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| Deletions are marked like this. | Additions are marked like this. |
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| ==== Certificates ==== Generate the certificates. Note that this requires entropy, so use your system and the entropy will be generated. Speed this up by running `dd if=/dev/vda of=/dev/null` in another terminal. |
==== Authentication ==== Generate the authkey. Note that this requires entropy, so use your system and the entropy will be generated. Speed this up by running `dd if=/dev/vda of=/dev/null` in another terminal. |
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| Copy the configuration `/etc/corosync/corosync.conf` and the authkey `/etc/corosync/authkey` to the other host. | |
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| Restart corosync to load the new configuration. | Restart corosync on both hosts to load the new configuration. |
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=== HA-proxy === |
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| }}} This has to be done on both hosts. 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 }}} Copy the configuration `/etc/haproxy/haproxy.cfg` to the other host. Restart HA-proxy on both hosts to load the new configuration. {{{ service haproxy restart |
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currently gives: root@haproxy01:/etc/corosync# crm configure colocation haproxyWithIPs INFINITY: haproxy_wwwLoadBalance haproxy_wwwSharedIP WARNING: haproxyWithIPs: resource haproxy_wwwLoadBalance is grouped, constraints should apply to the group WARNING: haproxyWithIPs: resource haproxy_wwwSharedIP is grouped, constraints should apply to the group) |
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| crm configure colocation haproxyWithIPs INFINITY: haproxyLoadBalance haproxySharedIP | crm configure colocation haproxyWithIPs INFINITY: haproxy_wwwLoadBalance haproxy_wwwSharedIP |
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| }}} === 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 |
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.
- 192.168.1.49 www (virtual IP-address)
- 192.168.1.50 haproxy01
- 192.168.1.51 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
}
Authentication
Generate the authkey. Note that this requires entropy, so use your system and the entropy will be generated. Speed this up by running dd if=/dev/vda of=/dev/null in another terminal.
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
}Copy the configuration /etc/corosync/corosync.conf and the authkey /etc/corosync/authkey to the other host.
Restart corosync on both hosts to load the new configuration.
service corosync restart
HA-proxy
HA-proxy resource script
Download the HA-proxy resource script, place it in /usr/lib/ocf/resource.d/heartbeat/haproxy and make it executeable.
wget https://raw.githubusercontent.com/thisismitch/cluster-agents/master/haproxy -O /usr/lib/ocf/resource.d/heartbeat/haproxy chmod +x /usr/lib/ocf/resource.d/heartbeat/haproxy
This has to be done on both hosts.
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 checkCopy the configuration /etc/haproxy/haproxy.cfg to the other host.
Restart HA-proxy on both hosts to load the new configuration.
service haproxy restart
Nodes
Do not kill the 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-address.
crm configure primitive haproxy_wwwSharedIP ocf:heartbeat:IPaddr2 params ip=192.168.1.49 cidr_netmask=24 op monitor interval=5s
Create heartbeat for haproxy.
crm configure primitive haproxy_wwwLoadBalance ocf:heartbeat:haproxy params conffile=/etc/haproxy/haproxy.cfg op monitor interval=10s
Make sure the same server has both IP and service at the same time.
crm configure group haproxy_www haproxy_wwwSharedIP haproxy_wwwLoadBalance
Create the relation between IP-address and haproxy servers.
currently gives: root@haproxy01:/etc/corosync# crm configure colocation haproxyWithIPs INFINITY: haproxy_wwwLoadBalance haproxy_wwwSharedIP
WARNING: haproxyWithIPs: resource haproxy_wwwLoadBalance is grouped, constraints should apply to the group
WARNING: haproxyWithIPs: resource haproxy_wwwSharedIP is grouped, constraints should apply to the group)
crm configure colocation haproxyWithIPs INFINITY: haproxy_wwwLoadBalance haproxy_wwwSharedIP
IP-address should be up before haproxy starts.
crm configure order haproxyAfterIPs mandatory: haproxy_wwwSharedIP haproxy_wwwLoadBalance
Test it
while true; do wget --quiet http://www/ -O /dev/stdout; sleep 1; done