Hi there,
On 13.07.11 08:28, "Lukas Kahwe Smith" <[email protected]> wrote: >Hi, > >If we ever have to restart our setup from scratch because of some big >crash or because we are rolling out a new version of the site, I am >wondering how to most efficiently warm all the varnish servers. Do I just >warm one server and then rsync? Searching for "varnish cache warm" and >didnt find anything very detailed. > >This link seems useful in the general context of cache warming scripts: >https://www.varnish-cache.org/trac/wiki/VCLExampleHashAlwaysMiss Since I know which url's I need to cache, I'm using a script based on the example above. Basically I'm running all the time against varnish and compare the Max-Age header and the Age header. If Max-Age - Age less than 600 seconds, my script fires a second request against varnish with the preconfigured special X- header. Therefor I always have a warm cache. However, this only works since I can ask my application "hej, gimme a list of url's we want to cache". And additionally I mess up my cache hit / miss ratio since my script will very often generate cache hits. HTH, Marian Example: cat $TEMP_FILE | while read _url; do for i in "$HEADER_1" "$HEADER_2"; do HEADER_CACHE=$(wget -O /dev/null -S --header "$i" --header "Host:xxxxxx" "http://localhost/${_url}"; 2>&1) MAX_AGE=$(echo "${HEADER_CACHE}"|awk -F\= '/max-age/{print $2}') AGE=$(echo "${HEADER_CACHE}"|awk -F\ '/Age/{print $2}') AGE_DIFF=$(($MAX_AGE-$AGE)) [ ! -z $DEBUG ] && echo $_url $MAX_AGE $AGE $AGE_DIFF [ $AGE -eq 0 ] || [ $AGE_DIFF -le $TIME_AFTER ] && \ ( [ ! -z $DEBUG ] && echo -e $RED "^ cache is being updated" $END wget -O /dev/null -S --header "${MAGIC}" --header "$i" --header "Host:xxxxx" "http://localhost/${_url}"; 2>/dev/nulli ) done Done _______________________________________________ varnish-misc mailing list [email protected] https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
