Create LVM Physical Volume, Volume Group and Logical Volume
The commands below assume that /dev/sdb will be used for the DRBD partition.
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# Create the phsyical volume - this is based on sdb assuming it is the second drive on the system
lvm pvcreate /dev/sdb
# Create the volume group
lvm vgcreate "vg_drbd_jtelshared" /dev/sdb
# Create the logical volume
lvm lvcreate -l +100%FREE vg_drbd_jtelshared -n lv_drbd_jtelshared |
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# Prepare the firewall
firewall-cmd --zone=public --add-port=7788-7799/tcp --permanent
firewall-cmd --reload |
Install elrepo to yum
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# Install elrepo
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 and enable DRBD (Both Nodes)
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# Install DRBD
yum -y install drbd84-utils kmod-drbd84
# Enable drbd at boot, and in this session
systemctl enable drbd
systemctl start drbd |
NOTE: The following commands requires the hostname of both machines and the IP Address. These are obtained as follows:
...
Note: it has been observed, that the fully qualified host name is required in the configuration file.
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# Create metadata and start DRBD
drbdadm create-md jtelshared
drbdadm up jtelshared |
Make one node primary (First Node)
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drbdadm primary jtelshared --force |
Tune the transfer (Second Node)
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drbdadm disk-options --c-plan-ahead=0 --resync-rate=110M jtelshared |
Create filesystem (Primary Node)
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mkfs.xfs -L data /dev/drbd0 |
Create fstab entry for file system (both nodes)
Add the following line to /etc/fstab
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/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
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mkdir /srv/jtel
mkdir /srv/jtel/shared
chown -R jtel:jtel /srv/jtel
mount /srv/jtel/shared |
Wait for initial sync to complete
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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)
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drbdadm adjust jtelshared |
Make second node primary and mount the file system (Secondary node)
Add the following line to /etc/fstab
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mkdir /srv/jtel
mkdir /srv/jtel/shared
chown -R jtel:jtel /srv/jtel
drbdadm primary jtelshared |
Install Samba and lsof (Both Nodes)
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yum -y install samba samba-client lsof |
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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)
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title | SeLinux, jtel User, Firewall |
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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 |
...
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useradd -m Administrator
printf 'F1r3B²11\nF1r3B²11\n' | smbpasswd -a -s Administrator
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Test SAMBA (Both Nodes)
This test should be performed on the node which currently has /srv/jtel/shared mounted:
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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
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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.
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KE_VIP=10.4.8.22 |
Configure the PCS resources with the following commands:
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title | Configure PCS Resources |
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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:
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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 |
...
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# 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
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title | link /home/jtel/shared |
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ln -s /srv/jtel/shared /home/jtel/shared |