目錄 搜尋
Compose About versions and upgrading (Compose) ASP.NET Core + SQL Server on Linux (Compose) CLI environment variables (Compose) Command-line completion (Compose) Compose(组成) Compose command-line reference(组合命令行参考) Control startup order (Compose) Django and PostgreSQL (Compose) Docker stacks and distributed application bundles (Compose) docker-compose build(docker-compose构建) docker-compose bundle docker-compose config docker-compose create docker-compose down docker-compose events docker-compose exec docker-compose help docker-compose images docker-compose kill docker-compose logs docker-compose pause docker-compose port docker-compose ps docker-compose pull docker-compose push docker-compose restart docker-compose rm docker-compose run docker-compose scale docker-compose start docker-compose stop docker-compose top docker-compose unpause docker-compose up Environment file (Compose) Environment variables in Compose Extend services in Compose Frequently asked questions (Compose) Getting started (Compose) Install Compose Link environment variables (deprecated) (Compose) Networking in Compose Overview of Docker Compose Overview of docker-compose CLI Quickstart: Compose and WordPress Rails and PostgreSQL (Compose) Sample apps with Compose Using Compose in production Using Compose with Swarm Engine .NET Core application (Engine) About images, containers, and storage drivers (Engine) Add nodes to the swarm (Engine) Apply custom metadata (Engine) Apply rolling updates (Engine) apt-cacher-ng Best practices for writing Dockerfiles (Engine) Binaries (Engine) Bind container ports to the host (Engine) Breaking changes (Engine) Build your own bridge (Engine) Configure container DNS (Engine) Configure container DNS in user-defined networks (Engine) CouchDB (Engine) Create a base image (Engine) Create a swarm (Engine) Customize the docker0 bridge (Engine) Debian (Engine) Default bridge network Delete the service (Engine) Deploy a service (Engine) Deploy services to a swarm (Engine) Deprecated Engine features Docker container networking (Engine) Docker overview (Engine) Docker run reference (Engine) Dockerfile reference (Engine) Dockerize an application Drain a node (Engine) Engine FAQ (Engine) Fedora (Engine) Get started (Engine) Get started with macvlan network driver (Engine) Get started with multi-host networking (Engine) How nodes work (Engine) How services work (Engine) Image management (Engine) Inspect the service (Engine) Install Docker (Engine) IPv6 with Docker (Engine) Join nodes to a swarm (Engine) Legacy container links (Engine) Lock your swarm (Engine) Manage nodes in a swarm (Engine) Manage sensitive data with Docker secrets (Engine) Manage swarm security with PKI (Engine) Manage swarm service networks (Engine) Migrate to Engine 1.10 Optional Linux post-installation steps (Engine) Overview (Engine) PostgreSQL (Engine) Raft consensus in swarm mode (Engine) Riak (Engine) Run Docker Engine in swarm mode Scale the service (Engine) SDKs (Engine) Select a storage driver (Engine) Set up for the tutorial (Engine) SSHd (Engine) Storage driver overview (Engine) Store service configuration data (Engine) Swarm administration guide (Engine) Swarm mode key concepts (Engine) Swarm mode overlay network security model (Engine) Swarm mode overview (Engine) Understand container communication (Engine) Use multi-stage builds (Engine) Use swarm mode routing mesh (Engine) Use the AUFS storage driver (Engine) Use the Btrfs storage driver (Engine) Use the Device mapper storage driver (Engine) Use the OverlayFS storage driver (Engine) Use the VFS storage driver (Engine) Use the ZFS storage driver (Engine) Engine: Admin Guide Amazon CloudWatch logs logging driver (Engine) Bind mounts (Engine) Collect Docker metrics with Prometheus (Engine) Configuring and running Docker (Engine) Configuring logging drivers (Engine) Control and configure Docker with systemd (Engine) ETW logging driver (Engine) Fluentd logging driver (Engine) Format command and log output (Engine) Google Cloud logging driver (Engine) Graylog Extended Format (GELF) logging driver (Engine) Journald logging driver (Engine) JSON File logging driver (Engine) Keep containers alive during daemon downtime (Engine) Limit a container's resources (Engine) Link via an ambassador container (Engine) Log tags for logging driver (Engine) Logentries logging driver (Engine) PowerShell DSC usage (Engine) Prune unused Docker objects (Engine) Run multiple services in a container (Engine) Runtime metrics (Engine) Splunk logging driver (Engine) Start containers automatically (Engine) Storage overview (Engine) Syslog logging driver (Engine) tmpfs mounts Troubleshoot volume problems (Engine) Use a logging driver plugin (Engine) Using Ansible (Engine) Using Chef (Engine) Using Puppet (Engine) View a container's logs (Engine) Volumes (Engine) Engine: CLI Daemon CLI reference (dockerd) (Engine) docker docker attach docker build docker checkpoint docker checkpoint create docker checkpoint ls docker checkpoint rm docker commit docker config docker config create docker config inspect docker config ls docker config rm docker container docker container attach docker container commit docker container cp docker container create docker container diff docker container exec docker container export docker container inspect docker container kill docker container logs docker container ls docker container pause docker container port docker container prune docker container rename docker container restart docker container rm docker container run docker container start docker container stats docker container stop docker container top docker container unpause docker container update docker container wait docker cp docker create docker deploy docker diff docker events docker exec docker export docker history docker image docker image build docker image history docker image import docker image inspect docker image load docker image ls docker image prune docker image pull docker image push docker image rm docker image save docker image tag docker images docker import docker info docker inspect docker kill docker load docker login docker logout docker logs docker network docker network connect docker network create docker network disconnect docker network inspect docker network ls docker network prune docker network rm docker node docker node demote docker node inspect docker node ls docker node promote docker node ps docker node rm docker node update docker pause docker plugin docker plugin create docker plugin disable docker plugin enable docker plugin inspect docker plugin install docker plugin ls docker plugin push docker plugin rm docker plugin set docker plugin upgrade docker port docker ps docker pull docker push docker rename docker restart docker rm docker rmi docker run docker save docker search docker secret docker secret create docker secret inspect docker secret ls docker secret rm docker service docker service create docker service inspect docker service logs docker service ls docker service ps docker service rm docker service scale docker service update docker stack docker stack deploy docker stack ls docker stack ps docker stack rm docker stack services docker start docker stats docker stop docker swarm docker swarm ca docker swarm init docker swarm join docker swarm join-token docker swarm leave docker swarm unlock docker swarm unlock-key docker swarm update docker system docker system df docker system events docker system info docker system prune docker tag docker top docker unpause docker update docker version docker volume docker volume create docker volume inspect docker volume ls docker volume prune docker volume rm docker wait Use the Docker command line (Engine) Engine: Extend Access authorization plugin (Engine) Docker log driver plugins Docker network driver plugins (Engine) Extending Engine with plugins Managed plugin system (Engine) Plugin configuration (Engine) Plugins API (Engine) Volume plugins (Engine) Engine: Security AppArmor security profiles for Docker (Engine) Automation with content trust (Engine) Content trust in Docker (Engine) Delegations for content trust (Engine) Deploying Notary (Engine) Docker security (Engine) Docker security non-events (Engine) Isolate containers with a user namespace (Engine) Manage keys for content trust (Engine) Play in a content trust sandbox (Engine) Protect the Docker daemon socket (Engine) Seccomp security profiles for Docker (Engine) Secure Engine Use trusted images Using certificates for repository client verification (Engine) Engine: Tutorials Engine tutorials Network containers (Engine) Get Started Part 1: Orientation Part 2: Containers Part 3: Services Part 4: Swarms Part 5: Stacks Part 6: Deploy your app Machine Amazon Web Services (Machine) Digital Ocean (Machine) docker-machine active docker-machine config docker-machine create docker-machine env docker-machine help docker-machine inspect docker-machine ip docker-machine kill docker-machine ls docker-machine provision docker-machine regenerate-certs docker-machine restart docker-machine rm docker-machine scp docker-machine ssh docker-machine start docker-machine status docker-machine stop docker-machine upgrade docker-machine url Driver options and operating system defaults (Machine) Drivers overview (Machine) Exoscale (Machine) Generic (Machine) Get started with a local VM (Machine) Google Compute Engine (Machine) IBM Softlayer (Machine) Install Machine Machine Machine CLI overview Machine command-line completion Machine concepts and help Machine overview Microsoft Azure (Machine) Microsoft Hyper-V (Machine) Migrate from Boot2Docker to Machine OpenStack (Machine) Oracle VirtualBox (Machine) Provision AWS EC2 instances (Machine) Provision Digital Ocean Droplets (Machine) Provision hosts in the cloud (Machine) Rackspace (Machine) VMware Fusion (Machine) VMware vCloud Air (Machine) VMware vSphere (Machine) Notary Client configuration (Notary) Common Server and signer configurations (Notary) Getting started with Notary Notary changelog Notary configuration files Running a Notary service Server configuration (Notary) Signer configuration (Notary) Understand the service architecture (Notary) Use the Notary client
文字

Docker Engine 1.12 引入了群模式,使您能够创建一个或多个名为群集的码头引擎集群。群集由一个或多个节点组成:以群集模式运行 DockerEngine 1.12 或更高版本的物理或虚拟机。

有两种类型的节点:经理工人

如果您尚未阅读群体模式概述和关键概念。

管理器节点

Manager节点处理集群管理任务:

  • 维护集群状态

  • 调度服务

  • 提供群集模式 HTTP API 端点

使用 Raft 实施,管理人员可以保持整个群体及其上运行的所有服务的一致内部状态。出于测试目的,可以使用单个管理器运行群集。如果单管理器群中的管理器出现故障,您的服务将继续运行,但您需要创建一个新群集以进行恢复。

为了利用群模式的容错功能,Docker 建议您根据贵组织的高可用性要求实施奇数个节点。当你有多个管理器时,你可以在没有停机时间的情况下从管理器节点的故障中恢复。

  • 三管理者群体容忍一名管理人员的最大损失。

  • 五管理者群体最多可同时丢失两个管理节点。

  • 一个N经理集群将容忍最多损失(N-1)/2经理。

  • Docker 推荐一个群体最多有七个管理节点。

重要提示:添加更多管理者并不意味着可扩展性或更高的性能。一般来说,情况正好相反。

工人节点

工作者节点也是 Docker Engine 的实例,其唯一目的是执行容器。工作者节点不参与 Raft 分布式状态,进行调度决策或服务于群集模式 HTTP API。

您可以创建一个管理节点群,但不能有一个没有至少一个管理节点的工作节点。默认情况下,所有经理都是工人。在单个管理器节点集群中,您可以像运行命令那样运行命令docker service create,而且计划程序将把所有任务放在本地引擎上。

要阻止调度程序将任务放置到多节点群中的管理器节点上,请将管理器节点的可用性设置为Drain。调度程序正常地停止Drain模式中节点上的任务,并调度Active节点上的任务。调度程序不会将新任务分配给具有Drain可用性的节点。

请参阅docker node update命令行参考以了解如何更改节点可用性。

改变角色

您可以通过运行将工作节点提升为管理员docker node promote。例如,当您将管理器节点离线进行维护时,您可能需要升级工作节点。请参阅节点宣传。

您也可以将管理器节点降级为工作节点。请参阅节点降级。

学到更多

  • 了解群集模式服务如何工作。

  • 了解 PKI 如何在群集模式下工作。

上一篇: 下一篇: