Rework haproxy config for stickiness and balance strategy #179
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vuntz
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Feb 8, 2017
vuntz
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- We enable stickiness based on SSL sessions
- We add the ability to do stickiness based on cookies
- We allow to define the balance strategy on a per-resource basis
- We stop overriding the default balance strategy (and therefore use roundrobin by default)
We have haproxy 1.5.x now, so we can use persistence for SSL sessions. This matters as if we want to allow people to not use "source" as balance algorithm, then we need to make sure that sessions keep going to the same backend to avoid breakages. This reverts commit 32323b0.
This is done in the LWRP and in the template; let's just do it in the LWRP to simplify the template.
| @@ -25,6 +25,8 @@ | |||
| attribute :address, kind_of: String, default: "0.0.0.0" | |||
| attribute :port, kind_of: Integer, default: 0 | |||
| attribute :mode, kind_of: String, default: "http", equal_to: ["http", "tcp", "health"] | |||
| attribute :balance, kind_of: String, default: "", equal_to: ["", "roundrobin", "static-rr", "leastconn", "first", "source"] | |||
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This is useful to achieve persistence for web apps which have a session, which is important in order to allow using a different algorithm than "source" for balancing without breaking sessions.
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This allows achieving persistence for a normal session, but also for the login form where there's usually a CSRF token (and which is not associated to a real session in the web app).
This enables customization of the balance strategy for each service.
The default in the haproxy cookbook is roundrobin, and this should actually work fine. In cases where this may be troublesome (like web apps), we can now configure stickiness to avoid issues. With roundrobin, we spread the load accross the various backends, which results in much improved performance.
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This works fine here. Just need to validate the SSL case, but everything else seems good. |
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So overall, this looks good, except for horizon with ssl: there, the browser is creating multiple connections, so the ssl session id affinity doesn't work as expected. Easy workaround is to use the source balance strategy in that case. But I'll play a bit more with it. |
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One change has been cherry-picked in #193, do consider reviewing that one. |
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re-running a build on a separate PR to see if ssl is still broken. |
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Given that the tests passed in #208 - including the SSL tests, I am merging this PR. |
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Ah, I cannot merge it in the lack of passing CI. |
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@nicolasbock @dirkmueller could you please transfer your +1 to #208 so we can get this change merged please? |
