how to restart/clear memcache without restarting the whole web server?
Solution 1:
yes. you can clear the memcache. try:
telnet localhost 11211
flush_all
quit
if the memcache does not run on localhost 11211, you will have to adjust it.
Solution 2:
This will also work using netcat
echo "flush_all" | nc -q 2 localhost 11211
Then just wait for the "OK".
Solution 3:
memcflush in the memcache tools is what you want:
memcflush --servers=localhost:11211
Change localhost to whatever your server is.
The memcache tools may not be installed on the server, if you're running a Debian-based OS you can install it like this:
sudo apt-get install libmemcached-tools
Solution 4:
In Bash you may use this fancy syntax:
echo flush_all > /dev/tcp/localhost/11211
Otherwise use memflush command:
memflush --servers=localhost
Solution 5:
Rather than waiting for timeouts you can make the command instantaneous by following flush_all with the quit command:
printf "flush_all\r\nquit\r\n" | nc localhost 11211
Alternatively if you don't have nc:
printf "flush_all\r\nquit\r\n" > /dev/tcp/127.0.0.1/11211
Though this method won't produce an output, although you can verify it works by checking stats to see that cmd_flush increased.