Posts Categorized: Uncategorized

CentOS 8 munin-node needs PowerTools

I had the following error installing munin-node on a new CentOS 8 system: Depsolve Error occured: Problem: package munin-node-2.0.54-2.el8.noarch requires perl(Net::SNMP), but none of the providers can be installed\n – conflicting requests – nothing provides perl(Digest::SHA1) >= 1.02 needed by perl-Net-SNMP-6.0.1-25.el8.1.noarch Solution is to enable the repo CentOS-PowerTools sed -i ‘/enabled=0/enabled=1/’ /etc/yum.repos.d/CentOS-PowerTools.repo

Chef Knife List Nodes with IPs

I had to fiddle a bit with this so possibly worth keeping a note of it. I wanted to pull all the node hostnames and ip addresses from chef for use in hostname lookups and ssh config.

Proxmox: adding internal private nework

In this scenario I wanted to be able to run several VMs that can communicate with each other on a private subnet e.g. 10.10.10.* and also be access the internet for updates etc. Eventually I want to expose some of the internal services. My proxmox server has one network interface with an internet facing IP… Read more »

SELinux: Create Policy for NRPE Writing

Had a problem with Nagios/NRPE checks that are configured to write a status file as part of their check. The path /var/logstate was the target created the policy below. Andrew (Urban Penguin) Youtube video is an excellent resource. Install selinux utilities: yum install policycoreutils policycoreutils-devel setools-console setroubleshoot The audit log (/var/log/audit/audit.log) was showing the type=AVC… Read more »

Nagios NRPE omreport errors

Nagios check for Dell OpenManage was failing after upgrade to srvadmin 9.2 with: UNKNOWN: Problem running ‘omreport chassis memory’: Error: SMStatus: 700 UNKNOWN: Problem running ‘omreport chassis batteries’: Error! XML Transformation failed UNKNOWN: Problem running ‘omreport chassis pwrmonitoring’: Error: SMStatus: 700 UNKNOWN: Problem running ‘omreport chassis removableflashmedia’: Error: SMStatus: The check command: /usr/lib64/nagios/plugins/check_openmanage -s -b… Read more »

ThingsBoard API: Get telemetry values

I’m using Insomnia for testing and after already getting the auth token I use that in Insomnia as follows: The URL I used for the query was: The word device in there does not need to be changed by the ID field that follows it should be changed to the UUID of your device. You… Read more »

Blink Hard Disk Light on Dell

To blink the light on a hard disk on Dell Server from the command line first get a list of the physical disks so you can check the disk ID: omreport storage pdisk controller=0 then to blink the disk: omconfig storage pdisk action=blink controller=0 pdisk=0:0:2