[jira] [Assigned] (TS-1734) VMap functionality is missing a the vmap_config tool for bringing ip addresses up and down; but appears to be largely dead code

["Igor Galić (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TS-1734?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Igor Galić reassigned TS-1734:
------------------------------

    Assignee: Igor Galić  (was: Leif Hedstrom)
    
> VMap functionality is missing a the vmap_config tool for bringing ip addresses up and down; but appears to be largely dead code
> -------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: TS-1734
>                 URL: https://issues.apache.org/jira/browse/TS-1734
>             Project: Traffic Server
>          Issue Type: Bug
>          Components: Management
>    Affects Versions: 3.3.4, 3.3.0, 3.2.4
>            Reporter: John Kew
>            Assignee: Igor Galić
>             Fix For: 3.3.1
>
>         Attachments: remove_vip_rebalance.patch
>
>
> Virtual IPs were once managed such that within a cluster they
> would automatically rebalance themselves between nodes by bringing
> subinterfaces up and down. After ATS was open sourced the original
> setuid tool, vip_config (or traffic_vip_config) was inadvertently
> removed; but the code which depended on this tool was not cleaned
> up.
> Since modern deployments either do not use this tool at all
> (because it was broken for a few years) and modern deployments also
> have some central system for managing cluster state reliably, we
> do not need VMap to implement some scheme for automatically
> rebalancing the ips.
> This patch keeps much of the code for detecting ip address conflicts
> and for receiving the multicast messages from the cluster; but we
> remove all instances where we either bring up/down an interface.
> Deployments should manage this through external state systems.
> Note: VIPs do not actually bind to the specific addresses in
> vaddrs; this is just an operations convience to ensure that a
> cluster has no ip conflicts or unmanaged vips. This feature becomes
> even less useful. LocalManager.cc would have to be modified in some
> way to set this up properly.
> Note: The *right* thing to do here may be to recall that old tool and let
> VMap do it's thing.
> Note: Another *right* thing to do may be to remove VMap entirely, along
> with the associated cluster messages. At least with this exiting changeset
> we can detect ip address conflicts.

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