')
        snmp-obj('.1.3.6.1.4.1.18372.3.1.1.1.1.1', 'Octetstring', '${MESSAGE}')
        snmp-obj('.1.3.6.1.4.1.18372.3.1.1.1.1.2', 'Octetstring', 'admin')
        snmp-obj('.1.3.6.1.4.1.18372.3.1.1.1.1.3', 'Ipaddress', '${SOURCEIP}')
        );
};

snmp() destination options

Sending and storing log messages — destinations and destination drivers > snmp: Sending SNMP traps > snmp() destination options

This driver sends SNMP traps using the SNMP v2c or v3 protocol.

The snmp() destination has the following options:

auth-algorithm()

Type:	SHA\|sha
Default:	SHA

Description: The authentication method to use. Lowercase values (for example, sha) can be used as well.

This option is used with the SNMPv3 protocol.

auth-password()

Type:	string
Default:	empty string

Description: The password used for authentication. If the auth-username() option is set but the auth-password() is empty, syslog-ng PE will try to authenticate with an empty password.

This option is used with the SNMPv3 protocol.

auth-username()

Type:	string
Default:	empty string

Description: The username used to authenticate on the SNMP server. If this parameter is set, syslog-ng PE will try to authenticate on the SNMP server.

This option is used with the SNMPv3 protocol.

community()

Type:	string
Default:	public

Description: The community string used for SNMPv2c authentication.

This option is used with the SNMPv2c protocol.

enc-algorithm()

Type:	AES\|aes
Default:	AES

Description: The encryption method used to encrypt the SNMP traffic. Lowercase values (for example, aes) can be used as well.

This option is used with the SNMPv3 protocol.

enc-password()

Type:	string
Default:

Description: The password used for the encryption. Encryption is used only if the enc-password() is not empty.

This option is used with the SNMPv3 protocol.

engine-id()

Type:	number (hexadecimal number)
Default:

Description: The engine ID is a hexadecimal number between 5 and 32 characters long, starting with 0x. for example, 0xABABABABAB.

This option is a required parameter when using the SNMPv3 protocol.

host()

Type:	hostname or IP address
Default:	n/a

Description: Hostname of the SNMP server.

log-fifo-size()

Type:	number
Default:	Use global setting.

Description: The number of messages that the output queue can store.

port()

Type:	number (port number)
Default:	162

Description: The port number to connect to.

snmp-obj()

Type:	<oid_of_the_object>, <type_of_the_object>, <value_of_the_object>
Default:	n/a

Description: The snmp-obj() option can be used to create custom SNMP trap elements. To create a trap element, specify the OID, type, and value of the element in the snmp-obj() option. To send SNMP traps, at least one snmp-obj() option must be defined. The snmp-obj() option requires the following parameters. Note that syslog-ng PE does not validate the values of these elements.

<oid_of_the_object>: The object id of the SNMP object, for example, .1.3.6.1.4.1.18372.3.1.1.1.1.1.
<type_of_the_object>: The type of the object specified as an ASN.1 primitive. One of: Integer, Timeticks, Octetstring, Counter32, Ipaddress, Objectid. The type names are not case sensitive.
<value_of_the_object>: The value of the object as a string. The macros of syslog-ng PE can be used to set these values, making it possible to transfer the content and other metadata from the the syslog message to the SNMP trap. Note that if the value of an Integer, Counter32 or Timeticks object is not a number (for example, is an empty string or other not-number string), syslog-ng PE will automatically replace the value with 0. The values of other types of objects are not validated.

Example: Defining SNMP objects

The following are SNMP object definitions:

snmp-obj('.1.3.6.1.4.1.18372.3.1.1.1.1.3', 'Ipaddress', '192.168.1.1')

snmp-obj('.1.3.6.1.4.1.18372.3.1.1.1.1.2', 'Octetstring', '${MESSAGE}')

time-zone()

Type:	name of the timezone, or the timezone offset
Default:	unspecified

Description: Convert timestamps to the timezone specified by this option. If this option is not set, then the original timezone information in the message is used. Converting the timezone changes the values of all date-related macros derived from the timestamp, for example, HOUR. For the complete list of such macros, see Date-related macros.

The timezone can be specified as using the name of the (for example, time-zone("Europe/Budapest")), or as the timezone offset in +/-HH:MM format (for example, +01:00). On Linux and UNIX platforms, the valid timezone names are listed under the /usr/share/zoneinfo directory.

trap-obj()

Type:	<oid_of_the_object>, "Objectid", <value_of_the_object>
Default:	n/a

Description: The trap-obj() is a specialized version of the snmp-obj() option that is used to identify the SNMP trap object. The type of the trap object is always Objectid. The <oid_of_the_object> and the <value_of_the_object> parameters are identical to the respective parameters of the snmp-obj() option. For details on these parameters, see snmp-obj().

NOTE: Using the trap-obj() object is equivalent to using the snmp-obj() with the Objectid type.

version()

Type:	v2c\|v3
Default:	v2c

Description: Specifies which version of the SNMP protocol to use.

NOTE: The syslog-ng PE application will accept any valid option for the snmp() destination, but will only use the ones relevant to the selected protocol version, any other option will be ignored. For example, if the version("v2c") engine-id("0xABABABABAB") community("mycommunity") options are set, syslog-ng PE will accept every option, but process only the community() option, because engine-id() applies only to SNMPv3.

smtp: Generating SMTP messages (email) from logs

Sending and storing log messages — destinations and destination drivers > smtp: Generating SMTP messages (email) from logs

The destination is aimed at a fully controlled local, or near-local, trusted SMTP server. The goal is to send mail to trusted recipients, through a controlled channel. It hands mails over to an SMTP server, and that is all it does, therefore the resulting solution is as reliable as sending an email in general. For example, syslog-ng PE does not verify whether the recipient exists.

The smtp() driver sends email messages triggered by log messages. The smtp() driver uses SMTP, without needing external applications. You can customize the main fields of the email, add extra headers, send the email to multiple recipients, and so on.

The subject(), body(), and header() fields may include macros which get expanded in the email. For more information on available macros see Macros of syslog-ng PE.

The smtp() driver has the following required parameters: host(), port(), from(), to(), subject(), and body(). For the list of available optional parameters, see smtp() destination options.

NOTE: To use this destination, syslog-ng Premium Edition (syslog-ng PE) must run in server mode. Typically, only the central syslog-ng PE server uses this destination. For more information on the server mode, see Server mode.

NOTE: The smtp() destination driver is available only in 5 F2 and later.

Declaration

smtp(host() port() from() to() subject() body() options());

Example: Using the smtp() driver

The following example defines an smtp() destination using only the required parameters.

destination d_smtp {
    smtp(
        host("localhost")
        port(25)
        from("syslog-ng alert service" "noreply@example.com")
        to("Admin #1" "admin1@example.com")
        subject("[ALERT] Important log message of $LEVEL condition received from $HOST/$PROGRAM!")
        body("Hi!\nThe syslog-ng alerting service detected the following important log message:\n $MSG\n-- \nsyslog-ng\n")
    );
};

The following example sets some optional parameters as well.

destination d_smtp {
    smtp(
        host("localhost")
        port(25)
        from("syslog-ng alert service" "noreply@example.com")
        to("Admin #1" "admin1@example.com")
        to("Admin #2" "admin2@example.com")
        cc("Admin BOSS" "admin.boss@example.com")
        bcc("Blind CC" "blindcc@example.com")
        subject("[ALERT] Important log message of $LEVEL condition received from $HOST/$PROGRAM!")
        body("Hi!\nThe syslog-ng alerting service detected the following important log message:\n $MSG\n-- \nsyslog-ng\n")
        header("X-Program", "$PROGRAM")
    );
};

Example: Simple email alerting with the smtp() driver

The following example sends an email alert if the eth0 network interface of the host is down.

filter f_linkdown {
    match("eth0: link down" value("MESSAGE"));
};
destination d_alert {
    smtp(
        host("localhost") port(25)
        from("syslog-ng alert service" "syslog@localhost")
        reply-to("Admins" "root@localhost")
        to("Ennekem" "me@localhost")
        subject("[SYSLOG ALERT]: eth0 link down")
        body("Syslog received an alert:\n$MSG")
    );
};

log {
    source(s_local);
    filter(f_linkdown);
    destination(d_alert);
};

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syslog-ng Premium Edition 7.0.34 - Administration Guide

sentinel() destination options

auth-secret()

batch-bytes()

batch-lines()

batch-timeout()

body()

body-prefix()

body-suffix()

ca-dir()

Declaration

ca-file()

Declaration

cert-file()

Declaration

cipher-suite()

Declaration

delimiter()

disk-buffer()

Example: Examples for using disk-buffer()

headers()

hook-commands()

Using the hook-commands() when syslog-ng PE starts or stops

Using the hook-commands() when syslog-ng PE reloads

Example: Using the hook-commands() with a network source

key-file()

Declaration

log-fifo-size()

log-type()

method()

password()

peer-verify()

persist-name()

proxy()

retries()

ssl-version()

Declaration

template()

throttle()

timeout()

url()

user-agent()

user()

use-system-cert-store()

workers()

workspace-id()

snmp: Sending SNMP traps

Declaration

Example: Using the snmp() destination driver

snmp() destination options

auth-algorithm()

auth-password()

auth-username()

community()

enc-algorithm()

enc-password()

engine-id()

host()

log-fifo-size()

port()

snmp-obj()

Example: Defining SNMP objects

time-zone()

trap-obj()

version()

smtp: Generating SMTP messages (email) from logs

Declaration

Example: Using the smtp() driver

Example: Simple email alerting with the smtp() driver