List file / directory and show the size

Easy way to list file and sub directory within a directory and show the size, we can use du command combined with ls command.

For example, in above screenshoot we know that there are 3 sub directories and 1 file under /var/www.

du command will show estimate disk space usage in current directory. Above screenshoot show that the size of /var/www is 5,4 GB. Option -s (summarize) will display only a total for each argument, -h will print the result in human readable format (5,4G instead of 5559480).

Now, we combine two commands (du and ls):

Now, we know that the size of temp subdir is 5,3G

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Change eth0 to another name

To rename network interface name (e.g. eth0) as another name (e.g. lan0), edit file called 70-persistent-net.rules. And, will be look like this: Change NAME="eth0" to "lan0", and then reboot your server.

Shrink LVM without data loss

assume we have 3 logical volume: lv1 40GB, lv2 8GB, lv3 200GB in volume group called data . we want to resize lv3 become 180GB. here is the steps: booting to single mode enter init 1 (type: init 1) umount logical volume that you want to resize, e.g. umount /dev/data/lv3 check the filesystem: e2fsck -f /dev/data/lv3 resize the filesystem: resize2fs -p /dev/data/lv3 180G lvreduce -L -20G /dev/data/lv3 Ref: askubuntu.com

Mikrotik Bruteforce Login Prevention

Reference: WIKI FTP Bruteforce prevention This configuration allows only 10 FTP login incorrect answer per minutes add chain=input protocol=tcp dst-port=21 src-address-list=ftp_blacklist action=drop comment="drop ftp brute forcers" add chain=output action=accept protocol=tcp content="530 Login incorrect" dst-limit=1/1m,9,dst-address/1m add chain=output action=add-dst-to-address-list protocol=tcp content="530 Login incorrect" address-list=ftp_blacklist address-list-timeout=3h SSH Bruteforce prevention This will prevent SSH bruteforcer to be banned for 10 days after repetitive attemps add chain=input protocol=tcp dst-port=22 src-address-list=ssh_blacklist action=drop comment="drop ssh brute forcers" disabled=no add chain=input protocol=tcp dst-port=22 connection-state=new src-address-list=ssh_stage3 action=add-src-to-address-list address-list=ssh_blacklist address-list-timeout=10d comment="" disabled=no add chain=input...

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