Linux self-study note--memcache and varnish cache server

1.MEMCACHED:KV structure, stored in memory, can reduce the database access pressure, can also be used as a session server

(1) Common commands

-u Specify user-m specify memory size

-D start|restart|stop-p Specify port, default 11211

-N Minimum allocated space-f growth factor, calculated as the minimum allocation space, default is 1.25 times times

-VV viewing the specific startup process

(2) Connecting memcached

Telnet x.x.x.x 11211

Quit quitting

View Stats Items

Save Set key flags timeout size

Extract Get Key

Append append key Flags timeout content_size content, for example:

Append magedu 0 4. com

Add and subtract INCR/DECR key num

Empty Flush_all

(3) PHP connection

Centos7 php-pecl-memcached

(4) PHP session server

php.ini file

Session.save_handler=memcache

Session.save_path= "Tcp://127.0.0.1:11211?persistent=1 & weight=1 & timeout=1 & Retry_interval=15"

2.varnish: can use memory or hard disk cache, can be used for front-end static page picture JS cache server

(1) Connecting varnish

Varnishadm-s/etc/varnish/secret-t 127.0.0.1:6082

Vcl.list list configuration files, avrilable available, active used

Vcl.show confname View specific configuration files

Vcl.use confname using configuration files

Vcl.load confname filename Loads a file into a configuration file

Backend.list

storage.list Cache Type     

(2) Basic configuration

/etc/varnish/default.vcl

Backend Default {

. host= "x.x.x.x" is the IP of the listening host

. port= "80"

}

/etc/varnish/varnish.params

Varnish_listen_port=80

Varnish_storage= "File,/var/lib/varnish/varnis_storage.bin"

HDD storage, binary files, do not go to cat, files may be corrupted

Varnish_storage= "mallc,2048" Memory storage

(3) Common variables

Bereq: Varnish sending HTTP request to backend host

Bereq.http.HEADERS

Bereq.url

Bereq.proto Protocol version

Bereq.backend

BERESP:

Beresp.status

Beresp.backend.name

Beresp.http.HEADERS

Beresp.ttl Remove response time, remaining TTL lifetime

Req: HTTP request sent by backend to varnish host

Req.method 4.0 Request method

Req.request 3.0 Request Method

Obj:

Obj.hits Hit Count

Obj.ttl object ttl

Server

Server.ip

Server.hostname

(4) Example

Do not let the specified page check the cache

Sub Vcl_recv {

if (req.url ~ "^/test.html$") {

Return (pass)

}

}

Add hit tip to head

Sub Vcl_deliver {

if (obj.hits>0) {

Set resp.http.cache= "hit" + "" +server.ip

}else{

Set resp.http.cache= "Miss" + "" "+server.ip

}

}

Clear Page Cache 3.0

Sub Vcl_hit {

if (req.request = = "PURGE") {

Purge

Error 404 "not in cache";

}

}

Curl-x PURGE Http://magedu/test

Clear Page Cache 4.0

Sub Vcl_recv {

if (Req.method = = "PURGE") {

return (Purage);

}

}

Sub Vcl_purge {

Return (synth, "purged"))

}

curl-x PURGE http://magedu/test

(5) Static and dynamic separation

Backend Server1 {

...

}

Backend Server2 {

...

}

Sub Vcl_recv {

if (req.url ~ "(? i) \.php$") {

Set Req.backend_hint=server1;

}eles{

Set Req.backend_hint=server2;

}

}

(6) Load Balancing

Import directors;

Sub Vcl_init {

New Bar=directors.round_robin ();

Bar.add_backend (Server1);

Bar.add_backend (Server2);

}

Sub Vcl_recv {

Set Req.backend_hint=bar.backend ();

}

Linux self-study note--memcache and varnish cache server