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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
Configuring Nginx Timeouts
Set proxy_connect_timeout to 5-10 seconds to ensure fast failure; 2. Set proxy_send_timeout to 10-30 seconds to adapt to slow uploads; 3. proxy_read_timeout matches the maximum response time of the application to avoid 504 errors; 4. If load is balanced, set proxy_next_upstream_timeout to limit the retry time - correctly configuring these values can significantly reduce gateway timeout, improve user experience, and continuously tuned in combination with actual logs and monitoring.
Aug 03, 2025 pm 04:25 PM
How do you use Docker with AWS (Amazon Web Services)?
TouseDockerwithAWSeffectively,startbysettingupyourDockerenvironmentonAWSusingEC2ormanagedserviceslikeECSorEKS;next,choosecontainerorchestrationoptionssuchasECSforscaleandintegrationorEKSforKubernetessupport;then,storeandmanageDockerimagesusingAmazonE
Aug 03, 2025 pm 04:24 PM
Migrate CentOS to AlmaLinux
Back up the system and ensure that CentOS7 or 8 is run, update the system and confirm the architecture support; 2. Download the official almalinux-deploy.sh script and execute it to automatically replace the warehouse and core package; 3. Verify the distribution information, kernel and warehouse configuration after restarting the system; 4. Check the third-party source, reinstall EPEL, and confirm that the service is normal; 5. It is recommended to use a brand new installation in the production environment to reduce risks, and finally it can be smoothly migrated to long-term supported AlmaLinux.
Aug 03, 2025 pm 04:09 PM
How to install Apache (httpd) on CentOS?
The steps to install Apache (httpd) on CentOS are as follows: 1. Make sure that the system is CentOS and has root or sudo permissions, and can be connected to the network; 2. Check whether httpd is installed. If it is not installed, update the package list and use sudoyumininstallhttpd to install; 3. After the installation is completed, start the service and set the power-on start. The commands are sudosystemctlstarthttpd and sudosystemctlenablehttpd respectively; 4. If the default page cannot be accessed, the firewall port 80 must be opened, and the command is sudofirewall-cmd--permanent--add-port
Aug 03, 2025 pm 12:41 PM
How to install Python 3 on CentOS 7
It is recommended to use SCL to install Python 3.6, and install it through sudoyumininstallcentos-release-scl and sudoyumininstallrh-python36, and then enable it with sclenablerh-python36bash. It can safely run Python 3 in parallel without affecting the system's dependency Python 2.7; 2. If the system supports it, you can directly use sudoyumininstallpython3 to install Python 3 to generate independent Python 3 commands; 3. When higher versions such as Python 3.9 and above are required, you can compile and install it through source code. You must first install the dependency and download the source code to execute it.
Aug 03, 2025 am 11:05 AM
How to run windows applications on mac os
UseBootCampforbestperformanceonIntelMacsbyinstallingWindowsalongsidemacOSwithfullhardwareaccessbutrequiringareboottoswitch.2.UsevirtualizationsoftwarelikeParallels,VMwareFusion,orUTMtorunWindowsinsidemacOSwithoutrebooting,idealforrunningappsside-by-s
Aug 03, 2025 am 10:47 AM
How to use a Windows keyboard on a Mac (key mapping)?
UsingaWindowskeyboardonaMacispossiblewithsomeadjustments.First,understandkeydifferences:WindowskeyactsasCommand(?),AltasOption(?),andfunctionkeysmaybehavedifferently.Second,swaptheWindowsandAltkeysviaSystemSettings>Keyboard>ModifierKeystomatchy
Aug 03, 2025 am 10:15 AM
How to zip a file on mac os
To compress a file, right-click the file or folder and select "Compress"; use the terminal to enter zip-rarchive_name.zipfile_or_folder_name; note that the .zip format is highly compatible, but macOS does not support native creation of compressed packages with passwords.
Aug 03, 2025 am 10:01 AM
How to use Sidecar with mac os and iPad
TouseSidecar,ensureyourMacandiPadmeetcompatibilityrequirements:supportedMacmodelsfrom2016orlaterrunningmacOSCatalina10.15.4orlater,andcompatibleiPadsfrom2018orlaterrunningiPadOS13.4orlater,bothsignedinwiththesameAppleID,withBluetooth,Wi-Fi,andHandoff
Aug 03, 2025 am 08:31 AM
How to format a new disk in CentOS
Identifythenewdiskusinglsblkorfdisk-ltolocatethecorrectdevicelike/dev/sdb.2.Optionallypartitionthediskwithfdisk/dev/sdb,createaprimarypartitionusingdefaultsettings,andwritechangeswithw,thenrunpartprobetoupdatethekernel.3.Createafilesystemusingmkfs-tx
Aug 03, 2025 am 08:19 AM
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