181 lines
5.7 KiB
Markdown
181 lines
5.7 KiB
Markdown
# Swarm cluster
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This section explains how to create a multi-host [swarm](https://docs.docker.com/swarm) cluster using [docker-machine](https://docs.docker.com/machine/) and how to deploy Traefik on it.
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The cluster consists of:
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- 2 servers
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- 1 swarm master
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- 2 swarm nodes
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- 1 [overlay](https://docs.docker.com/network/overlay/) network (multi-host networking)
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## Prerequisites
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1. You need to install [docker-machine](https://docs.docker.com/machine/)
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2. You need the latest [VirtualBox](https://www.virtualbox.org/wiki/Downloads)
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## Cluster provisioning
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We first follow [this guide](https://docs.docker.com/engine/userguide/networking/get-started-overlay/) to create the cluster.
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### Create machine `mh-keystore`
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This machine is the service registry of our cluster.
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```shell
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docker-machine create -d virtualbox mh-keystore
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```
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Then we install the service registry [Consul](https://consul.io) on this machine:
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```shell
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eval "$(docker-machine env mh-keystore)"
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docker run -d \
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-p "8500:8500" \
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-h "consul" \
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progrium/consul -server -bootstrap
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```
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### Create machine `mhs-demo0`
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This machine is a swarm master and a swarm agent on it.
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```shell
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docker-machine create -d virtualbox \
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--swarm --swarm-master \
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--swarm-discovery="consul://$(docker-machine ip mh-keystore):8500" \
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--engine-opt="cluster-store=consul://$(docker-machine ip mh-keystore):8500" \
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--engine-opt="cluster-advertise=eth1:2376" \
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mhs-demo0
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```
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### Create machine `mhs-demo1`
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This machine have a swarm agent on it.
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```shell
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docker-machine create -d virtualbox \
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--swarm \
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--swarm-discovery="consul://$(docker-machine ip mh-keystore):8500" \
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--engine-opt="cluster-store=consul://$(docker-machine ip mh-keystore):8500" \
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--engine-opt="cluster-advertise=eth1:2376" \
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mhs-demo1
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```
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### Create the overlay Network
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Create the overlay network on the swarm master:
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```shell
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eval $(docker-machine env --swarm mhs-demo0)
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docker network create --driver overlay --subnet=10.0.9.0/24 my-net
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```
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## Deploy Traefik
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Deploy Traefik:
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```shell
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docker $(docker-machine config mhs-demo0) run \
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-d \
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-p 80:80 -p 8080:8080 \
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--net=my-net \
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-v /var/lib/boot2docker/:/ssl \
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traefik \
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-l DEBUG \
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-c /dev/null \
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--docker \
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--docker.domain=traefik \
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--docker.endpoint=tcp://$(docker-machine ip mhs-demo0):2376 \
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--docker.tls \
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--docker.tls.ca=/ssl/ca.pem \
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--docker.tls.cert=/ssl/server.pem \
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--docker.tls.key=/ssl/server-key.pem \
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--docker.tls.insecureSkipVerify \
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--docker.watch \
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--api
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```
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Let's explain this command:
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| Option | Description |
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|-------------------------------------------|---------------------------------------------------------------|
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| `-p 80:80 -p 8080:8080` | we bind ports 80 and 8080 |
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| `--net=my-net` | run the container on the network my-net |
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| `-v /var/lib/boot2docker/:/ssl` | mount the ssl keys generated by docker-machine |
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| `-c /dev/null` | empty config file |
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| `--docker` | enable docker provider |
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| `--docker.endpoint=tcp://172.18.0.1:2376` | connect to the swarm master using the docker_gwbridge network |
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| `--docker.tls` | enable TLS using the docker-machine keys |
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| `--api` | activate the webUI on port 8080 |
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## Deploy your apps
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We can now deploy our app on the cluster, here [whoami](https://github.com/containous/whoami), a simple web server in GO, on the network `my-net`:
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```shell
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eval $(docker-machine env --swarm mhs-demo0)
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docker run -d --name=whoami0 --net=my-net --env="constraint:node==mhs-demo0" containous/whoami
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docker run -d --name=whoami1 --net=my-net --env="constraint:node==mhs-demo1" containous/whoami
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```
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Check that everything is started:
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```shell
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docker ps
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```
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```
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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ba2c21488299 containous/whoami "/whoamI" 8 seconds ago Up 9 seconds 80/tcp mhs-demo1/whoami1
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8147a7746e7a containous/whoami "/whoamI" 19 seconds ago Up 20 seconds 80/tcp mhs-demo0/whoami0
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8fbc39271b4c traefik "/traefik -l DEBUG -c" 36 seconds ago Up 37 seconds 192.168.99.101:80->80/tcp, 192.168.99.101:8080->8080/tcp mhs-demo0/serene_bhabha
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```
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## Access to your apps through Traefik
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```shell
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curl -H Host:whoami0.traefik http://$(docker-machine ip mhs-demo0)
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```
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```yaml
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Hostname: 8147a7746e7a
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IP: 127.0.0.1
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IP: ::1
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IP: 10.0.9.3
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IP: fe80::42:aff:fe00:903
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IP: 172.18.0.3
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IP: fe80::42:acff:fe12:3
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GET / HTTP/1.1
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Host: 10.0.9.3:80
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User-Agent: curl/7.35.0
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Accept: */*
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Accept-Encoding: gzip
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X-Forwarded-For: 192.168.99.1
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X-Forwarded-Host: 10.0.9.3:80
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X-Forwarded-Proto: http
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X-Forwarded-Server: 8fbc39271b4c
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```
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```shell
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curl -H Host:whoami1.traefik http://$(docker-machine ip mhs-demo0)
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```
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```yaml
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Hostname: ba2c21488299
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IP: 127.0.0.1
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IP: ::1
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IP: 10.0.9.4
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IP: fe80::42:aff:fe00:904
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IP: 172.18.0.2
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IP: fe80::42:acff:fe12:2
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GET / HTTP/1.1
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Host: 10.0.9.4:80
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User-Agent: curl/7.35.0
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Accept: */*
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Accept-Encoding: gzip
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X-Forwarded-For: 192.168.99.1
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X-Forwarded-Host: 10.0.9.4:80
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X-Forwarded-Proto: http
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X-Forwarded-Server: 8fbc39271b4c
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```
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