December 2020 - Page 25 of 69

Android GridLayoutManager Example — step-by-step DevOps tutorial on Progressive Robot

Android GridLayoutManager Example

Android GridLayoutManager is the RecyclerView.LayoutManager implementation to lay out items in a grid. In this tutorial, we'll create an application that displays [CardViews](/community/tutorials/android-recyclerview-android-cardview-example-tutorial) inside a RecyclerView in the form of a GridLayout. Also, we'll implement an interface that makes RecyclerView item click similar to a [ListView](/community/tutorials/android-listview-example-tutorial) itemClickListener. Android GridLayoutManager We've implemented a RecyclerView using a […]

Read more
How to Install Netdata on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Install Netdata on RHEL 9

Netdata is a lightweight, real-time performance monitoring agent that provides per-second metrics with zero configuration for hundreds of applications and services out of the box. Unlike traditional monitoring solutions that poll at 15- or 60-second intervals, Netdata collects data every second and renders interactive charts in its built-in web dashboard instantly. It is designed to […]

Read more
Oracle Linux 8 — webkit2gtk3 security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — webkit2gtk3 security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2022-1777)

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-1777 Related CVEs: CVE-2021-30889 CVE-2022-22637 CVE-2021-30848 CVE-2021-30884 CVE-2021-30890 CVE-2021-30818 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

Read more
Common Problems 121559

Debian 9 Boot Stalls on Emergency Mode

🔴 Critical   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Debian 9 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

Read more
SLES 12 — libspeex1 — vulnerability — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — libspeex1 — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2021:3858-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-23903 Upstream summary: A Divide by Zero vulnerability in the function static int read_samples of Speex v1.2 allows attackers to cause a denial of service […]

Read more
Common Problems 118571

Ubuntu 16.04 LTS – Docker daemon fails to start with overlay2 errors – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Ubuntu 16.04 LTS 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]

Read more
Common Problems 115087

Kernel Panic Risk from Low /boot Free Space During Update

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & Cross-Refs References & Further […]

Read more
Common Problems 115071

RHEL 8 HAProxy Bind Denied by SELinux on Nonstandard Port

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & Cross-Refs References & Further […]

Read more
How to Install Nagios on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install Nagios on Oracle Linux 8

Introduction Oracle Linux 8 ships with a stable, security-hardened base that makes deploying install nagios on oracle linux 8 both straightforward and auditable. This tutorial covers the complete procedure for how to Install Nagios on Oracle Linux 8, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for network-facing services. […]

Read more
Common Problems 114070

RHEL 10 – Cockpit web console fails to load pages due to missing ws packages – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related […]

Read more
CHAT