Nagios Support Forum

Posted: **Tue Sep 14, 2021 5:37 pm**

Hello Team,
I am having problems with my Log Server, it is an old version 1.4.4. I am unable to apply the configurations via UI. I receive the following message:

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192.168.102.4 (logserver) The instance is likely offline, please check and try again.

In the PER INSTANCE view I got the following message:

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It looks like this instance hasn't checked in the last 5 minutes.
Normally this means it is not online or elasticsearch is not running.
If you don't know why it's offline, try these:

    Verify that elasticsearch is running on the instance and start elasticsearch if necessary
    Check the connection (firewall, cable link) to the instance from this instance
    Wait for the instance to return to an online state and check in

And it seems that the System Jobs aren't been executed, and this is a problem because I have a job that will send an alert in case the server receive certain kind of logs.

I dont know what else to do.

Posted: **Wed Sep 15, 2021 1:53 pm**

Hi,

How many nodes are you using?
Is elasticsearch running on the node that is giving you problems?
What does the diskspace look like on that machine?

Thanks

Posted: **Wed Sep 22, 2021 9:47 am**

Hi, just one node and yes elastic search as well as logstash are running. Also there are plenty of space.

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[root@logserver ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 3.7G     0  3.7G   0% /dev
tmpfs                    3.7G     0  3.7G   0% /dev/shm
tmpfs                    3.7G  385M  3.3G  11% /run
tmpfs                    3.7G     0  3.7G   0% /sys/fs/cgroup
/dev/mapper/centos-root  823G   37G  786G   5% /
/dev/sda1               1014M  354M  661M  35% /boot
/dev/mapper/centos-home  100G   33M  100G   1% /home
tmpfs                    742M     0  742M   0% /run/user/0

We also delete any kind of restriction in the firewall to be sure that the problem wasn't there, but we got the same message.

Posted: **Thu Sep 23, 2021 10:54 am**

Hi gsmith we are only using one node, elasticsearch is running as well as logstash, and there is plenty space in the server.

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[root@logserver ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 3.7G     0  3.7G   0% /dev
tmpfs                    3.7G     0  3.7G   0% /dev/shm
tmpfs                    3.7G  385M  3.3G  11% /run
tmpfs                    3.7G     0  3.7G   0% /sys/fs/cgroup
/dev/mapper/centos-root  823G   38G  785G   5% /
/dev/sda1               1014M  354M  661M  35% /boot
/dev/mapper/centos-home  100G   33M  100G   1% /home
tmpfs                    742M     0  742M   0% /run/user/0

Posted: **Thu Sep 23, 2021 3:58 pm**

Please PM a copy of your profile, you can download it from Admin > System Status by clicking the Download System Profile button.

You can try restarting the services:

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service elasticsearch restart
service logstash restart

Posted: **Thu Sep 23, 2021 6:08 pm**

Please PM me these files:

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/var/log/logstash/logstash.log
/var/log/elasticsearch/9968e8c1-5eef-468e-8a92-9e89e2625c66.log

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