Public:Esdcluster

Особое внимание документации - очередности действий:

https://docs.linbit.com/man/v9/

Конфигурим на обоих машинах основной конф. файл DRBD системы:

root@esd1-deb10:/mnt# cat /etc/drbd.d/global_common.conf
# DRBD is the result of over a decade of development by LINBIT.
# In case you need professional services for DRBD or have
# feature requests visit http://www.linbit.com

global {
        usage-count yes; 

        # Decide what kind of udev symlinks you want for "implicit" volumes
        # (those without explicit volume <vnr> {} block, implied vnr=0):
        # /dev/drbd/by-resource/<resource>/<vnr>   (explicit volumes)
        # /dev/drbd/by-resource/<resource>         (default for implict)
###     udev-always-use-vnr; # treat implicit the same as explicit volumes 

        # minor-count dialog-refresh disable-ip-verification
        # cmd-timeout-short 5; cmd-timeout-medium 121; cmd-timeout-long 600;
} 

common {
        handlers {
                # These are EXAMPLE handlers only.
                # They may have severe implications,
                # like hard resetting the node under certain circumstances.
                # Be careful when choosing your poison.

                # pri-on-incon-degr "/usr/lib/drbd/notify-pri-on-incon-degr.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
                # pri-lost-after-sb "/usr/lib/drbd/notify-pri-lost-after-sb.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
                # local-io-error "/usr/lib/drbd/notify-io-error.sh; /usr/lib/drbd/notify-emergency-shutdown.sh; echo o > /proc/sysrq-trigger ; halt -f";
                # fence-peer "/usr/lib/drbd/crm-fence-peer.sh";
                # split-brain "/usr/lib/drbd/notify-split-brain.sh root";
                # out-of-sync "/usr/lib/drbd/notify-out-of-sync.sh root";
                # before-resync-target "/usr/lib/drbd/snapshot-resync-target-lvm.sh -p 15 -- -c 16k";
                # after-resync-target /usr/lib/drbd/unsnapshot-resync-target-lvm.sh;
                # quorum-lost "/usr/lib/drbd/notify-quorum-lost.sh root";
        }

        startup {
                # wfc-timeout degr-wfc-timeout outdated-wfc-timeout wait-after-sb
        } 

        options {
                # cpu-mask on-no-data-accessible

                # RECOMMENDED for three or more storage nodes with DRBD 9:
                # quorum majority;
                # on-no-quorum suspend-io | io-error;
        }

        disk {
                # size on-io-error fencing disk-barrier disk-flushes
                # disk-drain md-flushes resync-rate resync-after al-extents
                # c-plan-ahead c-delay-target c-fill-target c-max-rate
                # c-min-rate disk-timeout
        }

       net {
                 protocol C;
###             verify-alg crc32c;
                # protocol timeout max-epoch-size max-buffers
                # connect-int ping-int sndbuf-size rcvbuf-size ko-count
                # allow-two-primaries cram-hmac-alg shared-secret after-sb-0pri
                # after-sb-1pri after-sb-2pri always-asbp rr-conflict
                # ping-timeout data-integrity-alg tcp-cork on-congestion
                # congestion-fill congestion-extents csums-alg verify-alg
                # use-rle
        }
}

... и дополнительный, вкотором особо уделяем внимание опции fencing:

root@esd1-deb10:/mnt# cat /etc/drbd.d/r0.res resource r0 {

       device    /dev/drbd0;
       meta-disk internal;

       on esd1-deb10 {
               disk      /dev/mapper/esd1--deb10--vg-drbd0;
               address   192.168.102.200:7789;
       }

       on esd2-deb10 {
               disk      /dev/mapper/esd2--deb10--vg-drbd0;
               address   192.168.102.201:7789;
       }

       disk {
               fencing resource-and-stonith;
       }

       handlers {
               split-brain "/usr/lib/drbd/notify-split-brain.sh root";

1. before-resync-target "/usr/lib/drbd/snapshot-resync-target-lvm.sh";
2. after-resync-target "/usr/lib/drbd/unsnapshot-resync-target-lvm.sh";

       }

       net {
               allow-two-primaries yes;
               after-sb-0pri discard-zero-changes;
               after-sb-1pri discard-secondary;
               after-sb-2pri disconnect;
       }

       startup {
               become-primary-on both;
       }

}

Теперь выполните на обоих серверах команды, каждая команда на каждом сервере одновременно:

drbdadm disconnect r0
drbdadm connect r0
drbdadm primary r0

/etc/init.d/drbd restart

Теперь у нас есть блочное устройство /dev/drbd0!

root@esd1-deb10:/mnt# cat /proc/drbd version: 8.4.10 (api:1/proto:86-101) srcversion: 9B4D87C5E865DF526864868

0: cs:Connected ro:Primary/Primary ds:UpToDate/UpToDate C r-----
   ns:210772764 nr:529007 dw:1593007 dr:210779726 al:1826 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0

root@esd2-deb10:/mnt# cat /proc/drbd

version: 8.4.10 (api:1/proto:86-101)
srcversion: 15055BDD6F0D23278182874
 0: cs:Connected ro:Primary/Primary ds:UpToDate/UpToDate C r-----
    ns:529014 nr:210772771 dw:211301785 dr:1061397 al:15 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0

Создаем распределенную файловую систему на Distributed Replicated Block Device (DRBD):

mkfs.ocfs2 -N 2 -L ocfs2_drbd0_o2cb --cluster-stack o2cb --cluster-name esdcluster --global-heartbeat -F /dev/drbd0

mkfs.ocfs2 1.8.5
Cluster stack: o2cb
Cluster name: esdcluster
Stack Flags: 0x1
NOTE: Feature extended slot map may be enabled
Overwriting existing ocfs2 partition.
WARNING: Cluster check disabled.
Proceed (y/N): y
Label: ocfs2_drbd0_o2cb
Features: sparse extended-slotmap backup-super unwritten inline-data strict-journal-super xattr indexed-dirs refcount discontig-bg append-dio
Block size: 4096 (12 bits)
Cluster size: 4096 (12 bits)
Volume size: 214741774336 (52427191 clusters) (52427191 blocks)
Cluster groups: 1626 (tail covers 11191 clusters, rest cover 32256 clusters)
Extent allocator size: 109051904 (26 groups)
Journal size: 268435456
Node slots: 2
Creating bitmaps: done
Initializing superblock: done
Writing system files: done
Writing superblock: done
Writing backup superblock: 4 block(s)
Formatting Journals: done
Growing extent allocator: done
Formatting slot map: done
Formatting quota files: done
Writing lost+found: done
mkfs.ocfs2 successful

Полный вывод того, что ФС собралась на обоих машинах:

root@esd1-deb10:/mnt# mounted.ocfs2 -f
Device                             Stack  Cluster  F  Nodes
/dev/mapper/esd1--deb10--vg-drbd0  o2cb   esd         esd1-deb10, esd2-deb10
/dev/drbd0                         o2cb   esd         esd1-deb10, esd2-deb10

root@esd2-deb10:/mnt# mounted.ocfs2 -f
Device                             Stack  Cluster  F  Nodes
/dev/mapper/esd2--deb10--vg-drbd0  o2cb   esd         esd1-deb10, esd2-deb10
/dev/drbd0                         o2cb   esd         esd1-deb10, esd2-deb10

... и краткий:

root@esd1-deb10:/mnt# mounted.ocfs2 -d
Device                             Stack  Cluster  F  UUID                              Label
/dev/mapper/esd1--deb10--vg-drbd0  o2cb   esd         6043DDD2A6444C4CA370575F40E50723  ocfs2_drbd0
/dev/drbd0                         o2cb   esd         6043DDD2A6444C4CA370575F40E50723  ocfs2_drbd0

root@esd2-deb10:/mnt# mounted.ocfs2 -d
Device                             Stack  Cluster  F  UUID                              Label
/dev/mapper/esd2--deb10--vg-drbd0  o2cb   esd         6043DDD2A6444C4CA370575F40E50723  ocfs2_drbd0
/dev/drbd0                         o2cb   esd         6043DDD2A6444C4CA370575F40E50723  ocfs2_drbd0