Docker-跨主机通信（推荐）
推荐使用 docker swarm 实现跨主机通讯
安装swarm集群
创建swarm集群
bash
# 初始化管理节点
docker swarm init --advertise-addr=<IP-ADDRESS-OF-MANAGER>
# 添加节点
docker swarm join --token <TOKEN> \
--advertise-addr <IP-ADDRESS-OF-WORKER-1> \
<IP-ADDRESS-OF-MANAGER>:2377
# 查看节点
docker node ls
# 查看网络
docker network ls
# 离开集群
# docker swarm leave
# 删除集群
# docker swarm leave -fbash
# 初始化管理节点
root@docker01:~# docker swarm init --advertise-addr=172.17.0.5
Swarm initialized: current node (yzb76l5u402828v3uhpusfv8f) is now a manager.
To add a worker to this swarm, run the following command:
docker swarm join --token SWMTKN-1-***********-cvq57sikpeejb3tpqnrdbf1rq 172.17.0.5:2377
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
root@docker01:~#
# 添加普通节点
root@docker02:~# docker swarm join --token SWMTKN-1-***********-cvq57sikpeejb3tpqnrdbf1rq 172.17.0.5:2377
This node joined a swarm as a worker.
# 查看节点
root@docker01:~# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION
yzb76l5u402828v3uhpusfv8f * docker01 Ready Active Leader 20.10.17
whd1n03zwlyei0um2h4ywur0m docker02 Ready Active 20.10.17
961ra48kv302itlr8v5ihmqnf docker03 Ready Active 20.10.17
root@docker01:~#
# ##########################################################################################
# 增加管理节点
root@docker01:~# docker swarm join-token manager
To add a manager to this swarm, run the following command:
docker swarm join --token SWMTKN-1-***********-dpks47on2ueexia3hl0ce3lfy 172.17.0.5:2377
# 查看节点
root@docker01:~# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION
yzb76l5u402828v3uhpusfv8f * docker01 Ready Active Leader 20.10.17
2m4plmtiigaquqrwu7rwfa02v docker02 Ready Active Reachable 20.10.17
961ra48kv302itlr8v5ihmqnf docker03 Ready Active 20.10.17
root@docker01:~#
# ##########################################################################################
# 查看网络
root@docker03:~# docker network ls
NETWORK ID NAME DRIVER SCOPE
230aef713b00 bridge bridge local
3e574696ff60 docker_gwbridge bridge local
10bcc6c5dd60 host host local
vlay27b818mj ingress overlay swarm
5745ca34a364 none null local
root@docker03:~#常见问题
添加节点失败：考虑系统是否打开了防火墙。如果开启，需要允许2377端口
bash
firewall-cmd --zone=public --add-port=2377/tcp --permanent
firewall-cmd --reload
打通容器网络
bash
# 创建网络
docker network create -d overlay --attachable open-net
# 创建副本
docker service create --name busybox-net --network open-net --replicas 2 busybox:latest top
# 扩展副本到(每增加几个节点，就需要扩展几个副本)
docker service scale busybox-net=3
# 完成后，切换到work节点，检查网络是否正常打通
docker network ls创建堆栈
bash
# 创建可以被其他容器连接的网络
docker network create -d overlay open-net --attachable
# 查看网络
docker network ls
# 删除网络
docker network rm open-net
# 创建服务(启动三个副本)
#docker service create \
# --name my-nginx \
# --network open-net \
# --replicas 3 \
# --publish published=8080,target=80 \
# nginx:latest
# 查看容器
#docker ps
# 删除服务
docker service rm my-nginx使用 my-nginx-stack.yaml 创建堆栈
yaml
version: '3.9'
services:
my-nginx:
image: nginx:latest
ports:
- "8080:80"
deploy:
mode: replicated
replicas: 2
endpoint_mode: vip
restart: on-failure
networks:
default:
driver: overlay
name: 'open-net'
attachable: true # 可以被其他容器访问
# 配置网络（可以忽略）
ipam:
driver: default
config:
- subnet: "192.168.1.0/24"
# 验证服务是否可以被访问到
# docker run -it --rm --network=open-net nicolaka/netshoot
# dig my-nginx连接到已经外部网络
yaml
version: '3.9'
# 引用网络
networks:
default:
external: true
name: open-net部署堆栈
bash
# 部署堆栈
docker stack deploy -c my-nginx-stack.yaml demo
# 查看堆栈列表
docker stack ls
root@docker01:~# docker stack ls
NAME SERVICES ORCHESTRATOR
demo 1 Swarm
# 查看堆栈的任务列表
docker stack ps demo
root@docker01:~# docker stack ps demo
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
gj5qq1f5h18l demo_my-nginx.1 nginx:latest docker02 Running Running 7 minutes ago
zfmvia6p764h demo_my-nginx.2 nginx:latest docker01 Running Running 7 minutes ago
vszj173nrdtn demo_my-nginx.3 nginx:latest docker03 Running Running 7 minutes ago
root@docker01:~#
# 查看堆栈中的服务信息
docker stack services demo
root@docker01:~# docker stack services demo
ID NAME MODE REPLICAS IMAGE PORTS
w89yp8530ocp demo_my-nginx replicated 3/3 nginx:latest *:8080->80/tcp
root@docker01:~#
# 删除堆栈
docker stack rm demo操作服务
bash
# 查看服务
docker service ls
# 查看服务任务
docker service ps <NAME>
# 服务伸缩扩容
docker service scale demo_my-nginx=3
# 查看服务任务
root@docker01:~# docker service ps demo_my-nginx
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
gj5qq1f5h18l demo_my-nginx.1 nginx:latest docker02 Running Running 15 seconds ago
zfmvia6p764h demo_my-nginx.2 nginx:latest docker01 Running Running 15 seconds ago
vszj173nrdtn demo_my-nginx.3 nginx:latest docker03 Running Running 15 seconds ago
root@docker01:~#