How to configure a container orchestration platform (such as Docker Swarm) on Linux

How to configure a container orchestration platform (such as Docker Swarm) on Linux

Introduction:
With the widespread application of cloud computing and containerization technology, container orchestration platforms have become important for managing containerized applications. tool. Among them, Docker Swarm, as a popular container orchestration platform, provides simple and easy-to-use container orchestration and management functions. This article will introduce how to configure Docker Swarm on Linux and provide corresponding code examples.

1. Install Docker
Before starting to configure Docker Swarm, you first need to install Docker on Linux. The following is a sample code to install Docker on Ubuntu:

# 更新apt软件包索引
sudo apt-get update

# 安装Docker依赖库
sudo apt-get install apt-transport-https ca-certificates curl software-properties-common

# 添加Docker官方GPG密钥
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

# 添加Docker官方APT仓库
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

# 更新apt软件包索引
sudo apt-get update

# 安装Docker
sudo apt-get install docker-ce

# 启动Docker并设置开机自启
sudo systemctl start docker
sudo systemctl enable docker

The above code will install and start Docker on Ubuntu.

2. Configure Swarm management node
To configure a Docker Swarm cluster, you first need to select and configure a Swarm management node. The following is sample code to select and configure a Swarm management node:

# 创建一个Swarm管理节点
docker swarm init

# 获取Swarm集群的加入令牌
docker swarm join-token -q worker

The above code will create a Swarm management node and generate a token for joining other nodes.

3. Add other nodes
Before configuring the Swarm cluster, you need to add other nodes to the cluster. The following is a sample code for adding other nodes to the Swarm cluster:

# 在要加入的节点上执行以下命令
docker swarm join --token <SWMTKN> <MANAGER_IP>:<PORT>

Among them, 5bd2efb3de00cf98be19bdcf6664f692 is the Swarm cluster joining token generated in step 2, 19b05f14d4b7b21f73e8c5a2362c0fe9:a3b0c87895079be75e30be94102cc20b is the Swarm management The IP address and port of the node.

4. Configure the network
Docker Swarm provides a variety of network drivers to enable communication between containers. The following is a sample code to configure the Swarm network:

# 创建一个overlay网络
docker network create -d overlay my_network

The above code will create an overlay network named my_network.

5. Deploy services
After configuring the Swarm cluster and network, you can start deploying services. The following is a sample code for deploying a service:

# 在Swarm管理节点上创建一个服务
docker service create --replicas 3 --name my_service --network my_network nginx:latest

The above code will create a service named my_service in the Swarm cluster and create 3 copies using the nginx:latest mirror.

6. Check the service status
You can use the following sample code to check the status of the service:

# 查看服务状态
docker service ps my_service

The above code will display the status of the my_service service, including the number of copies, running status and other information.

7. Expansion Service
To expand the number of copies of the service, you can use the following sample code:

# 扩展服务副本数量
docker service scale my_service=5

The above code will expand the number of copies of the my_service service to 5.

8. Delete services and clusters
If you need to delete services and Swarm clusters, you can use the following sample code:

# 删除服务
docker service rm my_service

# 删除Swarm集群
docker swarm leave --force

The above code will delete the my_service service and Swarm cluster.

Conclusion:
This article introduces how to configure the container orchestration platform Docker Swarm on Linux and provides corresponding code examples. Through these sample codes, readers can learn how to install Docker, configure Swarm management nodes, join other nodes, configure networks, deploy services and other operations. I hope this article will be helpful to readers in configuring the container orchestration platform.

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