Create DRBD Partitions on disk (Both Nodes)
The commands below assume that /dev/sdb will be used for the DRBD partition.
...
Code Block |
---|
fdisk -l /dev/sdb
-->
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
Disk /dev/sdb: 274.9 GB, 274877906944 bytes, 536870912 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: gpt
Disk identifier: E7FF3D92-84BB-44E1-B0B0-26150DB80639
# Start End Size Type Name
1 2048 536868863 256G Microsoft basic primary |
Install DRBD Repos (Both Nodes)
Code Block |
---|
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm |
Install DRBD Modules (Both Nodes)
Code Block |
---|
yum -y install drbd84-utils kmod-drbd84 |
Code Block |
---|
firewall-cmd --zone=public --add-port=7788-7799/tcp --permanent
firewall-cmd --reload |
...
Note: it has been observed, that the fully qualified host name is required in the configuration file. If the first step below fails, then try with the fully qualified host name.
Code Block |
---|
drbdadm create-md jtelshared
drbdadm up jtelshared |
Make one node primary (First Node)
Code Block |
---|
drbdadm primary jtelshared --force |
Tune the transfer (Second Node)
Code Block |
---|
drbdadm disk-options --c-plan-ahead=0 --resync-rate=110M jtelshared |
Create filesystem (Primary Node)
Code Block |
---|
mkfs.xfs -L data /dev/drbd1 |
Create fstab entry for file system (both nodes)
Add the following line to /etc/fstab
Code Block |
---|
/dev/drbd/by-res/jtelshared/0 /srv/jtel/shared xfs noauto,noatime,nodiratime 0 0 |
Mount the file system (primary node)
Add the following line to /etc/fstab
Code Block |
---|
mkdir /srv/jtel
mkdir /srv/jtel/shared
chown -R jtel:jtel /srv/jtel
mount /srv/jtel/shared |
Wait for initial sync to complete
Code Block |
---|
cat /proc/drbd
-->
# When not yet done:
version: 8.4.10-1 (api:1/proto:86-101)
GIT-hash: a4d5de01fffd7e4cde48a080e2c686f9e8cebf4c build by mockbuild@, 2017-09-15 14:23:22
1: cs:SyncTarget ro:Secondary/Primary ds:Inconsistent/UpToDate C r-----
ns:0 nr:3955712 dw:3950592 dr:0 al:8 bm:0 lo:5 pe:0 ua:5 ap:0 ep:1 wo:f oos:264474588
[>....................] sync'ed: 1.5% (258272/262132)M
finish: 2:08:08 speed: 34,388 (25,652) want: 112,640 K/sec
-->
# When done:
version: 8.4.10-1 (api:1/proto:86-101)
GIT-hash: a4d5de01fffd7e4cde48a080e2c686f9e8cebf4c build by mockbuild@, 2017-09-15 14:23:22
1: cs:Connected ro:Secondary/Primary ds:UpToDate/UpToDate C r-----
ns:0 nr:15626582 dw:284051762 dr:0 al:8 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0 |
Untune the transfer (Second Node)
Code Block |
---|
drbdadm adjust jtelshared |
Make second node primary and mount the file system (Secondary node)
Add the following line to /etc/fstab
Code Block |
---|
mkdir /srv/jtel
mkdir /srv/jtel/shared
chown -R jtel:jtel /srv/jtel
drbdadm primary jtelshared |
Install Samba and lsof (Both Nodes)
Code Block |
---|
|
yum -y install samba samba-client lsof |
Code Block |
---|
|
cat <<EOFF > /etc/samba/smb.conf
[global]
workgroup = SAMBA
security = user
passdb backend = tdbsam
printing = cups
printcap name = cups
load printers = yes
cups options = raw
min protocol = NT1
ntlm auth = yes
[homes]
comment = Home Directories
valid users = %S, %D%w%S
browseable = No
read only = No
inherit acls = Yes
[printers]
comment = All Printers
path = /var/tmp
printable = Yes
create mask = 0600
browseable = No
[print$]
comment = Printer Drivers
path = /var/lib/samba/drivers
write list = root
create mask = 0664
directory mask = 0775
[shared]
comment = jtel ACD Shared Directory
read only = no
public = yes
writable = yes
locking = yes
path = /srv/jtel/shared
guest ok = yes
create mask = 0644
directory mask = 0755
force user = jtel
force group = jtel
acl allow execute always = True
EOFF
sed -i -e "s/MYGROUP/WORKGROUP/g" /etc/samba/smb.conf |
Setup SeLinux, jtel User access and Firewall for Samba (Both Nodes)
Code Block |
---|
title | SeLinux, jtel User, Firewall |
---|
|
setsebool -P samba_enable_home_dirs=on samba_export_all_rw=on use_samba_home_dirs=on use_nfs_home_dirs=on
printf 'fireball\nfireball\n' | smbpasswd -a -s jtel
firewall-cmd --zone=public --add-port=445/tcp --add-port=139/tcp --add-port=138/udp --add-port=137/udp --permanent
firewall-cmd --reload |
...
Code Block |
---|
|
useradd -m Administrator
printf 'F1r3B²11\nF1r3B²11\n' | smbpasswd -a -s Administrator
|
Test SAMBA (Both Nodes)
This test should be performed on the node which currently has /srv/jtel/shared mounted:
Code Block |
---|
|
mount /srv/jtel/shared
service nmb start
service smb start
# Now check access to the SMB share via (for example) one of the windows machines.
service smb stop
service nmb stop
umount /srv/jtel/shared
# do same again on other node |
Unmount (Both Nodes), disable SAMBA
Code Block |
---|
|
service smb stop
service nmb stop
umount /srv/jtel/shared
systemctl disable smb |
Install PCS Services (Both Nodes)
See Redundancy - Installing PCS Cluster.
Setup virtual IP (One Node Only!)
Change the following to set the virtual IP which should be shared between the nodes.
Code Block |
---|
|
KE_VIP=10.4.8.22 |
Configure the PCS resources with the following commands:
Code Block |
---|
title | Configure PCS Resources |
---|
|
pcs resource create ClusterDataJTELSharedMount ocf:heartbeat:Filesystem device="/dev/drbd/by-res/jtelshared/0" directory="/srv/jtel/shared" fstype="xfs" --group=jtel_portal_group
pcs resource create ClusterIP ocf:heartbeat:IPaddr2 ip=${KE_VIP} cidr_netmask=32 op monitor interval=30s --group=jtel_portal_group
pcs resource create samba systemd:smb op monitor interval=30s --group=jtel_portal_group
pcs constraint order start ClusterDataJTELSharedMount then ClusterIP
pcs constraint order start ClusterIP then samba |
Test
Test as follows:
Code Block |
---|
|
pcs status
--> shows the status of the newly created resources on both nodes, one node should be active.
Cluster name: portal
Stack: corosync
Current DC: uk-acd-store2 (version 1.1.16-12.el7_4.8-94ff4df) - partition with quorum
Last updated: Mon Mar 19 15:40:24 2018
Last change: Mon Mar 19 15:40:16 2018 by root via cibadmin on uk-acd-store1
2 nodes configured
3 resources configured
Online: [ uk-acd-store1 uk-acd-store2 ]
Full list of resources:
Resource Group: jtel_portal_group
ClusterDataJTELSharedMount (ocf::heartbeat:Filesystem): Started uk-acd-store1
ClusterIP (ocf::heartbeat:IPaddr2): Started uk-acd-store1
samba (systemd:smb): Started uk-acd-store1
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled |
...
Code Block |
---|
|
# Failover to node 2
pcs cluster standby uk-acd-store1
# ... (wait)
pcs status
# Then test the availability of the files from the windows machines.
# Create a new file before failing back (to make sure DRBD working ok).
# Fail back to node 1
pcs cluster unstandby uk-acd-store1
pcs cluster standby uk-acd-store2
# ... (wait)
pcs status
# Then test the availability of the files from the windows machines.
# Check that the new file created above is available.
# Unstandby node 2
pcs cluster unstandby uk-acd-store2 |
Manually link /home/jtel/shared
Code Block |
---|
title | link /home/jtel/shared |
---|
|
ln -s /srv/jtel/shared /home/jtel/shared |