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Rework haproxy config for stickiness and balance strategy #179

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Rework haproxy config for stickiness and balance strategy #179

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Commits on Feb 8, 2017

  1. Revert "Fix SSL setup for haproxy 1.4 release" 

    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.
    @vuntz
    vuntz committed Feb 8, 2017
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  2. haproxy: Do not enforce mode as tcp for ssl twice 

    This is done in the LWRP and in the template; let's just do it in the
LWRP to simplify the template.
    @vuntz
    vuntz committed Feb 8, 2017
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  3. haproxy: Add ability to configure stickiness based on cookies 

    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.
    @vuntz
    vuntz committed Feb 8, 2017
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  4. haproxy: Add ability to do stickiness based on more than one cookie 

    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).
    @vuntz
    vuntz committed Feb 8, 2017
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  5. haproxy: Add balance attribute to haproxy_loadbalancer resource 

    This enables customization of the balance strategy for each service.
    @vuntz
    vuntz committed Feb 8, 2017
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  6. crowbar-pacemaker: Stop changing default haproxy balance strategy 

    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.
    @vuntz
    vuntz committed Feb 8, 2017
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