Month: August 2022

technology server behind NGINX reverse-proxy

The most recent server release requires one additional thing in the configuration comparing to versions in the past years. Having on one box and NGINX on another one requires setting up a reverse proxy, which is straightforward operation. You need to remember to add proper headers to pass hostname and schema to box. This whole thing is described in the documentation. But… you are required to put the following into a configuration file: This should be put in bold letters beause without this one you could upload artifacts into buckets, but will not be able to


DEGRADED ZFS pool, hard disk failure

I own a preowned HP z800 workstation. As purchased it contained HDD inside – Western Digital WD5000AAKX-75U6AA0, SATA III, 500GB, 7200 RPM, 16MB of cache. Unfortunately it passes SMART and do not show wearout metric. However going into detailed information we get: Raw_Read_Error_Rate has positive value of 11, threshold is set to 51. Having 11 685 hours of runtime it should understandable that it might break and it did actually. There is only one Current_Pending_Sector which means that it waits to be remapped or rellocated. But, will it happen anytime soon? I’m unable to clone, migrate or replicate VM to


Docker Registry on Ubuntu 20.04

Docker Registry could be useful in various scenarios, but the most common would be containers orchestration software such as Kubernetes, OpenShift/OKD or Nomad. In example environment you could have Gitlab CI pipeline configured to build Docker image and push it to your registry and then let orchestration software to deploy it to a cluster. In order to install internal, private Docker Registry you need to install Docker package first. Then you need to grab certificate and start docker registry container: This way we start a registry container which will always be up and running. We bind it on port 443


Ubuntu 21 (impish) updates unavailable

I was trying to add some new packages and figured it out that my Ubuntu 21 is out of date. Unfortunately some time ago I unchecked all repositories in Software & Updates so my /etc/apt/sources.list was empty. But I managed to have it working properly adding this one: Next and I was more or less back on the track. How trivial was it just to be able to install default-jre package as I am trying to learn how to build custom deb packages.


pg_stat_statements must be loaded via shared_preload_libraries

Latest Clustercontrol – version 1.9.4 – installation somehow requires pg_stat_statements to be activated in PostgreSQL 14. I have never noticed it before, both on 9.6, 12 and 14. This is simple fix. Change postgresql.conf configuration file (which should be either in /etc or /var/lib/ in standard package installations): Then activate extension in psql: Restart server and you are done.


Mirror Git repository

If you need to mirror remote repository and push it to another remote repo, then there is one thing you should do to be able to export all remote branches and not only the master. It will push all things remotely, but it varies from version to version so better double check.


Extending CentOS7 partition on Azure

Using CentOS7 templates on Azure could result in lack of LVM, swap and non auto-extendable partitions. Some other templates have such feature, but not all of them. In case you assigned bigger disk in Azure portal you need still to do few things. First delete /dev/sda2 partition: Then reboot to apply.


Zabbix Proxy 4.2 installation years later

Old Zabbix Proxy 4.2 installation could be quite confusing as you cannot grab the latest one to work with old Zabbix server. Fortunately there is archive packages repository at You need to keep track which operating systemu should be used. Refer to server requirements as it will be the same. So it’s Ubuntu 14, 16 or 18. First you should grab repository package which can be found named zabbix-release. For example: After installation with dpkg command, you can install particular proxy package with either MySQL, PostgreSQL or SQLite3. If you choose MySQL then you need to manually install database