Consul&Nginx&Registrator&ConsulTemplate部署高可用負載均衡

1. Consul Server

建立consul server虛擬主機

docker-machine create consul
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出現以下內容即建立成功

Running pre-create checks...
Creating machine...
(consul) Copying /Users/enoch/.docker/machine/cache/boot2docker.iso to /Users/enoch/.docker/machine/machines/consul/boot2docker.iso...
(consul) Creating VirtualBox VM...
(consul) Creating SSH key...
(consul) Starting the VM...
(consul) Check network to re-create if needed...
(consul) Waiting for an IP...
Waiting for machine to be running, this may take a few minutes...
Detecting operating system of created instance...
Waiting for SSH to be available...
Detecting the provisioner...
Provisioning with boot2docker...
Copying certs to the local machine directory...
Copying certs to the remote machine...
Setting Docker configuration on the remote daemon...
Checking connection to Docker...
Docker is up and running!
To see how to connect your Docker Client to the Docker Engine running on this virtual machine, run: docker-machine env consul
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建立工做目錄consul

mkdir -p ~/workspace/consul && cd ~/workspace/consul
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建立docker-compose.yml

version: "3"

services:
 consul:
 image: consul:latest
 ports:
 - 8500:8500
 command: agent -server -bootstrap -ui -client=0.0.0.0 -node=server01
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切換環境到consul

eval $(docker-machine env consul)
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執行docker-compose.yml

docker-compose up -d
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查看虛擬主機IP

docker-machine ip consul
# output 192.168.99.103
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經過IP在瀏覽器訪問8500端口，便可看到Consul的UI界面

2. Nginx + Consul Template

建立反向代理虛擬主機

docker-machine create reverseproxy
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出現如下內容表明建立成功

Running pre-create checks...
Creating machine...
(reverseproxy) Copying /Users/enoch/.docker/machine/cache/boot2docker.iso to /Users/enoch/.docker/machine/machines/reverseproxy/boot2docker.iso...
(reverseproxy) Creating VirtualBox VM...
(reverseproxy) Creating SSH key...
(reverseproxy) Starting the VM...
(reverseproxy) Check network to re-create if needed...
(reverseproxy) Waiting for an IP...
Waiting for machine to be running, this may take a few minutes...
Detecting operating system of created instance...
Waiting for SSH to be available...
Detecting the provisioner...
Provisioning with boot2docker...
Copying certs to the local machine directory...
Copying certs to the remote machine...
Setting Docker configuration on the remote daemon...
Checking connection to Docker...
Docker is up and running!
To see how to connect your Docker Client to the Docker Engine running on this virtual machine, run: docker-machine env reverseproxy
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切換當前環境到虛擬主機

eval $(docker-machine env reverseproxy)
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建立工做目錄reverseproxy

mkdir -p ~/workspace/reverseproxy && cd ~/workspace/reverseproxy
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建立docker-compose.yml

version: "3"

services:
 nginx:
 image: nginx:latest
 ports:
 - 8081:80
 volumes:
 - ./nginx.conf:/etc/nginx/nginx.conf
 - ./conf.d:/etc/nginx/conf.d

 consul-template:
 image: hashicorp/consul-template:alpine
 volumes:
 - ./conf.d:/etc/nginx/conf.d
 command: consul-template --consul-addr 192.168.99.103:8500 --template "/etc/nginx/conf.d/nginx.ctmpl:/etc/nginx/conf.d/vhost.conf" --log-level=info
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把容器跑起來

docker-compose up -d
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查看IP

docker-machine ip reverseproxy
# output 192.168.99.102
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瀏覽器訪問reverseproxy的8081端口，出現以下內容表明啓動成功

3. Webserver搭建

建立虛擬主機webserver1

docker-machine create webserver1
eval $(docker-machine env webserver1)
mkdir webserver1 & cd webserver1
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建立docker—compose.yml

version: "3"

services:

 nginx1:
 image: nginx:latest
 ports:
 - 81:80

 nginx2:
 image: nginx:latest
 ports:
 - 82:80

 registrator:
 image: shaharil/registrator:latest
 volumes:
 - /var/run/docker.sock:/tmp/docker.sock
 command: consul://192.168.99.103:8500
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跑起來

docker-compose up -d
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打開reverseproxy/conf.d/vhost.conf能夠看到webserver啓動的nginxIP地址都被加了進去

upstream http_backend {
    
    server 172.18.0.2:81;
    
    server 172.18.0.3:82;
    
}

server {
    listen 8000;
    server_name localhost;
    location / {
        proxy_pass http://http_backend;
    }
}
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作個試驗，如今將其中一臺nginx容器關閉

eval $(docker-machine env webserver1)
docker stop webserver1_nginx2_1
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此時能夠看到vhost.conf中的IP被去掉了

upstream http_backend {
    
    server 172.18.0.2:81;
    
}

server {
    listen 8000;
    server_name localhost;
    location / {
        proxy_pass http://http_backend;
    }
}
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再將nginx容器打開，該容器的IP地址隨之也會被加進去

docker start webserver1_nginx2_1

//如下是文件內容
upstream http_backend {
    
    server 172.18.0.2:81;
    
}

server {
    listen 8000;
    server_name localhost;
    location / {
        proxy_pass http://http_backend;
    }
}
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