In SQL, primary keys serve as identifiers for individual rows in a table. In this tutorial, you’ll learn about primary keys and use a few different kinds to identify unique rows in database tables. Using some sample datasets, you’ll create primary keys on single columns and multiple columns, and use autoincrementing sequential keys.
🟡 Medium ⏱ 10–30 min Last verified: 3 July 2020 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read • Source: Ubuntu Security Notice USN-4899-1 Related CVEs: CVE-2020-1946 CVE-2020-1930 CVE-2020-1931 CVE-2018-11805 CVE-2019-12420 CVE-2017-15705 CVE-2018-11780 CVE-2018-11781 Upstream summary: Damian Lukowski discovered that SpamAssassin incorrectly handled certain CF files. If a user or automated system were […]
Introduction Debian 10 Buster is built around the ethos of stability and free software. Setting up install python 3.7 on debian 10 on Buster leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Buster freeze. Follow each step carefully and the […]
🟡 Medium ⏱ 10–30 min Last verified: 3 July 2020 Affected versions: SLES 12 📖 ~4 min read • Source: SUSE advisory SUSE-SU-2021:3452-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-20795 Upstream summary: iproute2 before 5.1.0 has a use-after-free in get_netnsid_from_name in ip/ipnetns.c. NOTE: security relevance may be limited to certain uses of setuid that, […]
OCSP stapling is a TLS/SSL extension which aims to improve the performance of SSL negotiation while maintaining visitor privacy. Before going ahead with the configuration, a short brief on how certificate revocation works.
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read • Source: Arch ASA ASA-202102-39 Related CVEs: CVE-2020-5208 Upstream summary: Type: arbitrary code execution. Status: Fixed. Affected: 1.8.18-6. Fixed in: 1.8.18-7. Group: AVG-1596. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]
Ghost is an exciting new blogging platform. Although most tasks can be completed through the web interface, there are still some operations that must be completed from the server’s command line. In this article, we will discuss how to upgrade, backup, configure email, and test configuration changes with Ghost from the command line.
O autor selecionou o Free and Open Source Fund para receber uma doação como parte do programa Write for DOnations. Os logs de sistema são um componente extremamente importante no gerenciamento de…
🟡 Medium ⏱ 10–30 min Last verified: 3 July 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read • Source: Debian Security Tracker Related CVEs: CVE-2019-12815 CVE-2019-18217 CVE-2020-9273 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification […]
DNS validation allows for certificate issuance requests to be verified using DNS records, rather than by serving content over HTTP. In this tutorial, you will use the certbot-dns-the cloud provider hook for Certbot to issue a Let’s Encrypt certificate using DNS validation via the cloud provider API.
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