Rewrite the etcd doc to be about upgrading etcd. #2767

mml · 2017-03-10T23:27:46Z

First draft, nearly verbatim copy. Please rip to shreds.

This change is

wojtek-t · 2017-03-13T07:13:17Z

Just some minor comments.

wojtek-t · 2017-03-15T13:48:03Z

@mml ping

mml · 2017-03-15T20:15:09Z

@wojtek-t I don't see any comments from you.

wojtek-t · 2017-03-13T07:10:50Z

docs/admin/etcd.md

+
+* This is a custom tool, which means it doesn’t have any guarantees and only
+  best-effort support from etcd team (though they fixed some bugs that we found
+  in the meantime).


It would be useful to link to this script here.

wojtek-t · 2017-03-13T07:11:16Z

docs/admin/etcd.md

-## Default configuration
+Going forward, the docker image for etcd in version X will contain multiple
+versions of etcd. For example 3.0.14 image will contain all: 2.2.1, 2.3.7 and
+3.0.14 binaries of etcd and etcdctl. This will allow running etcd in multiple


s/3.0.14/3.0.17/

everywhere

wojtek-t · 2017-03-13T07:12:44Z

docs/admin/etcd.md


-## Configuration: high-level goals


I think we should leave this section - it seems useful.

Done. I made it a subsection of "About etcd" and renamed it.

wojtek-t · 2017-03-15T20:21:35Z

Sorry - seems I forgot to click submit.

xiang90 · 2017-03-15T22:04:39Z

docs/admin/etcd.md

+
+This document describes how to do this migration.
+
+### Etcd upgrade limitations


etcd upgrade limitations. (do not use Etcd, we prefer etcd :P)

Done :-). But I will defer to whatever our style guide is about capitalizing words like etcd when they start a heading or sentence.

Where is the rule about capitalizing words in the style guide? I cannot find it here: https://kubernetes.io/docs/contribute/style-guide/#documentation-formatting-standards.

xiang90 · 2017-03-15T22:14:00Z

docs/admin/etcd.md

+
+### Etcd upgrade limitations
+
+The way etcd was designed introduces some significant limitations on how the


i do not think this is a design issue to be honest. we have done quite some internal work to allow removing these limitations from very beginning. we just do not know the scope of the use case and the effort. We should resolve it here:

etcd-io/etcd#7308

Would you prefer a different phrasing? Regardless of why, the limitations are there.

xiang90 · 2017-03-15T22:14:22Z

docs/admin/etcd.md

+
+#### No rollback
+
+Etcd doesn’t support rollback procedure at all (by design). That means, that if


use etcd instead of Etcd?

xiang90 · 2017-03-15T22:17:39Z

This doc looks good to me in general.

etcd team is OK to support rollback once etcd-io/etcd#7308 is resolved.

xiang90 · 2017-03-15T22:22:05Z

docs/admin/etcd.md

+This is a very huge limitation - we really need a rollback procedure if we face
+some problems with the new release.
+
+To make things better, we were provided a custom rollback tool by CoreOS (etcd


to be clear, this is a offline data rollback tool with very limited scope. it probably only works for v2 to v3 upgrades for k8s.

ravilr · 2017-03-16T06:59:31Z

@mml @wojtek-t can we also add some notes around how to deal with running pods in the cluster. I understand that the etcd migration is offline, during which kube-apiserver won't be able to talk to etcd. What happens to the already running pods in the cluster. Would the node controller evict nodes/pods due to lack of heartbeats as soon as the etcd is available but before the nodes starts heartbeating again. How to avoid affecting running pods in the cluster during this migration.

ravilr · 2017-03-16T07:04:32Z

docs/admin/etcd.md

 [etcd](https://coreos.com/etcd/docs/latest/) is a highly-available key value
 store which Kubernetes uses for persistent storage of all of its REST API
-objects.
+objects.  For the mechanics behind how kubernetes builds, distributes and
+deploys Kubernetes, see _some doc_.


did you mean 'how kubernetes builds,.. deploys etcd'

Heh, fixed.

justinsb · 2017-03-20T03:32:15Z

docs/admin/etcd.md

+patch releases you can switch versions at any time back and forth). That
+basically means, that we cannot upgrade directly e.g. from 2.1.x to 2.3.x.
+
+Fortunately, this limitation it is easy to workaround - it is enough to start a


I think no comma after Fortunately, and s/it is/is/g

The comma belongs, but I'll defer to a "doc review" at some point.

See "sentence adverbs" at http://theeditorsblog.net/2016/02/21/a-tale-of-adverbs-and-the-comma/

I fixed the "it is".

justinsb · 2017-03-20T03:33:33Z

docs/admin/etcd.md

+you migrate your cluster e.g. from 2.2.x to 2.3.y, there is no way to get back
+to 2.2.x (other than restoring from backup data from the moment when 2.2.x was
+running, though if we were running 2.3.y for some time, we will lose all data
+that were written in the meantime).


may be gramatically less controversial to say "all data written in the meantime"

justinsb · 2017-03-20T03:34:16Z

docs/admin/etcd.md

+running, though if we were running 2.3.y for some time, we will lose all data
+that were written in the meantime).
+
+This is a very huge limitation - we really need a rollback procedure if we face


"very huge" is apt but perhaps not the bestest wording

changed to "significant"

justinsb · 2017-03-20T03:38:30Z

docs/admin/etcd.md

-This path can be prefixed by using the [kube-apiserver](/docs/admin/kube-apiserver) flag
-`--etcd-prefix="/foo"`.
+1. Detect which version of etcd we were previously running.
+   For that purpose, we have added a dedicated (metadata) file that will be


This file is version.txt I believe - should we specify that? (I don't have a strong opinion either way...)

Done. I also tidied up the tense there to be more consistent, but I think it's still all over the map across the doc.

justinsb · 2017-03-20T03:40:42Z

docs/admin/etcd.md

+   The important thing here is that those etcd will not list on the default etcd
+   port.  They are hardcoded to listen on ports which the apiserver is not
+   configured to connect to, which means that apiserver won’t be able to connect
+   to those etcd's and no new data will be written in the meantime.


Although it does remain part of the etcd cluster, because we don't change the peer port, I believe, so new data will be written. Should we clarify the "no new data" statement? (And is this actually safe?)

I actually opened an issue about this before I knew about this doc: kubernetes/kubernetes#43364

We are relying on the fact that the port we run on is obscure and "shouldn't" be exposed the way most masters are configured. We should clarify that a bit.

If by safe, we mean we guarantee no one will try to write to it during this transition, then strictly speaking no.

justinsb · 2017-03-20T03:44:07Z

docs/admin/etcd.md

+1. Run the migration script
+   If the previously run version is already in the desired version, this will be
+   no-op.
+1. Start etcd (in the desired version)


I think we should link to the salt manifest, and probably make this more explicit

i.e.

Change "/usr/local/bin/etcd ..." to be
"if [ -e /usr/local/bin/migrate-if-needed.sh ]; then /usr/local/bin/migrate-if-needed.sh 1>>/var/log/etcd.log 2>&1; fi; /usr/local/bin/etcd..."

Where exactly are you suggesting I link to? (i.e. Can you paste a URL?)

I was suggesting to link to https://github.com/kubernetes/kubernetes/blob/master/cluster/saltbase/salt/etcd/etcd.manifest, as it may be easier to point to an example rather than saying it in words.

justinsb · 2017-03-20T03:47:27Z

docs/admin/etcd.md

-```shell
-curl -fs -X PUT "http://${host}:${port}/v2/keys/_test"
-```
+1. Run the migration script


We also need:

Specify the image as 3.0.17

Specify these env vars for upgrade:

TARGET_STORAGE=etcd3 TARGET_VERSION=3.0.17 DATA_DIRECTORY=???

Specify these env vars for downgrade (and clarify that the image should still be 3.0.17, as I made that mistake before engaging brain):

TARGET_STORAGE=etcd2 TARGET_VERSION=2.2.1 DATA_DIRECTORY=???

We also do specify this flag for etcd3 in salt; not sure if it matters: --quota-backend-bytes=4294967296

from kubernetes/kubernetes#43366 (comment):

[downgrading is] supported assuming that:

you are still using 'json' as the storage data format (even though the default is protobuf in 1.6)

you're not downgrading back to 2.2.1 image, but just using "3.0.17" image and setting ETCD_VERSION to 2.2.1

Documentation needs to make it crystal clear that you have to explicitly set --storage-media-type=application/json if you want to have the option to downgrade from etcd3 to etcd2.

It also needs to explain the "use the 3.0.17 image but run in 2.2.1 mode"... I'm not seeing that mentioned in this doc.

Clarified this, I think. PTAL.

I'd like to rearrange the doc so that the reader can get the recipe first and read the gory details about implementation later, if they wish. Next revision, tho.

justinsb · 2017-03-20T04:08:42Z

Great document - thank you!

Q: Is there any reason to stick with the 2.2.1 image? My understanding is that the 3.0.17 image will still run etcd 2.2.1 if TARGET_STORAGE=="etcd2". Sticking with one image would mean we wouldn't need to remember whether we were "etcd2 on a downgrade" or "etcd2 always", which would be great...

justinsb · 2017-03-20T04:24:44Z

We should also document that mixing versions of etcd-main and etcd-events does not work (unless there's some magic syntax for etcd-servers-overrides)

liggitt · 2017-03-20T16:38:28Z

docs/admin/etcd.md

+  in the meantime).
+
+* The rollback can be done only from 3.0.x version (that is using v3 API) to
+  2.2.1 version (that is using v2 API).


is this accurate? is that what @wojtek-t meant at kubernetes/kubernetes#43366 (comment):

you're not downgrading back to 2.2.1 image, but just using "3.0.17" image and setting ETCD_VERSION to 2.2.1

and only if all apiservers started against the etcd3 server ran with --storage-media-type=application/json, right?

This is accurate, yes. What @wojtek-t meant by that comment was that we don't need to change images. The 3.0.17 image also contains the 2.2.1 binaries (and 2.3.7 and the rollback tool!).

ethernetdan · 2017-03-21T00:33:07Z

Has the feedback here been implemented? I'd like to close the issue kubernetes/kubernetes#43366

hongchaodeng

@mml

I think the docs is way too subjective -- mentioning words like "significant limitations on etcd". This breaks the spirit of open source community and not healthy for the project in long term. etcd team have been writing the tool and fixing all issues in fast responsive manner, despite all of this being none of etcd or company's work.

Thus, please correct some wording.

Last but not least, please mention the most important point for users: A good design of etcd cluster deployment should include: 1. have 3 or 5 members for HA; 2. have backup periodically. HA cluster is safe enough. If entire cluster went down, users need to do disaster recovery from backup.

hongchaodeng · 2017-03-21T05:21:50Z

docs/admin/etcd.md

+
+### etcd upgrade limitations
+
+The way etcd was designed introduces some significant limitations on how the


The way etcd was designed introduces some significant limitations on how the upgrade can be done. These are the main limitations.

I disagree with the wording here. It sounds more like complaints than clarifying the limits to users.

Maybe rephrase like:

There are some limits in etcd upgrade process.

hongchaodeng · 2017-03-21T05:24:38Z

docs/admin/etcd.md

+
+#### One minor release at a time
+
+It is possible to upgrade only by one minor release at a time (though, within


To emphasize and point out the upgrade path more explicitly, rephrase:

Upgrade only one minor release at a time. That means we cannot upgrade directly e.g. from 2.1.x to 2.3.x . Within patch releases, versions can be switched back and forth.

hongchaodeng · 2017-03-21T05:25:30Z

docs/admin/etcd.md

+patch releases you can switch versions at any time back and forth). That
+basically means, that we cannot upgrade directly e.g. from 2.1.x to 2.3.x.
+
+Fortunately, this limitation is easy to workaround - it is enough to start a


Fortunately, ~~this limitation is easy to workaround~~

hongchaodeng · 2017-03-21T05:25:42Z

docs/admin/etcd.md

+cluster for any intermediate minor release, wait until it is healthy and
+functional and stop it then. This will do the migration itself underneath.
+
+As an example: to upgrade from 2.1.x to 2.3.y version, it is enough to start


Combine this with above paragraph.

hongchaodeng · 2017-03-21T05:26:44Z

docs/admin/etcd.md

+
+#### Rollback via special tool
+
+etcd versions through 3.0 don’t support general rollback. That is, in general


etcd versions ~~through 3.0~~ 3.0+

hongchaodeng · 2017-03-21T05:27:30Z

docs/admin/etcd.md

+etcd versions through 3.0 don’t support general rollback. That is, in general
+after migrating from M.N to M.N+1, there is no way to go back to M.N.
+
+This is a significant limitation - we really need a rollback procedure if we


Remove this paragraph. What can users get from reading this paragraph?

hongchaodeng · 2017-03-21T05:28:21Z

docs/admin/etcd.md

+This is a significant limitation - we really need a rollback procedure if we
+face some problems with the new release.
+
+To make things better, CoreOS has provided a


For the sake of open source spirit:

CoreOS -> etcd

hongchaodeng · 2017-03-21T05:35:27Z

docs/admin/etcd.md

-To test whether `etcd` is running correctly, you can try writing a value to a
-test key. On your master VM (or somewhere with firewalls configured such that
-you can talk to your cluster's etcd), try:
+This section describes how we are going to do the migration given all the


~~given all the limitations we have~~ given above conditions.

wojtek-t · 2017-03-21T07:54:29Z

docs/admin/etcd.md

+   no-op.
+1. Start etcd (in the desired version)
+
+Starting in 1.6, this has been done in the manifests for new GCE clusters.  You


Should this be put in the top?
@liggitt for input.

wojtek-t · 2017-03-21T07:55:30Z

Has the feedback here been implemented? I'd like to close the issue kubernetes/kubernetes#43366

@ethernetdan - the modification to the doc, yes. Though there was also request to explicitly mention it in release note, and i think it's not yet done.

jaredbhatti · 2017-03-21T17:21:15Z

This appears to be a 1.6 release-bound item. It's not in the tracking sheet (https://docs.google.com/spreadsheets/d/1nspIeRVNjAQHRslHQD1-6gPv99OcYZLMezrBe3Pfhhg/edit#gid=0) nor is it targeted against the 1.6 brach. Can you please fix these two issues?

mml · 2017-03-22T21:38:43Z

@calebamiles #2898 is not targeted for 1.6, so in the interim the current doc will disappear. Is that cool?

wojtek-t

I just have two minor comments.

wojtek-t · 2017-03-23T14:25:58Z

docs/admin/etcd.md

+#### One minor release at a time
+
+Upgrade only one minor release at a time, e.g. we cannot upgrade directly from 2.1.x to 2.3.x.
+Within patch releases it is possible to upgrade and downgrade between arbitrary versions.It is fairly 


I'm not native speaker, but for me something is missing before "It is fairly easy...". I'm missing some context for this, sth like:
"Fortunately, just starting a cluster for any intermediate minor release, waiting until it is healthy and functional and then shutting it down is itself performing the migration."

WDYT?

wojtek-t · 2017-03-23T14:34:03Z

docs/admin/etcd.md

+* The rollback can be done only from 3.0.x version (that is using v3 API) to
+  2.2.1 version (that is using v2 API).
+
+* The tool only works if the data is still stored in `application/json` format.


Make it bold?

This is now called out as a warning per @steveperry-53's style guidance.

wojtek-t · 2017-03-23T19:48:18Z

LGTM - but I guess we also need LGTM signal from tech writer.
@devin-donnelly ?

wojtek-t · 2017-03-23T19:48:40Z

Also - please squash commits.

xiang90 · 2017-03-23T19:52:20Z

docs/admin/etcd.md

@@ -1,49 +1,196 @@
 ---


@mml @wojtek-t can we change the name of the md file to etcd_upgrade.md to match the title?

I am going to revive the original generic etcd doc soon, which should be named as etcd.md.

I'm not good at naming - I'm fine with that, but will leave that decision to others.

I'll add the original etcd.md to this PR @xiang90 and I can make some small changes to update that doc if you'd like. Is that ok with you @devin-donnelly

chenopis · 2017-03-23T21:59:33Z

docs/admin/etcd.md

 [etcd](https://coreos.com/etcd/docs/latest/) is a highly-available key value
 store which Kubernetes uses for persistent storage of all of its REST API
-objects.
+objects.  For the mechanics behind how kubernetes builds, distributes and
+deploys etcd, see _some doc_.


Is some doc just a placeholder for a link? If so, this needs to put in before we can Docs LGTM.

It is a placeholder. I'll just take the sentence out until some doc is ready. I do not want to hold up this PR any further.

steveperry-53 · 2017-03-24T00:23:04Z

@mml, @wojtek-t, See cb07168 for suggested edits.

steveperry-53 · 2017-03-24T00:37:23Z

docs/admin/etcd_upgrade.md

+rollback might require restarting all Kubernetes components on all nodes.
+
+_To verify: It seems that both Kubelet and KubeProxy are using “resource
+version” only for watching (i.e. are not using resource versions for anything


Is this text under "To verify" meant to be in the document? It almost looks like a review comment.

Good call. I will rephrase that.

mml · 2017-03-24T20:53:21Z

@steveperry-53 edits mostly look good, but some of the seemingly excessive bolding is because there are some mistakes users can make here that could cut off their option for rollback or that would lead them into waters where we have not tested. These are charted waters, but the chart is not the territory.

So I guess the question is one of doc style. How do we warn users about something risky and important? This is like those sidebars usually indicated by something like (!) in "for dummies" books.

Thanks!

steveperry-53 · 2017-03-24T21:10:50Z

@mml, If you feel it's important, go ahead and return some important statements to bold. Usually what we do, instead of bold, is to separate important material as a Note or Warning. We bold the word Note or Warning but not the text. Here is an example. I'll leave the choice up to you. I don't need to review this again.

mml · 2017-03-24T21:22:02Z

@steveperry-53 Thanks, I'll try to restructure things to follow that style. I am re-labeling do-not-merge until I finish those changes and squash.

mml · 2017-03-24T21:47:33Z

We are ready to go.

steveperry-53 · 2017-03-24T21:55:08Z

@mml, Would you like me to merge this now?

mml · 2017-03-24T22:06:18Z

@steveperry-53 yes, pleas.

jagosan · 2017-04-19T20:30:42Z

docs/admin/etcd_upgrade.md

+
+### New etcd Docker image
+
+We decided to completely change the the content of the etcd image and the way it works.


typo: "the the"

mml assigned wojtek-t Mar 10, 2017

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Document etcd v2->v3 migration procedure kubernetes/kubernetes#41054

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kube-apiserver does not recover after etcd3 -> etcd2 downgrade kubernetes/kubernetes#43366

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etcd2 -> 3 upgrade: do we need to go read-only for multi-master? kubernetes/kubernetes#43364

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Add a doc to about upgrading etcd.

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#2767 patch: fix typo in etcd-upgrade.md #3478

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		This document describes how to do this migration.

		### Etcd upgrade limitations


		#### No rollback

		Etcd doesn’t support rollback procedure at all (by design). That means, that if


		#### One minor release at a time

		It is possible to upgrade only by one minor release at a time (though, within


		#### Rollback via special tool

		etcd versions through 3.0 don’t support general rollback. That is, in general


		### New etcd Docker image

		We decided to completely change the the content of the etcd image and the way it works.

Rewrite the etcd doc to be about upgrading etcd. #2767

Rewrite the etcd doc to be about upgrading etcd. #2767

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