The Dark Side of Docker: Avoid the “Latest” Tag

We rely on Docker, and it’s one of our favorite technologies. But using Docker for commercial software shows some rough edges that we found the hard way.

Latest Tag Is Broken at Best, Evil at Worst

It seems like the “latest” tag should work, but it really doesn’t, except in the simplest cases. We didn’t realize how crazy broken this could be until one night we were on a Zoom call and watched a new customer install software that was three months old, when there were 10 newer builds available. Not a good feeling.

We’re not the first to recognize there were major things wrong with the latest tag, but we really didn’t see these problems at first. We’ve now gone the other way and removed our “latest” tags from our Docker images. There were a couple of things that put us over the edge.

The “latest” pattern bends or breaks the kind of caching that every CDN wants to do because, over time, this leads to multiple artifacts with the same name but different content. What CDNs really like are immutable artifacts with unique version numbers. What’s really awful is that if the latest tag fails due to this kind of caching, you’ll never know. The latest tag will always resolve to something, even if that something is months old because of some lame caching issue.

#docker

What is GEEK

Buddha Community

The Dark Side of Docker: Avoid the “Latest” Tag

smm captain

1650364405

Best Instagram Hashtags for Reels, Giveaways, Travel, Fashion

Pick the right hash tags and enjoy likes and comments on the post.

Making engaging reels about the travels, fashion, fitness, contest, and more, the results are not satisfactory. All you get is a few likes, comments and nothing else. You need the engagement on your post to bring more business to you. How can you bring interaction to the content? Indeed you can buy real instagram likes uk to get high rates. But how can you make the Instagram world hit the likes button under the post? You need to boost the reach. You must present your content to the right audiences to get higher interaction rates. 

Your Instagram #tags are the power tool that works like magic for influencers and businesses. The blue text with # is the magical option that increases the viability of the posts. The Instagram algorithm keeps on changing, and now the engagement on the post is a must to place the content at a higher place in followers’ feed. For this, you require more likes and comments under the post. For this, you must lift the reach by using perfect tags.

Why are hashtags popular on Instagram?

Let me clear it for you. Do you know how many active users this digital handle has? It is about 2B and more, and the count is changing every day. Each of the followers must be posting something on the handles. Thousands of profit must be of a similar niche as yours. If you are the business and running the clothing brands, then many other companies deal with clothes. So, customers or followers have many choices to choose from. Why would they follow you or purchase from your companies?

Your reply must be that you offer quality material at the best rates. But how does anyone finds out about you? Indeed you can buy active instagram followers uk to bring more fans, but how can you boost the reach of your voices. All businesses must represent their product to the right audiences, but how?

Of course, hashtags.

Table of Contents

Not all Hashtags are for you

There are some basic tags that you can use, but if you are more specific about your approach, choose the relevant tags for your business. Your #tags game must be industry oriented. So in this part, you will learn about the famous tags as per various niches. 

Tags for Travel Niche

Indeed this niche is famous on Instagram, and influencers earn handsome amounts. These #tags are best for you if you possess a similar place. Use them smartly and rightly!

#TravelPhotography

#PicOfTheDay

#NaturePhotography

#TravelBlogger

#beautiful

#landscape

#adventure

#explore

#instatravel

#photo

#trip

#summer

#travelgram

#photography

#art

#travel

#wanderlust

#nature

#instagood

#PhotoOfTheDay

Tags for Fashion Industry

After thee travel next most famous niche is fashion. You can earn handsome amount form it. But for this you need to pick the right tags form the following:

  1. #bhfyp
  2. #smile
  3. #OutfitOfTheDay
  4. #FashionPhotography
  5. #FollowBack
  6. #ootd
  7. #FashionBlogger
  8. #WhatIWore
  9. #follow
  10. #fashionista
  11. #PhotoOfTheDay
  12. #StyleInspo
  13. #instastyle
  14. #love
  15. #CurrentlyWearing
  16. #FashionBlog
  17. #ShoppingAddict
  18. #LookGoodFeelGood
  19. #FashionAddict
  20. #FashionStyle
  21. #BeautyDoesntHaveToBePain
  22. #style
  23. #fashion
  24. #FollowForFollowBack
  25. #fashionable
  26. #l
  27. #PicOfTheDay
  28. #fashiongram

Tags for fitness Influencers

So, what to boost your fitness business then uses these tags and enjoys likes:

  1. #exercise
  2. #bodybuilding
  3. #life
  4. #gymlife
  5. #motivation
  6. #healthy
  7. #lifestyle
  8. #health
  9. #gym
  10. #sport
  11. #training
  12. #workout
  13. #HealthyLifestyle
  14. #muscle
  15. #fit
  16. #CrossFit
  17. #fitness
  18. #FitFam
  19. #goals
  20. #PersonalTrainer
  21. #FitnessMotivation

Best Tags for Giveaway

So, are you arranging the giveaway and want a maximum number of people to participate? If so, then it is time to boost the reach vis using these tags

  1. #giveaway
  2. #sweepstakes
  3. #WinItWednesday
  4. #freebie
  5. #ContestAlert
  6. #ContestEntry
  7. #instacontest
  8. #instagiveaway
  9. #WinIt
  10. #contest
  11. #GiveawayAlert
  12. #giveaway

The popular #tags for Reels

Are you the reels queen, or do you want to become the one? Then these below mentioned tags are for you. But don’t go for all of them because you can use only thirty of them. Pick it smartly!

  1. #ReelsInstagram
  2. #VideoOfTheDay
  3. #ReelsIndia
  4. #ReelSteady
  5. #disney
  6. #ForYouPage
  7. #InstagramReels
  8. #bhfyp
  9. #instareels
  10. #reelsinsta
  11. #fyp
  12. #ReelsOfInstagram
  13. #TikTokIndia
  14. #HolaReels
  15. #reels
  16. #ReelsBrasil
  17. #k
  18. #ReelsVideo
  19. #instareel
  20. #music

#tags for foodie

Do you love to eat and what to share your experience with another foodie on Instagram? If you are visiting any cafe, then before uploading, always add one of the following tags!

  1. #instafood
  2. #FoodBlogger
  3. #lunch
  4. #PicOfTheDay
  5. #instadaily
  6. #FoodPhotography
  7. #PhotoOfTheDay
  8. #food
  9. #healthy
  10. #foodie
  11. #FoodLover
  12. #bhfyp
  13. #instagood
  14. #tasty
  15. #delicious
  16. #foodstagram
  17. #homemade
  18. #cooking
  19. #FoodPorn
  20. #love
  21. #foodgasm
  22. #foodies
  23. #HealthyFood
  24. #dinner
  25. #yummy
  26. #restaurant

How to Pick the proper tags or find the best one for you?

There is a long list of each niche, and you can use all of them. If you are confused about what to pick and whatnot, here is the guide to choosing the perfect tag.

  1. Use the search function. Just mentions a keyword applicable to your content and choose the Tags tab. This handle will then provide you with a hashtags list. Search for relevant #tags with fair usage ( 50K)
  2. Use the tags that others use in your sector.

Study your competition. Review their post and study the tags they are using.

Zachary Palmer

Zachary Palmer

1555901576

CSS Flexbox Tutorial | Build a Chat Application

Creating the conversation sidebar and main chat section

In this article we are going to focus on building a basic sidebar, and the main chat window inside our chat shell. See below.

Chat shell with a fixed width sidebar and expanded chat window

This is the second article in this series. You can check out the previous article for setting up the shell OR you can just check out the chat-shell branch from the following repository.

https://github.com/lyraddigital/flexbox-chat-app.git

Open up the chat.html file. You should have the following HTML.

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>Chat App</title>
    <link rel="stylesheet" type="text/css" media="screen" href="css/chat.css" />
</head>
<body>
    <div id="chat-container">
    </div>
</body>
</html>

Now inside of the chat-container div add the following HTML.

<div id="side-bar">
</div>
<div id="chat-window">
</div>

Now let’s also add the following CSS under the #chat-container selector in the chat.css file.

#side-bar {
    background: #0048AA;
    border-radius: 10px 0 0 10px;
}
#chat-window {
    background: #999;
    border-radius: 0 10px 10px 0;
}

Now reload the page. You should see the following:-

So what happened? Where is our sidebar and where is our chat window? I expected to see a blue side bar and a grey chat window, but it’s no where to be found. Well it’s all good. This is because we have no content inside of either element, so it can be 0 pixels wide.

Sizing Flex Items

So now that we know that our items are 0 pixels wide, let’s attempt to size them. We’ll attempt to try this first using explicit widths.

Add the following width property to the #side-bar rule, then reload the page.

width: 275px;

Hmm. Same result. It’s still a blank shell. Oh wait I have to make sure the height is 100% too. So we better do that too. Once again add the following property to the #side-bar rule, then reload the page.

height: 100%;

So now we have our sidebar that has grown to be exactly 275 pixels wide, and is 100% high. So that’s it. We’re done right? Wrong. Let me ask you a question. How big is the chat window? Let’s test that by adding some text to it. Try this yourself just add some text. You should see something similar to this.

So as you can see the chat window is only as big as the text that’s inside of it, and it is not next to the side bar. And this makes sense because up until now the chat shell is not a flex container, and just a regular block level element.

So let’s make our chat shell a flex container. Set the following display property for the #chat-window selector. Then reload the page.

display: flex;

So as you can see by the above illustration, we can see it’s now next to the side bar, and not below it. But as you can see currently it’s only as wide as the text that’s inside of it.

But we want it to take up the remaining space of the chat shell. Well we know how to do this, as we did it in the previous article. Set the flex-grow property to 1 on the #chat-window selector. Basically copy and paste the property below and reload the page.

flex-grow: 1;

So now we have the chat window taking up the remaining space of the chat shell. Next, let’s remove the background property, and also remove all text inside the chat-window div if any still exists. You should now see the result below.

But are we done? Technically yes, but before we move on, let’s improve things a little bit.

Understanding the default alignment

If you remember, before we had defined our chat shell to be a flex container, we had to make sure we set the height of the side bar to be 100%. Otherwise it was 0 pixels high, and as a result nothing was displayed. With that said, try removing the height property from the #side-bar selector and see what happens when you reload the page. Yes that’s right, it still works. The height of the sidebar is still 100% high.

So what happened here? Why do we no longer have to worry about setting the height to 100%? Well this is one of the cool things Flexbox gives you for free. By default every flex item will stretch vertically to fill in the entire height of the flex container. We can in fact change this behaviour, and we will see how this is done in a future article.

Setting the size of the side bar properly

So another feature of Flexbox is being able to set the size of a flex item by using the flex-basis property. The flex-basis property allows you to specify an initial size of a flex item, before any growing or shrinking takes place. We’ll understand more about this in an upcoming article.

For now I just want you to understand one important thing. And that is using width to specify the size of the sidebar is not a good idea. Let’s see why.

Say that potentially, if the screen is mobile we want the side bar to now appear across the top of the chat shell, acting like a top bar instead. We can do this by changing the direction flex items can flex inside a flex container. For example, add the following CSS to the #chat-container selector. Then reload the page.

flex-direction: column;

So as you can see we are back to a blank shell. So firstly let’s understand what we actually did here. By setting the flex-direction property to column, we changed the direction of how the flex items flex. By default flex items will flex from left to right. However when we set flex-direction to column, it changes this behaviour forcing flex items to flex from top to bottom instead. On top of this, when the direction of flex changes, the sizing and alignment of flex items changes as well.

When flexing from left to right, we get a height of 100% for free as already mentioned, and then we made sure the side bar was set to be 275 pixels wide, by setting the width property.

However now that we a flexing from top to bottom, the width of the flex item by default would be 100% wide, and you would need to specify the height instead. So try this. Add the following property to the #side-bar selector to set the height of the side bar. Then reload the page.

height: 275px;

Now we are seeing the side bar again, as we gave it a fixed height too. But we still have that fixed width. That’s not what we wanted. We want the side bar (ie our new top bar) here to now be 100% wide. Comment out the width for a moment and reload the page again.

So now we were able to move our side bar so it appears on top instead, acting like a top bar. Which as previously mentioned might be suited for mobile device widths. But to do this we had to swap the value of width to be the value of height. Wouldn’t it be great if this size was preserved regardless of which direction our items are flexing.

Try this, remove all widths and height properties from the #side-bar selector and write the following instead. Then reload the page.

flex-basis: 275px;

As you can see we get the same result. Now remove the flex-direction property from the #chat-container selector. Then once again reload the page.

Once again we are back to our final output. But now we also have the flexibility to easily change the side bar to be a top bar if we need to, by just changing the direction items can flow. Regardless of the direction of flex, the size of our side bar / top bar is preserved.

Conclusion

Ok so once again we didn’t build much, but we did cover a lot of concepts about Flexbox around sizing. 

#css #programming #webdev 

Iliana  Welch

Iliana Welch

1595249460

Docker Explained: Docker Architecture | Docker Registries

Following the second video about Docker basics, in this video, I explain Docker architecture and explain the different building blocks of the docker engine; docker client, API, Docker Daemon. I also explain what a docker registry is and I finish the video with a demo explaining and illustrating how to use Docker hub

In this video lesson you will learn:

  • What is Docker Host
  • What is Docker Engine
  • Learn about Docker Architecture
  • Learn about Docker client and Docker Daemon
  • Docker Hub and Registries
  • Simple demo to understand using images from registries

#docker #docker hub #docker host #docker engine #docker architecture #api

The Dark Side of Docker: Avoid the “Latest” Tag

We rely on Docker, and it’s one of our favorite technologies. But using Docker for commercial software shows some rough edges that we found the hard way.

Latest Tag Is Broken at Best, Evil at Worst

It seems like the “latest” tag should work, but it really doesn’t, except in the simplest cases. We didn’t realize how crazy broken this could be until one night we were on a Zoom call and watched a new customer install software that was three months old, when there were 10 newer builds available. Not a good feeling.

We’re not the first to recognize there were major things wrong with the latest tag, but we really didn’t see these problems at first. We’ve now gone the other way and removed our “latest” tags from our Docker images. There were a couple of things that put us over the edge.

The “latest” pattern bends or breaks the kind of caching that every CDN wants to do because, over time, this leads to multiple artifacts with the same name but different content. What CDNs really like are immutable artifacts with unique version numbers. What’s really awful is that if the latest tag fails due to this kind of caching, you’ll never know. The latest tag will always resolve to something, even if that something is months old because of some lame caching issue.

#docker

Docker Architecture Overview & Docker Components [For Beginners]

If you have recently come across the world of containers, it’s probably not a bad idea to understand the underlying elements that work together to offer containerisation benefits. But before that, there’s a question that you may ask. What problem do containers solve?

After building an application in a typical development lifecycle, the developer sends it to the tester for testing purposes. However, since the development and testing environments are different, the code fails to work.

Now, predominantly, there are two solutions to this – either you use a Virtual Machine or a containerised environment such as Docker. In the good old times, organisations used to deploy VMs for running multiple applications.

So, why did they started adopting containerisation over VMs? In this article, we will provide detailed explanations of all such questions.

#docker containers #docker engine #docker #docker architecture