How to reload varnish configuration without a complete restart that would clear all cache.
Actual step :
1) Use varnishadm to load new configuration to memory (with an alias)
2) Use varnishadm to use this new configuration
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https://ma.ttias.be/reload-varnish-vcl-without-losing-cache-data/Je dois me plonger dans varnish pour améliorer une conf existante. Format de configuration... original
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https://varnish-cache.org/docs/4.0/users-guide/vcl-built-in-subs.html#vcl-hash