varnish: create special tmp directory for syntax validation

CHANGELOG.md

@@ -15,6 +15,7 @@ The **patch** part changes is incremented if multiple releases happen the same m
 * evolinux-base: replace regular kernel by cloud kernel on virtual servers
 * nagios-nrpe: check_haproxy_stats supports DRAIN status
 * lxc-php: set php-fpm umask to 007
+* varnish: create special tmp directory for syntax validation
 
 ### Changed
 

varnish/tasks/main.yml

@@ -151,4 +151,15 @@
     - config
     - update-config
 
+# To validate the configuration, we must use a tmp directory that is mounted as exec
+# We usually use /vat/tmp-cache then validate the syntax with this command:
+# sudo -u vcache TMPDIR=/var/tmp-vcache varnishd -Cf /etc/varnish/default.vcl > /dev/null
+- name: Special tmp directory
+  file:
+    path: "{{ varnish_tmp_dir }}"
+    state: directory
+    owner: vcache
+    group: varnish
+    mode: "0750"
+
 - include: munin.yml