Differences between revisions 29 and 34 (spanning 5 versions)
⇤ ← Revision 29 as of 2018-01-20 15:30:52 →
Size: 3140
Editor: Kristian Kallenberg
Comment:
← Revision 34 as of 2018-01-20 16:08:25 → ⇥
Size: 3395
Editor: Kristian Kallenberg
Comment:
Deletions are marked like this. Additions are marked like this.
Line 1: Line 1:
Incomplete, do not use!
Line 50: Line 48:
==== 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
}}}
Line 63: Line 68:

THIS HAS TO BE TESTED		 Create heartbeat for haproxy.
Line 66: Line 70:
# create heartbeat for haproxy
Line 68: Line 71:

# make sure the same server has both IP and service
#crm configure group haproxyIPs haproxySharedIP meta ordered=false		 }}}
Make sure the same server has both IP and service at the same time.
{{{
Line 72: Line 75:
# relation between IP and haproxy servers }}}
Create the relation between IP-address and haproxy servers.
{{{
Line 74: Line 79:
# 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
Line 80: Line 80:

IP-address should be up before haproxy starts.
{{{
crm configure order haproxyAfterIPs mandatory: haproxySharedIP haproxyLoadBalance
}}}
Line 102: Line 104:

== Test it ==
{{{
while true; do wget --quiet http://www/ -O /dev/stdout; sleep 1; done
}}}
Line 106: Line 110:
  * https://wiki.debian.org/Debian-HA/ClustersFromScratch  * https://wiki.debian.org/Debian-HA/ClustersFromScratch

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. 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
}

Restart corosync to load the new configuration. 

service corosync restart

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

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 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 at the same time. 

crm configure group haproxy haproxySharedIP haproxyLoadBalance

Create the relation between IP-address and haproxy servers. 

crm configure colocation haproxyWithIPs INFINITY: haproxyLoadBalance haproxySharedIP

IP-address should be up before haproxy starts. 

crm configure order haproxyAfterIPs mandatory: haproxySharedIP haproxyLoadBalance

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

Test it

while true; do wget --quiet http://www/ -O /dev/stdout; sleep 1; done

References

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