Syslog ng

Author: g | 2025-04-24

Jun 22 DiskStation syslog-ng[ ]: syslog-ng shutting down; version='3.5.5' Jun 22 DiskStation syslog-ng[ ]: syslog-ng starting up;

GitHub - syslog-ng/syslog-ng: syslog-ng is an enhanced log

Syslog-ng© is the world’s most flexible and scalable audit trail processing tool for organizations of any size. It provides a centralised, securely stored log of all devices on your network, whatever platform they run on. And syslog-ng also incorporates a host of powerful features, including filtering based on message content, as well as customisable data mining and analysis capabilities. By default, syslog-ng stores its message in a plain text file under /var/log. Although text file allows easy and quick viewing, a sql database allows more flexibility. Thus, we will integrate syslog-ng with MySQL while retaining the text file for quick diagnosis when we log into the console.Here are the web interface tools which does exactly this php-syslog-ng CLphp-syslog-ng is a front-end for viewing syslog-ng messages logged to MySQL. It lets you quickly and easily manage logs from many hosts. It features customized searches based on host, facility, priority, date/time, and the content of the log messages. It also has a tail mode, with customized filters, that enables you to monitor your systems in near real time.Downloads and Documentation is a front-end for viewing syslog-ng messages logged to MySQL in real-time. It features customized searches based on device, time, priority, message, and date.Downloads and Documentation Front-End written in Perl to allow easy access to messages received by a syslog-ng server, with extra features such as device groups and access control based on user profiles.Downloads and Documentation is a enterprise class Network Monitoring System, Powered by Nagios, WebMIN, RRDtool, Nmap, Fping, Net::SNMP, Syslog-NG and other open source software providing web-based administration, and enhanced web portal to help you manage your network.Downloads and Documentation Link

GitHub - syslog-ng/syslog-ng: syslog-ng is an enhanced log daemon

Until now collecting logs behind proxies or load balancers needed some compromises. You either trusted the host information included in the log messages or you could only see the proxy as the sender host. Starting with syslog-ng 3.30 there is a third option available: using the PROXY protocol. While not an official Internet standard, it is supported by a number of popular software, like HAProxy. Other software can be extended to use it, like F5 load balancers using iRules. This way crucial information about the original network connection is not lost, but it is forwarded to the server by the proxy.From this blog you can learn about the PROXY protocol, how to enable it in the syslog-ng configuration, and how to send test messages using loggen directly and through HAProxy.Before you beginYou need to use at least sylog-ng version 3.30 (or syslog-ng PE 7.0.23 of the commercial version) to utilize PROXY protocol support. Most Linux distributions still carry older versions. You can find information about unofficial 3rd party syslog-ng repositories with up-to-date syslog-ng packages at At the moment these versions are not yet released, so I used git snapshot packages for testing.In my blog I will show you a simple configuration for HAProxy, as it is available for free and it is included in most Linux distributions. I ran my tests on three openSUSE virtual machines separately for the client sending logs, for HAProxy and for the syslog-ng server. But you can use any platform that HAProxy and syslog-ng supports and can actually have all three on a single host.Before we take a deep dive into syslog-ng configuration, let’s take a closer look at the PROXY protocol. The PROXY protocol was created by HAProxy developers and it is available on their website: While it resembles an RFC, it is not

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Restart syslog-ng service after your changes in the config file.Logs are placed to the directory /var/log/firewalls. Check a content of the directory with the command:# ls -l /var/log/firewalls/total 8drwxr-x--- 3 ubuntu ubuntu 4096 Dec 8 20:16 192.168.0.1drwxr-x--- 3 ubuntu ubuntu 4096 Dec 8 20:18 192.168.0.2As you can see they are two directories 192.168.0.1 and 192.168.0.2 that were automatically created by syslog-ng based on the IP addresses of the devices we are collecting logs from. Picture 3 - Testing TopologyOur configuration file tells syslog-ng to create a directory structure based on the IP_of_device/year/month for each contributing device. For each day a log file is created inside the IP/year/month directory. Let's inspect a log file of a router 192.168.0.1.# cat /var/log/firewalls/192.168.0.11/2016/12/192.168.0.1-2016-12-08.logDec 8 20:16:45 192.168.0.1 : %SYS-5-CONFIG_I: Configured from console by consoleDec 8 21:14:21 192.168.0.1 : %SYS-5-CONFIG_I: Configured from console by consoleDec 8 21:15:33 192.168.0.1 : %LINK-5-CHANGED: Interface GigabitEthernet1/0, changed state to administratively downDec 8 21:15:34 192.168.0.1 : %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0, changed state to downDec 8 21:17:28 192.168.0.1 : %SYS-5-CONFIG_I: Configured from console by consoleDec 8 21:22:32 192.168.0.1 : %LINK-3-UPDOWN: Interface GigabitEthernet1/0, changed state to upDec 8 21:22:34 192.168.0.1 : %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0, changed state to up5. Configuring Network Device R1 to Send Traps to Syslog-ng5.1 Cisco IOSThese two commands configure a Cisco router for sending logs with a priority 5 (notification) to a syslog server with IP address 192.168.0.100.R1(config)# logging trap notificationsR1(config)# logging host 192.168.0.1005.2 VyOSvyos@R1:~$ configure[edit]vyos@R1# set system syslog host 192.168.0.100 facility all level 'notice'vyos@R1# set system syslog host 192.168.0.100 port '514'. Jun 22 DiskStation syslog-ng[ ]: syslog-ng shutting down; version='3.5.5' Jun 22 DiskStation syslog-ng[ ]: syslog-ng starting up; PHP-Syslog-NG Opensource GUI front-end to Syslog-ng. Syslog-NG Opensource Next Generation Syslog server . Complete Definition . Syslog is a valuable mechanism to

Test syslog-ng on EPEL 10! - Blog - syslog-ng Community - syslog-ng

Some time ago I was asked by my friend to recommend a cost-free solution that he could use for storing logs of his security device over network. The Linux OS with installed syslog-ng is perfectly suitable for this job because it can collect logs from any source, process them in near real-time and deliver them to a wide variety of destinations. However it was challenge to explain all the steps in an easy manner as he was a total newbie in a Linux world. For this reason I wrote a basic installation and configuration manual for him which I share with you. The manual helps you to setup syslog-ng on Ubuntu server and troubleshoot the possible issues.1. Install Ubuntu 16.04 Server EditionDuring Ubuntu installation you are asked to provide the username/password and IP settings. Once an installation process finishes, the system is rebooted. when you get your console again, login and install updates with the command:$ sudo su# apt-get update# apt-get upgrade2. Install and Configure Syslog-ng# apt-get install syslog-ngFirst, you need to download a simple configuration file that I created for you. Change the username ubuntu inside the file to your username. Type the command whoami to get username.# cd /etc/syslog-ng/conf.d# wget -O firewals.conf# service syslog-ng restart3. Static IP Address ConfigurationYou probably need to configure a static IP address for the interface. Find the name of our Ethernet interface with the ifconfig command. Then edit the file /etc/network/interfaces with nano or vim editor and configure IP settings. Below is an example of static IP configuration for the interface ens3.Picture 1 - Static IP Address ConfigurationRestart a network service with a command:# service networking restart4. TroubleshootingThe Syslog-ng service should listen on all IP address and TCP and UDP port 514.# netstat -tulpn | grep 514Picture 2 - TCP/UDP Port 514 Opened by Syslog-ng ServiceIf you want the syslog-ng to listen on a particular IP address instead of all IP addresses, replace the IP address 0.0.0.0 with the desired IP address in the configuration file /etc/syslog-ng/conf.d/firewals.conf. You can also change the owner of the saved log files there. Do not forget to

What syslog-ng OSE is - syslog-ng documentation

This source: PROXIED_SRCPORT, PROXIED_SRCIP, PROXIED_IP_VERSION, PROXIED_DSTPORT and PROXIED_DSTIP. Note that these name-value pairs are not created with PROXY UNKNOWN.Finally, the log statement connects the source and destination into a pipeline together. Reload syslog-ng for the new configuration to take effect.Testing with loggenThe easiest way to test the above configuration is to use the loggen utility of syslog-ng. First try to send a few logs without enabling PROXY protocol support:loggen -i -S localhost 7777You will not find any new log messages in the new file destination. However, /var/log/messages will contain messages similar to these (if logging of the internal() source is enabled):Nov 6 16:16:07 localhost syslog-ng[891]: PROXY proto header with invalid header length; max_parsable_length='216', max_length_by_spec='108', length='255', header='2020-11-06T16:16:07 localhost prg00000[1234]: seq: 0000000000, thread: 0000, runid: 1604675767, stamp: 2020-11-06T16:16:07 PADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADD\x0a2020-11-06T16:16:07 localhost prg00000[1234]: seq: 0000000001, thread: 0000, runid: 1604675767, stamp: 2020-11-06T16:16:07 [...] PADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADD\x0a-client.c'Nov 6 16:16:07 localhost syslog-ng[891]: Error parsing PROXY protocol header;Nov 6 16:16:07 localhost syslog-ng[891]: Syslog connection closed; fd='16', client='AF_INET(127.0.0.1:41066)', local='AF_INET(0.0.0.0:7777)'It means that loggen did not use the PROXY header and thus the connection was rejected. Let’s try again, this time using the new -H option of loggen:loggen -i -S -H localhost 7777This time /var/log/messages show a successful connection:Nov 6 16:37:25 localhost syslog-ng[891]: Initializing PROXY protocol source driver; driver='0x560b2fb9b310'Nov 6 16:37:25 localhost syslog-ng[891]: Syslog connection accepted; fd='16', client='AF_INET(127.0.0.1:41068)', local='AF_INET(0.0.0.0:7777)'Nov 6 16:37:25 localhost syslog-ng[891]: PROXY protocol header parsed successfully;Nov 6 16:37:29 localhost syslog-ng[891]: Syslog connection closed; fd='16', client='AF_INET(127.0.0.1:41068)', local='AF_INET(0.0.0.0:7777)'And in /var/log/pp.log you will find similar messages:{"SOURCE":"s_tcp_pp","PROXIED_SRCPORT":"7075","PROXIED_SRCIP":"192.168.1.48","PROXIED_IP_VERSION":"4","PROXIED_DSTPORT":"514","PROXIED_DSTIP":"192.168.1.47","PROGRAM":"prg00000","PID":"1234","MESSAGE":"seq: 0000003961, thread: 0000, runid: 1604677045, stamp: 2020-11-06T16:37:29 PADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADD","LEGACY_MSGHDR":"prg00000[1234]: ","HOST_FROM":"127.0.0.1","HOST":"localhost"}{"SOURCE":"s_tcp_pp","PROXIED_SRCPORT":"7075","PROXIED_SRCIP":"192.168.1.48","PROXIED_IP_VERSION":"4","PROXIED_DSTPORT":"514","PROXIED_DSTIP":"192.168.1.47","PROGRAM":"prg00000","PID":"1234","MESSAGE":"seq: 0000003962, thread: 0000, runid: 1604677045, stamp: 2020-11-06T16:37:29 PADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADDPADD","LEGACY_MSGHDR":"prg00000[1234]: ","HOST_FROM":"127.0.0.1","HOST":"localhost"}The PROXY protocol related name-value pairs contain random IP addresses and ports by default, but you can specify your own values as well if you want to test your configuration with specific values.Installing and configuring HAProxyHAProxy is part of most Linux

Home syslog-ng/syslog-ng Wiki - GitHub

Previous configuration with a rewrite rule added to it:source s_tcp_pp { network( port(7777) ip(0.0.0.0) transport("proxied-tcp") );};rewrite r_fixfrom { set("$PROXIED_SRCIP", value("HOST_FROM"));};destination d_file { file("/var/log/pp.log" template("$(format-json --scope nv-pairs)\n"));};log { source(s_tcp_pp); rewrite(r_fixfrom); destination(d_file);};When you send another test message, HOST_FROM will now contain the real source IP address instead of the proxy IP address:{"SOURCE":"s_tcp_pp","PROXIED_SRCPORT":"52532","PROXIED_SRCIP":"172.16.167.1","PROXIED_IP_VERSION":"4","PROXIED_DSTPORT":"6666","PROXIED_DSTIP":"172.16.167.139","PROGRAM":"czanik","MESSAGE":"This is a test fixed","LEGACY_MSGHDR":"czanik: ","HOST_FROM":"172.16.167.1","HOST":"czplaptop"}What is next?From this blog you could learn how to configure syslog-ng for the PROXY protocol and how to validate your configuration using loggen directly. I also showed you a very basic HAProxy configuration and an example for sending logs to syslog-ng through HAProxy. This setup was sufficient to test the PROXY protocol, but using a single server in a production environment does not make much sense.If you need commercial level support to integrate syslog-ng with a proxy or load balancer like HAProxy or F5, consider buying syslog-ng PE which not only providesenterprise support, but also comes with a number of extra features. Do not hesitate to contact us at you have questions or comments related to syslog-ng, do not hesitate to contact us. You can reach us by email or even chat with us. For a list of possibilities, check our GitHub page under the “Community” section at On Twitter, I am available as @PCzanik.. Jun 22 DiskStation syslog-ng[ ]: syslog-ng shutting down; version='3.5.5' Jun 22 DiskStation syslog-ng[ ]: syslog-ng starting up;