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⇤ ← Revision 1 as of 2018-01-08 13:01:27 →
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Editor: Kristian Kallenberg
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Editor: Kristian Kallenberg
Comment:
Deletions are marked like this. Additions are marked like this.
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= Corosync = Incomplete, do not use!
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We will use corosync to create a virtual IP which is share by two systems = Corosync and HA-proxy =
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This has to be configured before haproxy configuration makes any sense, since haproxy should listen on the virtual ip. also we need to configure the dns name for the virtual ip first. so this depends on dns updates too. We will use corosync to create a virtual IP-address which is shared by two systems. One of the systems has the virtual IP-address. If the system goes down, the other system will take over the virtual IP-address. HA-proxy will be running on each of the hosts relaying incoming HTTP-requests to two webservers.

 * 192.168.1.47 www (virtual IP-address)
 * 192.168.1.48 haproxy01
 * 192.168.1.49 haproxy02

== Software ==
{{{
apt-get install corosync haproxy crmsh
}}}

== Configuration ==
Before binding to the DNS name `www` make sure the DNS server knows that name. There is no physical or virtual network interfaces, so the [[DNS Updates|DNS updates]] has to be done manually.

=== Corosync ===

==== Encryption ====
Edit `/etc/corosync/corosync.conf` and make the following changes.
{{{
totem {
        crypto_cipher: aes256
        crypto_hash: sha512
}
}}}

==== Certificates ====
Generate the certificates. Note that this requires entropy, so use your system and the entropy will be generated.
{{{
corosync-keygen
}}}

==== Network ====
Add the local network and a multicast address to `/etc/corosync/corosync.conf` in the `interface` section.
{{{
interface {
        bindnetaddr: 192.168.1.0
        mcastaddr: 239.192.1.1
}
}}}

==== Only Two Nodes ====
Add this to the quorum block of `/etc/corosync/corosync.conf`.
{{{
quorum {
        two_node: 1
}
}}}

Restart corosync to load the new configuration.
{{{
service corosync restart
}}}

== Commmands ==
Run the following on startup
{{{#!highlight bash
# do not kill other node
crm configure property stonith-enabled=false
# disable quorum due to two nodes only
crm configure property no-quorum-policy=ignore
# configure shared IP
crm configure primitive haproxySharedIP ocf:heartbeat:IPaddr2 params ip=192.168.1.47 cidr_netmask=24 op monitor interval=5s
# create heartbeat for haproxy
crm configure primitive haproxyLoadBalance ocf:heartbeat:haproxy params conffile=/etc/haproxy/haproxy.cfg op monitor interval=10s

# make sure the same server has both IP and service
#crm configure group haproxyIPs haproxySharedIP meta ordered=false
crm configure group haproxy haproxySharedIP haproxyLoadBalance
# relation between IP and haproxy servers
crm configure colocation haproxyWithIPs INFINITY: haproxyLoadBalance haproxySharedIP
# IP should be up before haproxy starts
crm configure order haproxyAfterIPs mandatory: haproxySharedIP haproxyLoadBalance
#wget http://github.com/russki/cluster-agents/raw/master/haproxy
#echo "net.ipv4.ip_nonlocal_bind = 1" >> /etc/sysctl.conf

}}}



=== HA-proxy ===
Add the following to `/etc/haproxy/haproxy.cfg`
{{{
listen webfarm
        bind www:80
        mode http
        balance roundrobin
        cookie LBN insert indirect nocache
        option httpclose
        option forwardfor
        server haproxy01 www01:80 cookie node1 check
        server haproxy02 www02:80 cookie node2 check
}}}

Restart HA-proxy
{{{
service haproxy restart
}}}




== References ==
  * https://wiki.debian.org/Debian-HA/ClustersFromScratch

Incomplete, do not use!

Corosync and HA-proxy

We will use corosync to create a virtual IP-address which is shared by two systems. One of the systems has the virtual IP-address. If the system goes down, the other system will take over the virtual IP-address. HA-proxy will be running on each of the hosts relaying incoming HTTP-requests to two webservers.

  • 192.168.1.47 www (virtual IP-address)
  • 192.168.1.48 haproxy01
  • 192.168.1.49 haproxy02

Software

apt-get install corosync haproxy crmsh

Configuration

Before binding to the DNS name www make sure the DNS server knows that name. There is no physical or virtual network interfaces, so the DNS updates has to be done manually.

Corosync

Encryption

Edit /etc/corosync/corosync.conf and make the following changes. 

totem {
        crypto_cipher: aes256
        crypto_hash: sha512
}

Certificates

Generate the certificates. Note that this requires entropy, so use your system and the entropy will be generated. 

corosync-keygen

Network

Add the local network and a multicast address to /etc/corosync/corosync.conf in the interface section. 

interface {
        bindnetaddr: 192.168.1.0 
        mcastaddr: 239.192.1.1
}

Only Two Nodes

Add this to the quorum block of /etc/corosync/corosync.conf. 

quorum {
        two_node: 1
}

Restart corosync to load the new configuration. 

service corosync restart

Commmands

Run the following on startup 

   1 # do not kill other node
   2 crm configure property stonith-enabled=false
   3 # disable quorum due to two nodes only
   4 crm configure property no-quorum-policy=ignore
   5 # configure shared IP
   6 crm configure primitive haproxySharedIP  ocf:heartbeat:IPaddr2 params ip=192.168.1.47 cidr_netmask=24 op monitor interval=5s
   7 # create heartbeat for haproxy
   8 crm configure primitive haproxyLoadBalance ocf:heartbeat:haproxy params conffile=/etc/haproxy/haproxy.cfg op monitor interval=10s
   9 
  10 # make sure the same server has both IP and service
  11 #crm configure group haproxyIPs haproxySharedIP meta ordered=false
  12 crm configure group haproxy haproxySharedIP haproxyLoadBalance
  13 # relation between IP and haproxy servers
  14 crm configure colocation haproxyWithIPs INFINITY: haproxyLoadBalance haproxySharedIP
  15 # IP should be up before haproxy starts
  16 crm configure order haproxyAfterIPs mandatory: haproxySharedIP haproxyLoadBalance 
  17 #wget http://github.com/russki/cluster-agents/raw/master/haproxy
  18 #echo "net.ipv4.ip_nonlocal_bind = 1" >> /etc/sysctl.conf
  19

HA-proxy

Add the following to /etc/haproxy/haproxy.cfg 

listen webfarm 
        bind www:80
        mode http
        balance roundrobin
        cookie LBN insert indirect nocache
        option httpclose
        option forwardfor
        server haproxy01 www01:80 cookie node1 check
        server haproxy02 www02:80 cookie node2 check

Restart HA-proxy 

service haproxy restart

References

None: Corosync and HA-proxy (last edited 2021-08-12 09:31:08 by Kristian Kallenberg)