Principal Software Engineer/Architect, motorcyclist, drummer, and artist
I’ve written a number of Python apps where I would like it to print some sort of counter or progress bar to STDOUT to let me know that it is still running instead of locked up or died somehow without me being able to see it.
I had tried using a couple of different existing progress bar related modules but none of them really worked except in a very specific use case.
So, after a bit of futzing around I → Continue reading “Creating a Counter or Progress Bar for a Python Program”
The Mockito and PowerMockito libraries for JUnit4 are not always the most intuitive.
Following is an example of how to spy and verify a static void method.
@Test
public void testAdd() {
// Prepare the Utils class to be spied.
PowerMockito.spy(Utils.class);
// Run the test and get the actual value from the OUT
int actualValue = App.add("Test1", 1, 1);
/*
* To verify the number of times that we called Utils.doSomething we
* first need to tell the PowerMockito library In general, I have moved to writing all of my applications to write their log output to STDOUT. This makes running them on the command line, in an IDE, on a bare metal box, VM, or in a container completely decoupled from how you store and view the logs. No more having multiple logging configs for each flavor of deployment.
In this particular case, I am running an application in a container (but it isn’t necessary that it is in → Continue reading “Configuring rsyslog to rotate log files from log messages streamed to it from a Systemd service”
Let’s say that you have a range of lines in a source file (lines 11 – 17) that you want to comment out with a ‘#’ and a space character before the line.
To do that, you would use sed, specifying a range of lines and then specify a replacement command with a capture group as follows:
sed '11,17{s/\(\w\)/\# \1/}' filename.pyIf you want to just redirect STDERR to tee, run the following command.
some-command 2> >(tee /var/tmp/output)Following is a quick how-to on compiling and adding addition SELinux modules.
When configuring and deploying new and/or custom services on systems that are enforcing SELinux you will likely have to compile addition SELinux modules.
This how-to includes how to go through each step of compiling a new module one-by-one; similar to the model of breaking down the compilation of C and C++ into it’s composite steps.
Step 1: Gather the audit.log entries
You will need to determine which → Continue reading “How To Compile and Install New SELinux Plicy Modules”
There are a number of tutorials online for adding a new disk to a machine and then extending an existing LVM partition to use the new device.
This particular tutorial covers the use case of adding a new disk to a Linux server and then creating a NEW LVM partition on it without modifying the existing devices and LVM partitions.
The first thing you will need to do is add the physical device to the server (or VM).
Then, you → Continue reading “Adding a New Disk to a Linux Server and Creating an LVM Partition”
I am working on a VM that is running GNOME under RHEL 7 and I typically run with 12 workspaces. The default GNOME install only has the keyboard shortcut configurations up to “Switch to workspace 4”.
It turns out that the solutions is to use the gsettings cli tool to add additional shorcuts.
$ gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-5 "[\"<ControlF5\"]"
$ gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-5 "[\"<Alt5\"]"Or, otherwise know as: SELinux and Silent Denials.
Sometimes when troubleshooting SELinux issues, you will have added new policies for each of the denial causes written to the audit.log, but SELinux will still be denying access . . . and not giving you any further information about it in the audit.log.
Various processes often execute additional system calls that are above an beyond what they need to do for normal operation. Many of them are blocked, and in order to → Continue reading “How to See SELinux Denials That Do Not Show In the audit.log”
In order to be able to access a Samba share on a remote client as a mounted file system execute the following command, as root on the client:
mount -t cifs -o user=<user-on-samba-share,uid=<uid-on-local-macheine,gid=<gid-on-local-machine,rw,workgroup=<your-workgroup//ip/share /mnt/mount-point-dirYou will be prompted for the password for the user defined on the Samba server.
If you are able to authenticate, and then get the following error:
ls: reading directory .: Permission deniedCheck the SELinux context type of the directory on → Continue reading “Mounting a Samba Share From Linux Client to Linux Samba Server”