Tuesday, July 26, 2016

Update Wordpress Plugins - Could not create directory issue

Put this in wp-config.php


and change wp-content folder to 777 temporarily, update and change it back

Wednesday, June 15, 2016

Clone SD Card Image (Mac)

I've started using Raspberry Pie. Backing up the SD Card image and restore is a quick way to test things out.

First check which disk the SD card is using

diskutil list

then copy raw format of the card to image file while at the same time compress it to save some space

sudo dd if=/dev/rdisk2 bs=1m | gzip > ~/Desktop/pi.gz

To restore image to SD, first unmount the card by

diskutil unmountDisk /dev/disk2


gzip -dc ~/Desktop/pi.gz | sudo dd of=/dev/rdisk2 bs=1m

this could take a while

(to eject disk)
diskutil eject /dev/disk2

Friday, May 13, 2016

Quick firewall setting for Ubuntu/Wordpress

To show current firewall rules, use
iptables -L
If it's empty, below are the steps to quickly add firewall rules, assuming you want to run a simple wordpress site (only allow loopback, ssh, http, https and drop the rest).
sudo iptables -I INPUT 1 -i lo -j ACCEPT
sudo iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
sudo iptables -A INPUT -p tcp --dport ssh -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 443 -j ACCEPT
sudo iptables -A INPUT -j DROP
Then save it to file to apply at reboot:
sudo sh -c "iptables-save > /etc/iptables.rules"
Create a script /etc/network/if-pre-up.d/iptablesload with content below:
iptables-restore < /etc/iptables.rules
exit 0
and a script /etc/network/if-post-down.d/iptablessave with content below:
iptables-save -c > /etc/iptables.rules
if [ -f /etc/iptables.downrules ]; then
       iptables-restore < /etc/iptables.downrules
exit 0
Don't forget to 
sudo chmod +x /etc/network/if-post-down.d/iptablessave
sudo chmod +x /etc/network/if-pre-up.d/iptablesload
****note if you want to allow ftp then add these to iptables rules
sudo iptables -I INPUT -p tcp --dport 21 -j ACCEPT
sudo iptables -I OUTPUT -p tcp --sport 20 -j ACCEPT

and you have to change pam_service_name=vsftpd to pam_service_name=ftp near the end of your /etc/vsftpd.conf file

Wednesday, April 27, 2016

Increase Swap size - digitalocean droplet

Set the swap size to 512M and after a while mysql failed to start. Tail the /var/log/mysql/error.log and found that innodb had memory-related error. For now I solved it by increasing the swapfile size.

1. Cannot swapoff since there was not enough memory
2. So I create new swapfile first and use it and then delete the old one and edit the /etc/fstab file

sudo fallocate -l 4G /swapfilenew
sudo mkswap /swapfilenew
sudo swapon /swapfilenew
sudo swapoff /swapfile # < delete old swap
sudo rm /swapfile
sudo swapon -s # check to make sure

Edit /etc/fstab to turn on swap when reboot. Change from /swapfile to /swapfilenew

Friday, April 22, 2016

ซ่อมปุ่มกดพัดลม hatari บอร์ด ht7621

อาการคือกดแล้วไฟไม่ติดและไม่มีเสียงอะไรเลย ตอนแรกคิดว่าเป็นที่ C 105K/400V เหมือนที่หลายๆท่านว่ากัน แต่ดูแล้วมอเตอร์มันไม่ได้ขยับหรือมีเสียงอะไรเลย จึงคิดว่าน่าจะเป็นที่สวิทช์เสีย ลองค้นดูเจอเวปนี้ http://repairsmcu.blogspot.com/2015/06/hatarihc-s16d3-10.html ลองทำดูแล้วได้ผล ต้องขอขอบคุณมากเลยครับ ที่ให้ความรู้ในการซ่อมสวิทช์ ที่ผมทำคือใช้สเปรย์ phillips ฝาสีแดงฉีดที่สวิทช์แล้วกด 100 ครั้ง ทำซ้ำกันสามครั้ง หายจริงเหมือนที่ได้แนะนำไว้

Sunday, March 6, 2016

Fix Missing Boot File problem on Windows 10

I had problem with Boot Manager after installing Windows 10. Running "bcdedit" I could see that the partition on Windows Boot Manager was wrong. I then used EasyBCD to fix
  1. From BCD Backup/Repair, select re-create/repair boot files
  2. Perform Action
  3. Restart

Remove Earlier Version of Windows Menu When Boot

  1. Run Command Line with Admin
  2. Run bcdedit to check previous version entry
  3. bcdedit /delete {identifier of Windows Legacy OS Loader} /f
You can also use EasyBCD Free tool.