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DRBD 9 : Configure
2018/07/12
 
Configure DRBD after installing.
This example is based on the environment like follows.
+----------------------+          |          +----------------------+
| [    DRBD Node#1   ] |10.0.0.51 | 10.0.0.52| [    DRBD Node#2   ] |
|   node01.srv.world   +----------+----------+   node02.srv.world   |
|                      |                     |                      |
+----------------------+                     +----------------------+

It's necessarry the server you'd like to install DRBD has free block-device.
[1] Create a Volume Group for DRBD on all Nodes.
[root@node01 ~]#
pvcreate /dev/sdb1

Physical volume "/dev/sdb1" successfully created
[root@node01 ~]#
vgcreate drbdpool /dev/sdb1

Volume group "vg_volume01" successfully created
[2] If Firewalld is running, allow service ports.
[root@node01 ~]#
firewall-cmd --add-port=6996-7800/tcp --permanent

success
[root@node01 ~]#
firewall-cmd --reload

success
[3] On a Node, Initialize DRBD Cluster and add Nodes.
[root@node01 ~]#
drbdmanage init 10.0.0.51

You are going to initialize a new drbdmanage cluster.
CAUTION! Note that:
  * Any previous drbdmanage cluster information may be removed
  * Any remaining resources managed by a previous drbdmanage installation
    that still exist on this system will no longer be managed by drbdmanage

Confirm:

  yes/no: yes
[ 2420.329129] drbd .drbdctrl: Starting worker thread (from drbdsetup [13925])
[ 2420.451483] drbd .drbdctrl/0 drbd0: disk( Diskless -> Attaching )
[ 2420.453513] drbd .drbdctrl/0 drbd0: Maximum number of peer devices = 31
.....
.....
[ 2421.677920] drbd .drbdctrl: Preparing cluster-wide state change 2615618191 (0->-1 3/1)
[ 2421.680499] drbd .drbdctrl: Committing cluster-wide state change 2615618191 (2ms)
[ 2421.682894] drbd .drbdctrl: role( Secondary -> Primary )
Waiting for server: .
Operation completed successfully

# add a Node to DRBD Cluster

[root@node01 ~]#
drbdmanage add-node node02.srv.world 10.0.0.52

[ 2452.989515] drbd .drbdctrl node02.srv.world: Starting sender thread (from drbdsetup [14020])
[ 2452.997518] drbd .drbdctrl node02.srv.world: conn( StandAlone -> Unconnected )
Operation completed successfully
Operation completed successfully
[ 2453.037235] drbd .drbdctrl node02.srv.world: Starting receiver thread (from drbd_w_.drbdctr [13926])
[ 2453.040902] drbd .drbdctrl node02.srv.world: conn( Unconnected -> Connecting )
Host key verification failed.
Give leader time to contact the new node
Operation completed successfully
Operation completed successfully

Join command for node node02.srv.world:
drbdmanage join -p 6999 10.0.0.52 1 node01.srv.world 10.0.0.51 0 twuZE5BAthnZIRyEAAS/
[4] Move to other Nodes except the working Node of previous [3] section, and Join with the command which is shown on [3] section.
[root@node02 ~]#
drbdmanage join -p 6999 10.0.0.52 1 node01.srv.world 10.0.0.51 0 twuZE5BAthnZIRyEAAS/

You are going to join an existing drbdmanage cluster.
CAUTION! Note that:
  * Any previous drbdmanage cluster information may be removed
  * Any remaining resources managed by a previous drbdmanage installation
    that still exist on this system will no longer be managed by drbdmanage

Confirm:

  yes/no: yes
[ 2491.338532] drbd: loading out-of-tree module taints kernel.
[ 2491.343082] drbd: module verification failed: signature and/or required key missing - tainting kernel
[ 2491.364065] drbd: initialized. Version: 9.0.14-1 (api:2/proto:86-113)
.....
.....
[ 2553.012505] drbd .drbdctrl node01.srv.world: conn( StandAlone -> Unconnected )
[ 2553.025846] drbd .drbdctrl node01.srv.world: Starting receiver thread (from drbd_w_.drbdctr [13762])
[ 2553.028899] drbd .drbdctrl node01.srv.world: conn( Unconnected -> Connecting )
Operation completed successfully
[5] Make sute the state of Cluster, it's OK if all states are [ok].
[root@node01 ~]#
drbdadm status

  --==  Thank you for participating in the global usage survey  ==--
The server's response is:

you are the 1527th user to install this version
.drbdctrl role:Primary
  volume:0 disk:UpToDate
  volume:1 disk:UpToDate
  node02.srv.world role:Secondary
    volume:0 peer-disk:UpToDate
    volume:1 peer-disk:UpToDate

[root@node01 ~]#
drbdmanage list-nodes

+--------------------------------------------------+
| Name             | Pool Size | Pool Free | State |
|--------------------------------------------------|
| node01.srv.world |     81916 |     81908 |    ok |
| node02.srv.world |     81916 |     81908 |    ok |
+--------------------------------------------------+
[6] Create a Resource and Volume on DRBD Cluster.
# create [resource01] resource

[root@node01 ~]#
drbdmanage add-resource resource01

Operation completed successfully
[root@node04 ~]#
drbdmanage list-resources

+--------------------+
| Name       | State |
|--------------------|
| resource01 |    ok |
+--------------------+

# add volume with 10G

[root@node01 ~]#
drbdmanage add-volume resource01 10GB

Operation completed successfully
[root@node01 ~]#
drbdmanage list-volumes

+------------------------------------------------+
| Name       | Vol ID |     Size | Minor | State |
|------------------------------------------------|
| resource01 |      0 | 9.31 GiB |   100 |    ok |
+------------------------------------------------+

# deploy resource

# the last number means number of Nodes you'd like to use for this resource

[root@node01 ~]#
drbdmanage deploy-resource resource01 2

Operation completed successfully
# show status : after setting, state is [Inconsistent] (syncing)

[root@node01 ~]#
drbdadm status

.drbdctrl role:Secondary
  volume:0 disk:UpToDate
  volume:1 disk:UpToDate
  node02.srv.world role:Primary
    volume:0 peer-disk:UpToDate
    volume:1 peer-disk:UpToDate

resource01 role:Secondary
  disk:Inconsistent
  node02.srv.world role:Secondary
    replication:SyncTarget peer-disk:UpToDate done:0.07

# after finishing syncing, state turned like follows

[root@node01 ~]#
drbdadm status

.drbdctrl role:Secondary
  volume:0 disk:UpToDate
  volume:1 disk:UpToDate
  node02.srv.world role:Primary
    volume:0 peer-disk:UpToDate
    volume:1 peer-disk:UpToDate

resource01 role:Secondary
  disk:UpToDate
  node02.srv.world role:Secondary
    peer-disk:UpToDate
[7] It's OK to configure DRBD, create file system on DRBD device and mount it to use.
# the number of [/dev/drbd***], it's the number of [Minor] value that is shown with the command [drbdmanage list-volumes]

[root@node01 ~]#
mkfs.xfs /dev/drbd100

[root@node01 ~]#
mkdir /drbd_disk

[root@node01 ~]#
mount /dev/drbd100 /drbd_disk

[root@node01 ~]#
df -hT

Filesystem          Type      Size  Used Avail Use% Mounted on
/dev/mapper/cl-root xfs        26G  1.7G   25G   7% /
devtmpfs            devtmpfs  2.0G     0  2.0G   0% /dev
tmpfs               tmpfs     2.0G     0  2.0G   0% /dev/shm
tmpfs               tmpfs     2.0G  8.5M  2.0G   1% /run
tmpfs               tmpfs     2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/vda1           xfs      1014M  238M  777M  24% /boot
tmpfs               tmpfs     396M     0  396M   0% /run/user/0
/dev/drbd100        xfs       9.4G   33M  9.3G   1% /drbd_disk

# create a test file

[root@node01 ~]#
echo 'test file' > /drbd_disk/test.txt

[root@node01 ~]#
ll /drbd_disk

total 4
-rw-r--r--. 1 root root 10 Jul 12 19:54 test.txt
[8] To mount DRBD device on the secondary Host, do it like follows.
########### on primary Node ###########

# unmount and get secondary role

[root@node01 ~]#
umount /drbd_disk

[root@node01 ~]#
drbdadm secondary resource01
########### on secondary Node ###########

# get primary role and mount

[root@node02 ~]#
drbdadm primary resource01

[root@node02 ~]#
mount /dev/drbd100 /drbd_disk

[root@node02 ~]#
df -hT

Filesystem          Type      Size  Used Avail Use% Mounted on
/dev/mapper/cl-root xfs        26G  1.6G   25G   6% /
devtmpfs            devtmpfs  2.0G     0  2.0G   0% /dev
tmpfs               tmpfs     2.0G     0  2.0G   0% /dev/shm
tmpfs               tmpfs     2.0G  8.5M  2.0G   1% /run
tmpfs               tmpfs     2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/vda1           xfs      1014M  238M  777M  24% /boot
tmpfs               tmpfs     396M     0  396M   0% /run/user/0
/dev/drbd100        xfs       9.4G   33M  9.3G   1% /drbd_disk

[root@node02 ~]#
ll /drbd_disk

total 4
-rw-r--r--. 1 root root 10 Jul 12 19:54 test.txt
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