Clear off swap

Today I have an issue where my swap is almost full. To check your swap usage:

$ free -m

                    total       used       free     shared    buffers     cached

Mem:          1024        157        866          0         11         48

-/+ buffers/cache:         97        926

Swap:          127         95         32

where -m is for the value to be listed in megabytes.

To clear the swap off, please use below commands (please run as root, or sudo):

# sync && /sbin/sysctl vm.drop_caches=3 && swapoff -a && swapon -a 

where sync is to force changed blocks to disk and update the super block; sysctl vm.drop_caches=3 is to free pagecache, dentries and inodes; swapoff is to turn off swap and swapon is to turn swap back on, obviously :)

p.s. Thanks to linuxnetadmin and linuxinsight for the tips.

And you will get free swap after that:

$ free -m

                    total       used       free     shared    buffers     cached

Mem:          1024        157        866          0         11         48

-/+ buffers/cache:         97        926

Swap:          127         0         127
 

That's all folks.

ldapvi - ldap client using text editor

Today I stumbled upon a good tool in managing ldap, which is ldapvi. The reason this tool champs over my previous ldap management tool, which is phpldapadmin, is, it is based on text editor, and can be used in terminal ~ cool :)

To install this tool, all you need is to use your package manager, in my case, yum:

$ sudo yum install ldapvi

Once you have finished installing, launch it with your username and ldap server:

$ sudo ldapvi --user cn=admin,ou=people,dc=local,dc=lan  --host ldap.local.lan

For first time use, you need to set your preferred text editor. Once logged in, you can change the ldap record as if you are working on a very long text file. Once you are done, save like how you normally save a text file, ldapvi will ask for confirmation, and you are done.