Starting from the "docker 1.12.0" version, swarm is built-in; swarm is a platform used to manage docker clusters. It is developed using the go language. Starting from the "1.12.0" version, "Docker Swarm" has included In the Docker engine, the service discovery tool is already built-in, so there is no need to configure Etcd or Consul for service discovery configuration.
The operating environment of this tutorial: linux7.3 system, docker version 19.03, Dell G3 computer.
Which version of docker has built-in swarm
Swarm is a platform launched by Docker to manage docker clusters. Almost all development is done in GO language
Docker Swarm and Docker Compose is the same as Docker's official container orchestration project, but the difference is that Docker Compose is a tool to create multiple containers on a single server or host, while Docker Swarm can create container cluster services on multiple servers or hosts. , for the deployment of microservices, obviously Docker Swarm will be more suitable.
Starting from Docker 1.12.0 version, Docker Swarm has been included in the Docker engine (docker swarm), and has built-in service discovery tools. We do not need to configure Etcd or Etcd as before. Consul is used for service discovery configuration.
As can be seen from the above figure, Swarm is a typical master-slave structure, which elects managers by discovering services. The manager is the central management node. Agents run on each node to accept the unified management of the manager. The cluster will automatically elect manager nodes in a distributed manner through the Raft protocol without the need for additional discovery service support, avoiding single-point bottlenecks. It also has built-in DNS. load balancing and integrated support for external load balancing mechanisms.
Extended knowledge
Docker Swarm working principle
1) Docker Engine client
docker service create: We use docker service create This command creates a service.
2) swarm manager
API: This request is received directly by the API of Swarm manager, receives the command and creates the service object.
orchestrator: Create a task for the service.
allocater: Assign an IP address to this task.
dispatcher: allocate tasks to specified nodes.
scheduler: Issue the specified command to the node.
3) Worker node: After receiving the manager task, run the task
container: Create the corresponding container.
worker: Connect to the scheduler to check the assigned tasks
executor: execute the tasks assigned to the worker node
Service: is a copy, which can be understood as a task , a task is a container.
swarm manager: It distributes this copy to three available work nodes.
container: The actual docker container to run the application.
task: The name of the work task is the service name followed by .1 and so on according to the number.
Recommended learning: "docker video tutorial"
The above is the detailed content of Which version of docker has built-in swarm?. For more information, please follow other related articles on the PHP Chinese website!

docker中rm和rmi的区别:rm命令用于删除一个或者多个容器,而rmi命令用于删除一个或者多个镜像;rm命令的语法为“docker rm [OPTIONS] CONTAINER [CONTAINER...]”,rmi命令的语法为“docker rmi [OPTIONS] IMAGE [IMAGE...]”。

docker官方镜像有:1、nginx,一个高性能的HTTP和反向代理服务;2、alpine,一个面向安全应用的轻量级Linux发行版;3、busybox,一个集成了三百多个常用Linux命令和工具的软件;4、ubuntu;5、PHP等等。

docker容器重启后数据会丢失的;但是可以利用volume或者“data container”来实现数据持久化,在容器关闭之后可以利用“-v”或者“–volumes-from”重新使用以前的数据,docker也可挂载宿主机磁盘目录,用来永久存储数据。

docker对于小型企业、个人、教育和非商业开源项目来说是免费的;2021年8月31日,docker宣布“Docker Desktop”将转变“Docker Personal”,将只免费提供给小型企业、个人、教育和非商业开源项目使用,对于其他用例则需要付费订阅。

docker能安装oracle。安装方法:1、拉取Oracle官方镜像,可以利用“docker images”查看镜像;2、启动容器后利用“docker exec -it oracle11g bash”进入容器,并且编辑环境变量;3、利用“sqlplus /nolog”进入oracle命令行即可。

解决方法:1、停止docker服务后,利用“rsync -avz /var/lib/docker 大磁盘目录/docker/lib/”将docker迁移到大容量磁盘中;2、编辑“/etc/docker/daemon.json”添加指定参数,将docker的目录迁移绑定;3、重载和重启docker服务即可。

有类似docker的软件:1、Podman,是一个无守护程序的开源Linux原生容器引擎;2、LXD,是一个专为LXC Linux容器设计的开源容器引擎;3、Buildah,是是红帽为容器化系统开发的一个OCI镜像构建工具;4、RunC等。

容器管理ui工具有:1、Portainer,是一个轻量级的基于Web的Docker管理GUI;2、Kitematic,是一个GUI工具,可以更快速、更简单的运行容器;3、LazyDocker,基于终端的一个可视化查询工具;4、DockStation,一款桌面应用程序;5、Docker Desktop,能为Docker设置资源限制,比如内存,CPU,磁盘镜像大小;6、Docui。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SublimeText3 Linux new version
SublimeText3 Linux latest version

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

SublimeText3 Chinese version
Chinese version, very easy to use

Notepad++7.3.1
Easy-to-use and free code editor

Dreamweaver Mac version
Visual web development tools
