direktori cari
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
watak

您正在查看传统独立群组的文档。这些主题描述了独立的 Docker Swarm。在 Docker 1.12 及更高版本中,Swarm 模式与 Docker Engine 集成。大多数用户应该使用集成的 Swarm 模式 - 一个好的开始就是 Swarm 模式入门, Swarm 模式 CLI 命令以及 Docker 演练入门。独立 Docker Swarm 未集成到 Docker Engine API 和 CLI 命令中。

Docker Compose 和 Docker Swarm 旨在实现完全集成,这意味着您可以将一个Compose应用程序指向一个 Swarm 集群,并且只需像使用单个 Docker 主机一样工作即可。

实际的集成范围取决于您使用的 Compose 文件格式的版本:

  • 如果您使用的是版本1 links,则您的应用程序可以正常工作,但Swarm会将所有容器安排在一台主机上,因为容器之间的链接不适用于使用旧网络系统的主机。

  • 如果您使用的是第2版,则您的应用程序应该无任何更改:

-  subject to the [limitations](index#limitations) described below,-  as long as the Swarm cluster is configured to use the [overlay driver](../../engine/userguide/networking/index#an-overlay-network-with-docker-engine-swarm-mode), or a custom driver which supports multi-host networking.

阅读多主机网络入门以了解如何使用 Docker Machine 和覆盖驱动程序设置 Swarm 群集。运行后,将应用程序部署到该应用程序应该如此简单:

$ eval "$(docker-machine env --swarm <name of swarm master machine>)"$ docker-compose up

局限性

构建图像

Swarm 可以像 Docker 实例一样通过 Dockerfile 构建镜像,但生成的镜像只能存在于单个节点上,不会分配给其他节点。

如果您想使用 Compose 将服务扩展到多个节点,则必须自己构建它,将其推送到注册表(例如 Docker Hub)并从docker-compose.yml以下位置引用它:

$ docker build -t myusername/web .$ docker push myusername/web

$ cat docker-compose.yml
web:
  image: myusername/web

$ docker-compose up -d
$ docker-compose scale web=3

多重依赖

如果一个服务具有强制联合调度类型的多个依赖关系(参见下面的自动调度),那么 Swarm 可能会调度依赖关系到不同的节点上,从而无法安排依赖服务。例如,这里foo需要被共同调度与barbaz

version: "2"services:
  foo:
    image: foo
    volumes_from: ["bar"]
    network_mode: "service:baz"
  bar:
    image: bar
  baz:
    image: baz

问题是,群可能会先安排barbaz不同的节点上(因为他们是不依赖于彼此),使它不可能挑选一个合适的节点foo

要解决此问题,请使用手动调度来确保所有三个服务都在同一个节点上结束:

version: "2"services:
  foo:
    image: foo
    volumes_from: ["bar"]
    network_mode: "service:baz"
    environment:      - "constraint:node==node-1"
  bar:
    image: bar
    environment:      - "constraint:node==node-1"
  baz:
    image: baz
    environment:      - "constraint:node==node-1"

主机端口和重新创建容器

如果服务从主机映射端口,例如80:8000,那么docker-compose up在第一次之后运行它时可能会出现类似下面的错误:

docker: Error response from daemon: unable to find a node that satisfies
container==6ab2dfe36615ae786ef3fc35d641a260e3ea9663d6e69c5b70ce0ca6cb373c02.

这种错误的常见原因是容器在没有显式映射的情况下具有一个卷(在其图像或撰写文件中定义),因此为了保留其数据,Compose 已指示 Swarm 安排新容器与旧容器相同的节点。这导致了端口冲突。

解决这个问题有两个可行的解决办法:

  • 指定一个已命名的卷,并使用一个卷驱动程序,该卷驱动程序能够将该卷挂载到容器中,而不管其预定在哪个节点上。如果服务仅使用命名卷,则Compose不会为Swarm提供任何特定的计划指示。版本:“2”服务:web:build:。端口: - “80:8000”卷: -  web-logs:/ var / log / web卷:web-logs:driver:custom-volume-driver

  • 在创建新容器之前删除旧容器。您将失去该卷中的任何数据。

  • $ docker-compose stop web

  • $ docker-compose rm -f web

  • $ docker-compose up web

调度容器

自动调度

某些配置选项将导致容器在同一个 Swarm 节点上自动进行调度,以确保它们正常工作。这些是:

  • network_mode: "service:..."network_mode: "container:..."(以及net: "container:..."第一版文件格式)。

  • volumes_from

  • links

手动调度

Swarm 提供了丰富的时间安排和亲和力提示,使您能够控制容器的位置。它们通过容器环境变量指定,因此您可以使用Compose 的environment选项来设置它们。

# Schedule containers on a specific node
environment:  - "constraint:node==node-1"# Schedule containers on a node that has the 'storage' label set to 'ssd'environment:  - "constraint:storage==ssd"# Schedule containers where the 'redis' image is already pulled
environment:  - "affinity:image==redis"

有关完整的可用过滤器和表达式,请参阅 Swarm 文档。

Artikel sebelumnya: Artikel seterusnya: