Proofreading
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Asif Bacchus
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# Using Logwatch to monitor Cloudflare DDNS updater script <!-- omit in toc -->
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The Cloudflare DDNS update script's log file has been setup so that utilities
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The Cloudflare DDNS update script's log file has been set up so that utilities
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like Logwatch can easily parse it. In order to make that happen, a LogFile
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group file, service and script have to be created for Logwatch to generate
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Group file, Service and Script have to be created for Logwatch to generate
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reports. The correct (general) directory structure has been created in this git
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archive already. Below are the details of each file.
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@ -13,7 +13,7 @@ archive already. Below are the details of each file.
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- [Archive location and name format](#archive-location-and-name-format)
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- [External script for timestamp processing](#external-script-for-timestamp-processing)
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- [Service definition file (/etc/logwatch/conf/services/cfddns.conf)](#service-definition-file-etclogwatchconfservicescfddnsconf)
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- [LogFile group definition](#logfile-group-definition)
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- [LogFile Group file definition](#logfile-group-file-definition)
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- [Report title](#report-title)
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- [Service script (/etc/logwatch/scripts/services/cfddns)](#service-script-etclogwatchscriptsservicescfddns)
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- [Detail levels](#detail-levels)
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@ -27,18 +27,16 @@ archive already. Below are the details of each file.
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### Log file location
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This file is commented so you can update it as necessary for your environment
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(i.e. you've changed the name of the log file generated by the script via the -l
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parameter).
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Update this as needed to point to the location and name of the log file
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generated by the updater script. Remember, by default, the log file is created
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in the same directory as the script itself.
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```Ini
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LogFile = /path/to/your/cfddns.log
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...
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```
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Update this needed to point to the location and name of the log file generated
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by the updater script. Remember, by default, the log file is created in the
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same directory as the script itself. Best practices suggest you use the *-l*
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Best practices suggest you use the *-l*
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flag to change this location to something like */var/log/cfddns.log*, for
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example. In that case, the entry would look like:
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@ -50,7 +48,7 @@ LogFile = /var/log/cfddns.log
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### Archive location and name format
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If you want Logwatch to process old (archived) log files generated by something
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like *Logrotate*, then you have to specify that location and file name format of
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like *Logrotate*, then you have to specify the location and file name format of
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those files. I've included the generalized compressed format of such rotated
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files as the default in the script. Suppose you store your log files in the
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recommended location (*/var/log/*) and are using *Logrotate* with compression
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@ -72,8 +70,9 @@ option in Logwatch to true. You can comment/delete this line if you wish.**
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### External script for timestamp processing
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Since the log file uses a non-standard (according to Logwatch) method of
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time-stamping, a custom filter had to be created. See the relevant section of
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this document for more information.
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datestamping, a custom filter had to be created. See the
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[relevant](#timestamp-processing-script-etclogwatchscriptssharedsqfullstampanywhere)
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section of this document for more information.
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The script file is called with an *\** before the filename.
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@ -89,8 +88,8 @@ so your filename should be all lowercase also.
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## Service definition file (/etc/logwatch/conf/services/cfddns.conf)
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### LogFile group definition
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The service file needs to know what group of log file it is responsible for
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### LogFile Group file definition
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The service file needs to know what group of log files it is responsible for
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processing. This MUST match the name of your *LogFile Group file*:
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```Ini
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@ -118,11 +117,12 @@ Logwatch calls any script with a name that **matches the service name**. You'll
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notice that I just named everything *cfddns* to keep things simple. You can
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change this to whatever you want, however. If you changed the service name to
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*"cloudflare*.conf", for example, you would have to rename this script file to
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"*cloudflare*" with no extension. Note: The script is a PERL file.
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"*cloudflare*" with no extension. Note: The script is a PERL file (note the
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shebang) but it can be written in any language.
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In essence, Logwatch just spits out the log file(s) defined in the LogFile Group
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file as standard input (STDIN) and then takes whatever is output (STDOUT) and
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assembles that into it's report.
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file as standard input (STDIN) for the script and then takes whatever is output
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(STDOUT) from the script to assemble into it's report.
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### Detail levels
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@ -131,10 +131,12 @@ The script supports four (4) detail levels as follows:
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- **Level 0: Summary output only**
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- This will display an aggregate total of certain logged elements. It will
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display the total number of hostnames (A and AAAA) that are already
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up-to-date, those that needed updated, those successfully updated and the
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total number of errors (or any type) encountered by the script. All
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up-to-date, those that needed updating, those successfully updated and
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the total number of errors (of any type) encountered by the script. All
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totals are relative to the reporting period Logwatch is using (--range
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parameter). **This is the recommended reporting level.** It does not
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parameter).
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**This is the recommended reporting level.** It does not
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take up much space and is quick to read. If you see successful updates
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match the number of needed updates and no errors logged, then things are
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working properly. If you notice errors, you should consult the full
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@ -151,7 +153,9 @@ The script supports four (4) detail levels as follows:
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messages such as the detected IP address and the specific names of any
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hostnames not found in your Cloudflare account, etc. This level of
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reporting is useful in diagnosing why errors are occurring or if you just
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want more insight into how the script works. **This level of output will
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want more insight into how the script works.
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**This level of output will
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make your Logwatch reports longer and consume more of your time to
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review. You should not use this level day-to-day.**
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- **Levels 6+: Complete log file dump**
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@ -159,7 +163,9 @@ The script supports four (4) detail levels as follows:
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script to dump the entire log file out to Logwatch line-by-line. This is
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useful only if you are debugging an issue and cannot get access to the
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actual raw log file itself. The actual log file is colour-coded which
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makes it much easier to read. **Use this detail level only when you need
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makes it much easier to read for debugging purposes.
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**Use this detail level only when you need
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to see the entire log file and cannot otherwise access the log file.**
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## Timestamp processing script (/etc/logwatch/scripts/shared/sqfullstampanywhere)
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@ -167,15 +173,15 @@ The script supports four (4) detail levels as follows:
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This is basically a modified version of the '*applyeurodate*' script that comes
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with Logwatch. It had to be modified to search within [square brackets] and to
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accept characters coming before the stamp (i.e. ANSI colour codes). If you
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change '**stamp**' variable in the updater script to update the timestamp to
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change the '**stamp**' variable in the updater script to update the timestamp to
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your liking (which to totally fine!) then you'll probably have to update this
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file. There are two lines you need to modify to suit your new '**stamp**'
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variable.
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### The time format specification
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SearchDate is the variable used in the PERL script to do exactly what it says,
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search for the date stamp. I have it set up to look for the format
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'*$SearchDate*' is the variable used in the PERL script to do exactly what it
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says, search for the date stamp. I have it set up to look for the format
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'*year-month-date hour:minute:second*'. Note, we don't care about brackets or
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anything here, we're just defining the format of the date/time stamp.
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@ -187,7 +193,7 @@ $SearchDate = TimeFilter('%Y-%m-%d %H:%M:%S');
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If you changed the '**stamp**' variable so it was formatted as '*month/day/year
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hour:minute*' (ex: '*[09/27/2018 18:38]*') then you'd update the **$SearchDate**
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variable as follows:
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variable as follows (note: no mention of the square brackets!):
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```Perl
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...
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@ -242,13 +248,13 @@ locally on your screen with the following command (assuming you kept default
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names for everything):
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```Bash
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# Summary output entire duration of log file
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# Summary output, entire duration of log file
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logwatch --service cfddns --output stdout --format text --range all --detail 0
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# Minimal detail yesterday only
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logwatch --service cfddns --output stdout --format text --range yesterday --detail 1
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# Minimal detail, yesterday only
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logwatch --service cfddns --output stdout --format text --range yesterday --detail 3
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# Verbose output today only
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# Verbose output, today only
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logwatch --service cfddns --output stdout --format text --range today --detail 5
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```
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@ -256,5 +262,5 @@ logwatch --service cfddns --output stdout --format text --range today --detail 5
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That's it! I'm a horrible PERL programmer so if anyone can optimize/improve the
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script file used for Logwatch then please do it! Otherwise, I hope this made
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sense and helped you out integrating the updater script with Logwatch for easy
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sense and helped you integrate the updater script with Logwatch for easy
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monitoring :-)
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