HowTo: Flashing NodeMCU Firmware to ESP8266

esptool.py, nodemcu, ubuntu, debian

NodeMCU Firmware# From time to time, you should take a look into the official NodeMCU Firmware repository. It is under heavy development and new modules and features are added constantly. Since version 0.9.6, there are no binary releases available, because the large amount of available module will not fit into the flash. Instead, you can […]

Firmware Update of IBM ServeRaid BR10i with Ubuntu

system x, x3550 m3, LSI SAS 1068E, ibm 7944

I have just got a used IBM x3550 M3 server as development machine and ran into some trouble when trying to add some SSDs: the throughput was pretty slow (~100MB/s). Generally the BR10i controller supports 3G SATA2 and therefore i expected a throughput of ~250MB. I’ve figured out, that this behaviour is caused by the firmware […]

Howto: (re-)Enable SCP/SSH Login on Synology DSM 6.0 for non admin users [UPDATE]

a update which may break your backup tasks! change the user shell permanently

When updating to the latest DSM 6.0 final, you may have noticed that your scp backup accounts won’t work anymore (this also affects ssh the login). It is caused by a reset of the login shell settings in /etc/passwd ! It is happened in part of a “security enhancement” – normal users, which does not […]

Tweaking Minidlna Media Server on AsusWRT Merlin

usb storage, disable album arts, performance

You’re running AsusWRT Merlin and have some trouble with minidlna, e.g. bad media indexing performance or broken media databases ?

This can be caused by using an USB Stick as media database storage! Internally, minidlna is using an SQLite database to store the media file index – and sometime this database may broke (slow, unsynced file operations, user terminated processes).

As a workaround, it’s possible to move the media database to the temporary filesystem (ramdisk). As a disadvantage, on every system shutdown (reboot/power cycle) the database will be destroyed. But it only takes a view minutes to recreate it, because the ramdisk storage is a lot faster than the attached USB drive!

Just create an additional user config file in your JFFS /jffs/configs/minidlna.conf.add (will be automatically appended to the system generated minidlna.conf file!)

# Move the database to the tmp directory (ramdisk, will be recreated on reboot !!)
db_dir=/tmp/.minidlna

# create a custom minidlna logfile
log_dir=/var/log

# disable album art indexing
album_art_names=NO_ALBUM_ARTS.x

 

Ubuntu 15.10 with Dell Wireless 5570 HSPA+ (42Mbps) Mobile Broadband Card

mbmi to qmi modeswitch, magical ffc-auth sequence

A several days ago, i’ve replaced the Gobi 2000 WWAN Card with a newer version, a Dell 5570 Module. It’s a branded Sierra Wireless card, so i hoped it will work out of the box on Ubuntu 15.10 – but nothing. After some investigations if figured out, that the card is locked in “low-power” / […]

Ubuntu 15.10 – Disable Wake on LAN (WOL) permanently

ubuntu, systemd, Wily Werewolf, notebook, battery power drain

Preface# In some cases, Wake on LAN is enabled by default and you cannot disable it in your BIOS/UEFI because the setting is not available. On notebooks/ultrabooks, WOL can drain/discharge your battery even your device is powered-off! There are a several guides out there, which didn’t even work. The general mistake is, that the WOL […]

PHP-FPM “Access Denied” on .phtml Files

a problem which took about 1h of research..

Some Weeks ago, i switched most of the webserver setups from custom spawn-fcgi init scritps to php-fpm and everything seems to work fine until today. The php-version of GitHubButtons won’t work anymore – just a text-message appears: “Access Denied.” First of all i thougt it was a problem with lighttpd and the fastcgi.map-extensions directive, but the error message doesn’t seem to be served by lighttpd…and well…it was a php-fpm related issue, beacause php-fpm only processes .php files by default!

You will not find these directive in the official FPM Documentation on php.net – it’s missing including tons of other directives. To get an overview about all possible php-fpm config keys, you should take a look into to default php-fpm.conf file included into the php-sources (sapi/fpm/php-fpm.conf) – also attached to this post!

Important: This directive can’t be used in global context, it’s a pool based config key!

Examle Pool: php-fpm.conf#

[pool-testwww]
; Limits the extensions of the main script FPM will allow to parse. This can
; prevent configuration mistakes on the web server side. You should only limit
; FPM to .php extensions to prevent malicious users to use other extensions to
; exectute php code.
; Note: set an empty value to allow all extensions.
; Default Value: .php
; Recommended: .php .phtml
security.limit_extensions = .php .php3 .php4 .php5 .phtml