Create SSH keys for the two nodes:
[root@master ~]# ssh-keygen -f /root/.ssh/id_rsa -t rsa -N ''
[root@master ~]# ls -lh .ssh/
total 8.0K
-rw-------. 1 root root 1.7K Jul 8 12:33 id_rsa
-rw-r--r--. 1 root root 400 Jul 8 12:33 id_rsa.pub
[root@master ~]# ssh-copy-id node1
[root@node1 ~]# ssh-keygen -f /root/.ssh/id_rsa -t rsa -N ''
[root@node1 ~]# ls -lh .ssh/
total 8.0K
-rw-------. 1 root root 1.7K Jul 8 12:33 id_rsa
-rw-r--r--. 1 root root 400 Jul 8 12:33 id_rsa.pub
[root@node1 ~]# ssh-copy-id master
Install docker on both nodes:
[root@master ~]# yum install docker-1.12.6 -y
[root@node1 ~]# yum install docker-1.12.6 -y
Disable LVM cluster feature on both nodes:
[root@master ~]# lvmconf --disable-cluster
[root@master ~]# echo $?
0
[root@node1 ~]# lvmconf --disable-cluster
[root@node1 ~]# echo $?
0
Configure Docker storage to use logical volume will be created on "/dev/vdb" disk for both nodes:
[root@master ~]# fdisk -l /dev/vdb
Disk /dev/vdb: 42.9 GB, 42949672960 bytes, 83886080 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
[root@master ~]# cp -av /etc/sysconfig/docker-storage-setup /root/orig_files/
‘/etc/sysconfig/docker-storage-setup’ -> ‘/root/orig_files/docker-storage-setup’
[root@master ~]# grep -v ^# /etc/sysconfig/docker-storage-setup | awk NF
CONTAINER_THINPOOL=docker-pool
[root@master ~]# vim /etc/sysconfig/docker-storage-setup
[root@master ~]# grep -v ^# /etc/sysconfig/docker-storage-setup | awk NF
DEVS=vdb
VG=docker-vg
[root@master ~]# docker-storage-setup
INFO: Writing zeros to first 4MB of device /dev/vdb
4+0 records in
4+0 records out
4194304 bytes (4.2 MB) copied, 0.256067 s, 16.4 MB/s
INFO: Device node /dev/vdb1 exists.
Physical volume "/dev/vdb1" successfully created.
Volume group "docker-vg" successfully created
Using default stripesize 64.00 KiB.
Rounding up size to full physical extent 44.00 MiB
Thin pool volume with chunk size 512.00 KiB can address at most 126.50 TiB of data.
Logical volume "docker-pool" created.
Logical volume docker-vg/docker-pool changed.
[root@master ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/vda2 rhel_master lvm2 a-- <79.00g 4.00m
/dev/vdb1 docker-vg lvm2 a-- <40.00g 24.00g
[root@master ~]# vgs
VG #PV #LV #SN Attr VSize VFree
docker-vg 1 1 0 wz--n- <40.00g 24.00g
rhel_master 1 3 0 wz--n- <79.00g 4.00m
[root@master ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
docker-pool docker-vg twi-a-t--- 15.91g 0.00 0.09
home rhel_master -wi-ao---- 23.33g
root rhel_master -wi-ao---- <47.79g
swap rhel_master -wi-ao---- <7.88g
[root@master ~]# cat /etc/sysconfig/docker-storage
DOCKER_STORAGE_OPTIONS="--storage-driver devicemapper --storage-opt dm.fs=xfs --storage-opt dm.thinpooldev=/dev/mapper/docker--vg-docker--pool --storage-opt dm.use_deferred_removal=true --storage-opt dm.use_deferred_deletion=true "
[root@node1 ~]# fdisk -l /dev/vdb
Disk /dev/vdb: 42.9 GB, 42949672960 bytes, 83886080 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
[root@node1 ~]# cp -av /etc/sysconfig/docker-storage-setup /root/orig_files/
‘/etc/sysconfig/docker-storage-setup’ -> ‘/root/orig_files/docker-storage-setup’
[root@node1 ~]# grep -v ^# /etc/sysconfig/docker-storage-setup | awk NF
CONTAINER_THINPOOL=docker-pool
[root@node1 ~]# vim /etc/sysconfig/docker-storage-setup
[root@node1 ~]# grep -v ^# /etc/sysconfig/docker-storage-setup | awk NF
DEVS=vdb
VG=docker-vg
[root@node1 ~]# docker-storage-setup
INFO: Writing zeros to first 4MB of device /dev/vdb
4+0 records in
4+0 records out
4194304 bytes (4.2 MB) copied, 0.273737 s, 15.3 MB/s
INFO: Device node /dev/vdb1 exists.
Physical volume "/dev/vdb1" successfully created.
Volume group "docker-vg" successfully created
Using default stripesize 64.00 KiB.
Rounding up size to full physical extent 44.00 MiB
Thin pool volume with chunk size 512.00 KiB can address at most 126.50 TiB of data.
Logical volume "docker-pool" created.
Logical volume docker-vg/docker-pool changed.
[root@node1 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/vda2 rhel_node1 lvm2 a-- <39.00g 4.00m
/dev/vdb1 docker-vg lvm2 a-- <40.00g 24.00g
[root@node1 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
docker-vg 1 1 0 wz--n- <40.00g 24.00g
rhel_node1 1 2 0 wz--n- <39.00g 4.00m
[root@node1 ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
docker-pool docker-vg twi-a-t--- 15.91g 0.00 0.09
root rhel_node1 -wi-ao---- <35.12g
swap rhel_node1 -wi-ao---- <3.88g
[root@node1 ~]# cat /etc/sysconfig/docker-storage
DOCKER_STORAGE_OPTIONS="--storage-driver devicemapper --storage-opt dm.fs=xfs --storage-opt dm.thinpooldev=/dev/mapper/docker--vg-docker--pool --storage-opt dm.use_deferred_removal=true --storage-opt dm.use_deferred_deletion=true "
Enable and Start "docker" service on both nodes:
[root@master ~]# systemctl enable docker --now
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
[root@master ~]# systemctl status docker --now
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
Active: active (running) since Sun 2018-07-08 12:49:49 CEST; 5s ago
Docs: http://docs.docker.com
Main PID: 2541 (dockerd-current)
CGroup: /system.slice/docker.service
├─2541 /usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current --default-runtime=docker-runc --authorization-plugin=rhel-push-plugin --ex...
└─2549 /usr/bin/docker-containerd-current -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --shim docker-containerd-shim --metrics-interval=0 --start-timeout ...
[root@node1 ~]# systemctl enable docker --now
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
[root@node1 ~]# systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
Active: active (running) since Sun 2018-07-08 12:55:17 CEST; 6s ago
Docs: http://docs.docker.com
Main PID: 2485 (dockerd-current)
CGroup: /system.slice/docker.service
├─2485 /usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current --default-runtime=docker-runc --authorization-plu...
└─2491 /usr/bin/docker-containerd-current -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --shim docker-containerd-shim --metrics-in...
Create cold snapshots:
[root@master ~]# poweroff
[root@node1 ~]# poweroff
virsh # snapshot-create-as openshift-master 03_docker --description "After installaing and enable docker-1.12.6"
Domain snapshot 03_docker created
virsh # snapshot-create-as openshift-node1 03_docker --description "After installaing and enable docker-1.12.6"
Domain snapshot 03_docker created
virsh # snapshot-list openshift-master
Name Creation Time State
------------------------------------------------------------
00_fresh_os 2018-07-07 11:47:50 +0200 shutoff
01_ready_to_install 2018-07-07 12:25:48 +0200 shutoff
02_dnsmasq 2018-07-08 12:25:15 +0200 shutoff
03_docker 2018-07-08 12:59:00 +0200 shutoff
virsh # snapshot-list openshift-node1
Name Creation Time State
------------------------------------------------------------
00_fresh_os 2018-07-07 12:49:20 +0200 shutoff
01_ready_to_install 2018-07-07 12:55:12 +0200 shutoff
02_dnsmasq 2018-07-08 12:31:43 +0200 shutoff
03_docker 2018-07-08 12:59:08 +0200 shutoff
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