My first post at Medium.com

Today I write my first post at Medium.com. I realize that I have an account at this blogging platform for a long time when I was searching some topics ( I forgot the keywords ;P). Here is my medium blog siryanto.medium.com. So, now I have two blogs, this blog, and the medium blog 😌

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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.

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

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

Catatan

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