Common Docker Problems and Solutions
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Presentation at Docker Singapore (http://www.meetup.com/Docker-Singapore/) about Docker problems and solutions in stability and security.
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Watch the video here: http://bit.ly/1tFiTDM
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- In need of an awesome development environment;
- Interested in learning what's inside the black box of Linux;
- OCD about having a perfectly configured setup; or
- Building an embedded, minimal system or a high-performance cluster.
If there's interest, I can also talk about future developments on the horizon for Gentoo, package management in general, etc.
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ExpoQA 2017 Using docker to build and test in your laptop and Jenkins
This document discusses using Docker to build and test applications in laptops and Jenkins. It begins with an introduction to the author and their background/expertise. It then covers virtualization and containers, including VirtualBox, Vagrant, and Docker. The main concepts of Docker like images, containers, registries are defined. Hands-on examples are provided for running basic Docker commands, managing the lifecycle of containers, exposing network services, and managing Docker images. Building a simple Python web application image is demonstrated as a first example of creating a custom Docker image.
Why you need a private container image registry SCALE 2019
This document discusses using Harbor as a private container registry to manage container images across development, testing, staging and production environments. It recommends pushing images to Harbor from development and pulling those authenticated, signed images into subsequent environments to ensure consistency. Harbor also enables content trust, access control and image vulnerability scanning. The document provides examples of configuring Kubernetes to pull private images from Harbor using imagePullSecrets.
Hooking Docker With Selenium
Docker allows packaging an application and its dependencies into a standardized unit for software development. This document discusses using Docker with Selenium to run automated UI tests. It provides commands for running Docker, describes downloading Selenium images and running a grid/nodes. A demo project shows connecting tests to a Dockerized grid. Challenges include legacy apps with dependencies and latency issues for some Docker commands when using Boot2Docker on Windows/Mac instead of Linux.
Docker London: Container Security
This document summarizes a presentation on container security given by Phil Estes. It identifies several threat vectors for containers including risks from individual containers, interactions between containers, external attacks, and application security issues. It then outlines various security tools and features in Docker like cgroups, Linux Security Modules, capabilities, seccomp, and user namespaces that can help mitigate these threats. Finally, it discusses some future directions for improving container security through more secure defaults, image signing, and network security enhancements.
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Creating and managing environments for development and R&D activities can be cumbersome. Quickly spinning up databases and web servers, using physical resources in a smart way, installing application components, and having all the elements talk to each other can take a lot of time. This session takes you by the hand and introduces you to Vagrant and Oracle VM VirtualBox for quickly provisioning VMs in which Docker containers run platform components, applications, and microservices—all set up by use of Puppet and interacting with Git(Hub). You’ll start from zero on your laptop and end with both local and public cloud environments in which to develop, test, and run various types of applications. Lean governance and evolution of the environments are discussed too.
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5th LF Energy Power Grid Model Meet-up Slides
5th Power Grid Model Meet-up
It is with great pleasure that we extend to you an invitation to the 5th Power Grid Model Meet-up, scheduled for 6th June 2024. This event will adopt a hybrid format, allowing participants to join us either through an online Mircosoft Teams session or in person at TU/e located at Den Dolech 2, Eindhoven, Netherlands. The meet-up will be hosted by Eindhoven University of Technology (TU/e), a research university specializing in engineering science & technology.
Power Grid Model
The global energy transition is placing new and unprecedented demands on Distribution System Operators (DSOs). Alongside upgrades to grid capacity, processes such as digitization, capacity optimization, and congestion management are becoming vital for delivering reliable services.
Power Grid Model is an open source project from Linux Foundation Energy and provides a calculation engine that is increasingly essential for DSOs. It offers a standards-based foundation enabling real-time power systems analysis, simulations of electrical power grids, and sophisticated what-if analysis. In addition, it enables in-depth studies and analysis of the electrical power grid’s behavior and performance. This comprehensive model incorporates essential factors such as power generation capacity, electrical losses, voltage levels, power flows, and system stability.
Power Grid Model is currently being applied in a wide variety of use cases, including grid planning, expansion, reliability, and congestion studies. It can also help in analyzing the impact of renewable energy integration, assessing the effects of disturbances or faults, and developing strategies for grid control and optimization.
What to expect
For the upcoming meetup we are organizing, we have an exciting lineup of activities planned:
-Insightful presentations covering two practical applications of the Power Grid Model.
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
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How does your privacy program stack up against your peers? What challenges are privacy teams tackling and prioritizing in 2024?
In the fifth annual Global Privacy Benchmarks Survey, we asked over 1,800 global privacy professionals and business executives to share their perspectives on the current state of privacy inside and outside of their organizations. This year’s report focused on emerging areas of importance for privacy and compliance professionals, including considerations and implications of Artificial Intelligence (AI) technologies, building brand trust, and different approaches for achieving higher privacy competence scores.
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Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind für viele in der HCL-Community seit letztem Jahr ein heißes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und Lizenzgebühren zu kämpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen!
Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
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https://www.wask.co/ebooks/digital-marketing-trends-in-2024
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Common Docker Problems and Solutions
- 1. Common Docker Problems and Solutions Joel Chen LinkedIn: http://lnkd.in/bwwnBWR GitHub: https://github.com/joelchen
- 2. Stability: Problems š Memory leak: $ free -h total used free shared buffers cached Mem: 995M 961M 33M 480K 57M 252M -/+ buffers/cache: 961M 0M Swap: 1.0G 1.0G 0M š Dependencies not included in official Docker images (e.g. OpenJDK missing libfontconfig1: https://github.com/docker-library/openjdk/issues/46) š Filesystem error: create/symlink failed, no inodes free
- 3. Stability: Solutions š Prevent problems by logging, monitoring, and testing š Prevent multiple containers from using the same port š Upgrade to latest version of Docker š File issue in the official Docker image repository in GitHub, and other issue trackers related to the problem š Use workaround until issue is resolved (e.g. older version of official Docker image with dependencies included) š Select a stable storage driver and filesystem
- 5. Security: Problems š Common security concerns (exploits, attacks, threats) š Sharing secrets using environment variables (exposed in many places) š In Docker 1.7 and below, Docker is vulnerable to image forgery and replay attacks š In Docker 1.9 and below, processes running as root (UID 0) in a container has root-level privileges on the underlying host when interacting with the kernel š Vulnerable Docker images
- 6. Security: Problems Official Images with Vulnerabilities General Images with Vulnerabilities http://www.banyanops.com/blog/analyzing-docker-hub/
- 7. Security: Solutions š Security practices (encryption, monitoring, access control, inbound/outbound filtering, logging, backup, patching, verifying authenticity, policy, training) š Pass secrets in volumes, or in key-value stores (etcd, Vault, Keywhiz) š Mount the container's root filesystem as read only whenever possible (mount tmpfs directories if required) docker run -d --read-only --tmpfs /run --tmpfs /tmp IMAGE š Upgrade to latest version of Docker (Docker 1.8 introduced Docker Content Trust, and Docker 1.10 introduced Seccomp Profiles, User Namespaces, Authorization Plugins) š Use and periodically update to the latest version of images š Use minimal base images (scratch, busybox, alpine) and USER instruction to build custom Docker images whenever possible š Security tools, especially Docker Bench for Security (https://dockerbench.com/), and others (https://www.alfresco.com/blogs/devops/2015/12/03/docker-security-tools-audit-and- vulnerability-assessment/)
- 8. Thank You Joel Chen LinkedIn: http://lnkd.in/bwwnBWR GitHub: https://github.com/joelchen