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Владимир Ипатов, 12.11.2012 01:58

НАСТРОЙКА¶

НАСТРОЙКА

Перед началом настройки убедитесь, что обе ноды включены и функционируют.

Если Вы планируете использовать второй сетевой адаптер для drbd линка, перед инициализацией кластера Вы должны настроить его.
Войдите на первую ноду по ssh. Из-за недоступности DNS на ноде на данный момент, перед запросом пароля возможна
пауза до минуты.

Настройка сети¶

Схемы настройки сети могут сильно различаться.
Далее мы рассмотрим несколько распространенных примеров.

Простая схема - один ethernet для всего¶

Один интерфейс, одна подсеть, подключение к интернет предоставляется сторонним(не входящим в кластер) сетевым оборудованием.
В данной настройке обе ноды должны быть подключены к гигабитному свитчу.
По умолчанию установщик создает бридж xen-br0. Вы можете изменить параметры, изменяя /etc/network/interfaces.
Изначально он выглядит примерно так:

auto xen-br0
iface xen-br0 inet static
        address 192.168.5.88
        netmask 255.255.255.0
        network 192.168.5.0
        broadcast 192.168.5.255
        gateway 192.168.5.1
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0
#       up ifconfig eth0 mtu 9000
#       up ifconfig xen-br0 mtu 9000

Важные параметры, помимо настроек ipv4:

bridge_ports eth0

Означает, какое сетевое устройство привязано к бриджу.

up ifconfig eth0 mtu 9000
up ifconfig xen-br0 mtu 9000

Настройка jumbo frame на бридже для большей скорости сети и меньшей нагрузки на процессор
Это актуально для интерфейса, на котором будет drbd линк.
Однако, включение jumbo frame приведет к проблемам со связью с любым сетевым оборудованием,
не поддерживающим это. Поэтому данные параметры закомментированы по умолчанию.

Default schema - two ethernets, one for interlink(ganeti interoperation+drbd link) and one for lan.
h3. Схема по умолчанию - 2 ethernet, один для интерлинка(взаимодействия ganeti и drbd линка) и один для локальной сети.¶

Эта схема предпочтительна для большинства ситуаций.
Она не требует наличия гигабитных свитчей, предоставляет неплохую надежность и производительность при низких затратах.
Два гигабитных интерфейса на нодах подключены друг к другу напрямую или через гигабитный свитч(если Вы хотите более чем 2 ноды в кластере).
Остальные интерфейсы подключаются в lan.
В этой схеме сбой в локальной сети не влияет на работоспособность кластера.
Пример конфигурации /etc/network/interfaces для этой схемы.

auto xen-br0
iface xen-br0 inet static
    address 192.168.236.1
    netmask 255.255.255.0
    network 192.168.236.0
    broadcast 192.168.236.255
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0
#    up ifconfig eth0 mtu 9000
#    up ifconfig xen-br0 mtu 9000

auto xen-lan
iface xen-lan inet static
    address 192.168.5.55
    netmask 255.255.255.0
    network 192.168.5.0
    broadcast 192.168.5.255
    gateway 192.168.5.1
    bridge_ports eth1
    bridge_stp off
    bridge_fd 0

Бридж xen-br0 используется для drbd и ganeti обмена, он настроен при установке нод.
Также адрес днс сервера настроен установщиком - это будет адрес нашей сервисной машины(sci).
Бридж xen-lan используется для подключения к локальной сети и должен быть настроен вручную.
В такой конфигурации Вы должны заполнить следующие переменные в sci.conf:
NODE1_IP - Уже настроено установщиком.
NODE1_NAME - Уже настроено установщиком.
NODE2_IP - укажите ip адрес второй ноды на интерлинке(например, 192.168.236.2)
NODE2_NAME - укажите имя второй ноды(напр. gnt2)
NODE1_LAN_IP - ip адрес первой ноды в локальной сети. Он будет доступен в днс под именем $NODE1_NAME-lan.$DOMAIN
NODE2_LAN_IP - ip адрес второй ноды в локальной сети. Он будет доступен в днс под именем $NODE2_NAME-lan.$DOMAIN
CLUSTER_IP - Адрес кластера в локальной сети. НЕ должен совпадать с любым другим существующим адресом. Напр. 192.168.5.35.
CLUSTER_NAME - Имя кластера в локальной сети. Будет доступно в днс под $CLUSTER_NAME.

Много бриджей с маршрутизацией и прямым доступом в интернет.¶

Here is a bit more complicated network setup.
In this setup we have, for example, two private netwokrs and wan by ethernet. All routing and firewalling
performed by separate firewall instance in our cluster. This setup fit when you don't have expensive hardware routers and firewalls.
This is /etc/network/interfaces file in this setup:

auto lan
iface lan inet static
    address 192.168.21.10
    netmask 255.255.255.0
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0

auto server
iface server inet static
    address 192.168.20.10
    netmask 255.255.255.0
    gateway 192.168.20.1
        bridge_ports eth1
        bridge_stp off
        bridge_fd 0
        up ifconfig eth1 mtu 9000
        up ifconfig dmz mtu 9000

auto wan1
iface wan1 inet manual
        bridge_ports eth2
        bridge_stp off
        bridge_fd 0

In this example we have separate lan interfaces, server interface(in this case servers separated from lan and
clients go to servers thru router) and wan interface. server interface - ganeti interoperation dev and drbd link
interfase, so there is mtu 9000.
Also in this example you must edit MASTER_NETDEV and LINK_NETDEV in /etc/sci/sci.conf from default xen-br0 to dmz.
There is no address in wan for hypervisor, although we recommend you to get subnet from
your ISP in order to assign IP addresses to nodes to management it even if router instance
is down.

Here is an example /etc/network/interfaces in router instance:

auto eth0
iface eth0 inet static
   address 192.168.20.1
   netmask 255.255.255.0

auto eth1
iface eth1 inet static
   address 192.168.21.1
   netmask 255.255.255.0

auto eth2
iface eth2 inet static
   address 1.1.1.2
   netmask 255.255.255.0
   address 1.1.1.1

Where eth0 linked to bridge dmz, eth1 linked to lan, eth2 linked to wan.

Datacenter schema - separate interfaces for lan, ganeti interoperation, drbd link.¶

If you have powerful networking infrastructure
Here we have separate interfaces for ganeti interoperation(in this case it may be named management interface)

auto mgmt
iface mgmt inet static
    address 192.168.236.1
    netmask 255.255.255.0
    network 192.168.236.0
    gateway 192.168.236.1
    broadcast 192.168.236.255
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0

auto xen-san
iface xen-san inet static
    address 192.168.237.1
    netmask 255.255.255.0
    network 192.168.237.0
    broadcast 192.168.237.255
    bridge_ports eth1
    bridge_stp off
    bridge_fd 0
    up ifconfig eth1 mtu 9000
    up ifconfig xen-san mtu 9000

auto xen-lan
iface xen-lan inet manual
    bridge_ports eth2
    bridge_stp off
    bridge_fd 0

In this example nodes don't have addresses in lan.
You must fill these vars in sci.conf to create cluster fits this network config:
NODE1_IP - already configured by installer.
NODE1_NAME - already configured by installer.
NODE2_IP - set interlink ip address of second node. e.g. 192.168.236.2
NODE2_NAME - set second node name. e.g. gnt2
NODE1_SAN_IP - lan ip for first node. It will be available by dns name $NODE1_NAME-san. 192.168.237.1
NODE2_SAN_IP - lan ip for first node. It will be available by dns name $NODE1_NAME-san. e.g. 192.168.237.2
CLUSTER_IP - cluster address in lan. Must not match any exist host address in lan. 192.168.236.35
CLUSTER_NAME - cluster name in lan. In will be available by dns name $CLUSTER_NAME.
SCI_LAN_IP - if you want presence sci intance in your lan, assign ip. e.g. 192.168.35.5
SCI_LAN_NETMASK - your nodes don't have addresses in lan, so you must enter netmask for this segment by hand. e.g. 255.255.255.0
SCI_LAN_GATEWAY - your nodes don't have addresses in lan, so you must enter gateway for this segment by hand. e.g. 192.168.35.1
Of course, it is easy to use VLANS in datacenter conditions. Next example will explain how. However, remember it is recommended
that drbd link must be on separate ethernet.

VLAN schema¶

If you have managed switches, you can set networking with VLANs.
You should add something like this for each VLAN:

auto eth0.55
iface eth0.55 inet manual
        up ifconfig eth0.55 up

auto bridge-example-vlan
iface bridge-example-vlan inet manual
        up brctl addbr bridge-example-vlan
        up brctl addif bridge-example-vlan eth0.55
        up brctl stp bridge-example-vlan off
        up ifconfig bridge-example-vlan up
        down ifconfig bridge-example-vlan down
        down brctl delbr bridge-example-vlan

Where 55 - VLAN number.
In this example node don't have an ip address in this VLAN, although you could
assign an ip to bridge just like standard bridge.

Alternative schema is:

auto vlan55
iface vlan55 inet manual
   vlan_raw_device eth0

auto bridge-example-vlan
iface bridge-example-vlan inet manual
           bridge_ports vlan55
        bridge_stp off
        bridge_fd 0

It do the same, but in another way.

DEFINING ENVIRONMENT¶

Edit /etc/sci/sci.conf

Most of values rely of your network setup. In section network setup it was described for most cases.

Here is additional notes about sci.conf configuring:

You should specify node1 and node2 data as you have installed them.
NOTE: You can setup the cluster even with one node. In this case just leave NODE2_
lines as is. In fact this is a dangerous setup, so you will be warned about this duging
the procedures.

You should specify the cluster's name and IP.

NODE#_SAN_IP should be specified on both nodes or none.

NODE#_LAN_IP should be specified on both nodes or none.

If you haven't Internet uplink or have a local package mirrors, you should correct
APT_ - settings.

If you need to uplink to the DNS hierarchy other than root hint zones, specify DNS_FORWARDERS
(note trailing ';').

MASTER_NETDEV - master interface name for cluster address. Auto-detected by default.

LAN_NETDEV - Network interface to bind to virtual machies by default. Auto-detected by default.

RESERVED_VOLS - list of volumes ignored by ganeti. Comma separated. You must specify vg for all volumes in this list.

SETUP CLUSTER¶

Issue:

# sci-setup cluster

Check and confirm settings printed.

The process will go on.

Next you will be prompted to accept ssh key from node2 and for the root's password to node2.

On finish you will look something like this:

Verify
Wed Jan 12 15:36:10 2011 * Verifying global settings
Wed Jan 12 15:36:10 2011 * Gathering data (1 nodes)
Wed Jan 12 15:36:11 2011 * Verifying node status
Wed Jan 12 15:36:11 2011 * Verifying instance status
Wed Jan 12 15:36:11 2011 * Verifying orphan volumes
Wed Jan 12 15:36:11 2011 * Verifying orphan instances
Wed Jan 12 15:36:11 2011 * Verifying N+1 Memory redundancy
Wed Jan 12 15:36:11 2011 * Other Notes
Wed Jan 12 15:36:11 2011 * Hooks Results
Node                    DTotal  DFree MTotal MNode MFree Pinst Sinst
gnt1.ganeti.example.org 100.0G 100.0G  1020M  379M  625M     0     0
gnt2.ganeti.example.org 100.0G 100.0G  1020M  379M  625M     0     0
If all is ok, proceed with /usr/local/sbin/sci-setup service

SETUP SERVICE INSTANCE¶

The service instance is named 'sci' and have a few aliases.
On setup, it's IP address is determined from /etc/resolv.conf of your first node.
This instance will be hardcoded in /etc/hosts file of all cluster nodes and instances.

Issue:

# sci-setup service

You'll see the progress of DRBD syncing disks, then the message

* running the instance OS create scripts...

appears. The further may take a while. The process finishes with

* starting instance...

message.

Now you can log on to the sci instance using:

# gnt-instance console sci

Log in as root, the password is empty.
NOTE: Due to empty password all remote connections to new instance is prohibited.
You should change password and install openssh-server package manually after
successful bootstrap procedure.

SERVICE INSTANCE BOOTSTRAP¶

The system will setup itself via puppet. This is the iterative process. You can monitor
it by looking into /var/log/daemon.log. At start there is no less command yet, so
you can use more, cat, tail or tail -f until less will be auto-installed.

By default the iterations are repeated in 20 minutes. To shorten the wait time you can
issue

# /etc/init.d/puppet restart

and then look into daemon.log how it finishes.

Repeat this a few times until puppet will do nothing in turn.

PREPARING FOR NEW INSTANCES¶

New instances are created just by regular Ganeti commands such as:

gnt-instance add -t drbd -o debootstrap+default -s 10g -B memory=256m -n NODE1_NAME:NODE2_NAME INSTANCE_NAME

Altought, some tuning hooks are provided by SCI-CD project:

Each instance has installed puppet for autoconfiguration and openssh-client for file transfers etc.
The instance uses pygrub to boot kernel from /vmlinuz & Co on the innstance's own disk.
The instance's network interfaces may be set up automatically as described below.

INSTANCE INTERFACE AUTOCONFIGURATION¶

If your instances may sit on several networks and you need static addressing in them, you should fulfill
the file /etc/ganeti/networks with all known networks you want to attach your instances.
Each line in the file has format

NETWORK

NETMASK

BROADCAST

GATEWAY

Ganeti instance debootstrap hook looks in this file for the network, mathing the address of bootstraped
instance and fulfill it's /etc/network/interfaces accordingly.

NOTE: If you have only one default network, you shouldn't care because it's data are preinstalled.
NOTE: networks file must be copied to all cluster nodes (not automated yet).

SCI OPERATIONS¶

Read OPERATIONS next.

Проект

Общее

Профиль

SCI-CD

Wiki

НАСТРОЙКА » История » Версия 2

НАСТРОЙКА¶

Настройка сети¶

Простая схема - один ethernet для всего¶

Default schema - two ethernets, one for interlink(ganeti interoperation+drbd link) and one for lan.
h3. Схема по умолчанию - 2 ethernet, один для интерлинка(взаимодействия ganeti и drbd линка) и один для локальной сети.¶

Много бриджей с маршрутизацией и прямым доступом в интернет.¶

Datacenter schema - separate interfaces for lan, ganeti interoperation, drbd link.¶

VLAN schema¶

DEFINING ENVIRONMENT¶

SETUP CLUSTER¶

SETUP SERVICE INSTANCE¶

SERVICE INSTANCE BOOTSTRAP¶

PREPARING FOR NEW INSTANCES¶

INSTANCE INTERFACE AUTOCONFIGURATION¶

SCI OPERATIONS¶

Проект

Общее

Профиль

SCI-CD

Wiki

НАСТРОЙКА » История » Версия 2

НАСТРОЙКА¶

Настройка сети¶

Простая схема - один ethernet для всего¶

Default schema - two ethernets, one for interlink(ganeti interoperation+drbd link) and one for lan.h3. Схема по умолчанию - 2 ethernet, один для интерлинка(взаимодействия ganeti и drbd линка) и один для локальной сети.¶

Много бриджей с маршрутизацией и прямым доступом в интернет.¶

Datacenter schema - separate interfaces for lan, ganeti interoperation, drbd link.¶

VLAN schema¶

DEFINING ENVIRONMENT¶

SETUP CLUSTER¶

SETUP SERVICE INSTANCE¶

SERVICE INSTANCE BOOTSTRAP¶

PREPARING FOR NEW INSTANCES¶

INSTANCE INTERFACE AUTOCONFIGURATION¶

SCI OPERATIONS¶

Default schema - two ethernets, one for interlink(ganeti interoperation+drbd link) and one for lan.
h3. Схема по умолчанию - 2 ethernet, один для интерлинка(взаимодействия ganeti и drbd линка) и один для локальной сети.¶