Memcached
General Information
Memcached is a “distributed memory object caching system”. Useful for speeding up web applications by caching database lookups.
Official Site: http://www.memcached.org/
Checklist
- Distro(s): Enterprise Linux
- Repo: EPEL (if using EL 5/6)
Install Memcached
- Memcached is in EL 7's base repo. If you are using EL 5/6, you will need to add the EPEL repo.
- Add the EPEL repo
- Install memcached
yum install memcached
- Start and enable the service
- EL 6
service memcached start chkconfig memcached on
- EL 7
systemctl start memcached systemctl enable memcached
Configure Memcached
- Edit the config file
vim /etc/sysconfig/memcached # Daemon USER="memcached" # Reserved Cache in MBs CACHESIZE="2048" # Memcached Options - Listen on localhost only OPTIONS="-l 127.0.0.1" # Memcached Options - Clear out to listen on any interface #OPTIONS="" # Networking PORT="11211" MAXCONN="1024"
- OPTIONS ⇒ Set other daemon options (see man memcaced)
- If you made any config file changes, restart the service.
Secure Memcached
Memcached does not have any application authentication, so you should configure the memcached server with firewall rules to only allow certain sources to utilize it on tcp and udp port 11211 (the default port).
- Either listen locally, or setup firewall rules to protect the cache.
- See pages on Firewall-cmd or IPTables for syntax details.