Articles by peter

Introduction

In order to gain some knowledge about Grafana, InfluxDB and Telegraf I did a basic installation. Grafana and InfluxDB were installed on a CentOS 7 server. The Telegraf agent was installed on a separate CentOS 7 server (which also hosts petersplanet.nl by the way).
Versions:
InfluxDB: 1.7.1
Grafana: 5.3.4-1
Telegraf: 1.8.3-1
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Although I had setup a daily cronjob for the certbot renew command it appeared that the automatic renewal did not work. It only worked interactively as root.
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If you want to experiment with servers and applications you will probably need your own test lab with virtual machines. The point is that you don’t want your test lab to interfere with your home network. This can be easily realised with Oracle VirtualBox and a network address translation network (NATNetwork) on  a workstation.
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Some time ago I had reinstalled petersplanet.nl on a new CentOS 7 Linux server with the latest WordPress version. However when I tried to upload new content this was not possible anymore. The error message was that the uploaded file could not be moved to wp-content/uploads/2017/04.
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When access is denied to certain files folders it might be SELinux. You can check this in the /var/log/audit/audit.log
In this example we have changed the html folder in /var/www/ for the Apache HTTP server.
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It is also possible to use Ansible to create an instance on Amazon AWS. I have used the Ansible EC2 Cloud Module to create a CentOS 7 Linux instance. See http://docs.ansible.com/ansible/list_of_cloud_modules.html.
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Ansible is a great tool to automate the repetitive tasks on your servers. The target nodes will often be Linux but can also be Windows. The management server must be run on Linux.
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