CentOS7清理yum緩存和釋放內存方法

 

清理yum緩存

清理yum緩存使用yum clean 命令，yum clean 的參數有headers, packages, metadata, dbcache, plugins, expire-cache, rpmdb, all

yum clean headers  #清理/var/cache/yum的headers yum clean packages #清理/var/cache/yum下的軟件包 yum clean metadata ...

Linux釋放內存

釋放網頁緩存(To free pagecache):

sync; echo 1 > /proc/sys/vm/drop_caches

釋放目錄項和索引(To free dentries and inodes):

sync; echo 2 > /proc/sys/vm/drop_caches

釋放網頁緩存，目錄項和索引（To free pagecache, dentries and inodes）:

sync; echo 3 > /proc/sys/vm/drop_caches

下面是我實際的數據。

[root@localhost ~]# free -m #查看內存 total used free shared buff/cache available Mem: 481 224 120 1 136 202 Swap: 1023 283 740 [root@localhost ~]# sync; echo 3 > /proc/sys/vm/drop_caches [root@localhost ~]# free -m #從120到186，釋放了66m的內存 total used free shared buff/cache available Mem: 481 209 186 1 85 222 Swap: 1023 283 740