從零開始學習docker（八）多臺機器通訊

時間 2019-11-20

標籤開始學習 docker 多臺機器通訊欄目 Docker 简体版

原文原文鏈接

在上一節中，咱們介紹了在同一個機器裏面同一個docker裏面不一樣的容器如何進行通訊的。這一節咱們介紹如何在不一樣的Linux機器上面的容器通訊。node

分佈式存儲有不少工具，今天選擇etcd工具，這個是開源的免費分佈式存儲。linux

準備實驗環境：git

docker node1 ip: 192.168.0.109 github

docker node2 ip: 192.168.0.107docker

在docker node1 上,下載解壓https://github.com/etcd-io/etcd/releases/tag/v3.3.13ubuntu

vincent@swarm-manager:~/etcd-v3.3.13-linux-amd64$ nohup ./etcd --name docker-node1 --initial-advertise-peer-urls http://192.168.0.109:2380 \
> --listen-peer-urls http://192.168.0.109:2380 \
> --listen-client-urls http://192.168.0.109:2379,http://127.0.0.1:2379 \
> --advertise-client-urls http://192.168.0.109:2379 \
> --initial-cluster-token etcd-cluster \
> --initial-cluster docker-node1=http://192.168.0.109:2380,docker-node2=http://192.168.0.107:2380 \
> --initial-cluster-state new &
[1] 3870
vincent@swarm-manager:~/etcd-v3.3.13-linux-amd64$ nohup: ignoring input and appending output to 'nohup.out'

--name 表示這個名字是docker-node1bash

--initial-advertise-peer-urls 表示本地地址網絡

./etcdctl cluster-health
member 72400c6f5c5691f3 is healthy: got healthy result from http://172.16.247.131:2379
member dc0810ee9a06524d is healthy: got healthy result from http://172.16.247.132:2379
cluster is healthy

在docker node2上也去執行：app

wget https://github.com/coreos/etcd/releases/download/v3.0.12/etcd-v3.0.12-linux-amd64.tar.gz
vincent@swarm-worker-1:~/etcd-v3.3.13-linux-amd64$ ./etcd --name docker-node2 --initial-advertise-peer-urls http://192.168.0.107:2380 \
> --listen-peer-urls http://192.168.0.107:2380 \
> --listen-client-urls http://192.168.0.107:2379,http://127.0.0.1:2379 \
> --advertise-client-urls http://192.168.0.107:2379 \
> --initial-cluster-token etcd-cluster \
> --initial-cluster docker-node1=http://192.168.0.109:2380,docker-node2=http://192.168.0.107:2380 \
> --initial-cluster-state new &

如何肯定咱們的cluster已經成功創建了：tcp

在node1上執行：

vincent@swarm-manager:~/etcd-v3.3.13-linux-amd64$ ./etcdctl cluster-health
member beb7fd3596aa26eb is healthy: got healthy result from http://192.168.0.109:2379
member e6bdc10e37172e00 is healthy: got healthy result from http://192.168.0.107:2379
cluster is healthy

而後在node2上執行：

vincent@swarm-worker-1:~/etcd-v3.3.13-linux-amd64$ ./etcdctl cluster-health
member beb7fd3596aa26eb is healthy: got healthy result from http://192.168.0.109:2379
member e6bdc10e37172e00 is healthy: got healthy result from http://192.168.0.107:2379
cluster is healthy

這樣咱們就在兩臺機器上搭建了一個分佈式存儲

重啓docker服務

由於咱們要讓docker知道咱們要去使用分佈式存儲。

在docker-node1上執行：

vincent@swarm-manager:~/etcd-v3.3.13-linux-amd64$ sudo service docker stop
[sudo] password for vincent:
vincent@swarm-manager:~/etcd-v3.3.13-linux-amd64$ docker --version
Docker version 17.12.0-ce, build c97c6d6

而後手動啓動docker：

vincent@swarm-manager:~/etcd-v3.3.13-linux-amd64$ sudo /usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock --cluster-store=etcd://192.168.0.109:2379 --cluster-advertise=192.168.0.109:2375&
[2] 4153

在docker-node2上執行：

sudo service docker stop
sudo /usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock --cluster-store=etcd://192.168.0.109:2379 --cluster-advertise=192.168.0.109:2375&

建立overlay network

在docker-node1上建立一個demo的overlay network

sudo docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
f6acf1d69b7c        bridge              bridge              local
c051f46f8a15        host                host                local
4caf51fb3438        none                null                local

docker network create -d overlay demo
1607f5636b8515d7e06d2f13261d32d8370c72de99ffb688ccdce3f6d8bce898

docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
f6acf1d69b7c        bridge              bridge              local
1607f5636b85        demo                overlay             global
c051f46f8a15        host                host                local
4caf51fb3438        none                null                local

查看overlay網絡的詳細信息：

docker network inspect demo
[
    {
        "Name": "demo",
        "Id": "1607f5636b8515d7e06d2f13261d32d8370c72de99ffb688ccdce3f6d8bce898",
        "Created": "2019-07-01T07:52:43.137469208-07:00",
        "Scope": "global",
        "Driver": "overlay",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "10.0.0.0/24",
                    "Gateway": "10.0.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {},
        "Options": {},
        "Labels": {}
    }
]

咱們會看到在node2上，這個demo的overlay network會被同步建立:

docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
e944ecd3d81f        bridge              bridge              local
1607f5636b85        demo                overlay             global
ca2b5e91ee2f        host                host                local
cfb09007c0ce        none                null                local

建立鏈接demo網絡的容器

在docker-node1上建立容器：

docker run -d --name test1 --network demo vincent/ubuntu-base /bin/bash -c "while true; do sleep 3600; done"
c86061fd856cca0d157cc602cd9b98edd9f0fa4db9a26aa77ae2b054d6d804f1

docker container ls
CONTAINER ID        IMAGE                 COMMAND                  CREATED              STATUS              PORTS               NAMES
c86061fd856c        vincent/ubuntu-base   "/bin/bash -c 'while…"   About a minute ago   Up About a minute

查看test1的ip：

docker exec test1 ifconfig
eth0      Link encap:Ethernet  HWaddr 02:42:0a:00:00:02
          inet addr:10.0.0.2  Bcast:10.0.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1450  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

eth1      Link encap:Ethernet  HWaddr 02:42:ac:12:00:02
          inet addr:172.18.0.2  Bcast:172.18.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:16 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1308 (1.3 KB)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

在docker-node2上新建容器test2：

docker run -d --name test2 --network demo vincent/ubuntu-base /bin/bash -c "while true; do sleep 3600; done"
31f87913be02db7a8033b407c559a7a213445384d735239ff6504318c5077e46

在docker-node2上測試連通性

docker exec -it test2 ifconfig
eth0      Link encap:Ethernet  HWaddr 02:42:0a:00:00:03
          inet addr:10.0.0.3  Bcast:10.0.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1450  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

eth1      Link encap:Ethernet  HWaddr 02:42:ac:12:00:02
          inet addr:172.18.0.2  Bcast:172.18.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:16 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1308 (1.3 KB)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

這兩個container之間能夠連通。

https://blog.csdn.net/qq_37880968/article/details/86747883

https://www.imooc.com/article/47152

https://blog.csdn.net/u013641234/article/details/83964251