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# Weave Net and Docker Swarm |
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This example show how-to setup a very simple Swarm cluster with Weave Net. |
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## Infratructure |
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There are two hosts that have a recent version of Docker Engine running. |
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These hosts are named `host1` and `host2`, and might have the following in |
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`/etc/hosts` or you just substitute IP addresses in the commands shown below. |
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``` |
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192.168.131.139 host1 |
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192.168.131.140 host2 |
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``` |
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## Install and launch Weave Net |
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To install Weave Net run the following commands on each of the hosts |
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``` |
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sudo curl --silent --location git.io/weave --output /usr/local/bin/weave |
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chmod +x /usr/local/bin/weave |
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``` |
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Now start the router on each of the host with |
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``` |
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weave luanch-router host1 host2 |
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``` |
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Proxy needs to be launched with the following arguments |
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``` |
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weave launch-proxy -H 0.0.0.0:12375 --no-detect-tls |
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``` |
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> You can omit `--no-detect-tls`, but in that case you might wish to omit |
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> all of the arugments. If so, you will need to ensure that TLS keys are |
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> in all the right places. |
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## Launch Swarm manger |
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Swarm manager can run very simply like this agains two of the host that |
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run Weave Net and the Docker API proxy is listening on port 12375: |
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``` |
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docker run -d -p 2377:2375 swarm manage nodes://host1:12375,host2:12375 |
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``` |
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> If you would like to use a different discovery mechanism, you can do this |
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> but then you will need run Swarm agents on each of the hosts and ensure |
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> that those are pointed at the address the proxy is listening on. This |
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> would typically mean `swarm join --addr <ip>:12375 <discovery>`. |
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## Ping Me, I am on Weave Net! |
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Let's start 20 containers via Swarm, on the same host the manager is running. |
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``` |
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for i in $(seq 20) |
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do docker -H 127.0.0.1:2377 run -td --name="pingme-${i}" --hostname="pingme.weave.local" centos:7 |
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done |
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``` |
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Check `weave status dns` and you will see there are 20 entries now. You can also |
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do a lookup with `weave dns-lookup pingme` a few times and see that shuffled IPs |
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are being returned each time. |
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Next, let's run the ping test like this: |
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``` |
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$ docker -H 127.0.0.1:2377 run -ti centos:7 |
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[root@4a73489ae22e /]# ping -c1 pingme |
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PING pingme.weave.local (10.40.0.5) 56(84) bytes of data. |
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64 bytes from pingme.weave.local (10.40.0.5): icmp_seq=1 ttl=64 time=1.12 ms |
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--- pingme.weave.local ping statistics --- |
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1 packets transmitted, 1 received, 0% packet loss, time 0ms |
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rtt min/avg/max/mdev = 1.128/1.128/1.128/0.000 ms |
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[root@4a73489ae22e /]# ping -c1 pingme |
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PING pingme.weave.local (10.40.0.2) 56(84) bytes of data. |
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64 bytes from pingme.weave.local (10.40.0.2): icmp_seq=1 ttl=64 time=9.34 ms |
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--- pingme.weave.local ping statistics --- |
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1 packets transmitted, 1 received, 0% packet loss, time 0ms |
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rtt min/avg/max/mdev = 9.345/9.345/9.345/0.000 ms |
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[root@4a73489ae22e /]# ping -c1 pingme |
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PING pingme.weave.local (10.32.0.1) 56(84) bytes of data. |
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64 bytes from pingme.weave.local (10.32.0.1): icmp_seq=1 ttl=64 time=0.166 ms |
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--- pingme.weave.local ping statistics --- |
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1 packets transmitted, 1 received, 0% packet loss, time 0ms |
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rtt min/avg/max/mdev = 0.166/0.166/0.166/0.000 ms |
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[root@4a73489ae22e /]# ping -c1 pingme |
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PING pingme.weave.local (10.32.0.8) 56(84) bytes of data. |
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64 bytes from pingme.weave.local (10.32.0.8): icmp_seq=1 ttl=64 time=0.162 ms |
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--- pingme.weave.local ping statistics --- |
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1 packets transmitted, 1 received, 0% packet loss, time 0ms |
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rtt min/avg/max/mdev = 0.162/0.162/0.162/0.000 ms |
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[root@4a73489ae22e /]# ping -c1 pingme |
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PING pingme.weave.local (10.40.0.4) 56(84) bytes of data. |
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64 bytes from pingme.weave.local (10.40.0.4): icmp_seq=1 ttl=64 time=0.987 ms |
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--- pingme.weave.local ping statistics --- |
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1 packets transmitted, 1 received, 0% packet loss, time 0ms |
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rtt min/avg/max/mdev = 0.987/0.987/0.987/0.000 ms |
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[root@4a73489ae22e /]# exit |
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``` |
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Now, just to convince yourself, run `docker -H 127.0.0.1:2377 ps` to check that all |
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of these 20 containers are on different hosts. |
errordeveloper revised this gist