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Nagios Notifications using SMTP server with Authentication

We needed to setup Nagios to utilize our internet service providers SMTP Email server for notification emails. The biggest problem was that the ISP’s outgoing email server requires authentication. Nagios setup with SMTP outgoing authentications. These are instructions and examples on how we got this setup working. I hope this helps others in the Nagios […]

How to gracefully reboot MariaDB Galera Cluster servers?

Cluster Configuration In this example configuration of two nodes, we assume that the servers are connected over private network. This allows direct connections without requiring SSH tunnels. The most important parts is to enable listening on IP protocol and to configure addresses and names of the cluster nodes. The config files are similar for each […]

Howto install sar & ksar system activity info in Centos / Redhat

The sar command collect, report, or save UNIX / Linux system activity information. It will save selected counters in the operating system to the /var/log/sa/sadd file. Fromlinux-logo the collected data, you get lots of information about your server: CPU utilization Memory paging and its utilization Network I/O, and transfer statistics Process creation activity All block […]