Docker invalid reference format windows

After having problems running ODM with the vagrant variant, I thought I’d give docker a try. Unfortunately I have following problem which I cannot solve:

foo@bar MINGW64 /c/workspace/bellus
$ winpty docker run -it --rm -v $(pwd)/images:/code/images -v $(pwd)/odm_orthophoto:/code/odm_orthophoto -v $(pwd)/odm_georeferencing:/code/odm_georeferencing opendronemap/opendronemap --meshing-size 100000
docker: invalid reference format.
See ‘docker run —help’.

Additional Information

foo@bar MINGW64 /c/workspace/bellus
$ echo $(pwd)
/c/workspace/bellus

foo@bar MINGW64 /c/workspace/bellus
$ ls -al
total 6
drwxr-xr-x 1 foo 1049089 0 May 29 14:13 ./
drwxr-xr-x 1 foo 1049089 0 May 29 14:21 ../
-rw-r—r— 1 foo 1049089 17 May 7 2016 .gitignore
-rw-r—r— 1 foo 1049089 321 May 7 2016 gcp_list.txt
drwxr-xr-x 1 foo 1049089 0 May 29 14:13 images/

$ docker version
Client:
Version: 17.05.0-ce
API version: 1.29
Go version: go1.7.5
Git commit: 89658be
Built: Fri May 5 15:36:11 2017
OS/Arch: windows/amd64

Server:
Version: 17.05.0-ce
API version: 1.29 (minimum version 1.12)
Go version: go1.7.5
Git commit: 89658be
Built: Thu May 4 21:43:09 2017
OS/Arch: linux/amd64
Experimental: false

$ docker info
Containers: 14
Running: 0
Paused: 0
Stopped: 14
Images: 2
Server Version: 17.05.0-ce
Storage Driver: aufs
Root Dir: /mnt/sda1/var/lib/docker/aufs
Backing Filesystem: extfs
Dirs: 70
Dirperm1 Supported: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host macvlan null overlay
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 9048e5e50717ea4497b757314bad98ea3763c145
runc version: 9c2d8d184e5da67c95d601382adf14862e4f2228
init version: 949e6fa
Security Options:
seccomp
Profile: default
Kernel Version: 4.4.66-boot2docker
Operating System: Boot2Docker 17.05.0-ce (TCL 7.2); HEAD : 5ed2840 — Fri May 5 21:04:09 UTC 2017
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 3.858GiB
Name: default
ID: JBPW:BABW:64NT:4PSX:Y6K6:BAT5:K3ZT:34GS:N62P:EKSL:J5I5:K63S
Docker Root Dir: /mnt/sda1/var/lib/docker
Debug Mode (client): false
Debug Mode (server): true
File Descriptors: 16
Goroutines: 22
System Time: 2017-05-29T14:31:44.339328435Z
EventsListeners: 0
Registry: https://index.docker.io/v1/
Labels:
provider=virtualbox
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false

Can anyone help please?

Docker invalid reference format is an error in docker that lets you know that your syntax of the docker container image name is wrong. However, you should not confuse this error with docker being unable to locate your image in the registry.

Картинка с сайта: www.positioniseverything.net

If you get this error docker will not even go as far as looking up your image in the registry. Read on to find out what causes this error and how you can solve it.

Why Am I Getting The Docker Invalid Reference Format Error?

You are triggering this docker invalid reference format error is that the syntax you are using for your docker image is wrong. You will get this error if docker sees something unexpected in the image name. This can be an invalid space or character before any of your options.

Here are some of the most common triggers of this error in docker:

• Ending the name of your docker container image with a colon like this “program:”
• Using a dash (-) at the end of your container image
• Also, if you use a variable like “program:$first” but you have not set “first”
• Using colon more than once in your docker name like this “program:1.10:2”
• Mixing up the order of command line arguments allows another argument to assume the role of your image name.

A closer inspection of this error reveals that the name you supplied as a docker name is invalid. That is to say, the docker name you are providing to the docker command is unacceptable. In Docker, a reference refers to a pointer for an image.

Therefore, whenever you pass the image name in a docker command, it will be parsed. When parsing, one of the things the command will check is if the name follows specific Docker rules. If the image name does not, Docker will trigger the error in question.

Depending on the platform you are using, if you use the wrong syntax in your docker image name, you will trigger this error. Below are some of the variations depending on your operating system and your use:

• docker: invalid reference format windows
• docker: invalid reference format mac
• docker pull invalid reference format
• docker: invalid reference format ubuntu
• docker: invalid reference format pwd
• docker: invalid reference format volume
• docker-compose invalid reference format

– Not Meeting Standard DNS Rules

In docker, the name of an image consists of slash-separated name components and an optional registry hostname. When you include the hostname, it must meet the standard DNS rules. Not meeting the standard of DNS rules results in this error.

Картинка с сайта: www.positioniseverything.net

Including the port number may be optional. If you do not have a hostname, docker usually dockers by default uses its registry.

Docker allows names to contain lowercase letters, separators, and digits. In docker, a separator refers to a period, 1 or 2 dashes, or 1 or 2 underscores. However, your image name cannot begin or end with a separator.

Docker also requires a tag to use valid ASCII. Just like an image name, a tag cannot begin with a dash or period. With docker, it is possible to group images using their name and tags. If you are new to Docker, a tag is a segment that follows the colon in a docker image name. At this point, it is worth pointing out that it is not a must to supply a tag when tagging images.

– Use of Uppercase Letters

Suppose you want to create a docker image by the name sda-docker-Demo and you use the following docker command:

docker build -t sda-docker-Demo

Notice that one character of the image name is in uppercase. If you run this command, the output will be an invalid argument “sda-docker-Demo” for “-t, –tag” docker: invalid reference format: repository name must be lowercase.

As well, if you use the docker run command and include an uppercase character in your image name, you will trigger the same error. Here is how you can use this command in Docker even though doing this with this name will trigger the error:

docker run -p 80:80 sda-docker-Demo

– Use of Special Characters

Now, suppose you want to create a docker image but you want to include special characters to the name. This is now wrong per se. However, if you use these special characters to start or end the name of your docker image, you will trigger the error in question.

Suppose for this example’s sake you want to use a special character at the end of the docker image name. Here is how you can try to build an image in docker whose name has a special character at the end.

docker build -t sda-docker-demo-

How To Solve the Docker Invalid Reference Format Error

You can solve the Docker Invalid Reference Format error by avoiding the use of special characters at the start and end of your docker image names. However, the solution to this error will vary depending on what caused it in the first place.

In the following paragraphs, you will learn the various ways you can solve this error depending on its root cause.

– Solution 1: Avoid Using Uppercase Characters in Docker Image

One of the most important rules when it comes to naming your docker image is to always use lowercase letters without spaces. In this case, if you want to solve the error in your first example that raises from using an uppercase letter, you can accomplish this as follows.

Suppose you want to build a docker image by the name sda-docker-Demo, you can accomplish this by making sure your docker image name is in lowercase and using the following docker command: “docker build -t sda-docker-demo”. Also, you can use the docker run command as follows to accomplish the same thing: “docker run -p 80:80 sda-docker-demo”.

– Solution 2: Be Careful When Splitting Long Docker Commands

In case you find your docker command becoming too long. You can split it into a number of lines. However, you must be careful when using the rules below depending on the shell (cmd, PowerShell, bash/sh) you have in your computer.

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• cmd – the multiline escape character is ^
• powershell – if you are using PowerShell, then use ` as the multiline escape character
• bash/sh – for sh/bash use \ as your multiline escape character

Here is a quick look at how you can accomplish this across various shells. If you are on cmd, here is how you can write a multiline docker command without triggering the reference format error.

If you are on PowerShell, your docker command will look something like this:

Lastly, if you are using sh/bash, your multiline docker command for creating your docker image will look something like this:

– Solution 3: Be Careful When Using ${Pwd} And $(Pwd) Path

In case your docker command utilizes ${pwd} then you must be careful when using ${pwd} and $(pwd) depending on the shell you are using. Below is a quick look at how you can safely use ${pwd} on different shells.

Suppose you are using ${pwd} or $(pwd) on PowerShell then your command will look something like this: “docker run-p 80:80 -v `${pwd}` /../src:/src sda-docker-demo”. However, if you are using sh/bash then here is how you would implement this in your docker command.

docker run-p 80:80 -v `$(pwd)` /../src:/src sda-docker-demo

Conclusion

The docker invalid reference format error is an error you get for not abiding by the conventions of naming a docker image. In this post, you have learned there are various causes of this error and various solutions to it. Here is a quick recap of the guide:

• With docker, failure to stick to the syntax of naming images is the main cause of this error
• One example involves appending special characters at the end or start of a docker image name
• Using uppercase characters in the docker name will trigger this error
• To solve this error, abide by the naming conventions in Docker
• One way is to avoid using uppercase characters in your docker image name

Now that you know the root cause of this error, you can easily pinpoint and solve it whenever your docker commands trigger it.

Введение

Работа с Docker — это мощный способ управления и развертывания приложений в контейнерах. Однако, как и любая другая технология, Docker может вызывать различного рода ошибки и затруднения. Одной из таких ошибок является «invalid reference format», с которой вы можете столкнуться при попытке работы с Docker-образами или контейнерами. В этой статье мы разберем природу этой ошибки, её распространённые причины и способы устранения.

Что такое «invalid reference format»?

В Docker, ссылка на образ (reference) должна соответствовать определенному формату. Эта ссылка включает в себя имя образа, его версию и иногда репозиторий, из которого образ должен быть загружен. Ошибка «invalid reference format» возникает тогда, когда Docker не может распознать указанный вами формат образа.

Причины возникновения ошибки

Недопустимые символы

Наиболее распространённая причина возникновения ошибки «invalid reference format» — это использование недопустимых символов в названии образа. Docker строго контролирует, какие символы могут присутствовать в имени образа. Например, он допускает только строчные буквы, цифры и некоторые специальные символы, такие как тире и точки.

Пример

Рассмотрим пример, где мы ошиблись в имени образа:

docker pull my_repo/my:image

В этом случае двоеточие в имени образа приводит к ошибке формата.

Пропущенные части имени образа

Еще одна часто встречающаяся причина — пропуск некоторых частей ссылки на образ. Например, вы могли забыть указать тег образа. Если тег не указан, Docker пытается использовать тег latest по умолчанию. Однако при определённых условиях отсутствие тега может вызывать ошибку.

Пример

docker run my_repo/myimage

Если образ my_repo/myimage не существует без тега, это может привести к проблеме. Лучше указывать всегда точный тег:

docker run my_repo/myimage:1.0

Неверный синтаксис

Любая ошибка в синтаксисе команды может также вызывать эту ошибку. Это может включать лишние пробелы, ошибки в командах или параметрах.

Пример

docker pull my_repo/myimage :latest

В этом примере пробел перед двоеточием создаёт проблему. Правильный формат:

docker pull my_repo/myimage:latest

Способы устранения ошибки

Проверка названия образа

Первое, с чего стоит начать, это сверка названия образа и приведение его к допустимому виду. Используйте только допустимые символы и исправьте любые синтаксические ошибки.

Явное указание тега

Если проблема кроется в отсутствии тега, всегда указывайте его явно. Это не только помогает избежать ошибок, но и обеспечивает использование конкретной версии образа:

docker run my_repo/myimage:1.0

Использование репозиториев

Когда вы используете образы из Docker Hub или иных регистраторов, убедитесь, что они размещены в правильном репозитории. Использование некорректного репозитория также вызывает проблемы с форматом.

Утилиты и расширенные инструменты

Для более сложных сценариев, есть инструменты, которые могут помочь автоматически проверять и исправлять ссылки на образы. Эти инструменты могут быть полезны в больших проектах с множеством связанных зависимостей.

Заключение

Ошибка «invalid reference format» в Docker может стать раздражающим препятствием в работе с контейнерами и образами, но она легко устраняется при внимательном подходе и понимании требований Docker к синтаксису ссылок. Проверка правильности названия образа, его репозитория и тега минимизируют риск возникновения этой ошибки. Надеемся, что приведённые примеры и советы помогут вам избежать подобных проблем в будущем.

Have you ever encountered the ‘Docker Invalid Reference Format’ error message, leaving you puzzled and frustrated? If so, you’ve landed on the right page.

This blog post will guide you through the common triggers of this Docker error and, more importantly, how to rectify it.

We aim to help you comprehend the Docker Invalid Reference Format error, its causes, and provide in-depth solutions to get you back on track. Let’s dive in!

TL;DR: What is Docker Invalid Reference Format Error

The Docker Invalid Reference Format error generally occurs when Docker fails to correctly interpret the syntax of your Docker image name. The image name plays a crucial role as Docker uses it to locate and pull the appropriate image from the Docker registry. If this name is not formatted correctly, Docker responds with an ‘invalid reference format’ error.

Example of an image name with incorrectly encoded hyphen:

docker pull my–image

In the command above, ‘my–image’ is not a valid image name because it contains an incorrectly encoded hyphen.

Example of an image name not adhering to standard DNS rules:

docker pull my_Image

In the command above, ‘my_Image’ is not a valid image name because it contains an uppercase letter.

Understanding Docker Invalid Reference Format Error

It’s important to distinguish this error from Docker’s inability to locate your image in the registry. The latter usually occurs when the image doesn’t exist in the registry, or an incorrect image name has been provided.

However, the ‘invalid reference format’ error specifically points to a syntax issue in the image name.

Example of an incorrectly formatted Docker image name:

docker pull Ubuntu:Latest

In the command above, ‘Ubuntu:Latest’ is not a valid image name because it contains uppercase letters.

Several common triggers can lead to this error. These include not adhering to standard DNS naming rules, using uppercase letters, and incorporating special characters in the image name.

Docker follows a specific process to parse image names, and if it encounters an unfamiliar character or string, it returns this error.

Common Causes of Docker Invalid Reference Format Error

Grasping Docker’s naming conventions is key to avoiding such errors. Docker image names must be valid ASCII and must comply with standard DNS naming rules. This requires them to be lowercase and consist only of numbers, hyphens, periods, and underscores.

By sticking to these conventions, you can avert the Docker Invalid Reference Format error and ensure the smooth operation of your Docker containers.

Standard DNS Rules: The Essential Guide

The Docker Invalid Reference Format error often arises when standard DNS rules are overlooked while naming Docker images. Docker image names need to be valid ASCII and should comply with DNS naming conventions.

They should be in lowercase and consist only of numbers, hyphens, periods, and underscores. If your image name fails to meet these criteria, Docker throws an ‘invalid reference format’ error.

The Impact of Uppercase Letters

Using uppercase letters in your Docker image name can also trip the ‘invalid reference format’ error. Docker image names are case-sensitive and must be in lowercase. If uppercase letters are used, Docker fails to recognize the image name, resulting in an error.

Example of an image name with uppercase letters:

docker pull MyImage

In the command above, ‘MyImage’ is not a valid image name because it contains uppercase letters.

Special Characters: Use with Caution

The inclusion of special characters in your Docker image name can lead to the ‘invalid reference format’ error. Docker only recognizes numbers, hyphens, periods, and underscores in image names.

The use of any other special characters can lead to Docker failing to parse the image name and throwing an error.

Example of an image name with special characters:

docker pull my@image

In the command above, ‘my@image’ is not a valid image name because it contains a special character ‘@’.

The Copy-Pasting Conundrum: Encoding Mishaps

Encoding mishaps during the copy-pasting process, especially with hyphens, is another common cause of this error. If a hyphen is encoded incorrectly during copy-pasting, Docker may fail to recognize it, resulting in an ‘invalid reference format’ error.

Docker naming conventions use separators like hyphens, periods, and underscores to differentiate between different parts of the image name. If these separators are encoded incorrectly, Docker may fail to correctly parse the image name, leading to the ‘invalid reference format’ error.

Operating System: A Potential Pitfall

The operating system you’re using can also influence the occurrence of this error. Some operating systems may have different default encoding settings, which can lead to errors when copy-pasting Docker commands or image names.

It’s always advisable to double-check your Docker commands and image names for any potential encoding issues before running them.

Solutions to Docker Invalid Reference Format Error

Having understood the common causes of the Docker Invalid Reference Format error, let’s explore some practical solutions to resolve it.

Lowercase Characters: A Simple Solution

As previously discussed, Docker image names are case-sensitive and must be in lowercase. If you’ve used uppercase letters in your Docker image name, rectifying the error is as simple as changing them to lowercase. For instance, if your Docker image name is ‘MyImage’, alter it to ‘myimage’.

Splitting Long Docker Commands: A Word of Caution

Working with long Docker commands often necessitates splitting them across multiple lines for better readability. However, if not executed correctly, this can trigger the ‘invalid reference format’ error. When splitting Docker commands, make sure that each command and its corresponding arguments are on the same line. For instance:

docker run -d -p 8080:80 --name mycontainer \
myimage

In the command above, the ‘\’ at the end of the line signals Docker that the command continues on the next line.

Using ${Pwd} and $(Pwd) Path: Beware of Potential Errors

When using the ${Pwd} or $(Pwd) path in your Docker commands, bear in mind that these paths can sometimes trigger the ‘invalid reference format’ error. This happens because these paths are expanded by the shell before Docker parses the command.

If the expanded path contains any characters that Docker doesn’t recognize, it will throw an error. To prevent this, always check the expanded path for any potential issues before executing the command.

Manual Correction of Hyphens, Slashes, and Colons

As highlighted earlier, encoding mishaps with hyphens, slashes, and colons can cause the ‘invalid reference format’ error. Different characters can sometimes look identical! Therefore the name may look valid, but actually contains special characters.

If you suspect this to be the case, try manually correcting these characters in your Docker command or image name. For instance, if you’ve copied a Docker command from a website or document, consider deleting and manually typing the hyphens, slashes, and colons to ensure they’re correctly encoded.

MultiLine commands

In addition to these solutions, knowing how to write multiline Docker commands without triggering the reference format error can be highly beneficial. This involves correctly using the ‘\’ character to indicate that the command continues on the next line, and ensuring that each command and its arguments are on the same line.

Shell Compatibility

Lastly, it’s worth noting that the shell you’re using can influence the way you write Docker commands. Different shells may interpret and expand variables and paths in Docker commands differently, potentially leading to the ‘invalid reference format’ error. Understanding the nuances of your shell, and how it interacts with Docker, can help you avoid this error.

Docker Commands and Variables: A Closer Look

Gaining a deeper understanding of Docker commands and variables can be instrumental in preventing the ‘invalid reference format’ error. Docker commands often incorporate variables, such as $VERSION, within the image name. If these variables are not correctly set or unset, Docker may return an ‘invalid reference format’ error.

For instance, let’s examine the following Docker command:

docker pull ubuntu:$VERSION

In this command, $VERSION is a variable that represents the version of the Ubuntu image you intend to pull. If $VERSION is not set, Docker will attempt to pull an image named ‘ubuntu:’, which is not a valid image name and will result in an ‘invalid reference format’ error.

To circumvent this, ensure that all variables in your Docker commands are correctly set. For instance, you could set $VERSION to ‘latest’ to pull the latest version of the Ubuntu image, or to ‘18.04’ to pull a specific version.

VERSION=latest
docker pull ubuntu:$VERSION

In the command above, $VERSION is set to ‘latest’, meaning Docker will pull the latest version of the Ubuntu image.

Arguments Lead to Fights

Another common pitfall is that Docker commands can misinterpret arguments as the image name if the order of command line arguments is incorrect. For example, consider the following command:

docker run ubuntu:latest -d -p 8080:80 --name mycontainer

In this command, Docker will attempt to run an image named ubuntu:latest -d -p 8080:80 --name mycontainer, which is not a valid image name and will result in an ‘invalid reference format’ error.

The correct order of arguments should be:

docker run -d -p 8080:80 --name mycontainer ubuntu:latest

By paying meticulous attention to the syntax and order of arguments in your Docker commands, and ensuring that all variables are correctly set, you can significantly reduce the likelihood of encountering the ‘invalid reference format’ error, ensuring the smooth operation of your Docker containers.

Recap and Conclusion

Let’s quickly revisit what we’ve covered in this comprehensive guide. We’ve delved into the Docker Invalid Reference Format error, its common causes, and provided in-depth solutions to resolve it. We’ve also emphasized the importance of understanding Docker’s naming conventions and how they play a pivotal role in preventing such errors.

We’ve also explored Docker commands and variables, and how they can influence the occurrence of this error. By paying careful attention to the syntax and order of arguments in your Docker commands, and ensuring that all variables are correctly set, you can significantly reduce the likelihood of encountering this error.

In the long haul, understanding and resolving Docker errors like the Docker Invalid Reference Format error can enhance your proficiency with Docker, improve your problem-solving skills, and make you a more effective developer or system administrator. So, the next time you encounter this error, don’t view it as a roadblock, but as an opportunity to learn and grow.

Remember, the key to mastering Docker is understanding its nuances, including its errors. So, keep learning and keep growing!