[Docker Network] docker across the host network ovs gre test 2

Others 2019-06-15 18:35:08 views: null

1 Introduction

Paper undertake the above [docker network] docker across the host network 1 ovs gre test , gre will ovs use the container to achieve docker access across hosts continue testing. [Docker network] docker across the host network ovs gre test 1 in the same container network a subnet, it will test how the container in a different subnet.

Docker need to have a basic understanding of network type, refer to [mydocker] --- 4 network model and the implementation of the principle of docker (1) and [mydocker] --- 4 network model and the implementation of the principle of docker (2) .

1.1 Current Environment

vm1

[root@vm1 ~]# cat /proc/sys/net/ipv4/ip_forward
0
[root@vm1 ~]# iptables -t nat -F
[root@vm1 ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.19.0.1      0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.19.0.0      0.0.0.0         255.255.240.0   U     0      0        0 eth0
[root@vm1 ~]# ovs-vsctl show
91e815a1-1021-4c97-a21c-893ab8c28e37
    ovs_version: "2.5.1"
[root@vm1 ~]#

vm2

[root@vm2 ~]# echo 0 > /proc/sys/net/ipv4/ip_forward
[root@vm2 ~]# 
[root@vm2 ~]# cat /proc/sys/net/ipv4/ip_forward
0
[root@vm2 ~]# iptables -t nat -F
[root@vm2 ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.19.0.1      0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.19.0.0      0.0.0.0         255.255.240.0   U     0      0        0 eth0
[root@vm2 ~]# ovs-vsctl show
533800d4-246f-4099-a776-8254610db91f
    ovs_version: "2.5.1"
[root@vm2 ~]#

2. ovs container in a different subnet

Set in 2.1 vm1

[root@vm1 ~]# ip link add docker0 type bridge
[root@vm1 ~]# ip addr add 172.17.1.254/24 dev docker0
[root@vm1 ~]# ip link set docker0 up
[root@vm1 ~]# ip netns add ns1
[root@vm1 ~]# ip link add veth0 type veth peer name veth1
[root@vm1 ~]# brctl addif docker0 veth0
[root@vm1 ~]# ip link set veth1 netns ns1
[root@vm1 ~]# ip link set veth0 up
[root@vm1 ~]# ip netns exec ns1 sh
sh-4.2# ip addr add 172.17.1.1/24 dev veth1
sh-4.2# ip link set veth1 up
sh-4.2# ip link set lo up
sh-4.2# route add default gw 172.17.1.254
sh-4.2# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.17.1.254    0.0.0.0         UG    0      0        0 veth1
172.17.1.0      0.0.0.0         255.255.255.0   U     0      0        0 veth1
sh-4.2# ping -c 1 172.17.1.254
PING 172.17.1.254 (172.17.1.254) 56(84) bytes of data.
64 bytes from 172.17.1.254: icmp_seq=1 ttl=64 time=0.078 ms

--- 172.17.1.254 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.078/0.078/0.078/0.000 ms
sh-4.2# ping -c 1 172.19.0.12
PING 172.19.0.12 (172.19.0.12) 56(84) bytes of data.
64 bytes from 172.19.0.12: icmp_seq=1 ttl=64 time=0.048 ms

--- 172.19.0.12 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.048/0.048/0.048/0.000 ms
sh-4.2# exit
exit
[root@vm1 ~]#

Set in 2.2 vm2

[root@vm2 ~]# ip link add docker0 type bridge
[root@vm2 ~]# ip addr add 192.168.2.254/24 dev docker0
[root@vm2 ~]# ip link set docker0 up
[root@vm2 ~]# ip netns add ns1
[root@vm2 ~]# ip link add veth0 type veth peer name veth1
[root@vm2 ~]# brctl addif docker0 veth0
[root@vm2 ~]# ip link set veth1 netns ns1
[root@vm2 ~]# ip link set veth0 up
[root@vm2 ~]# ip netns exec ns1 sh
sh-4.2# ip addr add 192.168.2.1/24 dev veth1
sh-4.2# ip link set veth1 up
sh-4.2# ip link set lo up
sh-4.2# route add default gw 192.168.2.254
sh-4.2# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.2.254   0.0.0.0         UG    0      0        0 veth1
192.168.2.0     0.0.0.0         255.255.255.0   U     0      0        0 veth1
sh-4.2# ping -c 1 192.168.2.254
PING 192.168.2.254 (192.168.2.254) 56(84) bytes of data.
64 bytes from 192.168.2.254: icmp_seq=1 ttl=64 time=0.052 ms

--- 192.168.2.254 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.052/0.052/0.052/0.000 ms
sh-4.2# ping -c 1 172.19.0.8
PING 172.19.0.8 (172.19.0.8) 56(84) bytes of data.
64 bytes from 172.19.0.8: icmp_seq=1 ttl=64 time=0.031 ms

--- 172.19.0.8 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.031/0.031/0.031/0.000 ms
sh-4.2# exit
exit
[root@vm2 ~]#
11177530-1dd8c80f08b2d18a.png
Pictures .png

2.3 Configuration join gre

It is clear that the current two containers is pingunreasonable.

[root@vm1 ~]# ping -c 1 192.168.2.254
PING 192.168.2.254 (192.168.2.254) 56(84) bytes of data.

--- 192.168.2.254 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

[root@vm1 ~]# ping -c 1 192.168.2.1
PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data.

--- 192.168.2.1 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

[root@vm1 ~]#
2.3.1 increase a bridge ovs

vm1

[root@vm1 ~]# ovs-vsctl add-br ovs1
[root@vm1 ~]# 
[root@vm1 ~]# ovs-vsctl add-port ovs1 rou1 -- set interface rou1 type=internal
[root@vm1 ~]# 
[root@vm1 ~]# ifconfig rou1 192.168.1.1/24
[root@vm1 ~]# 
[root@vm1 ~]# ovs-vsctl show
91e815a1-1021-4c97-a21c-893ab8c28e37
    Bridge "ovs1"
        Port "rou1"
            Interface "rou1"
                type: internal
        Port "ovs1"
            Interface "ovs1"
                type: internal
    ovs_version: "2.5.1"
[root@vm1 ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.19.0.1      0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.17.1.0      0.0.0.0         255.255.255.0   U     0      0        0 docker0
172.19.0.0      0.0.0.0         255.255.240.0   U     0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 rou1
[root@vm1 ~]#

vm2

[root@vm2 ~]# ovs-vsctl add-br ovs2
[root@vm2 ~]# ovs-vsctl add-port ovs2 rou2 -- set interface rou2 type=internal
[root@vm2 ~]# ifconfig rou2 192.168.1.2/24
[root@vm2 ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.19.0.1      0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.19.0.0      0.0.0.0         255.255.240.0   U     0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 rou2
192.168.2.0     0.0.0.0         255.255.255.0   U     0      0        0 docker0
[root@vm2 ~]# ovs-vsctl show
533800d4-246f-4099-a776-8254610db91f
    Bridge "ovs2"
        Port "rou2"
            Interface "rou2"
                type: internal
        Port "ovs2"
            Interface "ovs2"
                type: internal
    ovs_version: "2.5.1"

Access vm2 in rou2 in vm1

[root@vm1 ~]# ping -c 1 192.168.1.1
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=0.036 ms

--- 192.168.1.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.036/0.036/0.036/0.000 ms
[root@vm1 ~]# ping -c 1 192.168.1.2
PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data.
From 192.168.1.1 icmp_seq=1 Destination Host Unreachable

--- 192.168.1.2 ping statistics ---
1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms

[root@vm1 ~]#
11177530-94ffd040294f174b.png
Pictures .png
2.3.2 added gre tunnel

vm1

[root@vm1 ~]# ovs-vsctl add-port ovs1 gre1 -- set interface gre1 type=gre options:remote_ip=172.19.0.8
[root@vm1 ~]# 
[root@vm1 ~]# ovs-vsctl show
91e815a1-1021-4c97-a21c-893ab8c28e37
    Bridge "ovs1"
        Port "gre1"
            Interface "gre1"
                type: gre
                options: {remote_ip="172.19.0.8"}
        Port "rou1"
            Interface "rou1"
                type: internal
        Port "ovs1"
            Interface "ovs1"
                type: internal
    ovs_version: "2.5.1"
[root@vm1 ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.19.0.1      0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.17.1.0      0.0.0.0         255.255.255.0   U     0      0        0 docker0
172.19.0.0      0.0.0.0         255.255.240.0   U     0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 rou1

vm2

[root@vm2 ~]# ovs-vsctl add-port ovs2 gre2 -- set interface gre2 type=gre options:remote_ip=172.19.0.12
[root@vm2 ~]# ovs-vsctl show
533800d4-246f-4099-a776-8254610db91f
    Bridge "ovs2"
        Port "gre2"
            Interface "gre2"
                type: gre
                options: {remote_ip="172.19.0.12"}
        Port "rou2"
            Interface "rou2"
                type: internal
        Port "ovs2"
            Interface "ovs2"
                type: internal
    ovs_version: "2.5.1"
[root@vm2 ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.19.0.1      0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.19.0.0      0.0.0.0         255.255.240.0   U     0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 rou2
192.168.2.0     0.0.0.0         255.255.255.0   U     0      0        0 docker0
[root@vm2 ~]#
11177530-3907e66882e864d0.png
Pictures .png

test

// 访问vm2中的rou2
[root@vm1 ~]# ping -c 1 192.168.1.2
PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data.
64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=1.30 ms

--- 192.168.1.2 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.309/1.309/1.309/0.000 ms
// 访问本机中的rou1
[root@vm1 ~]# ping -c 1 192.168.1.1
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=0.026 ms

--- 192.168.1.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.026/0.026/0.026/0.000 ms
[root@vm1 ~]#

vm2

// 访问vm1中的rou1
[root@vm2 ~]# ping -c 1 192.168.1.1
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=0.691 ms

--- 192.168.1.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.691/0.691/0.691/0.000 ms
// 访问本机中的rou2
[root@vm2 ~]# ping -c 1 192.168.1.2
PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data.
64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=0.028 ms

--- 192.168.1.2 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.028/0.028/0.028/0.000 ms
[root@vm2 ~]#
2.3.3 The ovs bound to docker0 in

vm1

[root@vm1 ~]# brctl addif docker0 ovs1
[root@vm1 ~]# ip link set ovs1 up
[root@vm1 ~]# bridge link
16: veth0 state UP @(null): <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master docker0 state forwarding priority 32 cost 2 
22: ovs1 state UNKNOWN : <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master docker0 state forwarding priority 32 cost 100 
[root@vm1 ~]#

vm2

[root@vm2 ~]# brctl addif docker0 ovs2
[root@vm2 ~]# ip link set ovs2 up
[root@vm2 ~]# bridge link
16: veth0 state UP @(null): <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master docker0 state forwarding priority 32 cost 2 
22: ovs2 state UNKNOWN : <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master docker0 state forwarding priority 32 cost 100 
[root@vm1 ~]#
11177530-5e1bb4cafe5c4115.png
Pictures .png

Test, or ping nowhere, because not on the same network, in [[docker network] ovs gre test 1] has been tested.

[root@vm1 ~]# ping -c 1 192.168.2.1
PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data.

--- 192.168.2.1 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

[root@vm1 ~]# ping -c 1 192.168.2.254
PING 192.168.2.254 (192.168.2.254) 56(84) bytes of data.

--- 192.168.2.254 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

[root@vm1 ~]#
2.3.4 Adding Routing

vm1

[root@vm1 ~]# route add -net 192.168.2.0/24 dev rou1
[root@vm1 ~]# 
[root@vm1 ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.19.0.1      0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.17.1.0      0.0.0.0         255.255.255.0   U     0      0        0 docker0
172.19.0.0      0.0.0.0         255.255.240.0   U     0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 rou1
192.168.2.0     0.0.0.0         255.255.255.0   U     0      0        0 rou1

vm2

[root@vm2 ~]# route add -net 172.17.1.0/24 dev rou2
[root@vm2 ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.19.0.1      0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.17.1.0      0.0.0.0         255.255.255.0   U     0      0        0 rou2
172.19.0.0      0.0.0.0         255.255.240.0   U     0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 rou2
192.168.2.0     0.0.0.0         255.255.255.0   U     0      0        0 docker0
[root@vm2 ~]#

Test access from the vm1

// ping vm2中的rou2可以通 
[root@vm1 ~]# ping -c 1 192.168.2.254
PING 192.168.2.254 (192.168.2.254) 56(84) bytes of data.
64 bytes from 192.168.2.254: icmp_seq=1 ttl=64 time=1.11 ms

--- 192.168.2.254 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.111/1.111/1.111/0.000 ms
// ping vm2中的ns1不通 因为vm2中没有开通ip_forward功能
[root@vm1 ~]# ping -c 1 192.168.2.1
PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data.

--- 192.168.2.1 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

Ip_forward added functionality in vm2

[root@vm2 ~]# echo 1 > /proc/sys/net/ipv4/ip_forward

Test again

[root@vm1 ~]# ping -c 1 192.168.2.1
PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data.
64 bytes from 192.168.2.1: icmp_seq=1 ttl=63 time=0.709 ms

--- 192.168.2.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.709/0.709/0.709/0.000 ms

By the same token, also you need to join ip_forward function vm1

[root@vm1 ~]# echo 1 > /proc/sys/net/ipv4/ip_forward
11177530-66971f5380f9ee70.png
Pictures .png
Access between the container 2.3.5
[root@vm1 ~]# ip netns exec ns1 sh
sh-4.2# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.17.1.254    0.0.0.0         UG    0      0        0 veth1
172.17.1.0      0.0.0.0         255.255.255.0   U     0      0        0 veth1
// 访问本机的docker0
sh-4.2# ping -c 1 172.17.1.254
PING 172.17.1.254 (172.17.1.254) 56(84) bytes of data.
64 bytes from 172.17.1.254: icmp_seq=1 ttl=64 time=0.050 ms

--- 172.17.1.254 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.050/0.050/0.050/0.000 ms
// 访问本机的ns1
sh-4.2# ping -c 1 172.17.1.1
PING 172.17.1.1 (172.17.1.1) 56(84) bytes of data.
64 bytes from 172.17.1.1: icmp_seq=1 ttl=64 time=0.026 ms

--- 172.17.1.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.026/0.026/0.026/0.000 ms
// 访问本机的ip
sh-4.2# ping -c 1 172.19.0.12
PING 172.19.0.12 (172.19.0.12) 56(84) bytes of data.
64 bytes from 172.19.0.12: icmp_seq=1 ttl=64 time=0.038 ms

--- 172.19.0.12 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.038/0.038/0.038/0.000 ms
// 访问本机的rou1
sh-4.2# ping -c 1 192.168.1.1
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=0.044 ms

--- 192.168.1.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.044/0.044/0.044/0.000 ms
// 访问vm2的rou2
sh-4.2# ping -c 1 192.168.1.2
PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data.
64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=0.760 ms

--- 192.168.1.2 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.760/0.760/0.760/0.000 ms
// 访问vm2的docker0
sh-4.2# ping -c 1 192.168.2.254
PING 192.168.2.254 (192.168.2.254) 56(84) bytes of data.
64 bytes from 192.168.2.254: icmp_seq=1 ttl=64 time=0.353 ms

--- 192.168.2.254 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.353/0.353/0.353/0.000 ms
// 访问vm2的ns1
sh-4.2# ping -c 1 192.168.2.1
PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data.
64 bytes from 192.168.2.1: icmp_seq=1 ttl=63 time=0.624 ms

--- 192.168.2.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.624/0.624/0.624/0.000 ms
// 访问vm2的ip 需要加入iptables规则
sh-4.2# ping -c 1 172.19.0.8
PING 172.19.0.8 (172.19.0.8) 56(84) bytes of data.

--- 172.19.0.8 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms
2.3.6 adding iptables rules
[root@vm1 ~]# iptables -t nat -A POSTROUTING -s 172.17.1.0/24 -o eth0 -j MASQUERADE
[root@vm1 ~]# 
[root@vm1 ~]# ip netns exec ns1 ping -c 1 172.19.0.8
PING 172.19.0.8 (172.19.0.8) 56(84) bytes of data.
64 bytes from 172.19.0.8: icmp_seq=1 ttl=63 time=0.380 ms

--- 172.19.0.8 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.380/0.380/0.380/0.000 ms
[root@vm1 ~]#

Added to vm2

[root@vm2 ~]# iptables -t nat -A POSTROUTING -s 192.168.2.0/24 -o eth0 -j MASQUERADE
11177530-8b839d5db4b8e9f8.png
Pictures .png

3. References

1. https://blog.csdn.net/wodeamd1/article/details/81282437
2. https://blog.csdn.net/song7999/article/details/80403527
3. Docker cloud container and the container
4. HTTPS: / /blog.csdn.net/qq_27366789/article/details/83348366

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