Squid cache
       The proxy server sets the cache on the local hard disk , This can improve network efficiency
1, modify squid configuration file “/etc/squid/squid.conf”, parameter “cache_dir_ufs” It is used to set the cache directory  
      [root@localhost wj]# gedit /etc/squid/squid.conf
      # Uncomment and adjust the following to add a disk cache directory.
      cache_dir ufs /var/spool/squid 100 16 256    // Cache directory var/spool/squid, size 100M

2, restart squid service  
      [root@localhost wj]# service squid start
       Starting  squid:.                                          [ determine ]
      [root@localhost wj]# gedit /etc/squid/squid.conf
      [root@localhost wj]# service squid restart

       stop it  squid:2018/08/15 11:17:31| WARNING cache_mem is larger than total disk cache space!
      ................                                           [ determine ]
      init_cache_dir /var/spool/squid...  Starting  squid:.       [ determine ]
      [root@localhost wj]# 

3, see squid Cache directory , among swap.state It will increase with the increase of visiting web pages
      [root@localhost wj]# ls -al /var/spool/squid/
       Total dosage  76
      drwxr-x---   18 squid squid 4096 8 month   15 11:18 .
      drwxr-xr-x.  15 root  root  4096 8 month   15 10:50 ..
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 00
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 01
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 02
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 03
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 04
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 05
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 06
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 07
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 08
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 09
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 0A
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 0B
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 0C
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 0D
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 0E
      drwxr-x---  258 squid squid 4096 8 month   15 11:18 0F
      -rw-r-----    1 squid squid   52 8 month   15 11:18 swap.state
      [root@localhost wj]#

4, Clean up cache periodically
       stay squid In the cache directory ,swap.state It's getting bigger , Users need to clear this file regularly , Or you can do a scheduled task to clear .

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