The systemd-syslog() driver has the following options:
Description: This option makes it possible to execute 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 OSE 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 OSE to execute external applications.
To execute an external program when syslog-ng OSE starts or stops, use the following options:
startup() | |
Type: | string |
Default: | N/A |
Description: Defines the external program that is executed as syslog-ng OSE starts. |
shutdown() | |
Type: | string |
Default: | N/A |
Description: Defines the external program that is executed as syslog-ng OSE stops. |
To execute an external program when the syslog-ng OSE configuration is initiated or torn down, for example, on startup/shutdown or during a syslog-ng OSE reload, use the following options:
setup() | |
Type: | string |
Default: | N/A |
Description: Defines an external program that is executed when the syslog-ng OSE configuration is initiated, for example, on startup or during a syslog-ng OSE reload. |
teardown() | |
Type: | string |
Default: | N/A |
Description: Defines an external program that is executed when the syslog-ng OSE configuration is stopped or torn down, for example, on shutdown or during a syslog-ng OSE reload. |
In the following example, the hook-commands() is used with the network() driver and it opens an iptables port automatically as syslog-ng OSE 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 OSE 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") ) ); };
The tcp(), tcp6(), udp(), and udp6() drivers are obsolete. Use the network() source and the network() destination instead. For details, see network: Collecting messages using the RFC3164 protocol (network() driver) and network: Sending messages to a remote log server using the RFC3164 protocol (network() driver), respectively.
The tcp(), tcp6(), udp(), udp6() drivers can receive syslog messages conforming to RFC3164 from the network using the TCP and UDP networking protocols. The tcp6() and udp6() drivers use the IPv6 network protocol, while tcp() and udp() use IPv4.
To convert your existing tcp(), tcp6(), udp(), udp6() source drivers to use the network() driver, see Change an old source driver to the network() driver.
The tcp(), tcp6(), udp(), and udp6() drivers are obsolete. Use the network() source and the network() destination instead. For details, see network: Collecting messages using the RFC3164 protocol (network() driver) and network: Sending messages to a remote log server using the RFC3164 protocol (network() driver), respectively.
To convert your existing tcp(), tcp6(), udp(), udp6() source drivers to use the network() driver, see Change an old source driver to the network() driver.
To replace your existing tcp(), tcp6(), udp(), udp6() sources with a network() source, complete the following steps.
Replace the driver with network. For example, replace udp( with network(
Set the transport protocol.
If you used TLS-encryption, add the transport("tls") option, then continue with the next step.
If you used the tcp or tcp6 driver, add the transport("tcp") option.
If you used the udp or udp driver, add the transport("udp") option.
If you use IPv6 (that is, the udp6 or tcp6 driver), add the ip-protocol(6) option.
If you did not specify the port used in the old driver, check network() source options and verify that your clients send the messages to the default port of the transport protocol you use. Otherwise, set the appropriate port number in your source using the port() option.
All other options are identical. Test your configuration with the syslog-ng --syntax-only command.
The following configuration shows a simple tcp source.
source s_old_tcp { tcp( ip(127.0.0.1) port(1999) tls( peer-verify("required-trusted") key-file("/opt/syslog-ng/etc/syslog-ng/syslog-ng.key") cert-file('/opt/syslog-ng/etc/syslog-ng/syslog-ng.crt') ) ); };
When replaced with the network() driver, it looks like this.
source s_new_network_tcp { network( transport("tls") ip(127.0.0.1) port(1999) tls( peer-verify("required-trusted") key-file("/opt/syslog-ng/etc/syslog-ng/syslog-ng.key") cert-file('/opt/syslog-ng/etc/syslog-ng/syslog-ng.crt') ) ); };
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