1 Swarm介绍
安装docker
https://blog.csdn.net/zx77588023/article/details/122652560
1.1 Warm文档
https://docs.docker.com/config/daemon/prometheus/
Run your app in production -> Configure containers -> Scale your app
1.2 工作模式
Raft：一致性算法
1.3 购买服务器
集群
2主2从
2 搭建集群
[root@VM-0-14-centos ~]# docker swarm --help
Usage: docker swarm COMMAND
Manage Swarm
Commands:
ca Display and rotate the root CA
init Initialize a swarm
join Join a swarm as a node and/or manager
join-token Manage join tokens
leave Leave the swarm
unlock Unlock swarm
unlock-key Manage the unlock key
update Update the swarm
Run 'docker swarm COMMAND --help' for more information on a command.
[root@VM-0-14-centos ~]# docker swarm init --help
Usage: docker swarm init [OPTIONS]
Initialize a swarm
Options:
--advertise-addr string # 广播地址 Advertised address (format: <ip|interface>[:port])
--autolock Enable manager autolocking (requiring an unlock key to start a
stopped manager)
--availability string Availability of the node ("active"|"pause"|"drain") (default "active")
--cert-expiry duration Validity period for node certificates (ns|us|ms|s|m|h) (default
2160h0m0s)
--data-path-addr string Address or interface to use for data path traffic (format:
<ip|interface>)
--data-path-port uint32 Port number to use for data path traffic (1024 - 49151). If no
value is set or is set to 0, the default port (4789) is used.
--default-addr-pool ipNetSlice default address pool in CIDR format (default [])
--default-addr-pool-mask-length uint32 default address pool subnet mask length (default 24)
--dispatcher-heartbeat duration Dispatcher heartbeat period (ns|us|ms|s|m|h) (default 5s)
--external-ca external-ca Specifications of one or more certificate signing endpoints
--force-new-cluster Force create a new cluster from current state
--listen-addr node-addr Listen address (format: <ip|interface>[:port]) (default 0.0.0.0:2377)
--max-snapshots uint Number of additional Raft snapshots to retain
--snapshot-interval uint # 快照 Number of log entries between Raft snapshots (default 10000)
--task-history-limit int Task history retention limit (default 5)# 初始化主节点
docker swarm init
# 加入一个节点（管理者、worker）
docker swarm join
# 获取令牌
docker swarm join-token manager # 生成加入 manager节点 命令
docker swarm join-token worker # 生成加入 worker 节点 命令将dokcer1设置为主节点
docker swarm init --advertise-addr 172.27.0.6
docker2加入1节点
docker swarm join --token SWMTKN-1-6b1kbshfye331k4d86az2ohqvdwlj1bijsbka6hvb8h5ha4n28-e61bl5kpo7c1jbaj4hj8nizv1 172.27.0.6:2377主节点查看所有节点
docker node ls3 Raft协议
双主双从：假设一个节点挂了！其他节点是否可以用: 不可用
Raft协议：保证大多数接待存货才可以用、只要>1，集群至少大于3台
关闭docker：测试挂机
systemctl stop docker退出集群
docker swarm leave故：至少3个主节点 多于1台机器存货
4 弹性、扩缩容、集群
docker-compose up：启动一个项目。单机
集群：swarm docker service
容器 => 服务 => 副本
帮助
[root@VM-0-6-centos ~]# docker service --help
Usage: docker service COMMAND
Manage services
Commands:
create 创建一个 new service
inspect 查看services细节
logs 查看service日志
ls List services
ps List the tasks of one or more services
rm Remove one or more services
rollback Revert changes to a service's configuration
scale 动态扩缩容 Scale one or multiple replicated services
update 更行service
Run 'docker service COMMAND --help' for more information on a command.
启动服务
docker service create -p 8888:80 --name my-nginx nginxdocker run 容器启动！不具有扩缩容
docker service 服务！具有扩缩容，滚动更新查看服务
# REPLICAS：副本数目
docker service ps ls
docker service ps my-nginx
# 查看服务 元数据
docker service inspect my0nginx更新副本数量
docker service update --replicas 5 my-nginx
或
docker service scale my-nginx=5调整service 以什么方式运行
dcoker service create --mode replicated --name mytom tomcat:7
docker service create --mode global --name haha alpine ping baidu.comDocker Stack
# 单机
docker-compose up -d wordpress.yaml
# 集群
docker-stack deploy wordpress.yaml
