Create LVM Physical Volume, Volume Group and Logical Volume (Both Nodes)The commands below assume that /dev/sdb will be used for the DRBD on top of LVM configuration, and that the disks are EXACTLY the same size. | Translations Ignore |
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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 |
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Install elrepo to yum (Both Nodes)| Translations Ignore |
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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 |
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Install and enable DRBD (Both Nodes)| Translations Ignore |
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# Install DRBD
yum -y install drbd84-utils kmod-drbd84 lsof
# Enable drbd at boot, and in this session
systemctl enable drbd
systemctl start drbd |
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NOTE: The following commands requires the hostname of both machines and the IP Address. These are obtained as follows: | Translations Ignore |
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ip addr
hostname |
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Create a DRBD config file for jtelshared on /dev/sdb | Translations Ignore |
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| title | /etc/drbd.d/jtelshared.res |
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| # Configure DRBD
cat <<EOFF > /etc/drbd.d/jtelshared.res
resource jtelshared {
protocol C;
meta-disk internal;
device /dev/drbd0;
syncer {
verify-alg sha1;
}
net {
allow-two-primaries;
}
on acd-store1.jtel.local {
disk /dev/vg_drbd_jtelshared/lv_drbd_jtelshared;
address 10.42.14.98:7789;
}
on acd-store2.jtel.local {
disk /dev/vg_drbd_jtelshared/lv_drbd_jtelshared;
address 10.42.14.198:7789;
}
startup {
become-primary-on both;
}
}
EOFF |
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Note: it has been observed, that the fully qualified host name is required in the configuration file. | Translations Ignore |
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# Create metadata and start DRBD
drbdadm create-md jtelshared
drbdadm up jtelshared |
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Make one node primary (First Node)| Translations Ignore |
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drbdadm primary jtelshared --force |
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Tune the transfer (Second Node)| Translations Ignore |
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drbdadm disk-options --c-plan-ahead=0 --resync-rate=110M jtelshared |
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Wait for initial sync to complete (Either Node)| Translations Ignore |
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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 |
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Untune the transfer and make primary (Second Node)| Translations Ignore |
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drbdadm adjust jtelshared
drbdadm primary jtelshared |
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Create filesystem (First Node)| Translations Ignore |
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mkfs.xfs -L data /dev/drbd/by-res/jtelshared/0 |
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Create fstab entry for file system (Both Nodes)Add the following line to /etc/fstab | Translations Ignore |
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/dev/drbd/by-res/jtelshared/0 /srv/jtel/shared xfs noauto,noatime,nodiratime 0 0 |
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Mount the file system (First Node)| Translations Ignore |
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mkdir /srv/jtel
mkdir /srv/jtel/shared
chown -R jtel:jtel /srv/jtel
mount /srv/jtel/shared |
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Create a test file and Unmount (First Node) | Translations Ignore |
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cat <<EOFF > /srv/jtel/shared/test.txt
test 123
EOFF
umount /srv/jtel/shared |
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Mount the file system and check the test file (Second Node)| Translations Ignore |
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mkdir /srv/jtel
mkdir /srv/jtel/shared
chown -R jtel:jtel /srv/jtel
mount /srv/jtel/shared
cat /srv/jtel/shared/test.txt
# Check contents of file before proceeding
rm /srv/jtel/shared/test.txt
umount /srv/jtel/shared |
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Install Samba and lsof (Both Nodes)| Translations Ignore |
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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 |
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Setup SeLinux, jtel User access and Firewall for Samba (Both Nodes)Replace <password> with the actual password for the jtel user: | Translations Ignore |
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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 '<password>\n<password>\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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If necessary, add further users to samba: | Translations Ignore |
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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: | Translations Ignore |
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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
umount /srv/jtel/shared
# do same again on other node |
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Unmount and disable SAMBA (Both Nodes)| Translations Ignore |
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| service smb stop
umount /srv/jtel/shared
systemctl disable smb |
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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. | Translations Ignore |
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| KE_VIP=10.4.8.22 |
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Configure the PCS resources with the following commands: | Translations Ignore |
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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 |
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TestTest as follows: | Translations Ignore |
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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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Test the file mount: | Translations Ignore |
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| # From the windows machines:
dir \\uk-acd-store\shared |
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Test manual failover: | Translations Ignore |
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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 |
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Manually link /home/jtel/shared (Both Nodes)| Translations Ignore |
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| title | link /home/jtel/shared |
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| ln -s /srv/jtel/shared /home/jtel/shared |
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