Yearly Archives: 2019

Debian: unattended-upgrades – automatic upgrades installation with email notifications via AWS SES
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23 May 2019

A unattended-upgrades package performs automated upgrades installation on Debian/Ubuntu systems. It’s a Python script (1500 lines) located at /usr/bin/unattended-upgrade (and /usr/bin/unattended-upgrades is a symlink to the /usr/bin/unattended-upgrade). CentsOS/RHEL analog – yum-cron. Install it: [simterm] $ sudo apt -y install unattended-upgrades [/simterm] The main config file is /etc/apt/apt.conf.d/50unattended-upgrades where upgrade types, email settings etc can be… Read More »

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AWS: VPC peering DNS resolution and DNS settings for OpenVPN Access Server
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17 May 2019

We have a VPC with OpenVPN Access Server running. This VPC is connected with other VPCs in our AWS account. The issue is that currently when a user is connected to VPN for the DNS resolution into EC2 instances private IPswe are using dnsmasq service on the VPN-host which has a /etc/dnsmasq.hosts file where are manually… Read More »

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AWS: MariaDB RDS – kill: You are not owner of thread
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14 May 2019

We have AWS RDS with MariaDB. The error below and its solution aren’t specific to AWS RDS and MariaDB. The next error appears during attempt to kill() a thread in MySQL: [simterm] MariaDB [(none)]> kill 759; ERROR 1095 (HY000): You are not owner of thread 759 [/simterm] The solution is to use the mysql.rds_kill() procedure… Read More »

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TestRail: reset admin password
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13 May 2019

We have a TestRail installation but suddenly lose its Admin user password. The Reset Password says that “Email sending failed” although email was configured and users are able to get emails from the server. Also, the log /var/www/testrail.example.com/logs/log-2019-05-13.php didn’t says anything so will reset password in another way – by update this TestRail MySQL database… Read More »

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Bitwarden: an organization’s password manager self-hosted version installation on an AWS EC2
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1 May 2019

We consider Bitwarden as a passwords keeper for our project with the main goal to have an ability to have separated access to secrets by user roles and/or ACLs. I.e. Pass or KeePass are good for self-usage by one person but they have no main things – a normal web-interface and role-based access to data.… Read More »

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Linux: GPG-keys, Pass – passwords manager, and passwords import from the KeePass database
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25 April 2019

pass – a password manager for Linux/UNIX. Stores data in tree-based directories/files structure and encrypts files with a GPG-key. In Arch Linux present by default, in Debian can be installed using apt from default repositories: [simterm] $ sudo apt install pass [/simterm] For macOS can be installed with Homebrew: [simterm] $ brew install pass [/simterm]… Read More »

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Golang: pointers – detailed overview
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20 April 2019

What is the pointer? Shortly, the pointer is a variable which stores an address of another variable, where some data is stored. A pointer example Let’s take the simplest example where a pointer is used: package main import “fmt” func main() { a := 1 b := &a fmt.Println(“A: “, a) fmt.Println(“B: “, b) fmt.Println(“B:… Read More »

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Authy: step by step Multi-Factor Authentication configuration for Github and AWS
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17 April 2019

I’m sure that using MFA (Multi-Factor Authentication) today is oblivious. For 2FA (2-Factor Authentication) the most used method is TOTP – Time-based One-time Password, when alongside with the common login:password also needs to enter a code generated by a device or software. The most known implementation is Google Authenticator but also there is a lot… Read More »

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