Docker Networknode
單機網絡nginx
Bridge Network
Host Network
None Networkweb
多機網絡:overlay Networkdocker
網絡的分層網絡
公有IP和私有IPide
Public IP:互聯網上的惟一標識,能夠訪問internetoop
Private IP:不可在互聯網上使用,僅供機構內部使用測試
A類10.0.0.0--10.255.255.255(10.0.0.0/8)spa
B類172.16.0.0--172.31.255.255(172.16.0.0/12)vagrant
C類192.168.0.0--192.168.255.255(192.168.0.0/16)
Ping和telnet
Ping(ICMP):驗證IP的可達性
Linux Network Namespace
查看當前網絡命名空間 [root@docker-node1 vagrant]# ip netns list 添加網絡命名空間 [root@docker-node1 vagrant]# ip netns add test1 [root@docker-node1 vagrant]# ip netns add test2 [root@docker-node1 vagrant]# ip netns list test2 test1 [root@docker-node1 vagrant]# sudo ip netns exec test1 ip link 1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 [root@docker-node1 vagrant]# sudo ip netns exec test1 ip link set dev lo up [root@docker-node1 vagrant]# sudo ip netns exec test1 ip link 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 [root@docker-node2 vagrant]# ip netns exec test1 ip link 1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 [root@docker-node2 vagrant]# sudo ip link set veth-test1 netns test1 [root@docker-node2 vagrant]# ip netns exec test1 ip link 1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 6: veth-test1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000 link/ether 36:2d:2a:23:8e:af brd ff:ff:ff:ff:ff:ff
添加了一個test2的網絡命名空間 [root@docker-node2 vagrant]# ip netns add test2 綁定到veth-test2的設備 [root@docker-node2 vagrant]# sudo ip link set veth-test2 netns test2 查看命名空間的ip link [root@docker-node2 vagrant]# ip netns exec test2 ip link 1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 5: veth-test2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000 link/ether 2e:00:77:8a:33:57 brd ff:ff:ff:ff:ff:ff 給網絡命名空間添加ip並綁定 sudo ip netns exec test1 ip addr add 192.168.1.1/24 dev veth-testl sudo ip netns exec test2 ip addr add 192.168.1.2/24 dev veth-test2 將兩個網絡命名空間綁定的ip設備啓動 sudo ip netns exec test1 ip link set dev veth-testl up sudo ip netns exec test2 ip link set dev veth-test2 up 查看完整的命名空間ip信息 [root@docker-node2 vagrant]# ip netns exec test1 ip a 1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 6: veth-testl: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 36:2d:2a:23:8e:af brd ff:ff:ff:ff:ff:ff inet 192.168.1.1/24 scope global veth-testl valid_lft forever preferred_lft forever inet6 fe80::342d:2aff:fe23:8eaf/64 scope link valid_lft forever preferred_lft forever [root@docker-node2 vagrant]# ip netns exec test2 ip a 1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 5: veth-test2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 2e:00:77:8a:33:57 brd ff:ff:ff:ff:ff:ff inet 192.168.1.2/24 scope global veth-test2 valid_lft forever preferred_lft forever inet6 fe80::2c00:77ff:fe8a:3357/64 scope link valid_lft forever preferred_lft forever 測試命名空間的 互通性 ping [root@docker-node2 vagrant]# ip netns exec test2 ping 192.168.1.1 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. 64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=0.050 ms 64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.110 ms 64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.202 ms 64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=0.052 ms 64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=0.040 ms
每一個容器之間有獨立的命名空間(ip),相互之間能夠ping 通,
Docker Bridge0 在宿主機上橋接出來的一塊命名空間,一般爲 172.17.0.2, 裏面容器的ip通常在該網段隨機分佈。除非容器暴露了外面的,不然外面宿主機不能訪問
[root@docker-node2 ~]# sudo docker run -d --name test1 busybox /bin/sh -c "while true;do sleep 3600;done" 8f7cbad560db6d4c604395f3ee16c15d6fc4073e3010134e2520aed780b6198d [root@docker-node2 ~]# docker exec test1 ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever 9: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff inet 172.17.0.2/16 brd 172.17.255.255 scope global eth0 valid_lft forever preferred_lft forever 查看網橋 brctl show
新建立一個容器,新增了一個命名空間
查看網橋
新建立一個容器後,會在網橋上有一個新的接口
通訊
在docker0網橋上面建立的容器關聯 [vagrantedocker-node1~]# sudo docker run -d --name test2 --link test1 busybox /bin/sh -c "while true;do sleep 3600;done" test2 link test1 容器test2 link 容器test1 2 --> 1 ping 通 1 --> 2 ping 不通 建立網橋 [root@docker-node2 ~]# docker network create -d bridge my-bridge d7b1a39ddd6cd0fff8a7f2ff57a3391e9ac68f8bf09b05460f7d1200c712bc78 [root@docker-node2 ~]# brctl show bridge name bridge id STP enabled interfaces br-d7b1a39ddd6c 8000.0242ed73f4fa no docker0 8000.02420e28dc52 no veth8bb0084 vethced44cb [root@docker-node2 ~]# docker network ls NETWORK ID NAME DRIVER SCOPE 0e7556320fdd bridge bridge local 0b32df326904 host host local d7b1a39ddd6c my-bridge bridge local e2db49527111 none null local [root@docker-node2 ~]# sudo docker run -d --name test3 --network my-bridge busybox /bin/sh -c "while true;do sleep 3600;done" 7eb76c6ca9f6123811fc75cae03e571f669b308c2b6bad0cfbdd598508629f0d [root@docker-node2 ~]# brctl show bridge name bridge id STP enabled interfaces br-d7b1a39ddd6c 8000.0242ed73f4fa no vethee72a47 docker0 8000.02420e28dc52 no veth8bb0084 vethced44cb
docker network inspect my-bridge
sudo docker run -d --name test3 --network my-bridge busybox /bin/sh -c "while true;do sleep 3600;done"
test2 和 test 3 在同一個網橋my-bridge (本身建立的),能夠經過名稱ping
docker inspect my-bridge
總結
docker network connect my-bridge test1
tes2和test 1在docker 默認的bridge上
可是互相只能經過ip來ping通
不能經過名字
本身建立的bridge 可以解決互相ip,名字都ping通
容器的端口映射
docker run --name web -d -p 80:80 nginx
Container Port Map 端口映射
1. none 沒有ip,只有宿主能夠訪問
[vagrant@docker-node1~]$ sudo docker run -d --name test1 --network none busybox /bin/sh -c "while true;do sleep 3600;done"
da2143722efb01827070a4aa5ce52857f9269f5ed20f65f4cb39977d39141913
誰都不能訪問,只能 sudo docker exec -it test1 /bin/sh
2. host 共享主機的網絡
[vagrant@docker-node1 ~]$ sudo docker run -d --name test1 --network host busybox /bin/sh -c "while true;do sleep 3600;done"
18e175e07b5e15c941f848fa5d4105357d70dd0f03f8bdb55791c0997875074b
容器內部網絡跟宿主機同樣