第三章 Docker网络

# 创建两个network namespace
ip netns add ns1
ip netns add ns2# 创建成对的网卡设备
sudo ip link add veth-a type veth peer name veth-b# 将网卡分别放在两个namespace中
sudo ip link set veth-a netns ns1
sudo ip link set veth-b netns ns2# 启用两个网卡
sudo ip netns exec ns1 ip link set dev veth-a up
sudo ip netns exec ns2 ip link set dev veth-b up# 为两个网卡分配ip地址信息
sudo ip netns exec ns1 ip addr add 10.0.0.1/24 dev veth-a
sudo ip netns exec ns2 ip addr add 10.0.0.2/24 dev veth-b#验证网络连通性在ns1中执行ping veth-b
sudo ip netns exec ns1 ping 10.0.0.2

docker run -d -p 8500:8500 --restart=always --name=consul progrium/consul -server -bootstrap -advertise=172.17.0.200
# nohup consul agent -server -bootstrap -ui -data-dir /var/lib/consul -client=10.0.0.2 -bind=10.0.0.2 &> /var/log/consul.log &

systemctl status docker.service # 查看docker.service在什么位置
ExecStart=/usr/bin/dockerd -H fd:// --cluster-store=consul://172.17.0.200:8500 --cluster-advertise=ens33:2376
# ExecStart=/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2375 --cluster-store consul://10.0.0.2:8500 --cluster-advertise 10.0.0.2:2375
# ExecStart=/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2375 --cluster-store consul://10.0.0.2:8500 --cluster-advertise 10.0.0.3:2375

docker network create -d overlay ov1
root@node1:~# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
ba720f1ef854        bridge              bridge              local
5b69a097a085        host                host                local
9c19e28d7789        none                null                local
baa622c89664        ov1                 overlay             global *
root@master:~# docker network ls |grep ov1
baa622c89664        ov1                 overlay             global *
root@node2:/etc/apt# docker network ls | grep ov1
baa622c89664        ov1                 overlay             global *# check logs[node2]docker run -itd --name busybox01 --network=ov1 busybox
docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' f454d47dd873 ##查找ip
# error
docker: Error response from daemon: endpoint with name busybox01 already exists in network ov1.root@node1:~# docker run -itd --name busybox02 --network ov1 busybox
d7f1a2c5d81c33513269ba99306b6f5cb7f64e02ab7583552f8fe71aab719952
root@node1:~# docker exec busybox02 ping -c 4 busybox01
PING busybox01 (10.0.0.2): 56 data bytes
64 bytes from 10.0.0.2: seq=0 ttl=64 time=0.760 ms
64 bytes from 10.0.0.2: seq=1 ttl=64 time=0.521 ms

ln -s /var/run/docker/netns /var/run/netns
ip netns list

root@node2:~# ip link show ens33
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
   link/ether 00:0c:29:27:f1:72 brd ff:ff:ff:ff:ff:ffip link set ens33 promisc onroot@node2:~# ip link show ens33
2: ens33: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
   link/ether 00:0c:29:27:f1:72 brd ff:ff:ff:ff:ff:ffvmware/virtualbox也需要打开混杂模式

root@node1:~# docker network create -d macvlan --subnet=172.16.0.0/24 --gateway=172.16.0.1 -o parent=ens33 macnet01 #在node2上同样运行此命令
root@node1:~# docker network ls | grep macnet01
0f2f883adb06        macnet01            macvlan             localdocker run -itd --name busybox04 --ip 172.16.0.3 --network macnet01 busyboxroot@node1:~# docker exec busybox04 ping -c 4 172.17.0.4
root@node2:~# docker exec busybox05 ping -c 4 172.17.0.3