Porcelinux: /* config */

2012-09-07T10:52:06Z

config

← Older revision		Revision as of 10:52, 7 September 2012
Line 77:		Line 77:

	/etc/drdb.d/r0.res		/etc/drdb.d/r0.res
	~~--------~~
			<pre>
	global {		global {
	usage-count yes;		usage-count yes;
Line 98:		Line 99:
	}		}
	}		}
	~~--------~~		</pre>

			<pre>
	resource r0 {		resource r0 {
	device /dev/drbd1;		device /dev/drbd1;
Line 110:		Line 113:
	}		}
	}		}
			</pre>

			* common (changes for dual-primary mode)

	~~common (changes for dual-primary mode)~~		<pre>
	~~------~~
	startup {		startup {
	become-primary-on both;		become-primary-on both;

	net {		net {
	allow-two-primaries;		allow-two-primaries;
			</pre>
	* split brain (and its policies):		* split brain (and its policies):
	handlers {		handlers {
Line 126:		Line 130:
	after-sb-1pri discard-secondary;		after-sb-1pri discard-secondary;
	after-sb-2pri disconnect;		after-sb-2pri disconnect;
			</pre>
	-- meaning sequentially:		-- meaning sequentially:
	[ If there is any host on which no changes occurred at all, simply apply all modifications made on the other and continue.]		[ If there is any host on which no changes occurred at all, simply apply all modifications made on the other and continue.]
Line 132:		Line 136:

	* limiting speed?		* limiting speed?

	syncer {		syncer {
	rate 16M;		rate 16M;

	* verification: ~~(needed ?)~~		* verification:
	syncer {		syncer {
	verify-alg sha1;		verify-alg sha1;
	}		}

	* checksum ?		* checksum ?
	syncer {		syncer {
	csums-alg sha1;		csums-alg sha1;

	* error handling: (recommended)		* error handling: (recommended)
	disk {		disk {
	on-io-error detach;		on-io-error detach;

	* replication traffic integrity:		* replication traffic integrity:
			net {
	net {		data-integrity-alg sha1
	data-integrity-alg sha1

	* disk flushes		* disk flushes
Line 162:		Line 164:
	no-md-flushes;		no-md-flushes;

	~~+++++++++++++++++~~		drbdadm verify resource

	~~drbdadm verify resource~~
	* possible scheduling from crond		* possible scheduling from crond
	42 0 * * 0 root /sbin/drbdadm verify resource		42 0 * * 0 root /sbin/drbdadm verify resource


	* network:		* network ports: 7788-7799
	~~ports~~ 7788-7799

	== first start ==		== first start ==

Xunil at 14:59, 8 May 2012

2012-05-08T14:59:07Z

Show changes

Xunil: Created page with " = fedora = ln -sf /lib/systemd/system/runlevel3.target /etc/systemd/system/default.target yum -y groupinstall Clustering yum -y groupinstall “Cluster Storage” yum -y o..."

2012-05-08T13:03:06Z

Created page with " = fedora = ln -sf /lib/systemd/system/runlevel3.target /etc/systemd/system/default.target yum -y groupinstall Clustering yum -y groupinstall “Cluster Storage” yum -y o..."

New page

= fedora =

ln -sf /lib/systemd/system/runlevel3.target /etc/systemd/system/default.target

yum -y groupinstall Clustering
yum -y groupinstall “Cluster Storage”
yum -y openssh-server
chkconfig sshd on

#disabled firewall (for testing)
chkconfig iptables off

# disable selinux (for testing)
setenforce 0 (and also in /etc/selinux/config )

= net =

/etc/hosts
192.168.55.1 hostsrv
192.168.55.101 virtualb02
192.168.55.102 virtualb01

= DRBD =

* using official howto:
http://www.drbd.org/users-guide-8.3/ch-admin.html

== install ==

* version 8.3.11

yum install drbd

* disk

/dev/sdb1 2048 2097151 1047552 83 Linux

== config ==

/etc/drdb.d/

/etc/drdb.d/r0.res
--------
global {
usage-count yes;
}
common {
protocol C;
}
resource r0 {
on virtualb01 {
device /dev/drbd1;
disk /dev/sdb1;
address 192.168.55.102:7789;
meta-disk internal;
}
on virtualb02 {
device /dev/drbd1;
disk /dev/sdb1;
address 192.168.55.101:7789;
meta-disk internal;
}
}
--------
resource r0 {
device /dev/drbd1;
disk /dev/sdb1;
meta-disk internal;
on virtualb01 {
address 192.168.55.102:7789;
}
on virtualb02 {
address 192.168.55.101:7789;
}
}

common (changes for dual-primary mode)
------
startup {
become-primary-on both;

net {
allow-two-primaries;

* split brain (and its policies):
handlers {
split-brain "/usr/lib/drbd/notify-split-brain.sh root";
net {
after-sb-0pri discard-zero-changes;
after-sb-1pri discard-secondary;
after-sb-2pri disconnect;

-- meaning sequentially:
[ If there is any host on which no changes occurred at all, simply apply all modifications made on the other and continue.]
[ Whichever host is currently in the Secondary role, make that host the split brain victim.]

* limiting speed?

syncer {
rate 16M;

* verification: (needed ?)
syncer {
verify-alg sha1;
}

* checksum ?
syncer {
csums-alg sha1;

* error handling: (recommended)
disk {
on-io-error detach;

* replication traffic integrity:

net {
data-integrity-alg sha1

* disk flushes
** replicated data set
disk {
no-disk-flushes;
** DRBD's meta data
disk {
no-md-flushes;

+++++++++++++++++

drbdadm verify resource
* possible scheduling from crond
42 0 * * 0 root /sbin/drbdadm verify resource

* network:
ports 7788-7799

== first start ==

[root@virtualb01 ~]# drbdadm create-md r0
Writing meta data...
initializing activity log
NOT initialized bitmap
New drbd meta data block successfully created.
success

== quick commands ==

drbd-overview # Checking DRBD status
watch cat /proc/drbd # same, but old school way..
drbdadm up resource
drbdadm primary resource # promote node
drbdadm disconnect resource
drbdadm connect resource
drbdadm verify resource
drbdadm dump-md resource > /tmp/metadata # backing up metadata
drbdsetup /dev/drbd1 syncer -r 110M # changing speed at runtime
drbdadm adjust resource # revert to startup setting
drbdadm resize resource
drbdadm -- --size=new-size resize resource # shrink (online)

== remarks ==

You’ll want these settings:

disk {
fencing resource-and-stonith;
}
handlers {
# Make sure the other node is confirmed
# dead after this!
outdate-peer "/sbin/kill-other-node.sh";
}

= GFS =

= just notes =

[root@virtualb01 ~]# drbdadm create-md r0
Writing meta data...
initializing activity log
NOT initialized bitmap
New drbd meta data block successfully created.
success
[root@virtualb01 ~]# drbdadm attach r0
[root@virtualb01 ~]# drbdadm syncer r0
[root@virtualb01 ~]#

---
The server's response is:

node already registered
Writing meta data...
initializing activity log
NOT initialized bitmap
New drbd meta data block successfully created.
success
[root@virtualb02 ~]# drbdadm attach r0
[root@virtualb02 ~]# drbdadm syncer r0
[root@virtualb02 ~]# drbdadm connect r0
1: Failure: (125) Device has a net-config (use disconnect first)
Command 'drbdsetup 1 net ipv4:192.168.55.101:7789 ipv4:192.168.55.102:7789 C --set-defaults --create-device --after-sb-2pri=disconnect --after-sb-1pri=discard-secondary --after-sb-0pri=discard-zero-changes --allow-two-primaries' terminated with exit code 10
[root@virtualb02 ~]#

[root@virtualb01 ~]# cat /proc/drbd
version: 8.3.11 (api:88/proto:86-96)
srcversion: 21CA73FE6D7D9C67B0C6AB2

1: cs:SyncTarget ro:Primary/Primary ds:Inconsistent/UpToDate C r-----
ns:0 nr:24148 dw:23552 dr:76 al:0 bm:1 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:1023932
[>....................] sync'ed: 2.8% (1023932/1047484)K
finish: 0:13:00 speed: 1,308 (1,308) want: 250 K/sec
[root@virtualb01 ~]#

[root@virtualb02 ~]# cat /proc/drbd
version: 8.3.11 (api:88/proto:86-96)
srcversion: 21CA73FE6D7D9C67B0C6AB2

1: cs:SyncSource ro:Primary/Primary ds:UpToDate/Inconsistent C r-----
ns:20308 nr:0 dw:0 dr:20980 al:0 bm:1 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:1027772
[>....................] sync'ed: 2.4% (1027772/1047484)K
finish: 0:12:50 speed: 1,312 (1,312) K/sec

## resource devices #################

[root@virtualb02 ~]# ls -Rl /dev/drbd
/dev/drbd:
total 0
drwxr-xr-x 2 root root 60 May 8 14:28 by-disk
drwxr-xr-x 2 root root 60 May 8 14:28 by-res

/dev/drbd/by-disk:
total 0
lrwxrwxrwx 1 root root 11 May 8 14:28 sdb1 -> ../../drbd1

/dev/drbd/by-res:
total 0
lrwxrwxrwx 1 root root 11 May 8 14:28 r0 -> ../../drbd1

++++++++++++++++++++++

[root@virtualb01 ~]# ls -Rl /dev/drbd
/dev/drbd:
total 0
drwxr-xr-x 2 root root 60 May 8 14:28 by-disk
drwxr-xr-x 2 root root 60 May 8 14:28 by-res

/dev/drbd/by-disk:
total 0
lrwxrwxrwx 1 root root 11 May 8 14:28 sdb1 -> ../../drbd1

/dev/drbd/by-res:
total 0
lrwxrwxrwx 1 root root 11 May 8 14:28 r0 -> ../../drbd1

DRBD - Revision history

Porcelinux: /* config */

Xunil at 14:59, 8 May 2012

Xunil: Created page with " = fedora = ln -sf /lib/systemd/system/runlevel3.target /etc/systemd/system/default.target yum -y groupinstall Clustering yum -y groupinstall “Cluster Storage” yum -y o..."