Currently, we have 4 VM (Virtual Machine) that used for building kubernetes cluster and also for testing applications.

There are detail about our VM use until now :
1. Node1 (rafli) 10.30.1.212
2. Node2 (rafli) 10.30.1.213
3. Node3 (ari) 10.30.1.214
4. Node4 (bagus) 10.30.1.221

Recently there has been a problem with storage where the storage is being fully used.

Here are the solutions to fix the problems:

**1. Check subdirectory storage used**
We can check how many storage used for every subdirectories by used this command below :

sudo du -sh *

Also use grep to filter the output that we need, in the image i used G for filtering Gigabyte size storage use only

**2. Configure and delete syslog**
Syslog take too much storage in VM, we can flush/erase the log with the command:

# > /var/log/syslog

Configure the syslog that is to use only 1 GB storage

$ sudo nano /etc/logrotate.d/rsyslog

/var/log/syslog
/var/log/mail.info
/var/log/mail.warn
/var/log/mail.err
/var/log/mail.log
/var/log/daemon.log
/var/log/kern.log
/var/log/auth.log
/var/log/user.log
/var/log/lpr.log
/var/log/cron.log
/var/log/debug
/var/log/messages
{
        rotate 4
        weekly
        maxsize 1G #add this line
        missingok
        notifempty
        compress
        delaycompress
        sharedscripts
        postrotate
                /usr/lib/rsyslog/rsyslog-rotate
        endscript
}

Restart the syslog with systemctl

$ sudo systemctl restart syslog

Also delete the syslog cache that is used .[number] or .gz in the file

$ sudo rm syslog.1
$ sudo rm syslog.2.gz
$ sudo rm syslog.3.gz
$ sudo rm syslog.4.gz

**3. Resize the journalctl size**
Journactl used big storage to save log. Use this command to limit the storage will be used for journalctl.

$ sudo journalctl --vacuum-size=100M

**4. Delete linux modules**
Linux only use 1 module to running the VM. There are many module installed in linux but not use by linux.

Check the module used by linux

$ uname -r

Next, check modules installed in linux

$ dpkg-query --show 'linux-modules-*'

Last, delete the modules that is not used in linux

$ sudo apt remove $(dpkg-query --show 'linux-modules-*' | cut -f1 | grep -v "$(uname -r)") --purge