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這篇文章給大家分享的是有關docker之如何實現點到點容器的網絡配置的內容。小編覺得挺實用的,因此分享給大家做個參考,一起跟隨小編過來看看吧。
一、搭建容器之間的網絡
1. 查看目前的網絡環境
[root@liuxin-test01 ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 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 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:ca:41:84 brd ff:ff:ff:ff:ff:ff inet 192.168.8.192/24 brd 192.168.8.255 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:feca:4184/64 scope link valid_lft forever preferred_lft forever 3: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000 link/ether 00:0c:29:ca:41:8e brd ff:ff:ff:ff:ff:ff 4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN link/ether 02:42:a3:f4:2f:40 brd ff:ff:ff:ff:ff:ff inet 172.17.0.1/16 scope global docker0 valid_lft forever preferred_lft forever inet6 fe80::42:a3ff:fef4:2f40/64 scope link valid_lft forever preferred_lft forever
2.創建兩個無網絡的容器
--rm 參數講解一下:
在Docker容器退出時,默認容器內部的文件系統仍然被保留,以方便調試并保留用戶數據。
但是,對于foreground容器,由于其只是在開發調試過程中短期運行,其用戶數據并無保留的必要,因而可以在容器啟動時設置--rm選項,這樣在容器退出時就能夠自動清理容器內部的文件系統。
--net=none 無網絡環境
--net=bridge 默認的參數,通過網橋(docker0)來設置容器的網絡。也可以通過DOCKER_OPTS選項的-b參數來指定默認網橋
--net=host 共享主機的網絡環境,不推薦這么設置
--net=container 兩個容器共享IP地址和端口號等網絡資源
下面兩個容器是在兩個終端中創建的
[root@liuxin-test01 ~]# docker run --rm -it --net=none --name='centos01' centos:7.4.1708 [root@f64cdc7ffff1 /]#
[root@liuxin-test01 ~]# docker run --rm -it --net=none --name='centos02' centos:7.4.1708 [root@cd4df383b68e /]#
3. 查看這兩個容器的進程ID
[root@liuxin-test01 ~]# docker inspect -f '{{.State.Pid}}' f64 21682 [root@liuxin-test01 ~]# docker inspect -f '{{.State.Pid}}' cd4 21832
4. 為這兩個容器創建虛擬的網絡空間
[root@liuxin-test01 ~]# mkdir -p /var/run/netns [root@liuxin-test01 ~]# ln -s /proc/21682/ns/net /var/run/netns/21682 [root@liuxin-test01 ~]# ln -s /proc/21832/ns/net /var/run/netns/21832 [root@liuxin-test01 ~]#
5. 創建一對veth,兩端命名為A、B
veth 是虛擬的以太設備,類似于網卡設備。這個是linux容器技術引進的,要求必須成對出現
[root@liuxin-test01 ~]# ip link add A type veth peer name B [root@liuxin-test01 ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 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 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:ca:41:84 brd ff:ff:ff:ff:ff:ff inet 192.168.8.192/24 brd 192.168.8.255 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:feca:4184/64 scope link valid_lft forever preferred_lft forever 3: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000 link/ether 00:0c:29:ca:41:8e brd ff:ff:ff:ff:ff:ff 4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN link/ether 02:42:a3:f4:2f:40 brd ff:ff:ff:ff:ff:ff inet 172.17.0.1/16 scope global docker0 valid_lft forever preferred_lft forever inet6 fe80::42:a3ff:fef4:2f40/64 scope link valid_lft forever preferred_lft forever 157: B@A: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN qlen 1000 link/ether de:f7:3b:24:a5:0e brd ff:ff:ff:ff:ff:ff 158: A@B: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN qlen 1000 link/ether 9a:65:96:de:04:90 brd ff:ff:ff:ff:ff:ff
6. 將兩端分別放到兩個容器中
我們可以看到,加入到容器之后,再次執行ip a 已經看不到這兩個設備了
[root@liuxin-test01 ~]# ip link set A netns 21682 [root@liuxin-test01 ~]# ip link set B netns 21832 [root@liuxin-test01 ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 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 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:ca:41:84 brd ff:ff:ff:ff:ff:ff inet 192.168.8.192/24 brd 192.168.8.255 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:feca:4184/64 scope link valid_lft forever preferred_lft forever 3: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000 link/ether 00:0c:29:ca:41:8e brd ff:ff:ff:ff:ff:ff 4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN link/ether 02:42:a3:f4:2f:40 brd ff:ff:ff:ff:ff:ff inet 172.17.0.1/16 scope global docker0 valid_lft forever preferred_lft forever inet6 fe80::42:a3ff:fef4:2f40/64 scope link valid_lft forever preferred_lft forever
7. 設置兩個容器網絡空間的ip
[root@liuxin-test01 ~]# ip netns exec 21682 ip addr add 192.168.99.1/32 dev A [root@liuxin-test01 ~]# ip netns exec 21832 ip addr add 192.168.99.2/32 dev B
8. 啟動兩個容器的網絡
[root@liuxin-test01 ~]# ip netns exec 21682 ip link set A up [root@liuxin-test01 ~]# ip netns exec 21832 ip link set B up
9. 給這兩個容器設置一下網關
[root@liuxin-test01 ~]# ip netns exec 21682 ip route add 192.168.99.2/32 dev A [root@liuxin-test01 ~]# ip netns exec 21832 ip route add 192.168.99.1/32 dev B
10. 測試
[root@f64cdc7ffff1 /]# ping 192.168.99.2 PING 192.168.99.2 (192.168.99.2) 56(84) bytes of data. 64 bytes from 192.168.99.2: icmp_seq=1 ttl=64 time=0.095 ms
[root@cd4df383b68e /]# ping 192.168.99.1 PING 192.168.99.1 (192.168.99.1) 56(84) bytes of data. 64 bytes from 192.168.99.1: icmp_seq=1 ttl=64 time=0.057 ms
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