Comments (4)
jonseymour
commented on July 23, 2024
For example, here is a case where lsblk shows that the docker pool device is mapped across loopback devices when it should be mapped across logical volumes from the datavg volume group
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 29.3G 0 disk
└─sda1 8:1 0 29.3G 0 part /
sdb 8:16 0 14G 0 disk
└─sdb1 8:17 0 14G 0 part /mnt
sdc 8:32 0 512G 0 disk
├─datavg-spherestack (dm-0) 252:0 0 128G 0 lvm /var/lib/sphere-stack
├─datavg-backups (dm-1) 252:1 0 128G 0 lvm /var/lib/backups
├─datavg-docker--data (dm-2) 252:2 0 128G 0 lvm
└─datavg-docker--meta (dm-3) 252:3 0 4G 0 lvm
sdd 8:48 0 128G 0 disk
└─sdd1 8:49 0 128G 0 part
sr0 11:0 1 1.1M 0 rom
loop0 7:0 0 100G 0 loop
└─docker-8:1-528619-pool (dm-4) 252:4 0 100G 0 dm
loop1 7:1 0 2G 0 loop
└─docker-8:1-528619-pool (dm-4) 252:4 0 100G 0 dm
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jonseymour
commented on July 23, 2024
I did some more digging. The issue is not so much that the docker daemon is restarted - it is. The problem is that the thin pool device is not torn down so that when docker restarts with the new storage options, the thin pool device is still bound to the loop back devices.
So:
$ sudo dmsetup table
datavg-spherestack: 0 268435456 linear 8:32 276826112
datavg-docker--data: 0 268435456 linear 8:32 2048
docker-8:1-528625-pool: 0 209715200 thin-pool 7:1 7:0 128 32768 1 skip_block_zeroing
datavg-docker--meta: 0 8388608 linear 8:32 268437504
datavg-backups: 0 268435456 linear 8:32 545261568
$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 29.3G 0 disk
└─sda1 8:1 0 29.3G 0 part /
sdb 8:16 0 14G 0 disk
└─sdb1 8:17 0 14G 0 part /mnt
sdc 8:32 0 512G 0 disk
├─datavg-spherestack (dm-0) 252:0 0 128G 0 lvm /var/lib/sphere-stack
├─datavg-backups (dm-1) 252:1 0 128G 0 lvm /var/lib/backups
├─datavg-docker--data (dm-2) 252:2 0 128G 0 lvm
└─datavg-docker--meta (dm-3) 252:3 0 4G 0 lvm
sdd 8:48 0 128G 0 disk
└─sdd1 8:49 0 128G 0 part
sr0 11:0 1 1.1M 0 rom
loop0 7:0 0 100G 0 loop
└─docker-8:1-528625-pool (dm-4) 252:4 0 100G 0 dm
loop1 7:1 0 2G 0 loop
└─docker-8:1-528625-pool (dm-4) 252:4 0 100G 0 dm
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jonseymour
commented on July 23, 2024
Ok, the issue in my case is that my host is ubuntu 14.04 and these lines:
- name: Set docker daemon options
copy:
content: "DOCKER_OPTS=\"{{ docker_opts.rstrip('\n') }}\""
dest: /etc/default/docker
owner: root
group: root
mode: 0644
notify:
- Reload docker
when: docker_opts != "" and ansible_distribution_version|version_compare(15.04, '<')
don't actually result in the restart of the docker daemon with the new storage options. That is: "Reload docker" silently fails. "Restart docker" would likely have the desired effect, which I will now test.
*Update: * using "Restart docker" rather than "Reload docker" has the expected effect on Ubuntu 14.04. I have submitted a PR ( #90 ) with this change since "Reload docker" doesn't actually do anything on Ubuntu 14.04.
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angstwad
commented on July 23, 2024
Closed by #90
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