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How to persist data in Docker?
TopersistdatainDocker,useDockervolumesorbindmounts;prefernamedvolumesforproduction.1.UseDockervolumes:createwithdockervolumecreatemydataandattachvia-vmydata:/app/dataor--mountsource=mydata,target=/app/data;benefitsincludeDocker-managedstorage,portabi
Aug 04, 2025 am 08:53 AM
What is the Docker daemon?
TheDockerdaemon(dockerd)isthecorebackgroundservicethatmanagesDockerobjectsandrunscontainers.1)ItreceivescommandsfromtheDockerclientviatheDockerAPIandexecutesoperationslikecreating,starting,stopping,andremovingcontainers.2)Ithandlesimagemanagementbypu
Aug 04, 2025 am 01:50 AM
How do you diagnose and resolve high CPU or memory usage in Docker containers?
ToaddresshighCPUormemoryusageinDockercontainers,startbycheckingresourceusagewithdockerstatstoidentifyproblematiccontainers.Next,setresourcelimitsusing-mformemoryand--cpusforCPUtopreventoveruse.Theninvestigateinsidethecontainerusingtoolsliketop,htop,o
Aug 04, 2025 am 12:58 AM
Docker 'got permission denied while trying to connect to the Docker daemon socket'
Add the current user to the docker group: sudousermod-aGdocker$USER; 2. Log out and log in again to refresh the group permissions; 3. Verify whether it is resolved: Running dockerps will succeed if it is not reported; 4. If it still fails, check the Docker service status: sudosystemctlstatusdocker, start it if it is not running; 5. Ensure that the permissions of /var/run/docker.sock are correct, the owner is root, the group is docker, and the permissions are srw-rw---. After completing these steps, the user can access the Docker daemon normally.
Aug 04, 2025 am 12:19 AM
What does docker system prune do?
dockersystemrune cleans up unused Docker objects to free up disk space. 1. Delete the stopped container; 2. Delete the hanging mirror without labels; 3. Remove the network that is not used by the container; 4. Clear the build cache (Docker18.09). Running containers, named volumes, and tagged images are not deleted by default. You can use dockersystemrune-a to delete all unused images, or add --volumes to clean up volumes, but use these options in production environments with caution to avoid data loss or service interruption.
Aug 03, 2025 pm 04:26 PM
How do you use Docker with AWS (Amazon Web Services)?
TouseDockerwithAWSeffectively,startbysettingupyourDockerenvironmentonAWSusingEC2ormanagedserviceslikeECSorEKS;next,choosecontainerorchestrationoptionssuchasECSforscaleandintegrationorEKSforKubernetessupport;then,storeandmanageDockerimagesusingAmazonE
Aug 03, 2025 pm 04:24 PM
How do you troubleshoot network connectivity issues between Docker containers?
Docker containers fail to communicate usually due to network configuration, links, or service exposure settings. 1. Check whether the container is on the same custom network: Use dockernetworkls and dockerinspect to confirm. If it is not on the same network, you can connect through dockernetworkconnect or define a unified network in docker-compose.yml. 2. Verify whether communication is performed by the service name: Make sure to use the correct container name as the host name and test DNS resolution through ping, nslookup or dig. 3. Confirm the correct interface for the service listening: If Redis is bound to 127.0.0.1, it must be changed to 0.0.0.0 and pass n
Aug 03, 2025 am 04:47 AM
How to update Docker?
CheckyourcurrentDockerversionusingdocker--versiontodetermineifanupdateisneeded.2.OnLinux(Ubuntu/Debian),updateviasudoaptupdatefollowedbysudoaptupgradedocker-cedocker-ce-clicontainerd.io,orreinstallusingsudoaptinstalldocker-cedocker-ce-clicontainerd.i
Aug 03, 2025 am 02:45 AM
How to remove dangling Docker images?
DanglingimagesareuntaggedlayersnotassociatedwithanycontainerandcanberemovedusingDocker’sbuilt-incommands.1.Usedockerimageprunetosafelyremovedanglingimagesafterconfirmation,oradd-ftoforceremovalwithoutprompt.2.Usedockerimageprune-atoalsoremoveallunuse
Aug 02, 2025 am 11:37 AM
How can you encrypt Docker volumes?
YoucanencryptDockervolumesbyusingLUKSonLinux.First,installcryptsetupandcreateaLUKS-encrypteddevicewithsudocryptsetupluksFormat/dev/sdX1.Thenopenitwithsudocryptsetupopen/dev/sdX1my_encrypted_volumeandformatitwithsudomkfs.ext4/dev/mapper/my_encrypted_v
Aug 02, 2025 am 07:46 AM
What is a Docker image?
ADockerimageisalightweight,standalonepackagecontainingeverythingneededtorunsoftware,includingcode,runtime,libraries,andconfiguration.Itservesasanimmutableblueprintforcreatingcontainers,ensuringconsistentexecutionacrossenvironments.Imagesarebuiltfroma
Aug 02, 2025 am 07:31 AM
How to install Docker on Windows 10?
DockercanbeinstalledonWindows10bymeetingsystemrequirementsandfollowingthreemainsteps:1)EnableWSL2andvirtualizationbyrunningwsl--installinPowerShellasAdministrator,enablingHyper-VandWSLfeaturesifneeded,enteringBIOS/UEFItoenablevirtualization,andsettin
Aug 02, 2025 am 06:00 AM
How to get inside a Docker container?
Usedockerexec-it/bin/bashor/bin/shtoenterarunningcontainer,ensuringitisrunningfirstviadockerps;2.Ifthecontainerisstopped,startitwithdockerstartorrunanewtemporarycontainerforinspectionusingdockerrun-it--rm;3.Commonshellsinclude/bin/bashforUbuntu/Debia
Aug 01, 2025 am 04:49 AM
How to build a Docker image without a cache?
TobuildaDockerimagewithoutusingthecache,passthe--no-cacheflagtothedockerbuildcommand;thisensuresalllayersarerebuiltfromscratch,avoidingoutdateddependenciesorstalelayers,whichisusefulfordebugging,ensuringfreshpackageinstallations,achievingreproducible
Aug 01, 2025 am 04:34 AM
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