Questions[check-mk](server)

Hi I am new to check_mk and not very good in linux server configuration at all, so thanks for your patience.

I installed check_mk under debian via gdebi (systemd not xinetd - and used default configuration so far) and also deployed several agents already. That worked good on most machines. but on machines, where ipv6 is deaktivated for security reasons, it does not work. (https://security.stackexchange.com/questions/181949/how-would-disabling-ipv6-make-a-server-any-more-secure seems to be not the worst idea)

checking netstat -npa | grep 6556 showed me its tcp6 listening.

tcp6       0      0 :::6556                 :::*                    LISTEN      1/init

When I check telnet localhost 6556 I get the agent output (the same when I run check_mk_agent).

And check_mk dashboard tells me it can ping that server. So it is there.

What are my chances to fix that problem without activating ipv6?

Thanks :)

I would like to kindly ask for some advice.

I have configuration that looks like this:

Users are in Contact Groups. In Host Folders I have permissions to Contact Groups. And Hosts inherits this setting from folders

That works fine for Global Notification Rules But I Have SMS notifications with different time periods defined.

So in every user with sms notification, I’ve created new custom notification rule for user

It works, and sends sms in proper time periods.

Problem is that it now send notifications for all hosts not for the one that should be send. So it sends sms messages for users even if they are not in Contact Groups of that server.

And I’m stuck. Can someone try to help me?

In Global Notification Rules there is option “Restrict to Contact Groups” that should be ok for me, but it’s not available in custom user Rules. There is option “Match Contact Groups” instead but it doesn’t work like this .

I've installed omd 2.90-labs-edition. After creating new site I want to login to check_mk (1.2.8.p20) web interface, but the given credentials do not work, I've got "Invalid credentials". This credentials only work for thruk web interface.

Here's output for creating a new site:

Adding /omd/sites/test/tmp to /etc/fstab.
Creating temporary filesystem /omd/sites/test/tmp...OK
Apache port 5000 is in use. I've choosen 5001 instead.
Restarting Apache...OK
Created new site test with version 2.90-labs-edition.

The site can be started with omd start test.
The default web UI is available at https://servername/test/

The admin user for the web applications is omdadmin with password: password
(It can be changed with the 'set_admin_password' command as site user.)

Please do a su - test for administration of this site.

New site is started, but login page for https://server_address/test/check_mk/login.py only gives me "invalid credentials" after login to "omdadmin" user.

Can't find the reason why... no information in logs /omd/sites/test/var/log/apache/error_log

Unfortunately tip about changing initial credentials for omdadmin user from https://mathias-kettner.com/check_mk-werks.php?werk_id=7643&__hstc=14126696.95407ad675cb255879d5c9f0e7607474.1553259391987.1553519829997.1553598167959.3&__hssc=14126696.1.1553598167959&__hsfp=3878063914 doesn't work for me or I do something wrong...

How to login to check_mk webinterface? Any suggestions appreciated.

I'd like to be able to create a notification that alerts based on the availability of a group of services, instead of just one threshold. For example, say I have 10 AWS servers that all do the same thing, and I expect some of them to be overloaded / fail sometimes without hurting the application: I want Check_MK to notify me if 3 out of 10 of the servers (or higher) fail in a given service. If one fails, don't notify me. Another example, perhaps simpler: say you have an NFS mount point on 20 servers, from the same NFS server. I don't want to get 20 warnings or criticals when I can just get one.

The above examples in my environment are already grouped in service groups.

I tried three different mechanisms in Check_MK 1.2.6p16:

1. Using Business Intelligence. The grouping and warning setting was fantastic, it did what I wanted! But the Notification Rules don't allow for anything related to the BI components of the product!

2. Cluster - I set up a cluster for the AWS servers, but since some of my checks (most notably my HTTP active check) requires a hostname, that's not going to help. I don't think Cluster is the right rabbithole to go down here, but correct me if I'm wrong. I abandoned looking at that.

3. Service Group Alert -- the purpose of this original question. There's nothing in the Notifications logic that lets me alert on service group availability.

Anyone accomplish this with Check_MK?

http://mathias-kettner.de/check_mk.html

I've been testing it out on a couple of development machines and it seems pretty nifty. I cannot however find much information on deployments of it. Does anyone run this actively? Did anyone rule this out as an option for some reason?