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| You are not logged in | KNOWLEDGEBASE AND FAQ
COUNTER
What is a counter?
What kind of counters can I have?
How do I create a counter?
How do I insert data into my counter?
How do I use my counter on my webpage?
I don't understand what the "interval" is?
What is the most optimal time period in auto-interval?
How long is the data stored?
Will my counter ever be deleted?
I have inserted wrong data - can I delete those?
How about security of my data (write protect)?
Can anyone modify my counter settings?
Can my counter be associated with more than one user account?
I cannot associate my counter to my user account?
Do you have any examples of how to insert data from an Unix box?
USER
Do I need an user account?
I have forgot my username and/or password - what do I do?
Will my user account ever be deleted?
COUNTER
What is a counter
It is a 40 character unique ID used to identify your counter. You get this ID when you create a new counter.
What kind of counters can I have?
If you can get a number (integer or float) of whatever you want to monitor, you can monitor it through HovMon.
You can monitor everything you wish - eg. website visitors, internet bandwidth utilization, available diskspace, SNMP data,
stock portfolio, DNS requests, computer uptime, incoming emails and so on...
How do I create a counter?
Just go to Create counter and setup the graph settings as you wish.
How do I insert data into my counter?
You can use the Windows application or you can do it manually. There are several coding examples (shell scripts) on the
Demo Zone.
From a Unix/Linux terminal it is quite simple:
curl http://data.hovmon.com/?cid=[40-characters-ID]&val=[your-data-value]
If you inserts data manually, always use the above URL.
How do I use my counter on my webpage?
Just fetch an image with the IMG HTML tag:
<img src="http://data.hovmon.com/graph/?cid=[40-characters-ID]">
If you want to specify a time period, use the days, hours, mins or secs variables in the URL:
<img src="http://data.hovmon.com/graph/?cid=[40-characters-ID]&hours=48">
If you do not specify a time period, it defaults to 6 hours.
I don't understand what the "interval" is?
Interval is 1 data per interval and it is only used when you read/output your graph.
Eg. 1minute has 1 data sample per minute.
The interval 8hours has 1 data sample per each 8 hours (00-07, 08-15, 16-23).
All intervals (except the All interval) are recalculated average from the original data.
All original data goes directly into the All interval.
You don't need to specify any interval, as this is calculated automatically to the "best fit" (the prettiest graph).
When you read/output a graph, you can force an interval by specifying it in the URL:
<img src="http://data.hovmon.com/graph/?cid=[40-characters-ID]&interval=20minutes">
Available intervals are: All, 1minute, 20minutes, 1hour, 8hours or 1day
What is the most optimal time period in auto-interval?
If you don't specify any interval, you will get the best looking graph with the below time periods:
1minute = aprox 5 hours
20minutes = aprox 15 hours
1hour = aprox 12 days
8hours = aprox 1 month
1day = aprox 1 year
How long is the data stored?
Your original data will get deleted after 2 days but the recalculated data will stay (forever?). There are
no current plans on how long time the data will be kept, but the main purpose with this site is to be able to
see very old data but of course we can only handle "resonable" data amounts.
Will my counter ever be deleted?
Counters with no new data in 2 months will get deleted.
I have inserted wrong data - can I delete those?
No, not in the current moment. You can only clear ALL your data.
How about security of my data (write protect)?
You can protect your counter so it requires a password to write data to it. You can only protect the counter,
if you have an user account (only then the options will be chooseable). If you try to write data
to a protected counter (without giving the password), the data will get discarded! The password is a special
counter password (you specify this password in your user account) and it must be given on the URL:
curl http://data.hovmon.com/?cid=[40-characters-ID]&val=[your-data-value]&psw=[40-characters-password]
You can not protect read access.
Can anyone modify my counter settings?
If you have an user account, it is only your user account that can modify your counter settings. If you
do not have an user account, anyone, that knows the counter ID, can modify it.
Can my counter be associated with more than one user account?
No. A counter can only be associated with one user account at a time.
I cannot associate my old counter to my new user account?
It is most likely already associated with another user account. If you have an old user account, with this
counter associated, you must remove the association before you can associate it to your new user account.
If you think someone else have associated your counter to their user account, stop sending more data
and create a new counter.
Do you have any examples of how to insert data from an Unix box?
Plenty - the best way is to see the Demo Zone. There all my graphs are online and all shell scripts are also available.
Source: Get ping latency to my secondary server
Source: Get internet bandwidth utilization from my SNMP capable router
Source: Get internet bandwidth utilization from my SNMP capable router
Source: Number of request/second to my Apache webserver
Source: How much available diskspace
Source: Get my FreeBSD uptime
Source: Get my FreeBSD CPU temperature
Source: How many incoming emails daily
Source: The stock value of Hvidbjerg Bank
USER
Do I need an user account?
Well, yes and no. If you want to write protect your counter, then you need an user
account but otherwise not. You can easily have counters without having a user account, but it is though
easier to manage your counters, if you have an user account. New counters are automatically associated to
your user account.
I have forgot my username and/or password - what do I do?
You can have your login credentials sent to your email address. If you cannot remember your email
address, you can specify one of your associated counters.
Will my user account ever be deleted?
User accounts with no associated counters and no logins in 2 months will get deleted.
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