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80c0adcb | 1 | [[chapter_pveceph]] |
0840a663 | 2 | ifdef::manvolnum[] |
b2f242ab DM |
3 | pveceph(1) |
4 | ========== | |
404a158e | 5 | :pve-toplevel: |
0840a663 DM |
6 | |
7 | NAME | |
8 | ---- | |
9 | ||
21394e70 | 10 | pveceph - Manage Ceph Services on Proxmox VE Nodes |
0840a663 | 11 | |
49a5e11c | 12 | SYNOPSIS |
0840a663 DM |
13 | -------- |
14 | ||
15 | include::pveceph.1-synopsis.adoc[] | |
16 | ||
17 | DESCRIPTION | |
18 | ----------- | |
19 | endif::manvolnum[] | |
0840a663 | 20 | ifndef::manvolnum[] |
fe93f133 DM |
21 | Manage Ceph Services on Proxmox VE Nodes |
22 | ======================================== | |
49d3ad91 | 23 | :pve-toplevel: |
0840a663 DM |
24 | endif::manvolnum[] |
25 | ||
1ff5e4e8 | 26 | [thumbnail="screenshot/gui-ceph-status.png"] |
8997dd6e | 27 | |
a474ca1f AA |
28 | {pve} unifies your compute and storage systems, i.e. you can use the same |
29 | physical nodes within a cluster for both computing (processing VMs and | |
30 | containers) and replicated storage. The traditional silos of compute and | |
31 | storage resources can be wrapped up into a single hyper-converged appliance. | |
32 | Separate storage networks (SANs) and connections via network attached storages | |
33 | (NAS) disappear. With the integration of Ceph, an open source software-defined | |
34 | storage platform, {pve} has the ability to run and manage Ceph storage directly | |
35 | on the hypervisor nodes. | |
c994e4e5 DM |
36 | |
37 | Ceph is a distributed object store and file system designed to provide | |
1d54c3b4 AA |
38 | excellent performance, reliability and scalability. |
39 | ||
04ba9b24 TL |
40 | .Some advantages of Ceph on {pve} are: |
41 | - Easy setup and management with CLI and GUI support | |
a474ca1f AA |
42 | - Thin provisioning |
43 | - Snapshots support | |
44 | - Self healing | |
a474ca1f AA |
45 | - Scalable to the exabyte level |
46 | - Setup pools with different performance and redundancy characteristics | |
47 | - Data is replicated, making it fault tolerant | |
48 | - Runs on economical commodity hardware | |
49 | - No need for hardware RAID controllers | |
a474ca1f AA |
50 | - Open source |
51 | ||
1d54c3b4 AA |
52 | For small to mid sized deployments, it is possible to install a Ceph server for |
53 | RADOS Block Devices (RBD) directly on your {pve} cluster nodes, see | |
c994e4e5 DM |
54 | xref:ceph_rados_block_devices[Ceph RADOS Block Devices (RBD)]. Recent |
55 | hardware has plenty of CPU power and RAM, so running storage services | |
56 | and VMs on the same node is possible. | |
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57 | |
58 | To simplify management, we provide 'pveceph' - a tool to install and | |
59 | manage {ceph} services on {pve} nodes. | |
60 | ||
a474ca1f | 61 | .Ceph consists of a couple of Daemons footnote:[Ceph intro http://docs.ceph.com/docs/master/start/intro/], for use as a RBD storage: |
1d54c3b4 AA |
62 | - Ceph Monitor (ceph-mon) |
63 | - Ceph Manager (ceph-mgr) | |
64 | - Ceph OSD (ceph-osd; Object Storage Daemon) | |
65 | ||
66 | TIP: We recommend to get familiar with the Ceph vocabulary. | |
67 | footnote:[Ceph glossary http://docs.ceph.com/docs/luminous/glossary] | |
68 | ||
21394e70 DM |
69 | |
70 | Precondition | |
71 | ------------ | |
72 | ||
c994e4e5 DM |
73 | To build a Proxmox Ceph Cluster there should be at least three (preferably) |
74 | identical servers for the setup. | |
21394e70 | 75 | |
a474ca1f AA |
76 | A 10Gb network, exclusively used for Ceph, is recommended. A meshed network |
77 | setup is also an option if there are no 10Gb switches available, see our wiki | |
78 | article footnote:[Full Mesh Network for Ceph {webwiki-url}Full_Mesh_Network_for_Ceph_Server] . | |
21394e70 DM |
79 | |
80 | Check also the recommendations from | |
1d54c3b4 | 81 | http://docs.ceph.com/docs/luminous/start/hardware-recommendations/[Ceph's website]. |
21394e70 | 82 | |
a474ca1f | 83 | .Avoid RAID |
86be506d | 84 | As Ceph handles data object redundancy and multiple parallel writes to disks |
c78756be | 85 | (OSDs) on its own, using a RAID controller normally doesn’t improve |
86be506d TL |
86 | performance or availability. On the contrary, Ceph is designed to handle whole |
87 | disks on it's own, without any abstraction in between. RAID controller are not | |
88 | designed for the Ceph use case and may complicate things and sometimes even | |
89 | reduce performance, as their write and caching algorithms may interfere with | |
90 | the ones from Ceph. | |
a474ca1f AA |
91 | |
92 | WARNING: Avoid RAID controller, use host bus adapter (HBA) instead. | |
93 | ||
21394e70 | 94 | |
58f95dd7 | 95 | [[pve_ceph_install]] |
21394e70 DM |
96 | Installation of Ceph Packages |
97 | ----------------------------- | |
98 | ||
99 | On each node run the installation script as follows: | |
100 | ||
101 | [source,bash] | |
102 | ---- | |
19920184 | 103 | pveceph install |
21394e70 DM |
104 | ---- |
105 | ||
106 | This sets up an `apt` package repository in | |
107 | `/etc/apt/sources.list.d/ceph.list` and installs the required software. | |
108 | ||
109 | ||
110 | Creating initial Ceph configuration | |
111 | ----------------------------------- | |
112 | ||
1ff5e4e8 | 113 | [thumbnail="screenshot/gui-ceph-config.png"] |
8997dd6e | 114 | |
21394e70 DM |
115 | After installation of packages, you need to create an initial Ceph |
116 | configuration on just one node, based on your network (`10.10.10.0/24` | |
117 | in the following example) dedicated for Ceph: | |
118 | ||
119 | [source,bash] | |
120 | ---- | |
121 | pveceph init --network 10.10.10.0/24 | |
122 | ---- | |
123 | ||
a474ca1f | 124 | This creates an initial configuration at `/etc/pve/ceph.conf`. That file is |
c994e4e5 | 125 | automatically distributed to all {pve} nodes by using |
21394e70 DM |
126 | xref:chapter_pmxcfs[pmxcfs]. The command also creates a symbolic link |
127 | from `/etc/ceph/ceph.conf` pointing to that file. So you can simply run | |
128 | Ceph commands without the need to specify a configuration file. | |
129 | ||
130 | ||
d9a27ee1 | 131 | [[pve_ceph_monitors]] |
21394e70 DM |
132 | Creating Ceph Monitors |
133 | ---------------------- | |
134 | ||
1ff5e4e8 | 135 | [thumbnail="screenshot/gui-ceph-monitor.png"] |
8997dd6e | 136 | |
1d54c3b4 AA |
137 | The Ceph Monitor (MON) |
138 | footnote:[Ceph Monitor http://docs.ceph.com/docs/luminous/start/intro/] | |
a474ca1f AA |
139 | maintains a master copy of the cluster map. For high availability you need to |
140 | have at least 3 monitors. | |
1d54c3b4 AA |
141 | |
142 | On each node where you want to place a monitor (three monitors are recommended), | |
143 | create it by using the 'Ceph -> Monitor' tab in the GUI or run. | |
21394e70 DM |
144 | |
145 | ||
146 | [source,bash] | |
147 | ---- | |
148 | pveceph createmon | |
149 | ---- | |
150 | ||
1d54c3b4 AA |
151 | This will also install the needed Ceph Manager ('ceph-mgr') by default. If you |
152 | do not want to install a manager, specify the '-exclude-manager' option. | |
153 | ||
154 | ||
155 | [[pve_ceph_manager]] | |
156 | Creating Ceph Manager | |
157 | ---------------------- | |
158 | ||
a474ca1f | 159 | The Manager daemon runs alongside the monitors, providing an interface for |
1d54c3b4 AA |
160 | monitoring the cluster. Since the Ceph luminous release the |
161 | ceph-mgr footnote:[Ceph Manager http://docs.ceph.com/docs/luminous/mgr/] daemon | |
162 | is required. During monitor installation the ceph manager will be installed as | |
163 | well. | |
164 | ||
165 | NOTE: It is recommended to install the Ceph Manager on the monitor nodes. For | |
166 | high availability install more then one manager. | |
167 | ||
168 | [source,bash] | |
169 | ---- | |
170 | pveceph createmgr | |
171 | ---- | |
172 | ||
21394e70 | 173 | |
d9a27ee1 | 174 | [[pve_ceph_osds]] |
21394e70 DM |
175 | Creating Ceph OSDs |
176 | ------------------ | |
177 | ||
1ff5e4e8 | 178 | [thumbnail="screenshot/gui-ceph-osd-status.png"] |
8997dd6e | 179 | |
21394e70 DM |
180 | via GUI or via CLI as follows: |
181 | ||
182 | [source,bash] | |
183 | ---- | |
184 | pveceph createosd /dev/sd[X] | |
185 | ---- | |
186 | ||
1d54c3b4 AA |
187 | TIP: We recommend a Ceph cluster size, starting with 12 OSDs, distributed evenly |
188 | among your, at least three nodes (4 OSDs on each node). | |
189 | ||
a474ca1f AA |
190 | If the disk was used before (eg. ZFS/RAID/OSD), to remove partition table, boot |
191 | sector and any OSD leftover the following commands should be sufficient. | |
192 | ||
193 | [source,bash] | |
194 | ---- | |
195 | dd if=/dev/zero of=/dev/sd[X] bs=1M count=200 | |
196 | ceph-disk zap /dev/sd[X] | |
197 | ---- | |
198 | ||
199 | WARNING: The above commands will destroy data on the disk! | |
1d54c3b4 AA |
200 | |
201 | Ceph Bluestore | |
202 | ~~~~~~~~~~~~~~ | |
21394e70 | 203 | |
1d54c3b4 AA |
204 | Starting with the Ceph Kraken release, a new Ceph OSD storage type was |
205 | introduced, the so called Bluestore | |
a474ca1f AA |
206 | footnote:[Ceph Bluestore http://ceph.com/community/new-luminous-bluestore/]. |
207 | This is the default when creating OSDs in Ceph luminous. | |
21394e70 DM |
208 | |
209 | [source,bash] | |
210 | ---- | |
1d54c3b4 AA |
211 | pveceph createosd /dev/sd[X] |
212 | ---- | |
213 | ||
214 | NOTE: In order to select a disk in the GUI, to be more failsafe, the disk needs | |
a474ca1f AA |
215 | to have a GPT footnoteref:[GPT, GPT partition table |
216 | https://en.wikipedia.org/wiki/GUID_Partition_Table] partition table. You can | |
217 | create this with `gdisk /dev/sd(x)`. If there is no GPT, you cannot select the | |
218 | disk as DB/WAL. | |
1d54c3b4 AA |
219 | |
220 | If you want to use a separate DB/WAL device for your OSDs, you can specify it | |
a474ca1f AA |
221 | through the '-journal_dev' option. The WAL is placed with the DB, if not |
222 | specified separately. | |
1d54c3b4 AA |
223 | |
224 | [source,bash] | |
225 | ---- | |
a474ca1f | 226 | pveceph createosd /dev/sd[X] -journal_dev /dev/sd[Y] |
1d54c3b4 AA |
227 | ---- |
228 | ||
229 | NOTE: The DB stores BlueStore’s internal metadata and the WAL is BlueStore’s | |
230 | internal journal or write-ahead log. It is recommended to use a fast SSDs or | |
231 | NVRAM for better performance. | |
232 | ||
233 | ||
234 | Ceph Filestore | |
235 | ~~~~~~~~~~~~~ | |
236 | Till Ceph luminous, Filestore was used as storage type for Ceph OSDs. It can | |
237 | still be used and might give better performance in small setups, when backed by | |
238 | a NVMe SSD or similar. | |
239 | ||
240 | [source,bash] | |
241 | ---- | |
242 | pveceph createosd /dev/sd[X] -bluestore 0 | |
243 | ---- | |
244 | ||
245 | NOTE: In order to select a disk in the GUI, the disk needs to have a | |
246 | GPT footnoteref:[GPT] partition table. You can | |
247 | create this with `gdisk /dev/sd(x)`. If there is no GPT, you cannot select the | |
248 | disk as journal. Currently the journal size is fixed to 5 GB. | |
249 | ||
250 | If you want to use a dedicated SSD journal disk: | |
251 | ||
252 | [source,bash] | |
253 | ---- | |
e677b344 | 254 | pveceph createosd /dev/sd[X] -journal_dev /dev/sd[Y] -bluestore 0 |
21394e70 DM |
255 | ---- |
256 | ||
257 | Example: Use /dev/sdf as data disk (4TB) and /dev/sdb is the dedicated SSD | |
258 | journal disk. | |
259 | ||
260 | [source,bash] | |
261 | ---- | |
e677b344 | 262 | pveceph createosd /dev/sdf -journal_dev /dev/sdb -bluestore 0 |
21394e70 DM |
263 | ---- |
264 | ||
265 | This partitions the disk (data and journal partition), creates | |
266 | filesystems and starts the OSD, afterwards it is running and fully | |
1d54c3b4 | 267 | functional. |
21394e70 | 268 | |
1d54c3b4 AA |
269 | NOTE: This command refuses to initialize disk when it detects existing data. So |
270 | if you want to overwrite a disk you should remove existing data first. You can | |
271 | do that using: 'ceph-disk zap /dev/sd[X]' | |
21394e70 DM |
272 | |
273 | You can create OSDs containing both journal and data partitions or you | |
274 | can place the journal on a dedicated SSD. Using a SSD journal disk is | |
1d54c3b4 | 275 | highly recommended to achieve good performance. |
21394e70 DM |
276 | |
277 | ||
07fef357 | 278 | [[pve_ceph_pools]] |
1d54c3b4 AA |
279 | Creating Ceph Pools |
280 | ------------------- | |
21394e70 | 281 | |
1ff5e4e8 | 282 | [thumbnail="screenshot/gui-ceph-pools.png"] |
8997dd6e | 283 | |
1d54c3b4 | 284 | A pool is a logical group for storing objects. It holds **P**lacement |
90682f35 | 285 | **G**roups (`PG`, `pg_num`), a collection of objects. |
1d54c3b4 | 286 | |
90682f35 TL |
287 | When no options are given, we set a default of **128 PGs**, a **size of 3 |
288 | replicas** and a **min_size of 2 replicas** for serving objects in a degraded | |
289 | state. | |
1d54c3b4 | 290 | |
5a54ef44 | 291 | NOTE: The default number of PGs works for 2-5 disks. Ceph throws a |
90682f35 | 292 | 'HEALTH_WARNING' if you have too few or too many PGs in your cluster. |
1d54c3b4 AA |
293 | |
294 | It is advised to calculate the PG number depending on your setup, you can find | |
a474ca1f AA |
295 | the formula and the PG calculator footnote:[PG calculator |
296 | http://ceph.com/pgcalc/] online. While PGs can be increased later on, they can | |
297 | never be decreased. | |
1d54c3b4 AA |
298 | |
299 | ||
300 | You can create pools through command line or on the GUI on each PVE host under | |
301 | **Ceph -> Pools**. | |
302 | ||
303 | [source,bash] | |
304 | ---- | |
305 | pveceph createpool <name> | |
306 | ---- | |
307 | ||
308 | If you would like to automatically get also a storage definition for your pool, | |
309 | active the checkbox "Add storages" on the GUI or use the command line option | |
310 | '--add_storages' on pool creation. | |
21394e70 | 311 | |
1d54c3b4 AA |
312 | Further information on Ceph pool handling can be found in the Ceph pool |
313 | operation footnote:[Ceph pool operation | |
314 | http://docs.ceph.com/docs/luminous/rados/operations/pools/] | |
315 | manual. | |
21394e70 | 316 | |
9fad507d AA |
317 | Ceph CRUSH & device classes |
318 | --------------------------- | |
319 | The foundation of Ceph is its algorithm, **C**ontrolled **R**eplication | |
320 | **U**nder **S**calable **H**ashing | |
321 | (CRUSH footnote:[CRUSH https://ceph.com/wp-content/uploads/2016/08/weil-crush-sc06.pdf]). | |
322 | ||
323 | CRUSH calculates where to store to and retrieve data from, this has the | |
324 | advantage that no central index service is needed. CRUSH works with a map of | |
325 | OSDs, buckets (device locations) and rulesets (data replication) for pools. | |
326 | ||
327 | NOTE: Further information can be found in the Ceph documentation, under the | |
328 | section CRUSH map footnote:[CRUSH map http://docs.ceph.com/docs/luminous/rados/operations/crush-map/]. | |
329 | ||
330 | This map can be altered to reflect different replication hierarchies. The object | |
331 | replicas can be separated (eg. failure domains), while maintaining the desired | |
332 | distribution. | |
333 | ||
334 | A common use case is to use different classes of disks for different Ceph pools. | |
335 | For this reason, Ceph introduced the device classes with luminous, to | |
336 | accommodate the need for easy ruleset generation. | |
337 | ||
338 | The device classes can be seen in the 'ceph osd tree' output. These classes | |
339 | represent their own root bucket, which can be seen with the below command. | |
340 | ||
341 | [source, bash] | |
342 | ---- | |
343 | ceph osd crush tree --show-shadow | |
344 | ---- | |
345 | ||
346 | Example output form the above command: | |
347 | ||
348 | [source, bash] | |
349 | ---- | |
350 | ID CLASS WEIGHT TYPE NAME | |
351 | -16 nvme 2.18307 root default~nvme | |
352 | -13 nvme 0.72769 host sumi1~nvme | |
353 | 12 nvme 0.72769 osd.12 | |
354 | -14 nvme 0.72769 host sumi2~nvme | |
355 | 13 nvme 0.72769 osd.13 | |
356 | -15 nvme 0.72769 host sumi3~nvme | |
357 | 14 nvme 0.72769 osd.14 | |
358 | -1 7.70544 root default | |
359 | -3 2.56848 host sumi1 | |
360 | 12 nvme 0.72769 osd.12 | |
361 | -5 2.56848 host sumi2 | |
362 | 13 nvme 0.72769 osd.13 | |
363 | -7 2.56848 host sumi3 | |
364 | 14 nvme 0.72769 osd.14 | |
365 | ---- | |
366 | ||
367 | To let a pool distribute its objects only on a specific device class, you need | |
368 | to create a ruleset with the specific class first. | |
369 | ||
370 | [source, bash] | |
371 | ---- | |
372 | ceph osd crush rule create-replicated <rule-name> <root> <failure-domain> <class> | |
373 | ---- | |
374 | ||
375 | [frame="none",grid="none", align="left", cols="30%,70%"] | |
376 | |=== | |
377 | |<rule-name>|name of the rule, to connect with a pool (seen in GUI & CLI) | |
378 | |<root>|which crush root it should belong to (default ceph root "default") | |
379 | |<failure-domain>|at which failure-domain the objects should be distributed (usually host) | |
380 | |<class>|what type of OSD backing store to use (eg. nvme, ssd, hdd) | |
381 | |=== | |
382 | ||
383 | Once the rule is in the CRUSH map, you can tell a pool to use the ruleset. | |
384 | ||
385 | [source, bash] | |
386 | ---- | |
387 | ceph osd pool set <pool-name> crush_rule <rule-name> | |
388 | ---- | |
389 | ||
390 | TIP: If the pool already contains objects, all of these have to be moved | |
391 | accordingly. Depending on your setup this may introduce a big performance hit on | |
392 | your cluster. As an alternative, you can create a new pool and move disks | |
393 | separately. | |
394 | ||
395 | ||
21394e70 DM |
396 | Ceph Client |
397 | ----------- | |
398 | ||
1ff5e4e8 | 399 | [thumbnail="screenshot/gui-ceph-log.png"] |
8997dd6e | 400 | |
21394e70 DM |
401 | You can then configure {pve} to use such pools to store VM or |
402 | Container images. Simply use the GUI too add a new `RBD` storage (see | |
403 | section xref:ceph_rados_block_devices[Ceph RADOS Block Devices (RBD)]). | |
404 | ||
1d54c3b4 AA |
405 | You also need to copy the keyring to a predefined location for a external Ceph |
406 | cluster. If Ceph is installed on the Proxmox nodes itself, then this will be | |
407 | done automatically. | |
21394e70 DM |
408 | |
409 | NOTE: The file name needs to be `<storage_id> + `.keyring` - `<storage_id>` is | |
410 | the expression after 'rbd:' in `/etc/pve/storage.cfg` which is | |
411 | `my-ceph-storage` in the following example: | |
412 | ||
413 | [source,bash] | |
414 | ---- | |
415 | mkdir /etc/pve/priv/ceph | |
416 | cp /etc/ceph/ceph.client.admin.keyring /etc/pve/priv/ceph/my-ceph-storage.keyring | |
417 | ---- | |
0840a663 | 418 | |
58f95dd7 TL |
419 | [[pveceph_fs]] |
420 | CephFS | |
421 | ------ | |
422 | ||
423 | Ceph provides also a filesystem running on top of the same object storage as | |
424 | RADOS block devices do. A **M**eta**d**ata **S**erver (`MDS`) is used to map | |
425 | the RADOS backed objects to files and directories, allowing to provide a | |
426 | POSIX-compliant replicated filesystem. This allows one to have a clustered | |
427 | highly available shared filesystem in an easy way if ceph is already used. Its | |
428 | Metadata Servers guarantee that files get balanced out over the whole Ceph | |
429 | cluster, this way even high load will not overload a single host, which can be | |
430 | be an issue with traditional shared filesystem approaches, like `NFS`, for | |
431 | example. | |
432 | ||
433 | {pve} supports both, using an existing xref:storage_cephfs[CephFS as storage]) | |
434 | to save backups, ISO files or container templates and creating a | |
435 | hyper-converged CephFS itself. | |
436 | ||
437 | ||
438 | [[pveceph_fs_mds]] | |
439 | Metadata Server (MDS) | |
440 | ~~~~~~~~~~~~~~~~~~~~~ | |
441 | ||
442 | CephFS needs at least one Metadata Server to be configured and running to be | |
443 | able to work. One can simply create one through the {pve} web GUI's `Node -> | |
444 | CephFS` panel or on the command line with: | |
445 | ||
446 | ---- | |
447 | pveceph mds create | |
448 | ---- | |
449 | ||
450 | Multiple metadata servers can be created in a cluster. But with the default | |
451 | settings only one can be active at any time. If an MDS, or its node, becomes | |
452 | unresponsive (or crashes), another `standby` MDS will get promoted to `active`. | |
453 | One can speed up the hand-over between the active and a standby MDS up by using | |
454 | the 'hotstandby' parameter option on create, or if you have already created it | |
455 | you may set/add: | |
456 | ||
457 | ---- | |
458 | mds standby replay = true | |
459 | ---- | |
460 | ||
461 | in the ceph.conf respective MDS section. With this enabled, this specific MDS | |
462 | will always poll the active one, so that it can take over faster as it is in a | |
463 | `warm' state. But naturally, the active polling will cause some additional | |
464 | performance impact on your system and active `MDS`. | |
465 | ||
466 | Multiple Active MDS | |
467 | ^^^^^^^^^^^^^^^^^^^ | |
468 | ||
469 | Since Luminous (12.2.x) you can also have multiple active metadata servers | |
470 | running, but this is normally only useful for a high count on parallel clients, | |
471 | as else the `MDS` seldom is the bottleneck. If you want to set this up please | |
472 | refer to the ceph documentation. footnote:[Configuring multiple active MDS | |
473 | daemons http://docs.ceph.com/docs/mimic/cephfs/multimds/] | |
474 | ||
475 | [[pveceph_fs_create]] | |
476 | Create a CephFS | |
477 | ~~~~~~~~~~~~~~~ | |
478 | ||
479 | With {pve}'s CephFS integration into you can create a CephFS easily over the | |
480 | Web GUI, the CLI or an external API interface. Some prerequisites are required | |
481 | for this to work: | |
482 | ||
483 | .Prerequisites for a successful CephFS setup: | |
484 | - xref:pve_ceph_install[Install Ceph packages], if this was already done some | |
485 | time ago you might want to rerun it on an up to date system to ensure that | |
486 | also all CephFS related packages get installed. | |
487 | - xref:pve_ceph_monitors[Setup Monitors] | |
488 | - xref:pve_ceph_monitors[Setup your OSDs] | |
489 | - xref:pveceph_fs_mds[Setup at least one MDS] | |
490 | ||
491 | After this got all checked and done you can simply create a CephFS through | |
492 | either the Web GUI's `Node -> CephFS` panel or the command line tool `pveceph`, | |
493 | for example with: | |
494 | ||
495 | ---- | |
496 | pveceph fs create --pg_num 128 --add-storage | |
497 | ---- | |
498 | ||
499 | This creates a CephFS named `'cephfs'' using a pool for its data named | |
500 | `'cephfs_data'' with `128` placement groups and a pool for its metadata named | |
501 | `'cephfs_metadata'' with one quarter of the data pools placement groups (`32`). | |
502 | Check the xref:pve_ceph_pools[{pve} managed Ceph pool chapter] or visit the | |
503 | Ceph documentation for more information regarding a fitting placement group | |
504 | number (`pg_num`) for your setup footnote:[Ceph Placement Groups | |
505 | http://docs.ceph.com/docs/mimic/rados/operations/placement-groups/]. | |
506 | Additionally, the `'--add-storage'' parameter will add the CephFS to the {pve} | |
507 | storage configuration after it was created successfully. | |
508 | ||
509 | Destroy CephFS | |
510 | ~~~~~~~~~~~~~~ | |
511 | ||
fa9b4ee1 | 512 | WARNING: Destroying a CephFS will render all its data unusable, this cannot be |
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513 | undone! |
514 | ||
515 | If you really want to destroy an existing CephFS you first need to stop, or | |
516 | destroy, all metadata server (`M̀DS`). You can destroy them either over the Web | |
517 | GUI or the command line interface, with: | |
518 | ||
519 | ---- | |
520 | pveceph mds destroy NAME | |
521 | ---- | |
522 | on each {pve} node hosting a MDS daemon. | |
523 | ||
524 | Then, you can remove (destroy) CephFS by issuing a: | |
525 | ||
526 | ---- | |
de2f8225 | 527 | ceph fs rm NAME --yes-i-really-mean-it |
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528 | ---- |
529 | on a single node hosting Ceph. After this you may want to remove the created | |
530 | data and metadata pools, this can be done either over the Web GUI or the CLI | |
531 | with: | |
532 | ||
533 | ---- | |
534 | pveceph pool destroy NAME | |
535 | ---- | |
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536 | |
537 | ifdef::manvolnum[] | |
538 | include::pve-copyright.adoc[] | |
539 | endif::manvolnum[] |