45 lines
1.6 KiB
Markdown
45 lines
1.6 KiB
Markdown
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---
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layout: post
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title: "Syslog on Mac OS X: Cheat Sheet"
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date: 2015-02-21 00:41
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comments: true
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categories:
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- mac
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- osx
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- syslog
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- cheatsheet
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---
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This is a quick cheatsheet to work with [`syslog(1)`](https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/syslog.1.html) implementation OS X uses.
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`Console.app` provides a nice UI to access logs in mac, you can do some basic filtering and search, but its limited in terms of raw control a terminal gives you.
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`/usr/bin/syslog` can be used to both send and receive logs. Alternatively [`logger(1)`](https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/logger.1.html) can be used to send logs to syslog.
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## Print logs from a specific facilitiy
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```bash
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# -w: similar to tailf
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syslog -k Facility local1 -w
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```
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## Sending logs
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```bash
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# -l severity level
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syslog -s "message"
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```
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## Sending logs upstream to another syslog server
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Syslog can forward your logs too. The configuration resides in `/etc/syslog.conf`. You can append forwarding rules in this file, format is
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```
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# Tab separated
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Facility.Level @IPADDR:PORT
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```
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After this reload syslog daemon.
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```
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sudo launchctl unload /System/Library/LaunchDaemons/com.apple.syslogd.plist
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sudo launchctl load /System/Library/LaunchDaemons/com.apple.syslogd.plistp
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```
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# Extra reading
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1. [`asl.conf(5)`](https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man5/asl.conf.5.html) - Configuration file for Apple Syslog Log (A syslog superset apple implements), this is where all the logic to route logs are set
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facility.level
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