If you run a command that produces a lot of output in a Git Bash and you try to scroll up to the beginning of that output, you may see that it has been truncated.
The number of lines that can be displayed in the Git Bash is controlled by a scrollback buffer size (10000 lines, by default).
This short note shows how to increase the terminal scrollback buffer size in the Git Bash. (more…)
jq is a command-line tool for parsing a JSON data (like grep or sed for a text data).
You can use the jq command on Windows using a Git Bash, but firstly it has to be installed as it is not among the default tools.
This note shows how to install the jq for the Git Bash on Windows. (more…)
A workflow in a GitHub Actions can be optimized by splitting it into several jobs, which run in parallel by default.
Parallel jobs is a great way to improve build times and provide a faster feedback to your development & QA teams.
This note shows how to run jobs in parallel in the Github Actions. (more…)
When an OpenVPN client establishes a connection with a server, by default, it uses a /dev/net/tun virtual network device and spawns a tunX interface.
If you have only one OpenVPN client, most of all the name of the interface is tun0 as, by default, there is a dev tun setting in the OpenVPN client’s .ovpn configuration file.
If you have multiple OpenVPN clients on the same machine the later started ones will spawn tunX interfaces from zero, i.e., tun1, tun2, etc.
In case of the multiple OpenVPN clients you may want them to spawn the interfaces with their own predefined names instead of using dynamically assigned ones.
This is useful if, for example, you want to set up different iptables firewall rules for them.
This note shows how to change the name of the OpenVPN client’s interface. (more…)
Helm chart templates in a combination with a values.yaml file, generate manifest files which are YAML-formatted Kubernetes resource descriptions.
The values.yaml file contains default configuration values for a chart.
These default values can be overriding with custom values using special flags.
Before applying to a Kubernetes cluster, the Helm chart templates can be rendered locally and printed to a terminal or saved to a file.
In this note i will show the examples of how to render the Helm chart templates locally using a helm template command. (more…)
Helm uses a packaging format called charts (a collection of Kubernetes resource files).
Helm charts can be downloaded and saved locally using the helm pull command.
This short note shows how to download a Helm chart from a repository and save it locally. (more…)
If in a GitHub Actions workflow you try to check out a repository from an URL with a self-signed certificate or a certificate signed by a non-trusted certificate authority (CA), you will get this error:
request to <URL> failed, reason: self signed certificate in certificate chain
In this note i will show how to fix the self-signed certificate error in GitHub Actions by adding trusted CA certificates. (more…)
A systemd service may fail to start with the error:
Main process exited, code=exited, status=217/USER
The status=217/USER indicates that the user that is configured to run the service could not be found.
This could happen if there is a typo in a username or you have copied a service file from another machine and it contains the user that doesn’t exists on your system.
This also could happen if the user that should run the service is not the local one but comes from some external authentication provider, like LDAP or Active Directory.
This short note shows how to fix the “Main process exited, code=exited, status=217/USER” error for such external user. (more…)
Helm uses a packaging format called charts (a collection of Kubernetes resource files).
Helm chart repositories are remote HTTP servers where packaged charts can be stored and shared.
This short note shows how to list Helm charts and repositories using the helm command. (more…)
MikroTik RouterOS has a very powerful firewall implementation.
It is enabled by default and contains that rules that allow to ping to your MikroTik router from outside, access it from LAN and drop everything from WAN.
This short note shows how to list firewall rules on a MikroTik router through the WinBox/WinFig interface or from the command line. (more…)