Corosync-ubuntu

Zwei Nodes

• twix
• raider

install corosync und pacemaker

• root@twix:~# apt-get install -y pacemaker corosync
• root@raider:~# apt-get install -y pacemaker corosync

key exchange

• root@twix:~# ssh-keygen
• root@twix:~# ssh-copy-id raider

• root@raider:~# ssh-keygen
• root@raider:~# ssh-copy-id twix

script for lazy people

• root@twix:/etc/drbd.d# cat /usr/local/sbin/sync-us

#!/bin/bash
OTHER=raider
rsync -avzx $* $OTHER:$PWD/

• root@raider:/etc/drbd.d# cat /usr/local/sbin/sync-us

#!/bin/bash
OTHER=twix
rsync -avzx $* $OTHER:$PWD/

corosync set

• root@twix:~# sed -i "s/bindnetaddr: 127.0.0.1/bindnetaddr: 10.0.0.0/g" /etc/corosync/corosync.conf
• root@twix:~# sed -i "s/START=no/START=yes/" /etc/default/corosync

syncronisize

• root@twix:~# rsync -avz /etc/corosync/corosync.conf raider:/etc/corosync/corosync.conf
• root@twix:~# rsync -avz /etc/default/corosync raider:/etc/default/corosync

autostart pacemaker

• root@twix:~# update-rc.d pacemaker defaults
• root@raider:~# update-rc.d pacemaker defaults

start systems

• root@twix:~# service corosync start
• root@twix:~# service pacemaker start

• root@raider:~# service corosync start
• root@raider:~# service pacemaker start

first check

• root@twix:~# crm configure show

node $id="167772162" raider
node $id="167772163" twix
property $id="cib-bootstrap-options" \
	dc-version="1.1.10-42f2063" \
	cluster-infrastructure="corosync"

• root@raider:~# crm configure show

node $id="167772162" raider
node $id="167772163" twix
property $id="cib-bootstrap-options" \
	dc-version="1.1.10-42f2063" \
	cluster-infrastructure="corosync"

first settings

• crm configure <<EOF

 primitive virtual-ip ocf:heartbeat:IPaddr \
 params ip="192.168.244.100" nic="eth0" cidr_netmask="21"
 property stonith-enabled=false
 commit
EOF

drbd

drbd install

• root@twix:~# apt-get install drbd8-utils -y
• root@raider:~# apt-get install drbd8-utils -y

min config

• root@twix:# cat /etc/drbd.conf

global { usage-count yes; } 
common { 
        syncer { rate 100M; } 
        protocol C; 
} 
resource store { 
                device          /dev/drbd0; 
                meta-disk       internal; 
        on twix { 
                disk            /dev/vdb; 
                address         10.0.0.2:7788; 
        } 
        on raider { 
                disk            /dev/vdb; 
                address         10.0.0.3:7788; 
        } 
} 

• root@twix:/etc# sync-us drbd.conf

create drbd md

• root@raider:~# drbdadm create-md store
• root@raider:~# drbdadm create-md store

drbd up

• root@twix:~# drbdadm up store
• root@raider:~# drbdadm up store

check drbd

• cat /proc/drbd

version: 8.4.3 (api:1/proto:86-101)
srcversion: F97798065516C94BE0F27DC 
 0: cs:Connected ro:Secondary/Secondary ds:Inconsistent/Inconsistent C r-----
    ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:10485404

define master

• root@twix:~# drbdsetup /dev/drbd0 primary --o

check drbd

• root@twix:~# cat /proc/drbd

version: 8.4.3 (api:1/proto:86-101)
srcversion: F97798065516C94BE0F27DC 
 0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r---n-
    ns:5246404 nr:0 dw:0 dr:5251800 al:0 bm:319 lo:0 pe:12 ua:5 ap:0 ep:1 wo:f oos:5250716
	[=========>..........] sync'ed: 50.0% (5124/10236)Mfinish: 0:01:15 speed: 69,144 (68,876) K/sec

format

• root@twix:~# mkfs.ext4 /dev/drbd0

disable drbd autostart

• root@twix:~# update-rc.d drbd disable
• root@raider:~# update-rc.d drbd disable

drbd over corosync master slave mode

node $id="167772162" raider
node $id="167772163" twix

<span style ="color:8A2BE2">primitive res-drbd-store ocf:linbit:drbd \
        params drbd_resource="store"
ms ms-drbd-store res-drbd-store \
        meta master-max="1" master-node-max="1" clone-max="2" clone-node-max="1" notify="true" </span>
property $id="cib-bootstrap-options" \
        dc-version="1.1.10-42f2063" \
        cluster-infrastructure="corosync" \
        stonith-enabled="false" \
        default-action-timeout="240" \
        last-lrm-refresh="1426850488"
#vim:set syntax=pcmk

config

node $id="167772162" raider
node $id="167772163" twix
primitive res-drbd-store ocf:linbit:drbd \
        params drbd_resource="store"

primitive res-fs-store ocf:heartbeat:Filesystem \
        params device="/dev/drbd0" directory="/store" fstype="ext4"

primitive res-nfs-kernel-server lsb:nfs-kernel-server \
        op monitor interval="30s"

ms ms-drbd-store res-drbd-store \
        meta master-max="1" master-node-max="1" clone-max="2" clone-node-max="1" notify="true"

colocation c-export-on-drbd inf: res-fs-store res-nfs-kernel-server ms-drbd-store:Master

order o_drbd_before_nfs inf: ms-drbd-store:promote res-fs-store:start

property $id="cib-bootstrap-options" \
        dc-version="1.1.10-42f2063" \
        cluster-infrastructure="corosync" \
        stonith-enabled="false" \
        default-action-timeout="240" \
        last-lrm-refresh="1426850488"

links

• http://www.sebastien-han.fr/blog/2012/04/30/failover-active-passive-on-nfs-using-pacemaker-and-drbd/
• http://www.tokiwinter.com/clustering-with-drbd-corosync-and-pacemaker/
• https://wiki.debianforum.de/HA_Cluster_erstellen
• https://www.suse.com/documentation/sle_ha/singlehtml/book_sleha_techguides/book_sleha_techguides.html
• http://www.linux-ha.org/wiki/Resource_Agents