centos7.4 docker环境搭建ceph集群
docker镜像
docker pull ceph/daemon:latest-luminous
注意下载的ceph镜像版本需要指定为latest-luminous，网上其他的docker搭建讲解都是latest，他们留下文档时间太早。
启动mon服务
#docker run -d --net=host --name=mon -v /etc/ceph:/etc/ceph -v /var/lib/ceph:/var/lib/ceph -e MON_IP=192.168.0.21 -e CEPH_PUBLIC_NETWORK=192.168.0.0/24 ceph/daemon:latest-luminous mon
192.168.0.21是部署的物理机或云主机所在网络
/etc/ceph ; /var/lib/ceph是容器内配置文件所在位置，与外部物理机或云主机做文件映射
检查容器状态
[root@ceph2 etc]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2ec681cdcd27 ceph/daemon:latest-luminous "/opt/ceph-contain..." 2 minutes ago Up 2 minutes mon
[root@ceph2 etc]# docker exec mon ceph -s
cluster:
id: 471883b4-d13c-4d7c-bb39-fe2e77680b23
health: HEALTH_OK
services:
mon: 1 daemons, quorum ceph2
mgr: no daemons active
osd: 0 osds: 0 up, 0 in
data:
pools: 0 pools, 0 pgs
objects: 0 objects, 0B
usage: 0B used, 0B / 0B avail
pgs:
验证mon服务已经启动
这里踩坑，注意要运行luminous版本的ceph容器镜像，否则启动mon时，无法在/var/lib/ceph/bootstrap-osd中无法生成ceph.keyring文件，导致启动osd时找不到该文件，而发生认证失败情况；
启动osd
注意物理机或云主机已经介入硬盘设备
[root@ceph2 etc]# fdisk -l
Disk /dev/vda: 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
Disk label type: dos
Disk identifier: 0x000a5a8a
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 83886079 41942016 83 Linux
Disk /dev/vdb: 32.2 GB, 32212254720 bytes, 62914560 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 /dev/vdc: 107.4 GB, 107374182400 bytes, 209715200 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
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
Disk /dev/vdd: 107.4 GB, 107374182400 bytes, 209715200 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: 8B756319-14C6-4074-86C7-03625EF2FD01
# Start End Size Type Name
1 2048 206847 100M Ceph OSD ceph data
2 3483648 209715166 98.3G unknown ceph block
3 206848 2303999 1G unknown ceph block.db
4 2304000 3483647 576M unknown ceph block.wal
注意这里的/dev/vdb,/dev/vdc,/dev/vdd，尽可能提前格式化
[root@ceph2 etc]# mkfs.ext4 /dev/vdd
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
6553600 inodes, 26214400 blocks
1310720 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2174746624
800 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
本文部署单节点osd，测试使用，所以配置osd副本数为1，并重启mon容器
在/etc/ceph/ceph.conf中添加
osd pool default size = 1
启动osd
#docker run -d --net=host --name=osd --privileged=true --pid=host -v /etc/ceph:/etc/ceph -v /var/lib/ceph:/var/lib/ceph -v /dev/:/dev/ -e OSD_TYPE=disk -e OSD_FORCE_ZAP=1 -e OSD_DEVICE=/dev/vdd ceph/daemon:latest-luminous osd_directory
注意命令中使用的/dev/vdd设备未进行任何挂载
osd状态检查
[root@ceph2 ceph]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS
PORTS NAMES
a4b6896b0f07 ceph/daemon:latest-luminous "/opt/ceph-contain..." About a minute ago Up About a minute osd
5650908f9b11 ceph/daemon:latest-luminous "/opt/ceph-contain..." 9 minutes ago Up 9 minutes mon
[root@ceph2 ceph]# docker exec mon ceph -s
cluster:
id: 4d40f5a8-d291-45b4-b635-492f8b01e9bc
health: HEALTH_WARN
no active mgr
services:
mon: 1 daemons, quorum ceph2
mgr: no daemons active
osd: 1 osds: 1 up, 1 in
data:
pools: 0 pools, 0 pgs
objects: 0 objects, 0B
usage: 0B used, 0B / 0B avail
pgs:
启动mgr
#docker run -d --net=host --name=mgr -v /etc/ceph:/etc/ceph -v /var/lib/ceph:/var/lib/ceph ceph/daemon:latest-luminous mgr
状态检查
[root@ceph2 ceph]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a42d8cfa41ab ceph/daemon:latest-luminous "/opt/ceph-contain..." 3 seconds ago Up 2 seconds mgr
a4b6896b0f07 ceph/daemon:latest-luminous "/opt/ceph-contain..." 2 minutes ago Up 2 minutes osd
5650908f9b11 ceph/daemon:latest-luminous "/opt/ceph-contain..." 10 minutes ago Up 10 minutes mon
[root@ceph2 ceph]# docker exec mon ceph -s
cluster:
id: 4d40f5a8-d291-45b4-b635-492f8b01e9bc
health: HEALTH_OK
services:
mon: 1 daemons, quorum ceph2
mgr: ceph2(active)
osd: 1 osds: 1 up, 1 in
data:
pools: 0 pools, 0 pgs
objects: 0 objects, 0B
usage: 4.56GiB used, 35.4GiB / 40.0GiB avail
pgs:
启动dashboard
[root@ceph2 ceph]# docker exec mon ceph mgr module enable dashboard
[root@ceph2 ceph]# docker exec mon ceph mgr dump
{
"epoch": 42,
"active_gid": 4130,
"active_name": "ceph2",
"active_addr": "192.168.0.21:6804/120",
"available": true,
"standbys": [],
"modules": [
"balancer",
"dashboard",
"restful",
"status"
],
"available_modules": [
"balancer",
"dashboard",
"influx",
"localpool",
"prometheus",
"restful",
"selftest",
"status",
"zabbix"
],
"services": {
"dashboard": "http://ceph2:7000/"
}
}
创建池
# docker exec mon ceph osd pool create swimmingpool 30
创建后，ceph集群状态出现告警
2019-04-14 13:24:04.843747 [INF] Health check cleared: PG_AVAILABILITY (was: Reduced data availability: 30 pgs inactive)
2019-04-14 12:55:18.250747 [WRN] Health check failed: Degraded data redundancy: 30 pgs undersized (PG_DEGRADED)
是pg和数据池的一些配置问题
进行配置
# docker exec mon ceph osd pool set swimmingpool min_size 1
之后集群状态恢复
具体问题参考
https://www.imooc.com/article/43575
出现新问题
2019-04-14 13:25:04.801042 [WRN] Health check failed: Degraded data redundancy: 30 pgs undersized (PG_DEGRADED)
原因是Peering完成后，PG检测到任意一个PG实例存在不一致(需要被同步/修复)的对象，或者当前ActingSet 小于存储池副本数
Degraded说明
降级：由上文可以得知，每个PG有三个副本，分别保存在不同的OSD中，在非故障情况下，这个PG是active+clean 状态，那么，如果PG 的 副本osd.4 挂掉了，这个 PG 是降级状态
降级就是在发生了一些故障比如OSD挂掉之后，Ceph 将这个 OSD 上的所有 PG 标记为 Degraded。
降级的集群可以正常读写数据，降级的 PG 只是相当于小毛病而已，并不是严重的问题。
Undersized的意思就是当前存活的PG 副本数为 2，小于副本数3，将其做此标记，表明存货副本数不足，也不是严重的问题。
创建块
#docker exec mon rbd create --size 1024 swimmingpool/bar
问题记录
1、application not enabled on 1 pool(s) (POOL_APP_NOT_ENABLED)
解决方法：
#docker exec mon ceph osd pool application enable swimmingpool rbd
enabled application 'rbd' on pool 'swimmingpool'
