docker之點到點的容器網(wǎng)絡(luò)的配置

更新時間：2018年03月22日 10:07:16 作者：小小運維

本篇文章主要介紹了docker之點到點的容器網(wǎng)絡(luò)的配置，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

一、搭建容器之間的網(wǎng)絡(luò)

1. 查看目前的網(wǎng)絡(luò)環(huán)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: eth1: <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(chuàng)建兩個無網(wǎng)絡(luò)的容器

--rm 參數(shù)講解一下：

在Docker容器退出時，默認容器內(nèi)部的文件系統(tǒng)仍然被保留，以方便調(diào)試并保留用戶數(shù)據(jù)。

但是，對于foreground容器，由于其只是在開發(fā)調(diào)試過程中短期運行，其用戶數(shù)據(jù)并無保留的必要，因而可以在容器啟動時設(shè)置--rm選項，這樣在容器退出時就能夠自動清理容器內(nèi)部的文件系統(tǒng)。

--net=none 無網(wǎng)絡(luò)環(huán)境
--net=bridge 默認的參數(shù)，通過網(wǎng)橋（docker0）來設(shè)置容器的網(wǎng)絡(luò)。也可以通過DOCKER_OPTS選項的-b參數(shù)來指定默認網(wǎng)橋
--net=host 共享主機的網(wǎng)絡(luò)環(huán)境，不推薦這么設(shè)置
--net=container 兩個容器共享IP地址和端口號等網(wǎng)絡(luò)資源

下面兩個容器是在兩個終端中創(chuàng)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(chuàng)建虛擬的網(wǎng)絡(luò)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(chuàng)建一對veth，兩端命名為A、B

veth 是虛擬的以太設(shè)備，類似于網(wǎng)卡設(shè)備。這個是linux容器技術(shù)引進的，要求必須成對出現(xiàn)

[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: eth1: <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(zhí)行ip a 已經(jīng)看不到這兩個設(shè)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: eth1: <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(shè)置兩個容器網(wǎng)絡(luò)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(wǎng)絡(luò)

[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(shè)置一下網(wǎng)關(guān)

[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

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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