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Signal Desktop and Failed to Map Segment from Shared Object Error

Signal Desktop and Failed to Map Segment from Shared Object Error

Signal is a great encrypted communications application built upon Electron framework. Couple of months ago I faced the issue that Signal had failed to start showing a message like this: “Uncaught Exception: Error: /tmp/.org.chromium.Chromium.j4ITUv: failed to map segment from shared object”.

Here is the solution.

wwa August 27, 2018August 27, 2018 Uncategorized No Comments Read more

Pitfalls When Upgrading Ubuntu Xenial to Bionic

Pitfalls When Upgrading Ubuntu Xenial to Bionic

The article describes a few pitfalls I encountered when trying to upgrade from Ubuntu 16.04.5 (LTS) to Ubuntu 18.04.1 (LTS) and possible solutions.

wwa August 26, 2018 Server Administration No Comments Read more

Sometimes I Hate systemd

Sometimes I Hate systemd

After upgrade from the latest Ubuntu 16.04 LTS to Ubuntu 18.04.1 LTS, the server refused to reboot. I had to use IPMI to connect to the otherwise unresponsive server and reboot it forcefully. I probably should have used sync; reboot

wwa August 25, 2018August 25, 2018 Server Administration No Comments Read more

CentOS 7: How to Change SSH Port

CentOS 7: How to Change SSH Port

Many times my colleagues have asked me how to change SSH port on CentOS 7, because the way they did it themselves resulted in failures of OpenSSH to start. This happened because of SELinux, and the post explains how to overcome the issue without turning SELinux off.

wwa July 30, 2018October 15, 2018 Server Administration No Comments Read more

How to Integrate rkhunter with yum

How to Integrate rkhunter with yum

One of the features of rkhunter in CentOS that I miss is the ability to update rkhunter‘s property database automatically after yum is run (just like in Debian). This post explains how to implement this feature.

wwa July 6, 2018July 7, 2018 Server Administration No Comments Read more

How to Integrate monit with yum

How to Integrate monit with yum

Monit is an utility for managing and monitoring processes, programs, files, directories and filesystems on a Unix system. It is often used to restart daemons on failures and abnormal situation, and sometimes to detect changes into critical files and / or daemon binaries. This article explains how to make `yum` package manager play nice with `monit`.

wwa June 9, 2018June 9, 2018 Server Administration No Comments Read more

Bootstrap Alpine Linux LXD Container with Ansible

Bootstrap Alpine Linux LXD Container with Ansible

A recipe to bootstrap an Alpine Linux based LXD container with Ansible.

wwa May 31, 2018May 31, 2018 Server Administration No Comments Read more

How to Log Successful SSH Login Attempts

How to Log Successful SSH Login Attempts

Sometimes it can be useful to get notified when someone logs into the system via SSH. This article shows several possible solutions how to configure those notifications.

wwa May 30, 2018May 30, 2018 Server Administration No Comments Read more

CentOS, wp-cli, and rkhunter

CentOS, wp-cli, and rkhunter

This story was told by my colleague. She had a CentOS 7 server with a bunch of WordPress installations, and she needed to update them all. She obviously did not want to do that manually and preferred to use wp-cli.

wwa May 30, 2018May 30, 2018 Server Administration No Comments Read more

How Slow Are C++ Exceptions?

How Slow Are C++ Exceptions?

In Systematic Error Handling in C++ Andrei Alexandrescu claims that C++ exceptions are very slow. And though I have no doubts because I know the internals of exception handling, it is interesting to see some proofs yourself by benchmarking how fast or slow exceptions are.

wwa May 22, 2018May 22, 2018 Uncategorized No Comments Read more
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