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Tidied up the code and moved it under VRRP in view to use
with show-interface (which has VRRP filtering)
No change in functionality
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convert all call to jinja to use template.render
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os.system does print the ouput of the command, run() does not.
A new function called call() does the printing and return the error code.
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Note: if transition-scripts configured for both vrrp instance and sync group, which are it a member of, both scripts will be executed.
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In old implementation, all notify scripts are configured directly inside a keepalived.conf. This way is not recommended even by keepalived as scripts execution is not tracked and they may be running not in order and killed before the actual work will be finished. We have observed such situations in very rare cases during tests.
New implementation use FIFO pipe, to which keepalived send any state changes. And these notifications are read by a daemon, saved in a queue and processed one by one, which eliminates the situation when the scripts creating inconsistent config or environment.
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transaction-script 'stop'
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It is possible to add a nonexistent interface to the VRRP configuration, but this will lead to keepalived error and stop after configuration reload.
With this new parameter, keepalived will consider nonexistent interfaces as FAULT instead crash and start VRRP on them, when they will appear on the system, which is a feature and much more correct behavior.
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in unicast mode (patch by Johan Fredin).
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- adding vmac_xmit_base to keepalived.conf when use_vmac is being used
otherwise both nodes will become master
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Watcher7).
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Since it does not understand escaped quotes inside notify_* options,
until we fix that, we have to put the script and its arguments
in positional arguments and join inside the transition script runner.
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