https://github.com/vegandthecity/server/issues/14

etc/default/varnish

@@ -21,6 +21,16 @@ p_a=':6081'
 # https://varnish-cache.org/docs/6.4/reference/varnishd.html
 p_f='/etc/varnish/default.vcl'
 # 2020-04-19 Dmitry Fedyuk https://www.upwork.com/fl/mage2pro
+# 1) «Use the specified storage backend. See Storage Backend section:
+# https://varnish-cache.org/docs/6.4/reference/varnishd.html#storage-backend
+# This option can be used multiple times to specify multiple storage files.
+# Name is referenced in logs, VCL, statistics, etc.
+# If name is not specified, "s0", "s1" and so forth is used.»
+# https://varnish-cache.org/docs/6.4/reference/varnishd.html#tuning-options
+# 1) «`malloc` is a memory based backend.»
+# https://varnish-cache.org/docs/6.4/reference/varnishd.html#storage-backend
+p_s='malloc,256m'
+# 2020-04-19 Dmitry Fedyuk https://www.upwork.com/fl/mage2pro
 # 1) «Offer a management interface on the specified address and port.
 # See `varnish-cli` for documentation of the management commands:
 # https://varnish-cache.org/docs/6.4/reference/varnish-cli.html#varnish-cli-7