Changes in Varnish-Cache 8.0¶
For information about updating your current Varnish deployment to the new version, see Upgrading to Varnish-Cache 8.0.
A more detailed and technical account of changes in Varnish, with links to issues that have been fixed and pull requests that have been merged, may be found in the change log.
varnishd¶
Parameters¶
Read only parameter can no longer be set through an alias.
Deprecated aliases for parameters can no longer be set read only, it should instead be done directly on the parameters they point to.
A new parameter uncacheable_ttl defines the TTL of objects marked as
uncacheable (or hit-for-miss) by the built-in VCL. It is accessible in VCL
as the param.uncacheable_ttl variable.
http_req_overflow_status can now also be set to 500.
Other changes in varnishd¶
Changes to VCL¶
VCL variables¶
Runtime parameters can now be accessed from VCL through:
param.<param_name>. See VCL-VARIABLES(7) for the list of available
parameters.
Other changes to VCL¶
VMODs¶
The VMOD functions std.real2integer(), std.real2time(),
std.time2integer() and std.time2real() have been removed. They had
been marked deprecated since Varnish Cache release 6.2.0 (2019-03-15).
The plug-in replacements for these functions are:
std.real2integer():std.integer(real=std.round(...), fallback=...)
std.real2time():std.time(real=std.round(...), fallback=...)
std.time2integer():std.integer(time=..., fallback=...)
std.time2real():std.real(time=..., fallback=...)
VUTs¶
VUTs now print backtraces to syslog after a crash.
varnishlog¶
XXX changes concerning varnishlog(1) and/or vsl(7)
varnishadm¶
New ban expression variable obj.last_hit allows to remove objects from cache which have not been accessed for a given amount of time. This is particularly useful to get rid of request bans by removing all objects which have not been touched since the request ban.
varnishstat¶
New VSC counters for connection pools:
VCP.ref_hitcounts the number of times an existing connection pool wasfound while creating a backend.
VCP.ref_misscounts the number of times an existing connection pool wasnot found while creating a backend.
varnishtest¶
varnishtest now prints a backtrace to stderr after a crash.