Docker Swarm Nginx负载均衡示例

准备三台Docker主机
这里是基于Ubuntu18.04
Server A:192.168.3.20
Server B:192.168.3.252
Server C:192.168.3.246

sudo apt install docker.io

vim /etc/apt/sources.list

# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse

# 预发布软件源，不建议启用
# deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse

vim /etc/docker/daemon.json

{
  "registry-mirrors" : [
    "https://mirror.ccs.tencentyun.com",
    "http://registry.docker-cn.com",
    "http://docker.mirrors.ustc.edu.cn",
    "http://hub-mirror.c.163.com"
  ],
  "insecure-registries" : [
    "registry.docker-cn.com",
    "docker.mirrors.ustc.edu.cn"
  ],

  "log-driver":"json-file",
  "log-opts": {"max-size":"500m", "max-file":"3"}
}

在Server A上

baloneo@baloneo:~$ sudo docker swarm init
Swarm initialized: current node (7kk0huvknn6891vfc231lls97) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-243ondqi7ujhu8jes5ygasds2ej5rdv767o4p2diexe64tbhzl-1sj0qydzanf2vvytlcf9p3gnq 192.168.3.20:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

在Server B上：

sudo docker swarm join --token SWMTKN-1-243ondqi7ujhu8jes5ygasds2ej5rdv767o4p2diexe64tbhzl-1sj0qydzanf2vvytlcf9p3gnq 192.168.3.20:2377

在Server C上

➜  docker swarm join --token SWMTKN-1-243ondqi7ujhu8jes5ygasds2ej5rdv767o4p2diexe64tbhzl-1sj0qydzanf2vvytlcf9p3gnq 192.168.3.20:2377
>>>
This node joined a swarm as a worker.

Server C、Server B作为工作节点。Server A作为管理节点。

docker-swarm.png

在管理节点上运行sudo docker node ls

ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
5t5680v5lu86zx8y3np4lz33x     baloneo             Ready               Active                                  19.03.6
7kk0huvknn6891vfc231lls97 *   baloneo             Ready               Active              Leader              19.03.6
jcdlrk389dvdl7otsjv4t7ixw     baloneo-pc          Ready               Active                                  19.03.6

在Server A(管理节点)：

sudo docker pull nginx

sudo docker service create --replicas 3 -p 80:80 --name nginx nginx

开启三个nginx负载，当我们开启之后，就已经实现了负载均衡了，访问任意一个节点的ip:80都会进行负载均衡

➜  feem http 192.168.3.246
HTTP/1.1 200 OK
Accept-Ranges: bytes
Connection: keep-alive
Content-Length: 18
Content-Type: text/html
Date: Wed, 24 Jun 2020 06:19:48 GMT
ETag: "5ef2b7c2-12"
Last-Modified: Wed, 24 Jun 2020 02:17:38 GMT
Server: nginx/1.19.0

<h1>Server C</h1>

➜  feem http 192.168.3.246
HTTP/1.1 200 OK
Accept-Ranges: bytes
Connection: keep-alive
Content-Length: 18
Content-Type: text/html
Date: Wed, 24 Jun 2020 06:19:50 GMT
ETag: "5ef2f07f-12"
Last-Modified: Wed, 24 Jun 2020 06:19:43 GMT
Server: nginx/1.19.0

<h1>Server B</h1>

➜  feem