多容器復雜應用的部署

基于 flask容器，鏈接外部另一個redis 容器 docker pull redis sudo docker run -d --name redis redis # redis 沒必要映射端口出來創(chuàng)建flask鏡像 docker build -t kvin/flask-redis .鏡像名稱 Dockerfile的路徑 . 是當前目錄 運行容器并連接到數(shù)據(jù)庫 docker run -d --name flask-redis --link redis -e REDIS_HOST=redis kvin/flask-redis docker exec -it flask-redis /bin/bash FROM python:2.7 LABEL maintaner="Peng Xiao xiaoquwl@gmail.com" COPY . /app WORKDIR /app RUN pip install flask redis EXPOSE 5000 CMD [ "python", "app.py" ] Dockerfile app.py from flask import Flask from redis import Redisimport os import socketapp = Flask(__name__) redis = Redis(host=os.environ.get('REDIS_HOST', '127.0.0.1'), port=6379) @app.route('/')def hello():redis.incr('hits')return 'Hello Container World! I have been seen %s times and my hostname is %s.\n' % (redis.get('hits'),socket.gethostname())if __name__ == "__main__":app.run(host="0.0.0.0", port=5000, debug=True) app.py

容器內部環(huán)境變量

root@1cd379675b76:/app# ping redis PING redis (172.17.0.2) 56(84) bytes of data. 64 bytes from redis (172.17.0.2): icmp_seq=1 ttl=64 time=0.492 ms 64 bytes from redis (172.17.0.2): icmp_seq=2 ttl=64 time=0.134 ms 64 bytes from redis (172.17.0.2): icmp_seq=3 ttl=64 time=0.054 ms 64 bytes from redis (172.17.0.2): icmp_seq=4 ttl=64 time=0.134 ms ^C --- redis ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3000ms rtt min/avg/max/mdev = 0.054/0.203/0.492/0.170 ms 容器內部測試

沒有映射時，宿主本地訪問不了 [root@docker-node1 flask-redis]# curl 127.0.0.1:5000 curl: (7) Failed connect to 127.0.0.1:5000; Connection refused [root@docker-node1 flask-redis]# docker run -d -p 5000:5000 --name flask-redis --link redis -e REDIS_HOST=redis kvin/flask-redis 28ea7f498f5b9084935aa0a4fa0332aa56701a4357346b215cae689842f41fb1 [root@docker-node1 flask-redis]# curl 127.0.0.1:5000 Hello Container World! I have been seen 8 times and my hostname is 28ea7f498f5b. [root@docker-node1 flask-redis]# curl 127.0.0.1:5000 Hello Container World! I have been seen 9 times and my hostname is 28ea7f498f5b. [root@docker-node1 flask-redis]# curl 127.0.0.1:5000 Hello Container World! I have been seen 10 times and my hostname is 28ea7f498f5b. [root@docker-node1 flask-redis]# curl 127.0.0.1:5000 Hello Container World! I have been seen 11 times and my hostname is 28ea7f498f5b. 映射 sudo docker run -d --name test4 -e DK_NAME=lewen busybox /bin/sh -c "while true;do sleep 3600;done" [root@docker-node1 flask-redis]# docker exec -it test4 /bin/sh / # env HOSTNAME=e72d1e6b396a SHLVL=1 HOME=/root DK_NAME=lewen TERM=xterm PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin PWD=/ / # 啟動容器時，提前給容器設置環(huán)境變量

多機器通信

overlay

What is VXLAN and how it works?

https://www.evoila.de/2015/11/06/what-is-vxlan-and-how-it-works/

https://coreos.com/eted/

安裝 etcd

vagrant@docker-node1:~$ wget https://github.com/coreos/etcd/releases/download/v3.0.12/etcd-v3.0.12-linux-amd64.tar.gz vagrant@docker-node1:~$ tar zxvf etcd-v3.0.12-linux-amd64.tar.gzvagrant@docker-node1:~$ cd etcd-v3.0.12-linux-amd64vagrant@docker-node1:~$ nohup ./etcd --name docker-node1 --initial-advertise-peer-urls http://192.168.205.10:2380 \--listen-peer-urls http://192.168.205.10:2380 \--listen-client-urls http://192.168.205.10:2379,http://127.0.0.1:2379 \ --advertise-client-urls http://192.168.205.10:2379 \--initial-cluster-token etcd-cluster \--initial-cluster docker-node1=http://192.168.205.10:2380,docker-node2=http://192.168.205.11:2380 \--initial-cluster-state new& 在docker-node1上 vagrant@docker-node2:~$ wget https://github.com/coreos/etcd/releases/download/v3.0.12/etcd-v3.0.12-linux-amd64.tar.gz vagrant@docker-node2:~$ tar zxvf etcd-v3.0.12-linux-amd64.tar.gz vagrant@docker-node2:~$ cd etcd-v3.0.12-linux-amd64/vagrant@docker-node2:~$ nohup ./etcd --name docker-node2 --initial-advertise-peer-urls http://192.168.205.11:2380 \--listen-peer-urls http://192.168.205.11:2380 \--listen-client-urls http://192.168.205.11:2379,http://127.0.0.1:2379 \--advertise-client-urls http://192.168.205.11:2379 \--initial-cluster-token etcd-cluster \--initial-cluster docker-node1=http://192.168.205.10:2380,docker-node2=http://192.168.205.11:2380 \--initial-cluster-state new& 在docker-node2上 vagrant@docker-node2:~/etcd-v3.0.12-linux-amd64$ ./etcdctl cluster-health member 21eca106efe4caee is healthy: got healthy result from http://192.168.205.10:2379 member 8614974c83d1cc6d is healthy: got healthy result from http://192.168.205.11:2379 cluster is healthy 檢查cluster狀態(tài) 在docker-node1上 $ sudo service docker stop $ sudo /usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock --cluster-store=etcd://192.168.205.10:2379 --cluster-advertise=192.168.205.10:2375&在docker-node2上 $ sudo service docker stop $ sudo /usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock --cluster-store=etcd://192.168.205.11:2379 --cluster-advertise=192.168.205.11:2375& 重啟docker服務 在docker-node1上創(chuàng)建一個demo的overlay network vagrant@docker-node1:~$ sudo docker network ls NETWORK ID NAME DRIVER SCOPE 0e7bef3f143a bridge bridge local a5c7daf62325 host host local 3198cae88ab4 none null local vagrant@docker-node1:~$ sudo docker network create -d overlay demo 3d430f3338a2c3496e9edeccc880f0a7affa06522b4249497ef6c4cd6571eaa9 vagrant@docker-node1:~$ sudo docker network ls NETWORK ID NAME DRIVER SCOPE 0e7bef3f143a bridge bridge local 3d430f3338a2 demo overlay global a5c7daf62325 host host local 3198cae88ab4 none null local vagrant@docker-node1:~$ sudo docker network inspect demo [{"Name": "demo","Id": "3d430f3338a2c3496e9edeccc880f0a7affa06522b4249497ef6c4cd6571eaa9","Scope": "global","Driver": "overlay","EnableIPv6": false,"IPAM": {"Driver": "default","Options": {},"Config": [{"Subnet": "10.0.0.0/24","Gateway": "10.0.0.1/24"}]},"Internal": false,"Containers": {},"Options": {},"Labels": {}} ] 創(chuàng)建overlay network

我們會看到在node2上，這個demo的overlay network會被同步創(chuàng)建

vagrant@docker-node2:~$ sudo docker network ls NETWORK ID NAME DRIVER SCOPE c9947d4c3669 bridge bridge local 3d430f3338a2 demo overlay global fa5168034de1 host host local c2ca34abec2a none null local view

通過查看etcd的key-value, 我們獲取到，這個demo的network是通過etcd從node1同步到node2的

vagrant@docker-node2:~/etcd-v3.0.12-linux-amd64$ ./etcdctl ls /docker /docker/network /docker/nodes vagrant@docker-node2:~/etcd-v3.0.12-linux-amd64$ ./etcdctl ls /docker/nodes /docker/nodes/192.168.205.11:2375 /docker/nodes/192.168.205.10:2375 vagrant@docker-node2:~/etcd-v3.0.12-linux-amd64$ ./etcdctl ls /docker/network/v1.0/network /docker/network/v1.0/network/3d430f3338a2c3496e9edeccc880f0a7affa06522b4249497ef6c4cd6571eaa9 vagrant@docker-node2:~/etcd-v3.0.12-linux-amd64$ ./etcdctl get /docker/network/v1.0/network/3d430f3338a2c3496e9edeccc880f0a7affa06522b4249497ef6c4cd6571eaa9 | jq . {"addrSpace": "GlobalDefault","enableIPv6": false,"generic": {"com.docker.network.enable_ipv6": false,"com.docker.network.generic": {}},"id": "3d430f3338a2c3496e9edeccc880f0a7affa06522b4249497ef6c4cd6571eaa9","inDelete": false,"ingress": false,"internal": false,"ipamOptions": {},"ipamType": "default","ipamV4Config": "[{\"PreferredPool\":\"\",\"SubPool\":\"\",\"Gateway\":\"\",\"AuxAddresses\":null}]","ipamV4Info": "[{\"IPAMData\":\"{\\\"AddressSpace\\\":\\\"GlobalDefault\\\",\\\"Gateway\\\":\\\"10.0.0.1/24\\\",\\\"Pool\\\":\\\"10.0.0.0/24\\\"}\",\"PoolID\":\"GlobalDefault/10.0.0.0/24\"}]","labels": {},"name": "demo","networkType": "overlay","persist": true,"postIPv6": false,"scope": "global" } view

創(chuàng)建連接demo網(wǎng)絡的容器

vagrant@docker-node1:~$ sudo docker run -d --name test1 --net demo busybox sh -c "while true; do sleep 3600; done" Unable to find image 'busybox:latest' locally latest: Pulling from library/busybox 56bec22e3559: Pull complete Digest: sha256:29f5d56d12684887bdfa50dcd29fc31eea4aaf4ad3bec43daf19026a7ce69912 Status: Downloaded newer image for busybox:latest a95a9466331dd9305f9f3c30e7330b5a41aae64afda78f038fc9e04900fcac54 vagrant@docker-node1:~$ sudo docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES a95a9466331d busybox "sh -c 'while true; d" 4 seconds ago Up 3 seconds test1 vagrant@docker-node1:~$ sudo docker exec test1 ifconfig eth0 Link encap:Ethernet HWaddr 02:42:0A:00:00:02inet addr:10.0.0.2 Bcast:0.0.0.0 Mask:255.255.255.0inet6 addr: fe80::42:aff:fe00:2/64 Scope:LinkUP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1RX packets:15 errors:0 dropped:0 overruns:0 frame:0TX packets:8 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:0RX bytes:1206 (1.1 KiB) TX bytes:648 (648.0 B) ? eth1 Link encap:Ethernet HWaddr 02:42:AC:12:00:02inet addr:172.18.0.2 Bcast:0.0.0.0 Mask:255.255.0.0inet6 addr: fe80::42:acff:fe12:2/64 Scope:LinkUP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1RX packets:8 errors:0 dropped:0 overruns:0 frame:0TX packets:8 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:0RX bytes:648 (648.0 B) TX bytes:648 (648.0 B) ? lo Link encap:Local Loopbackinet addr:127.0.0.1 Mask:255.0.0.0inet6 addr: ::1/128 Scope:HostUP LOOPBACK RUNNING MTU:65536 Metric:1RX packets:0 errors:0 dropped:0 overruns:0 frame:0TX packets:0 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:1RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) ? 在docker-node1上 在docker-node2上 vagrant@docker-node2:~$ sudo docker run -d --name test1 --net demo busybox sh -c "while true; do sleep 3600; done" Unable to find image 'busybox:latest' locally latest: Pulling from library/busybox 56bec22e3559: Pull complete Digest: sha256:29f5d56d12684887bdfa50dcd29fc31eea4aaf4ad3bec43daf19026a7ce69912 Status: Downloaded newer image for busybox:latest fad6dc6538a85d3dcc958e8ed7b1ec3810feee3e454c1d3f4e53ba25429b290b docker: Error response from daemon: service endpoint with name test1 already exists. vagrant@docker-node2:~$ sudo docker run -d --name test2 --net demo busybox sh -c "while true; do sleep 3600; done" 9d494a2f66a69e6b861961d0c6af2446265bec9b1d273d7e70d0e46eb2e98d20 在docker-node2上 vagrant@docker-node2:~$ sudo docker exec -it test2 ifconfig eth0 Link encap:Ethernet HWaddr 02:42:0A:00:00:03inet addr:10.0.0.3 Bcast:0.0.0.0 Mask:255.255.255.0inet6 addr: fe80::42:aff:fe00:3/64 Scope:LinkUP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1RX packets:208 errors:0 dropped:0 overruns:0 frame:0TX packets:201 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:0RX bytes:20008 (19.5 KiB) TX bytes:19450 (18.9 KiB) ? eth1 Link encap:Ethernet HWaddr 02:42:AC:12:00:02inet addr:172.18.0.2 Bcast:0.0.0.0 Mask:255.255.0.0inet6 addr: fe80::42:acff:fe12:2/64 Scope:LinkUP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1RX packets:8 errors:0 dropped:0 overruns:0 frame:0TX packets:8 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:0RX bytes:648 (648.0 B) TX bytes:648 (648.0 B) ? lo Link encap:Local Loopbackinet addr:127.0.0.1 Mask:255.0.0.0inet6 addr: ::1/128 Scope:HostUP LOOPBACK RUNNING MTU:65536 Metric:1RX packets:0 errors:0 dropped:0 overruns:0 frame:0TX packets:0 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:1RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) ?vagrant@docker-node1:~$ sudo docker exec test1 sh -c "ping 10.0.0.3"PING 10.0.0.3 (10.0.0.3): 56 data bytes64 bytes from 10.0.0.3: seq=0 ttl=64 time=0.579 ms64 bytes from 10.0.0.3: seq=1 ttl=64 time=0.411 ms64 bytes from 10.0.0.3: seq=2 ttl=64 time=0.483 ms^Cvagrant@docker-node1:~$ 驗證連通性

[root@docker-node2 etcd-v3.0.12-linux-amd64]# docker run -d --name test1 --net demo busybox /bin/sh -c "while true;do sleep 3600;done"

到此位于不同機器上的docker容器通信完成

可以看到容器，分別有兩個網(wǎng)卡 10.0.0.0/24 是基于demo網(wǎng)絡的虛擬IP

172.xx.xx.xx 是分別宿主機基于 docker網(wǎng)橋的ip

查看網(wǎng)絡中的容器

總結

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