lost and found ( for me ? ): dhcp

Reference

https://www.rdoproject.org/troubleshooting/networking/

https://www.rdoproject.org/networking/networking-in-too-much-detail/

There are three nodes running, controller, network and compute node in my environment.

the internet

vm1 vm2 |

compute network node controller node

|------------------------|-------------------------------------|

user01 has a router “my-router”.

+--------------------------------------+-----------+----------------------------------------------------------------------+

(neutron) [root@controller ~(keystone_user01)]# neutron router-list

+--------------------------------------+-----------+----------------------------------------------------------------------+

| id | name | external_gateway_info |

+--------------------------------------+-----------+----------------------------------------------------------------------+

| 3be9346b-9447-46d4-8222-f507be59357e | my-router | {"network_id": "b586f891-9821-4b0b-8d0e-b224b164383c", |

| | | "enable_snat": true, "external_fixed_ips": [{"subnet_id": "96a2cf60 |

| | | -346d-4ad7-8975-89a4c8f19bb0", "ip_address": "192.168.131.131"}]} |

+--------------------------------------+-----------+----------------------------------------------------------------------+

[root@controller ~(keystone_user01)]#

on the network node, list network namespace.

[root@network ~]# ip netns list

qdhcp-b586f891-9821-4b0b-8d0e-b224b164383c

qdhcp-7745f545-4d41-4f0d-9653-899a1526af8c

qrouter-3be9346b-9447-46d4-8222-f507be59357e

qdhcp-ecc3c3f9-31bd-4998-a41d-b682b508bfb5

qdhcp-d586146c-d5cb-42d5-b2f6-c0a78a7e8f82

qrouter-cf414122-2ed7-446c-88a6-448876d8196b

qrouter- : router’s namespace

qdhcp- : dhcp namespace

[ router namespace ]

my-router has two interfaces.

qr-ec8a8119-49 is for internal network

qg-05a86ecc-dd is for external network

[root@network ~]# ip netns exec qrouter-3be9346b-9447-46d4-8222-f507be59357e ip -4 a s

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN

inet 127.0.0.1/8 scope host lo

valid_lft forever preferred_lft forever

12: qr-ec8a8119-49: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN

inet 192.168.37.1/24 brd 192.168.37.255 scope global qr-ec8a8119-49

valid_lft forever preferred_lft forever

19: qg-05a86ecc-dd: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN

inet 192.168.131.131/24 brd 192.168.131.255 scope global qg-05a86ecc-dd

valid_lft forever preferred_lft forever

inet 192.168.131.132/32 brd 192.168.131.132 scope global qg-05a86ecc-dd

valid_lft forever preferred_lft forever

inet 192.168.131.133/32 brd 192.168.131.133 scope global qg-05a86ecc-dd

valid_lft forever preferred_lft forever

Access to the instance from this router.

Two instances are running.

[root@controller ~(keystone_user01)]# nova list

+--------------------------------------+-------------------+--------+------------+-------------+----------------------------------------+

+--------------------------------------+-------------------+--------+------------+-------------+----------------------------------------+

+--------------------------------------+-------------------+--------+------------+-------------+----------------------------------------+

[root@controller ~(keystone_user01)]#

Access to the instance over SSH from qrouter.

[root@network ~]# ip netns exec qrouter-3be9346b-9447-46d4-8222-f507be59357e ssh cirros@192.168.37.3

cirros@192.168.37.3's password:

$ hostname

my-first-instance

$ exit

Connection to 192.168.37.3 closed.

[root@network ~]#

[ DHCP namespace ]

[root@controller ~(keystone_user01)]# neutron net-list

+--------------------------------------+----------+-------------------------------------------------------+

| id | name | subnets |

+--------------------------------------+----------+-------------------------------------------------------+

| b586f891-9821-4b0b-8d0e-b224b164383c | ext | 96a2cf60-346d-4ad7-8975-89a4c8f19bb0 192.168.131.0/24 |

| f6d28e0c-0233-416e-a212-b1d36d4d3cbf | public | 22f91b90-5c43-474e-8e01-b72ac359186e |

| ecc3c3f9-31bd-4998-a41d-b682b508bfb5 | internal | 37b936a4-cd4c-4565-9dee-2961cfc592c7 192.168.37.0/24 |

+--------------------------------------+----------+-------------------------------------------------------+

[root@controller ~(keystone_user01)]#

DHCP namespace for internal network.

[root@network ~]# ip netns exec qdhcp-ecc3c3f9-31bd-4998-a41d-b682b508bfb5 ip -4 a s

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN

inet 127.0.0.1/8 scope host lo

valid_lft forever preferred_lft forever

11: tap58c34b1f-66: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN

inet 192.168.37.2/24 brd 192.168.37.255 scope global tap58c34b1f-66

valid_lft forever preferred_lft forever

[root@network ~]#

[root@network ~]# ip netns exec qdhcp-ecc3c3f9-31bd-4998-a41d-b682b508bfb5 ip -4 r s

default via 192.168.37.1 dev tap58c34b1f-66

192.168.37.0/24 dev tap58c34b1f-66 proto kernel scope link src 192.168.37.2

[root@network ~]#

DHCP namespace for external network.

[root@network ~]# ip netns exec qdhcp-b586f891-9821-4b0b-8d0e-b224b164383c ip -4 a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN

inet 127.0.0.1/8 scope host lo

valid_lft forever preferred_lft forever

18: tap89b14979-b3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN

inet 192.168.131.130/24 brd 192.168.131.255 scope global tap89b14979-b3

valid_lft forever preferred_lft forever

[root@network ~]# ip netns exec qdhcp-b586f891-9821-4b0b-8d0e-b224b164383c ip -4 r s

default via 192.168.131.1 dev tap89b14979-b3

192.168.131.0/24 dev tap89b14979-b3 proto kernel scope link src 192.168.131.130

[root@network ~]#

Here is a dnsmasq process for external network.

[root@network ~]# ps aux | grep dnsmasq | grep ap89b14979-b3 | grep -v grep

nobody 22575 0.0 0.0 15556 872 ? S 9月14 0:00 dnsmasq --no-hosts --no-resolv --strict-order --except-interface=lo --pid-file=/var/lib/neutron/dhcp/b586f891-9821-4b0b-8d0e-b224b164383c/pid --dhcp-hostsfile=/var/lib/neutron/dhcp/b586f891-9821-4b0b-8d0e-b224b164383c/host --addn-hosts=/var/lib/neutron/dhcp/b586f891-9821-4b0b-8d0e-b224b164383c/addn_hosts --dhcp-optsfile=/var/lib/neutron/dhcp/b586f891-9821-4b0b-8d0e-b224b164383c/opts --dhcp-leasefile=/var/lib/neutron/dhcp/b586f891-9821-4b0b-8d0e-b224b164383c/leases --dhcp-match=set:ipxe,175 --bind-interfaces --interface=tap89b14979-b3 --dhcp-range=set:tag0,192.168.131.0,static,86400s --dhcp-option-force=option:mtu,1450 --dhcp-lease-max=256 --conf-file=/etc/neutron/dnsmasq-neutron.conf --domain=openstacklocal

[root@network ~]#

this is for internal network.

[root@network ~]# ps aux | grep dnsmasq | grep tap58c34b1f-66 | grep -v grep

nobody 22585 0.0 0.0 15556 956 ? S 9月14 0:00 dnsmasq --no-hosts --no-resolv --strict-order --except-interface=lo --pid-file=/var/lib/neutron/dhcp/ecc3c3f9-31bd-4998-a41d-b682b508bfb5/pid --dhcp-hostsfile=/var/lib/neutron/dhcp/ecc3c3f9-31bd-4998-a41d-b682b508bfb5/host --addn-hosts=/var/lib/neutron/dhcp/ecc3c3f9-31bd-4998-a41d-b682b508bfb5/addn_hosts --dhcp-optsfile=/var/lib/neutron/dhcp/ecc3c3f9-31bd-4998-a41d-b682b508bfb5/opts --dhcp-leasefile=/var/lib/neutron/dhcp/ecc3c3f9-31bd-4998-a41d-b682b508bfb5/leases --dhcp-match=set:ipxe,175 --bind-interfaces --interface=tap58c34b1f-66 --dhcp-range=set:tag0,192.168.37.0,static,86400s --dhcp-option-force=option:mtu,1450 --dhcp-lease-max=256 --conf-file=/etc/neutron/dnsmasq-neutron.conf --domain=openstacklocal

[root@network ~]#

dhcperf なんてのがあるんだー。

Nominum社ってところが、フリーで配布している。

dhcperf 、なんて発音するんだ。でぃーえいちしーぱーふ、でいいのかな??

http://www.nominum.com/services/measurement_tools.php

Fedoraのソースはない。RHEL 4 のダウンロード。

[root@arizona src]# tar xzvf dhcperf-1.0.1.0-1-rhel-4-i386.tar.gz
[root@arizona src]# cd dhcperf-1.0.1.0-1

RPMなんだー。

[root@arizona dhcperf-1.0.1.0-1]# rpm -ivh dhcperf-1.0.1.0-1.i386.rpm

んで、バイナリ(dhcperf)は下記のディレクトリにインストールされる。

/usr/local/nom/bin/dhcperf

マニュアルや、測定方法のPDFもある。あとでじっくり(さらっと?)、見てみよう。

/usr/local/nom/doc/dhcperf/dcsevaltutorial.pdf
/usr/local/nom/doc/dhcperf/dhcperf.pdf

man マニュアルのあるので、MANPATH を設定しよう。。

/usr/local/nom/man/man1/dhcperf.1

# vi /etc/man.config
MANPATH /usr/local/nom/man　<-これ追加

MANPATH追加すれば、man dhcperf で使い方が確認できる。

[root@arizona ~]# man dhcperf
NAME
dhcperf - DHCP Performance Test Tool

SYNOPSIS
dhcperf [ --client-creation-load transactions/second
] [ --clients clients ] [ --discover ] [ -h, --help ] [ --one-dis-
cover ] [ -p, --port port ] [ --progress ] [ -q, --quiet ] [
--remoteid-base remoteid ] [ --remoteid-groupsize clients ] [
--remoteid-string string ] [ --renew ] [ --retain-leases ] [ -s,
--server server ] [ --test-duration seconds ] [ --test-load transac-
tions/second
] [ --usage ]

DESCRIPTION
dhcperf is a utility for testing the performance of DHCP servers.

2種類のテストができるみたい。discover と renew のテスト。なるほど、なるほど。

TESTS
dhcperf provides two main test modes: The DHCPDISCOVER test analyzes
performance of four-way handshakes, and the DHCPRENEW that of address
renewals. In addition, the one-discover mode performs a single four-way
handshake, as a quick means of testing server availability.

Select a test mode using the --discover, --renew, and --one-discover
options. Exactly one test must be selected.

では、試しにトライ。

dhcperf ( hostname arizona, 192.168.1.150 ) --- ISC-DHCPD ( hostname alaska, 192.168.1.200 )

[root@arizona ~]# /usr/local/nom/bin/dhcperf --server 192.168.1.200 --one-discover
Could not bind to port 67: Address already in use

ん、だれか67番ポートつかんでるぞ。。。

あっ、dnsmasq だ。
KVM用の簡易DNS,DHCPデーモン。VMにIPのリース、名前解決を提供するデーモン。

[root@arizona ~]# lsof -i:67
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
dnsmasq 1750 nobody 5u IPv4 7287 0t0 UDP *:bootps

ストップ!!

[root@arizona ~]# service dnsmasq stop
Shutting down dnsmasq: [ OK ]

try again !

--progress をオプションに書くと、毎秒テストの進捗が表示されるみたいだ。

--progress
Print test progress information every second.

お、負荷かけてますねー。

[root@arizona ~]# /usr/local/nom/bin/dhcperf --server 192.168.1.200 --discover --progress
Beginning DHCPDISCOVER load test.
secs success failure active | minimum current maximum
0 0 0 0 | 0 1 1
1 0 0 0 | 0 1 1
2 0 0 1 | 0 1 1
3 1 0 1 | 0 1 1
4 1 0 2 | 0 2 2
5 2 0 2 | 0 2 2

[root@alaska dhcp]# tail /var/log/messages
alaska dhcpd: DHCPRELEASE of 192.168.1.77 from 00:00:00:00:01:09 via 192.168.1.150 (found)
alaska dhcpd: DHCPDISCOVER from 00:00:00:00:01:17 via 192.168.1.150
alaska dhcpd: DHCPOFFER on 192.168.1.56 to 00:00:00:00:01:17 via 192.168.1.150
alaska dhcpd: DHCPRELEASE of 192.168.1.22 from 00:00:00:00:01:0a via 192.168.1.150 (found)
alaska dhcpd: DHCPDISCOVER from 00:00:00:00:01:18 via 192.168.1.150
alaska dhcpd: DHCPOFFER on 192.168.1.55 to 00:00:00:00:01:18 via 192.168.1.150

よさげなツール。

gid ( gateway address ) とかは指定できないのかなー。
指定できないみたい。

AGENT OPTIONS
dhcperf may be configured to send a DHCP Relay Agent Information option
(option 82) in every DHCP packet, containing a configurable Agent
Remote ID suboption. It is not possible to send an Agent Circuit ID
suboption at this time.

- config

[root@alaska dhcp]# dhcpd -v
Internet Systems Consortium DHCP Server 4.1.0p1

[root@alaska dhcp]# egrep -v "^#" dhcpd.conf
subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.10 192.168.1.100;
option routers 192.168.1.254;
option broadcast-address 192.168.1.255;
default-lease-time 600;
max-lease-time 7200;
}
[root@alaska dhcp]#

stevie salas の back from the livin' 名作だなー。
groove 感さいこー。サラス、カッティング上手いなー。
bass は TM Stevens だし、drums は Brian Tichy だし。

from one hundred stories high .. out the window i did fly..
never tough anyone .never change anything .. but i once was there..i did fly ..

i once was there いい曲だー、歌詞も好き。ほぼ全曲好きだ～。
レニクラ人気でるなら、サラスも人気出てもいいのに。。レニクラも大好きだけど。。。
salas ,,, 逆にしても salas

lost and found ( for me ? )

lost and found ( for me ? )

OpenStack logs ( network namespace )

dhcperf: DHCPパフォーマンス測定ツール