Shulou(Shulou.com)06/01 Report--

Background

Configure the ECS virtual machine with VIP, unable to communicate, why?

HOST A [root@pg11 ~] # ip addr show eth0 2: eth0: mtu 1500 qdisc mq state UP qlen 1000 link/ether 00:16:3e:0a:5c:f1 brd ff:ff:ff:ff:ff:ff inet 172.17.20.29 take 20 brd 172.17.31.255 scope global dynamic eth0 valid_lft 313883835sec preferred_lft 313883835secHOST Bpostgres@pg11- > ip addr show eth0 2: eth0: mtu 1500 qdisc mq state UP qlen 1000 link/ether 00:16 : 3e:12:2f:48 brd ff:ff:ff:ff:ff:ff inet 172.17.20.30 brd 20 brd 172.17.31.255 scope global dynamic eth0 valid_lft 313883847sec preferred_lft 313883847sec on the same VPC (vswitch) Hub)

Can access each other

A ping b ping 172.17.20.29 PING 172.17.20.29 (172.17.20.29) 56 (84) bytes of data. 64 bytes from 172.17.20.29: icmp_seq=1 ttl=64 time=0.156 ms 64 bytes from 172.17.20.29: icmp_seq=2 ttl=64 time=0.102 ms b ping a ping 172.17.20.30 PING 172.17.20.30 (172.17.20.30) 56 (84) bytes of data. 64 bytes from 172.17.20.30: icmp_seq=1 ttl=64 time=0.166 ms 64 bytes from 172.17.20.30: icmp_seq=2 ttl=64 time=0.112 ms

Configure VIP, which cannot be accessed across computers

Host a

[root@pg11 ~] # ip addr add 172.17.20.39 ether 00:16:3e:0a:5c:f1 txqueuelen 20 brd + dev eth0 label eth0:1 [root@pg11] # ifconfig eth0: flags=4163 mtu 1500 inet 172.17.20.29 netmask 255.255.240.0 broadcast 172.17.31.255 ether 00:16:3e:0a:5c:f1 txqueuelen 1000 (Ethernet) RX packets 22221492822 bytes 33552649055304 (30.5 TiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 631860042 bytes 42907936724 (GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 eth0:1: flags=4163 mtu 1500 inet 172.17.20.39 netmask 255.255.240.0 broadcast 172.17.31.255 ether 00:16:3e:0a:5c:f1 txqueuelen 1000 (Ethernet) lo: flags=73 mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 Loop txqueuelen 1 (Local Loopback) RX packets 959417 bytes 111291935 (106.1 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 959417 bytes 111291935 (106.1 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@pg11] # ping 172.17.20.39 PING 172.17.20.39 (172.17.20.39) 56 (84) bytes of data. 64 bytes from 172.17.20.39: icmp_seq=1 ttl=64 time=0.012 ms 64 bytes from 172.17.20.39: icmp_seq=2 ttl=64 time=0.008 ms

Host b

[root@pg11] # ping 172.17.20.39 PING 172.17.20.39 (172.17.20.39) 56 (84) bytes of data.

No firewall

[root@pg11] # iptables-L-v-n Chain INPUT (policy ACCEPT 8 packets, 528 bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 6 packets, 1000 bytes) pkts bytes target prot opt in out source destination cause

The host carries out flow control through openflow, and unregistered vm+ip can be rejected. For details, please refer to the SDN documentation.

Delete VIP

[root@pg11 ~] # ip addr del 172.17.20.39 ether 00:16:3e:0a:5c:f1 txqueuelen 20 brd + dev eth0 label eth0:1 [root@pg11] # ifconfig eth0: flags=4163 mtu 1500 inet 172.17.20.29 netmask 255.255.240.0 broadcast 172.17.31.255 ether 00:16:3e:0a:5c:f1 txqueuelen 1000 (Ethernet) RX packets 22221492889 bytes 33552649060975 (30.5 TiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 631860095 bytes 42907943783 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73 mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 loop txqueuelen 1 (Local Loopback) RX packets 959424 bytes 111292619 (106.1 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 959424 bytes 111292619 (106.1 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 referenc

"examples of using linux IP commands"

A Virtual Switch Platform for Host SDN in the Public Cloud

Https://www.microsoft.com/en-us/research/wp-content/uploads/2017/09/login_fall17_02_firestone.pdf

Https://www.opennetworking.org/

Https://www.cisco.com/c/en/us/about/press/internet-protocol-journal/back-issues/table-contents-59/161-sdn.html

Https://en.wikipedia.org/wiki/OpenFlow

Original address: https://github.com/digoal/blog/blob/master/201810/20181005_01.md

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