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Troubleshooting, logs, and known issues. For more about using client and server side certificates, see Adding TLS certificates in the Getting Started topic. Volume mounting requires file sharing for any project directories outside of /Users. If you are using mounted volumes and get runtime errors indicating an application file is not found, access to a volume mount is denied, or a service. How to fix wifi problems by uninstalling and re-install of wifi module in os x. Fix installation problems, using OS X Combo updates. Other Mac startup problems are triggered by OS X updates that went wrong. OS X update failure usually happens when a power hiccup or a power outage occurs during the installation process. The result could be a corrupted system that does not boot or a system that is unstable. Tragamonedas en espanol.
When your Mac does not start up, there could be a multitude of issues behind it. For that reason, we came up with these top 10 troubleshooting tips for a Mac to help resolve any problems.
While most of us are fortunate enough to experience trouble-free years, working every day without issues, others run into problems keeping them from using their Macs. Well, if a Mac does not start up, that does not necessarily mean you can’t do anything about it. Yes, it can be a disaster, especially if you have a deadline to meet. But again, these Mac troubleshooting tips should help you diagnose the problem and fix it, or at least, prepare you ahead for any problems.
1. Use Mac’s Safe Boot Option.
One of the easiest and most straightforward methods to diagnose startup problems with Macs is to use the Safe Boot option. This method technically forces a Mac to start up with only the most important apps and programs required for startup. It scans your startup drive to make sure that everything is ready for booting.
Follow the steps below to safe boot your Mac:
Pro Tip: Scan your Mac for performance issues, junk files, harmful apps, and security threats
that can cause system issues or slow performance.
Special offer. About Outbyte, uninstall instructions, EULA, Privacy Policy.
- Shut down your Mac.
- Turn it on by pressing the Power button and holding the Shift key.
- Wait for the Apple logo to appear.
- Once the login window shows up, you may release the Shift key and enter your login credentials.
- Sometimes, you will be asked to log in twice, especially if you enabled
2. Reset your Mac’s NVRAM or PRAM.
A PRAM or Parameter Random Access Memory holds the information needed for your Mac’s configuration, including the time and date, volume, mouse, desktop, and other control settings. Since it is powered by a tiny battery, most of the configurations won’t be deleted even if you turn off your Mac.
Now, there are times when a Mac does not start up because there is a problem with the NVRAM or PRAM. To fix it, you simply have to reset it. Here’s how:
- Switch off your Mac.
- Press the power button while pressing the Option, Command, P, and R Hold them until the startup sound is heard twice.
- Release the keys.
- That’s it. You have successfully reset your Mac’s NVRAM.
3. Reset your Mac’s System Management Controller.
Most of your Mac’s basic hardware functions are controlled by the System Management Controller. That includes thermal management, how the power button works, and managing sleep mode. In cases when a Mac does not finish starting up or freezes while in the process of starting, sometimes, resetting the SMC fixes the problem.
To reset Mac’s SMC, follow these steps:
- Go to the Apple menu and hit Shut Down.
- Unplug your Mac’s power cord and wait for 15 seconds before plugging it back in.
- Wait for 5 more seconds and press the Power button.
- You have successfully reset your Mac’s SMC.
4. Reselect your Mac’s startup disk.
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If you see the dreaded flashing question mark on your screen while your Mac is starting up, you might have to reselect a startup disk under System Preferences. To do that, here’s what you should do:
- Open the Apple menu and choose System Preferences.
- Click Startup Disk.
- Select the icon of the disk you normally use when starting up your Mac. It’s often named Macintosh HD.
- Your Mac should now restart normally without the flashing question mark.
5. Disconnect all your Mac’s external peripherals.
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The startup process of a Mac is indeed unpredictable. After pushing the Power button, sometimes, you’d see a gray screen. If your Mac gets stuck at the gray screen, know that there’ll be a bit of work ahead of you. However, one of the best ways to avoid this issue is to disconnect all your external peripherals. Here’s how:
- Press and hold the Power button to force shut down your Mac.
- Disconnect all the external peripherals connected to your Mac, excluding the display, mouse, and keyboard. Make sure you disconnect the headphones, audio in or out cables, and Ethernet cable.
- Restart your Mac.
6. Repair blue screen problems.
If you turn on your Mac and you get stuck at the blue screen, chances are, your startup drive might be having issues. Often, they can be fixed with Apple’s Disk Utility, but you can also use third-party apps, such as TechTool Pro, DiskWarrior, or Drive Genius. Since you won’t be able to start up your Mac successfully, you might need to boot from another drive or from a DVD install disk.
7. Fix hard drive issues.
Some startup problems are caused by drives that require minor repairs. To get a Mac with a damaged hard drive up and running again, you have to repair the drive, using third-party software. You can browse the web for software or tools you can use to diagnose and repair the hard drive.
8. Create another user account to use in troubleshooting startup problems.
Creating another user account that has admin access can help diagnose and troubleshoot Mac startup problems. The primary reason for creating a spare account is to have a unique set of extensions, user files, and preferences that could be loaded at startup. Just be sure you create an account before the problem occurs.
9. Use Mac startup keyboard shortcuts.
By using Mac startup keyboard shortcuts, you can change your Mac’s default behavior when starting up. You may start up using special modes, such as Single-User or Safe mode, both of which are handy for troubleshooting. With these shortcuts, you can also ask your Mac to guide you through the startup process so you will know which particular step it is failing.
10. Fix installation problems, using OS X Combo updates.
Other Mac startup problems are triggered by OS X updates that went wrong. OS X update failure usually happens when a power hiccup or a power outage occurs during the installation process. The result could be a corrupted system that does not boot or a system that is unstable.
Which troubleshooting tip works best?
Though Macs are known for their quality and stability, they are still computers, which means they are susceptible to errors and problems. Now, whatever it is that prevents your Mac from starting up correctly, these 10 troubleshooting tips should help get it working again. It does not matter which tip you use. As long as you follow it correctly, then any startup issue won’t stand a chance.
While it does not actually get rid of Mac startup problems, installing Outbyte Mac Repair on your computer will make a difference. Not only will it improve your Mac’s performance, it will also keep your Mac free from junk files that may cause it to slow down and trigger other problems.
See more information about Outbyte and uninstall instructions. Please review EULA and Privacy Policy.
Estimated reading time: 16 minutes
Did you know that Docker Desktop now offers support for developers subscribed to a Pro or a Team plan? Click here to learn more.
This page contains information on how to diagnose and troubleshoot Docker Desktop issues, request Docker Desktop support (Pro and Team plan users only), send logs and communicate with the Docker Desktop team, use our forums and Success Center, browse and log issues on GitHub, and find workarounds for known problems.
Troubleshoot
Choose > Troubleshootfrom the menu bar to see the troubleshoot options.
The Troubleshoot page contains the following options:
Restart Docker Desktop: Select to restart Docker Desktop.
Support: Developers on Pro and Team plans can use this option to send a support request. Other users can use this option to diagnose any issues in Docker Desktop. For more information, see Diagnose and feedback and Support.
Reset Kubernetes cluster: Select this option to delete all stacks and Kubernetes resources. For more information, see Kubernetes.
Clean / Purge data: This option resets all Docker data without areset to factory defaults. Selecting this option results in the loss of existing settings.
Reset to factory defaults: Choose this option to reset all options onDocker Desktop to their initial state, the same as when Docker Desktop was first installed.
Uninstall: Choose this option to remove Docker Desktop from yoursystem.
Uninstall Docker Desktop from the command line
To uninstall Docker Desktop from a terminal, run: <DockerforMacPath>--uninstall
. If your instance is installed in the default location, thiscommand provides a clean uninstall:
You might want to use the command-line uninstall if, for example, you find thatthe app is non-functional, and you cannot uninstall it from the menu.
Diagnose and feedback
In-app diagnostics
If you encounter problems for which you do not find solutions in thisdocumentation, on Docker Desktop issues onGitHub, or the Docker Desktop forum, we can help you troubleshootthe log data. Before reporting an issue, we recommend that you read the information provided on this page to fix some common known issues.
Note
Docker Desktop offers support for users subscribed to a Pro or a Team plan. If you are experiencing any issues with Docker Desktop, follow the instructions in this section to send a support request to Docker Support.
Before you get started, we recommend that you sign into your Docker Desktop application and your Docker Hub account.
- Choose > Troubleshoot.
- Sign into Docker Desktop. In addition, ensure you are signed into your Docker account.
- Click Get support. This opens the in-app Support page and starts collecting the diagnostics.
- When the diagnostics collection process is complete, click Upload to get a Diagnostic ID.
- When the diagnostics have been uploaded, Docker Desktop prints a diagnostic ID. Copy this ID.
- If you have subscribed to a Pro or a Team plan, click Contact Support. This opens the Docker Desktop support form. Fill in the information required and add the ID you copied earlier to the Diagnostics ID field. Click Submit to request Docker Desktop support.
Note
You must be signed in to Docker Desktop using your Pro or Team plan credentials to access the support form. For information on what’s covered as part of Docker Desktop support, see Support.
- If you are not subscribed to a Pro or a team plan, you can click Upgrade to benefit from Docker Support to upgrade your existing account. Alternatively, click Report a Bug to open a new Docker Desktop issue on GitHub. This opens Docker Desktop for Mac on GitHub in your web browser in a ‘New issue’ template. Complete the information required and ensure you add the diagnostic ID you copied earlier. Click submit new issue to create a new issue.
Diagnosing from the terminal
In some cases, it is useful to run the diagnostics yourself, for instance, ifDocker Desktop cannot start.
First, locate the com.docker.diagnose
tool. If you have installed Docker Desktop in the Applications directory, then it is located at/Applications/Docker.app/Contents/MacOS/com.docker.diagnose
.
To create and upload diagnostics, run:
After the diagnostics have finished, you should have the following output,containing your diagnostics ID:
The diagnostics ID (here BE9AFAAF-F68B-41D0-9D12-84760E6B8740/20190905152051) iscomposed of your user ID (BE9AFAAF-F68B-41D0-9D12-84760E6B8740) and a timestamp(20190905152051). Ensure you provide the full diagnostics ID, and not just the user ID.
To view the contents of the diagnostic file, run:
Check the logs
In addition to using the diagnose and feedback option to submit logs, you canbrowse the logs yourself.
In a terminal
To watch the live flow of Docker Desktop logs in the command line, run the following script from your favorite shell.
Alternatively, to collect the last day of logs (1d
) in a file, run:
In the Console app
Macs provide a built-in log viewer, named “Console”, which you can use to checkDocker logs.
The Console lives in /Applications/Utilities
; you can search for it withSpotlight Search.
To read the Docker app log messages, type docker
in the Console window search bar and press Enter. Then select ANY
to expand the drop-down list next to your docker
search entry, and select Process
.
You can use the Console Log Query to search logs, filter the results in variousways, and create reports.
Troubleshooting
Make sure certificates are set up correctly
Docker Desktop ignores certificates listed under insecure registries, and doesnot send client certificates to them. Commands like docker run
that attempt topull from the registry produces error messages on the command line, for example:
As well as on the registry. For example:
For more about using client and server side certificates, seeAdding TLS certificates in the Getting Started topic. Find free slot games.
Volume mounting requires file sharing for any project directories outside of /Users
If you are using mounted volumes and get runtime errors indicating anapplication file is not found, access to a volume mount is denied, or a servicecannot start, such as when using Docker Compose,you might need to enable file sharing.
Volume mounting requires shared drives for projects that live outside of the/Users
directory. Go to >Preferences > Resources > File sharing and share the drive that contains the Dockerfile and volume.
Incompatible CPU detected
Docker Desktop requires a processor (CPU) that supports virtualization and, morespecifically, the Apple Hypervisorframework.Docker Desktop is only compatible with Mac systems that have a CPU that supports the Hypervisor framework. Most Macs built in 2010 and later support it,as described in the Apple Hypervisor Framework documentation about supported hardware:
Generally, machines with an Intel VT-x feature set that includes Extended PageTables (EPT) and Unrestricted Mode are supported.
To check if your Mac supports the Hypervisor framework, run the following command in a terminal window.
If your Mac supports the Hypervisor Framework, the command printskern.hv_support: 1
.
If not, the command prints kern.hv_support: 0
.
See also, Hypervisor FrameworkReferencein the Apple documentation, and Docker Desktop Mac system requirements.
Workarounds for common problems
If Docker Desktop fails to install or start properly on Mac:
Make sure you quit Docker Desktop before installing a new version of theapplication ( > Quit Docker Desktop). Otherwise, you get an “application in use” error when you try tocopy the new app from the
.dmg
to/Applications
.Restart your Mac to stop / discard any vestige of the daemon running fromthe previously installed version.
Run the uninstall commands from the menu.
If
docker
commands aren’t working properly or as expected, you may need tounset some environment variables, to make sure you are not using the legacyDocker Machine environment in your shell or command window. Unset theDOCKER_HOST
environment variable and related variables. If you use bash, use the following command:unset ${!DOCKER_*}
For the
hello-world-nginx
example, Docker Desktop must be running to get tothe web server onhttp://localhost/
. Make sure that the Docker icon isdisplayed on the menu bar, and that you run the Docker commands in a shell that is connected to the Docker Desktop Engine.Otherwise, you might start the webserver container but get a “web page notavailable” error when you go tolocalhost
.If you see errors like
Bind for 0.0.0.0:8080 failed: port is alreadyallocated
orlisten tcp:0.0.0.0:8080: bind: address is already in use
:These errors are often caused by some other software on the Mac using thoseports.
Run
lsof -i tcp:8080
to discover the name and pid of the other process anddecide whether to shut the other process down, or to use a different port inyour docker app.
Known issues
The following issues are seen when using the
virtualization.framework
experimental feature:Some VPN clients can prevent the VM running Docker from communicating with the host, preventing Docker Desktop starting correctly. See docker/for-mac#5208.
This is an interaction between
vmnet.framework
(as used byvirtualization.framework
in Big Sur) and the VPN clients.Docker Desktop is incompatible with macOS Internet Sharing. See docker/for-mac#5348.
This is an interaction between
vmnet.framework
(as used byvirtualization.framework
in Big Sur) and macOS Internet Sharing. At the moment it is not possible to use Docker Desktop and macOS Internet Sharing at the same time.Some container disk I/O is much slower than expected. See docker/for-mac#5389. Disk flushes are particularly slow due to the need to guarantee data is written to stable storage on the host.
This is an artifact of the new
virtualization.framework
in Big Sur.TCP and UDP port 53 (DNS) are bound on the host when Docker Desktop starts. Therefore you cannot bind to port 53 on all interfaces with a command like
docker run -p 53:53
. See docker/for-mac#5335.This is an artifact of the new
virtualization.framework
in Big Sur. A workaround is to bind to a specific IP address e.g.docker run -p 127.0.0.1:53:53
.The Linux Kernel may occasionally crash. Docker now detects this problem and pops up an error dialog offering the user the ability to quickly restart Linux.
We are still gathering data and testing alternate kernel versions. Battlestar galactica slot.
IPv6 is not (yet) supported on Docker Desktop.
You might encounter errors when using
docker-compose up
with Docker Desktop(ValueError: Extra Data
). We’ve identified this is likely related to dataand/or events being passed all at once rather than one by one, so sometimesthe data comes back as 2+ objects concatenated and causes an error.Force-ejecting the
.dmg
after runningDocker.app
from it can cause thewhale icon to become unresponsive, Docker tasks to show as not responding inthe Activity Monitor, and for some processes to consume a large amount of CPUresources. Reboot and restart Docker to resolve these issues.Docker does not auto-start on login even when it is enabled in > Preferences. This is related to aset of issues with Docker helper, registration, and versioning.
Docker Desktop uses the
HyperKit
hypervisor(https://github.com/docker/hyperkit) in macOS 10.10 Yosemite and higher. Ifyou are developing with tools that have conflicts withHyperKit
, such asIntel Hardware Accelerated Execution Manager(HAXM),the current workaround is not to run them at the same time. You can pauseHyperKit
by quitting Docker Desktop temporarily while you work with HAXM.This allows you to continue work with the other tools and preventHyperKit
from interfering.If you are working with applications like ApacheMaven that expect settings for
DOCKER_HOST
andDOCKER_CERT_PATH
environment variables, specify these to connect to Dockerinstances through Unix sockets. For example:There are a number of issues with the performance of directories bind-mountedinto containers. In particular, writes of small blocks, and traversals of largedirectories are currently slow. Additionally, containers that perform largenumbers of directory operations, such as repeated scans of large directorytrees, may suffer from poor performance. Applications that behave in this wayinclude:
rake
ember build
- Symfony
- Magento
- Zend Framework
- PHP applications that use Composer to installdependencies in a
vendor
folder
As a workaround for this behavior, you can put vendor or third-party librarydirectories in Docker volumes, perform temporary file system operationsoutside of bind mounts, and use third-party tools like Unison or
rsync
tosynchronize between container directories and bind-mounted directories. We areactively working on performance improvements using a number of differenttechniques. To learn more, see the topic on our roadmap.
Support
Docker Desktop offers support for developers subscribed to a Pro or a Team plan. Click here to upgrade your existing account.
This section contains instructions on how to get support, and covers the scope of Docker Desktop support.
How do I get Docker Desktop support?
If you have subscribed to a Pro and Team account, please raise a ticket through Docker Desktop support.
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Docker Community users can get support through our Github repos for-win and for-mac, where we respond on a best-effort basis.
What support can I get?
If you are a Pro or a Team user, you can request for support on the following types of issues:
- Desktop upgrade issues
- Desktop installation issues
- Installation crashes
- Failure to launch Docker Desktop on first run
- Usage issues
- Crash closing software
- Docker Desktop not behaving as expected
- Configuration issues
- Basic product ‘how to’ questions
What is not supported?
Docker Desktop excludes support for the following types of issues:
- Use on or in conjunction with hardware or software other than that specified in the applicable documentation
- Running on unsupported operating systems, including beta/preview versions of operating systems
- Running containers of a different architecture using emulation
- Support for the Docker engine, Docker CLI, or other bundled Linux components
- Support for Kubernetes
- Features labeled as experimental
- System/Server administration activities
- Supporting Desktop as a production runtime
- Scale deployment/multi-machine installation of Desktop
- Routine product maintenance (data backup, cleaning disk space and configuring log rotation)
- Third-party applications not provided by Docker
- Altered or modified Docker software
- Defects in the Docker software due to hardware malfunction, abuse, or improper use
- Any version of the Docker software other than the latest version
- Reimbursing and expenses spent for third-party services not provided by Docker
- Docker Support excludes training, customization, and integration
What versions are supported?
We currently only offer support for the latest version of Docker Desktop. If you are running an older version, you may be asked to upgrade before we investigate your support request.
How many machines can I get support for Docker Desktop on?
As a Pro user you can get support for Docker Desktop on a single machine.As a Team, you can get support for Docker Desktop for the number of machines equal to the number of seats as part of your plan.
What OS’s are supported?
Docker Desktop is available for Mac and Windows. The supported version information can be found on the following pages:
Can I run Docker Desktop on Virtualized hardware?
No, currently this is unsupported and against the terms of use.
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