Anvil! Tutorial 3

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 Alteeve Wiki :: How To :: Anvil! Tutorial 3

Warning: This tutorial is incomplete, flawed and generally sucks at this time. Do not follow this and expect anything to work. In large part, it's a dumping ground for notes and little else. This warning will be removed when the tutorial is completed.
Warning: This tutorial is built on a guess of what Red Hat's Enterprise Linux 7 will offer, based on what the author sees happening in Fedora upstream. Red Hat never confirms what a future release will contain until it is actually released. As such, this tutorial may turn out to be inappropriate for the final release of RHEL 7. In such a case, the warning above will remain in place until the tutorial is updated to reflect the final release.

This is the third AN!Cluster tutorial built on Red Hat's Enterprise Linux 7. It improves on the RHEL 5, RHCS stable 2 and RHEL 6, RHCS stable3 tutorials.

As with the previous tutorials, the end goal of this tutorial is a 2-node cluster providing a platform for high-availability virtual servers. It's design attempts to remove all single points of failure from the system. Power and networking are made fully redundant in this version, along with minimizing the node failures which would lead to service interruption. This tutorial also covers the AN!Utilities; AN!Cluster Dashboard, AN!Cluster Monitor and AN!Safe Cluster Shutdown.

As it the previous tutorial, KVM will be the hypervisor used for facilitating virtual machines. The old cman and rgmanager tools are replaced in favour of pacemaker for resource management.

Before We Begin

This tutorial does not require prior cluster experience, but it does expect familiarity with Linux and a low-intermediate understanding of networking. Where possible, steps are explained in detail and rationale is provided for why certain decisions are made.

For those with cluster experience;

Please be careful not to skip too much. There are some major and some subtle changes from previous tutorials.

OS Setup

 Warning: I used Fedora 18 at this point, obviously things will change, possibly a lot, once RHEL 7 is released.

Install

yum install net-tools

What Security?

This section will be re-added at the end. For now; 

setenforce 0
sed -i 's/SELINUX=.*/SELINUX=disabled/' /etc/selinux/config
systemctl disable firewalld.service
systemctl stop firewalld.service

Network

We want static, named network devices. Follow this;

Then, use these configuration files;

Build the bridge; 

vim /etc/sysconfig/network-scripts/ifcfg-ifn-vbr1

# Internet-Facing Network - Bridge
DEVICE="ifn-vbr1"
TYPE="Bridge"
BOOTPROTO="none"
IPADDR="10.255.10.1"
NETMASK="255.255.0.0"
GATEWAY="10.255.255.254"
DNS1="8.8.8.8"
DNS2="8.8.4.4"
DEFROUTE="yes"

Now build the bonds; 

vim /etc/sysconfig/network-scripts/ifcfg-ifn-bond1

# Internet-Facing Network - Bond
DEVICE="ifn-bond1"
BRIDGE="ifn-vbr1"
BOOTPROTO="none"
NM_CONTROLLED="no"
ONBOOT="yes"
BONDING_OPTS="mode=1 miimon=100 use_carrier=1 updelay=120000 downdelay=0 primary=ifn1"

vim /etc/sysconfig/network-scripts/ifcfg-sn-bond1

# Storage Network - Bond
DEVICE="sn-bond1"
BOOTPROTO="none"
NM_CONTROLLED="no"
ONBOOT="yes"
BONDING_OPTS="mode=1 miimon=100 use_carrier=1 updelay=120000 downdelay=0 primary=sn1"
IPADDR="10.10.10.1"
NETMASK="255.255.0.0"

vim /etc/sysconfig/network-scripts/ifcfg-bcn-bond1

# Back-Channel Network - Bond
DEVICE="bcn-bond1"
BOOTPROTO="none"
NM_CONTROLLED="no"
ONBOOT="yes"
BONDING_OPTS="mode=1 miimon=100 use_carrier=1 updelay=120000 downdelay=0 primary=bcn1"
IPADDR="10.20.10.1"
NETMASK="255.255.0.0"

Now tell the interfaces to be slaves to their bonds;

Internet-Facing Network; 

vim /etc/sysconfig/network-scripts/ifcfg-ifn1

# Internet-Facing Network - Link 1
DEVICE="ifn1"
NM_CONTROLLED="no"
BOOTPROTO="none"
ONBOOT="yes"
SLAVE="yes"
MASTER="ifn-bond1"

vim /etc/sysconfig/network-scripts/ifcfg-ifn2

# Back-Channel Network - Link 2
DEVICE="ifn2"
NM_CONTROLLED="no"
BOOTPROTO="none"
ONBOOT="yes"
SLAVE="yes"
MASTER="ifn-bond1"

Storage Network; 

vim /etc/sysconfig/network-scripts/ifcfg-sn1

# Storage Network - Link 1
DEVICE="sn1"
NM_CONTROLLED="no"
BOOTPROTO="none"
ONBOOT="yes"
SLAVE="yes"
MASTER="sn-bond1"

vim /etc/sysconfig/network-scripts/ifcfg-sn2

# Storage Network - Link 1
DEVICE="sn2"
NM_CONTROLLED="no"
BOOTPROTO="none"
ONBOOT="yes"
SLAVE="yes"
MASTER="sn-bond1"

Back-Channel Network 

vim /etc/sysconfig/network-scripts/ifcfg-bcn1

# Back-Channel Network - Link 1
DEVICE="bcn1"
NM_CONTROLLED="no"
BOOTPROTO="none"
ONBOOT="yes"
SLAVE="yes"
MASTER="bcn-bond1"

vim /etc/sysconfig/network-scripts/ifcfg-bcn2

# Storage Network - Link 1
DEVICE="bcn2"
NM_CONTROLLED="no"
BOOTPROTO="none"
ONBOOT="yes"
SLAVE="yes"
MASTER="bcn-bond1"

Now restart the network, confirm that the bonds and bridge are up and you are ready to proceed.

Setup The hosts File

You can use DNS if you prefer. For now, lets use /etc/hosts for node name resolution. 

vim /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

# AN!Cluster 01, Node 01
10.255.10.1     an-c01n01.ifn
10.10.10.1      an-c01n01.sn
10.20.10.1      an-c01n01.bcn an-c01n01 an-c01n01.alteeve.ca
10.20.11.1      an-c01n01.ipmi

# AN!Cluster 01, Node 02
10.255.10.2     an-c01n02.ifn
10.10.10.2      an-c01n02.sn
10.20.10.2      an-c01n02.bcn an-c01n02 an-c01n02.alteeve.ca
10.20.11.2      an-c01n02.ipmi

# Foundation Pack
10.20.2.7       an-p03 an-p03.alteeve.ca

Setup SSH

Same as before.

Installing Programs

From this point forward, this tutorial borrows heavily from Pacemaker 1.1, Clusters from Scratch. 

yum install pacemaker corosync pcs

Configure Corosync

More on Multicast.

Pick a Multicast address and ensure that it doesn't conflict with any other multicast group used on your subnet. Pay particular attention to the ambiguous bits and how multicast IPs overlap with one another.

For this tutorial, we will use multicast group 239.255.1.1 and port 5405 

rpm -Uvh http://people.redhat.com/cfeist/pcs/pcs-0.9.26-1.fc18.noarch.rpm


 

Any questions, feedback, advice, complaints or meanderings are welcome.
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